Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T6074-92
Preparation, Cleaning and Evaluation of Corrosion Samples
Published on May 5, 1992
Implementation of the Ministry of Machinery and Electronics Industry of the People's Republic of China on July 1, 1993
Mechanical Industry Standard of the People's Republic of China
Preparation, Cleaning and Evaluation of Corrosion Samples
1 Subject Content and Scope of Application
JB/T6074-92
This standard specifies the preparation of metal samples for corrosion tests, the removal of corrosion products and the evaluation methods of corrosion losses. This standard is applicable to various corrosion tests under laboratory conditions, and can also be applied to the preparation, cleaning and evaluation of various corrosion test samples under natural environment conditions.
2 Samples
2.1 Sampling
2.1.1 Samples can be taken directly from the product or from the same batch of raw materials used to manufacture the product. 2.1.2 This standard does not include the sampling of the whole product. 2.2 The shape and size of the test specimen
2.2.1 The shape and size of the test specimen shall be determined by the test purpose, material properties and the container used. The test specimen with a large ratio of surface area to mass and a small ratio of edge area to total area shall be used as much as possible. 2.2.2 The total surface area of each test specimen shall not be less than 10cm2. Two shapes of test specimens are recommended, and their specifications are as follows: Plate test specimen: 1×b×h, cm: 5.00×2.50×(0.20~0.30) 3.00×1.50×(0.15~0.30)
Circular test specimen: medium×h, cm: 3.80×(0.20~0.30) 3.00×(0.20~0.30)
The shape and specifications of the test specimens in the same batch shall be the same. At least 3 parallel test specimens shall be taken for each test. 2.3 Adjustment of sample surface condition
The sample surface used in the corrosion test should simulate the surface condition of the product as much as possible. Steps for adjusting the sample surface condition
Grind with metallographic sandpaper or diamond paste to remove burrs on the edge and surface of the sample. Degrease the sample in acetone, alcohol or hot alkaline cleaning agent. When there is an oxide film or rust on the surface of the sample, it is generally cleaned by the chemical method in Article 3.2. After thoroughly cleaning the sample with water, put it in anhydrous alcohol. d.
Dry.
2.4 Adjustment of sample metallurgical condition
The metallurgical condition of the sample should not be changed during the preparation of the sample. If there is a change, it should be corrected by subsequent heat treatment, machining or other methods.
2.5 Measurement and weighing of the sample
The measurement and weighing of the sample must be carried out after cleaning and drying. The size is accurate to 0.01cm*, and the mass is accurate to 0.001g. 3 Methods for removing corrosion products after the sample test 3.1 Electrolytic cleaning method
3.1.1 After wiping off the loose corrosion products on the surface of the sample, immerse the sample in the electrolyte for electrolysis. Approved by the Ministry of Machinery and Electronics Industry on May 5, 1992 and implemented on July 1, 1993
3.1.2 Electrolyte formula and process
Sulfuric acid (H2SO
Organic corrosion inhibitor"
Distilled water
Current density
Density 1.84)
JB/T6074-92
1000mL
Graphite or lead\
20A/dm
Note: 1) 0.5g/L di-o-toluene thiourea or hexamethylenetetramine can be used as corrosion inhibitor. 2) When using lead as anode, lead may be precipitated on the sample, causing mass loss error. If the sample is resistant to nitric acid, the lead in the sample can be removed by briefly immersing the sample in 1:1 nitric acid. Although lead deposition may cause mass loss error, it is still used as anode material because its corrosion products are easy to remove. 3.2 Chemical cleaning method
According to Different materials use the solution formula and process shown in Table 1. Table 1
Metal materials
Stainless steel
Aluminum and aluminum alloys
Copper, nickel and their alloys
Tin and tin alloys
Magnesium and magnesium alloys
Zinc and zinc alloys
Cleaning method
Solution composition
①20% sodium hydroxide, 200g/L zinc powder
④Hydrochloric acid (HCl density 1.19) 1 000mL, antimony oxide (Sb:0s) 20g, tin fluoride (SnC1:) 50g ③ sulfuric acid (H2SO4.density 1.84) 100mL, organic corrosion inhibitor 1.5mL, steamed filling water 1000mL
alternately impregnate 9
① nitric acid (HNO3.density 1.42) 100mL, steamed filling water 1000mL
② ammonium citrate 150g, distilled water 1000mL
impregnate ① chromic anhydride (Cr ②Nitric acid (HNO, density 1.42)
Hydrochloric acid (HCl, density 1.19) 500mL, distilled water
1000mL
Sodium phosphate (Na:PO.) 150g, distilled water 1000ml
Chromic anhydride (CrO), 150g silver chromate (Ag:CrO) 10 g, steamed stuffing water 1000mL
alternately immerse ① acetic acid (99.5%) 10mL, distilled water 1000mL ② ammonium acetate 50g, distilled water 1000mL
saturated ammonium acetate (CH:COONH)
alternately immerse ① ammonium hydroxide (NH,OH density 0.90) 150mL, distilled water 1000mL
② chromic anhydride (Cr0:) 50g, nitric acid
silver (AgNO, ）10g, distilled water 1000mL Treatment conditions
Temperature ℃
Time min
Until clean
Until clean
Note safety
The solution must be stirred vigorously, or use
rubber, wooden tools to scrub the sample
Organic corrosion inhibitor is hexamethylene
tetramine or thiourea
Method ① in steel can also be used
If there is still a layer of film, immerse it in ②| |tt||Wash for 1min
Most of the corrosion products should be removed before treatment
It is best to use electrolytic cleaning method
Chromic anhydride is not allowed to contain sulfate. In the preparation, silver nitrate is dissolved and then added to boiling chromic acid
3.3 Mechanical cleaning method
JB/T607492
This method can be used to replace or supplement the chemical cleaning method to remove attached sediments. A soft scraper or fiber bristle brush should be used to avoid damaging the sample matrix.
3.4 The samples cleaned by the above methods should be cleaned in running water and gently scrubbed with a brush. If necessary, they can be repeatedly cleaned and soaked. The cleaned samples are placed in anhydrous alcohol, taken out and dried, and placed in a dry coal dryer to cool to air temperature before weighing. 4 Evaluation of Corrosion Damage
4.1 Calculation of Corrosion Rate
4.1.1 Regardless of the cleaning method used, there is a possibility of damaging the base metal, which causes errors in the corrosion rate measurement. In order to correct this, one or more cleaned and weighed samples can be used. Re-clean and weigh using the same method, and the corrected mass loss value is calculated according to formula (1).
W=(W,- W2)-(W,-Ws)
Wherein: AW-corrected mass loss value, g; W, —-mass of the sample before corrosion test, g; W-mass of the sample after corrosion test and removal of corrosion products, g; W,-mass of the sample after re-cleaning, g
For more accurate correction methods, see Appendix A (Supplement). 4.1.2 Calculate the average corrosion rate or the corrected corrosion rate according to formulas (2) and (3). K(WW)
R=K(W.-2Wa+W.)
Wherein: \-corrosion rate;
R-corrected corrosion rate;
K constant (see 4.1.3);
W, mass of the sample before corrosion test, g, accurate to 0.001g; Wr
-mass of the sample after removing corrosion products, g, accurate to 0.001g; W,-mass of the sample after re-cleaning, g, accurate to 0.001g; S--surface area of the sample, cm2, accurate to 0.01cm2; T corrosion test time, h, accurate to 0.01h; D density, g/cm
4.1.3T, S, W, D are based on 4.1.2, the corrosion rate can be expressed in multiple units using the appropriate K value below. Corrosion rate unit
mm/a (millimeter/year)
(m/a (micrometer/year)
pm/s (picometer/second)
g/(mh) gram/(meter hour)
mg/(dmd) [milligram/(decimeter2.day)
μg/(ms) microgram/(meter2second)]
8.76×107
2.78×106
1.00×10*×D
2.40×10°×D
2.73×10×D
· (3)
4.1.4 In 4.1.3, when calculating the corrosion rate in the last three units, there is no need to find the material density D value. The density of the constant K is exactly the same as the D low pin in the corrosion rate formula.
4.1.5 If necessary, these constants can also be used to convert the corrosion rate from one unit to another. In order to convert a corrosion rate in one unit to a corrosion rate in another unit, you can multiply it by K,/K for conversion. For example: 3
JB/T6074—92
2.78×106
1mm/a =1x-
8.76×104
When pitting corrosion exists, the corrosion rate calculated from the mass loss will have errors, and the corresponding pitting corrosion assessment method can be selected. 4.2
4.3 Other methods for assessing corrosion damage
4.3.1 Appearance Assess the change in appearance through rust, discoloration or oxidation. Mechanical properties If the cross-sectional area of the specimen (measured value before the corrosion test) is reduced due to extensive corrosion, it will cause a decrease in tensile strength. 4.3.2
Local corrosion (such as cracking) can also cause a decrease in tensile strength and elongation. 4.3.3 Electrical Performance cracking and pitting can cause a decrease in apparent conductivity. Metallographic examination Separation, peeling, cracking or intergranular corrosion can be evaluated by preparing metallographic specimens of the surface. 4.3.4
5 Report
The report should include the sample composition, size, metallurgical conditions, surface preparation and cleaning method of corrosion products after the test, as well as the evaluation results of corrosion damage.
JB/T607492
Appendix A
Method for accurate determination of mass loss
(Supplement)
A1 Repeat the cleaning several times, weigh and plot after each cleaning The relationship curve between mass loss and total cleaning time or number of cleanings. See Figure A1. The vertical bar at the inflection point of the curve is the mass loss caused only by the removal of corrosion products. This method is particularly suitable for electrolytic cleaning. Mass of corrosion products removed
Removed substrate
Removed corrosion products
Cleaning time
Additional notes:
Relationship between mass loss and cleaning time during cleaning This standard was proposed and coordinated by the Wuhan Materials Protection Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Wuhan Materials Protection Research Institute. The main drafters of this standard are Yu Hongying and Fang Yisan. Machinery Industry Standard of the People's Republic of China
Preparation, Cleaning and Evaluation of Corrosion Test Specimens
JB/T 6074—92
Published and distributed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (PO Box 8144, Beijing 100081)
Copyright reserved
No reproduction allowed
Format 880×12301/16
Printing sheet 1/2
Word count 10,000
First edition in September 1992
First printing in September 1992
Print run 00,001—700
Price 1.20 yuan
Serial number 0637||tt ||Standard of the Machinery Industry of the People's Republic of China
JB/T6075—92
Titanium Nitride Coating
Published on May 5, 1992
Metallographic Inspection Method
Implementation on July 1, 1993
Published by the Ministry of Machinery and Electronics Industry of the People's Republic of China
Standard of the Machinery Industry of the People's Republic of China
Titanium Nitride Coating
Subject Content and Scope of Application
Metallographic Inspection Method
JB/T6075—92
This standard specifies the metallographic inspection method of titanium nitride coating. This standard is applicable to the inspection of the metallographic structure, thickness and hardness of physical vapor deposition titanium nitride coating on high-speed steel. This standard is also applicable to the inspection of the metallographic structure and thickness of titanium nitride coating on other substrate materials (carbon steel, high alloy steel, cemented carbide, stainless steel, copper, etc.).
2 Reference standards
GB9451
GB9790
JB/T5069
EB6462
3 Sample preparation
Determination of the total hardened layer depth or effective hardened layer depth on thin surfaces of steel parts Metallic coatings and other related coatings Vickers and Knoop microhardness test methods for metallographic inspection of infiltrated metal layers of steel parts Microscopic measurement of the thickness of metal and oxide coatings in cross sections According to the provisions of Chapter 4 of JB/T5069.
3.1 Sampling
3.1.1 Take samples from representative parts of the product. For non-flat surface coatings, chrome or nickel plating is required before inlaying and the cross section cut during inlaying should be perpendicular to the coating to be tested. 3.1.2 Substitute test specimens
3.1.2.1 Substitute test specimens with the same material, same process and same heat as the product, recommended size is 10mm×4mm×20mm10mm)3.1.2.2 Two or more substitute test specimens are separated by nickel sheets and clamped for sample preparation. 3.1.3 Oblique section test specimens
According to Article 3.1.1 of GB9451.
3.2 Grinding and polishing of samples
3.2.1 Clamp (embed) the sample and lightly grind it with grinding wheel, pre-grinding disc and sandpaper in turn. The grinding direction is about 45° with the coating. Rotate the sample 90° each time you change the sandpaper
3.2.2 Polish with polishing powder or W10, W5 diamond polishing paste first, then clean and polish with water 4 Coating structure inspection
4.1 Before etching the sample, magnify 800~1000 times to check the uniformity, continuity and matrix bonding of the coating, pores and loose structure. 4.2 Etch with 3% nitric acid alcohol solution to show the matrix structure. 4.3 Use coating etchant to show the coating microstructure. The etchant is composed of: HO2 as the base, add appropriate amount of complexing agent and corrosion inhibitor, and adjust the pH value to 9~10 with NaoH10% aqueous solution, and use it as soon as it is prepared.
Etching parameters are shown in the table below
Approved by the Ministry of Machinery and Electronics Industry on May 5, 1992 and implemented on July 1, 1993
Temperature ℃
JB/T6075-92
20～25
Use the two reagents in 4.2 and 4.3 to etch the specimens successively. When available, the matrix and coating structures can be displayed. The structures of high-speed steel coating specimens displayed by different etchants are shown in Figures 1, 2 and 3. Figure 1 shows the matrix structure
Etching agent 3% nitric acid alcohol solution
Magnification 1000
Figure 2 shows the coating structure
Etching agent coating etchant
Magnification 1000
JB/T607592
Showing the matrix and coating at the same time Organization
Etchant 3% nitric acid alcohol solution + coating etchantMagnification 1000
4.6 The coating electron scanning image is still a columnar product. Phase composition line scanning and coating structure analysis The coating is TiN and Ti.N, see Figure 4 and Figure 5A
4 Coating electron scanning
Magnification
Accelerating voltage
5 Coating thickness measurement
Use 3% nitric acid alcohol solution etchant
Magnification
Accelerating voltage
Detected X-ray spectrum
Probe current
Coating composition line scanning
Ti-Lα
1×10-6A
2.5×106A
The cross-section sample is measured according to GB6462. Magnified 800 to 1000 times under a microscope, the coating thickness is 5.1
5 from the surface to the substrate boundary.2 Oblique cross-section specimens, magnified 500 to 1000 times under a microscope, the extended coating thickness from the surface to the substrate boundary is calculated according to the following formula in GB9451.
e=Lsinα
Where: e—coating thickness·um;
L—extended coating thickness, μm;
α——module angle 5°~15°
JB/T6075—92
The coating thickness is measured at 3 to 5 points in the same field of view and the arithmetic average is taken. 5.4 Measure the coating thickness (micrometers) and read to one decimal place. The wear-resistant coating thickness is ≥1.5μm, and the decorative coating is 0.5μm. 5.5
Determination of coating hardness
Determine the hardness on the coating surface, and the operation method is carried out according to GB9790. The surface roughness Ra of the sample is 0.32μm.
The sample needs to be specially coated, and the coating thickness is ≥5μum. The test force is 0.147~0.245N.
Wear-resistant coating thickness 1800HV
Test report
Titanium nitride coating report should include the following contents: coating equipment, substrate material and process parameters: a.
Coating structure and defects;
Coating uniformity and thickness (the test surface must be indicated); c.
Coating hardness;
e. Others.
Additional instructions:
This standard was proposed and managed by the Wuhan Materials Protection Research Institute of the Ministry of Machinery and Electronics Industry. This standard was drafted by the Wuhan Materials Protection Research Institute and Shanghai Tool Factory. The main drafters of this standard are Li Ruiju, Yi Renquan and Jin Dayi. A1 Test purpose
JB/T607392
Appendix A
Planned intermittent corrosion test method
(reference)
To examine the effect of test time on solution corrosivity and metal corrosion rate, and to select the best test cycle based on this. A2 Test method
Take four groups of specimens, with at least 2 pieces in each group. All four groups of specimens should be placed in the medium of the same container for testing. If the container is not large enough, one piece of specimen can be taken from each group and placed in one container for testing, or several containers can be used for parallel testing under the same conditions. A2.2 The test time of the four groups of samples is arranged as shown below: Group
Sample port Group
AIV Group
Test time
Groups I, II, and III start the test at the same time; Group I is a full-time test (test time is t+α), Group II is a long-term test (test time is t), and Group III is a short-term test (test time is α). When the test reaches t, the group V sample is placed in the above solution to start the test, and the test time is b (b=a).
A2.3 All tests are carried out in accordance with this standard, and the corrosion losses (weight loss per unit area) of the four groups of samples are used as the basis for evaluation. A2.4 Evaluation
Let Rt+a, Rt, Ra, and Rb. be the corrosion losses of the four groups of samples I, II, III, and IV, respectively, and R. =R++a-Rto. The situation during the test is judged according to Table A1 and Table A2. Table A1
Judgment of the situation during the corrosion test
Corrosiveness of the solution
Metal corrosion rate
No change
No change
People's Republic of China
Mechanical industry standard
Titanium amide coating
Metallographic inspection method
JB/T6075-92
Published by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry Printed by the Mechanical Standardization Research Institute of the Ministry of Machinery and Electronics Industry (P.O. Box 8144, Beijing 100081)
Copyright
No reproduction
Format 880×12301/16 Sheet 1/2
8000
First edition September 1992 First printing September 1992 Printing 00,001-700 Price 1.20 yuan
No. 0638
Standard of the Machinery Industry of the People's Republic of China
JB/T6076-92
Guide to the Selection of Vibration Tables
Issued in 992~35-05
Implementation of the Ministry of Machinery and Electronics Industry of the People's Republic of China in 1993-1
Standard of the Machinery Industry of the People's Republic of China
Guide to the Selection of Vibration Tables
Subject content and scope of application
This standard specifies the selection method and basic requirements of the main types of vibration tables. This standard is applicable to users who choose vibration tables according to test requirements. 2 Reference standards
GB2298
GB7670
GB10179
GB/T11353
JJG189
JJG190
JJG638
Terms for mechanical vibration and impact
Method for describing the characteristics of electric vibration test equipmentMethod for describing the characteristics of hydraulic servo vibration test equipmentMethod for describing the characteristics of vibration generator auxiliary tableTrial verification procedure for mechanical vibration test benchTrial verification procedure for electric vibration test bench systemNational metrological verification procedure for hydraulic vibration test benchMain types and basic parameters of vibration tables
J8/T607692
A machine used to generate vibration and transmit it to other structures or equipment is called a vibration generator. A system consisting of a vibration generator and necessary auxiliary equipment is called a vibration generator system, also known as a vibration table. 3.1 Main types of vibration tables
Based on the different principles and structures, the main types of vibration tables include mechanical vibration tables, electric vibration tables, hydraulic vibration tables, electromagnetic vibration tables, piezoelectric vibration tables, magnetostrictive vibration tables and resonance vibration tables. Mechanical vibration tables, electric vibration tables and hydraulic vibration tables are often used. 3.1.1 Mechanical vibration tables
A vibration table with a mechanical vibration generator is called a mechanical vibration table. There are two main types of mechanical vibration tables: direct drive vibration tables and reaction vibration tables.
3.1.1.1 Direct drive vibration tables
A direct drive vibration table is a vibration table directly driven by a transmission mechanism such as a connecting rod or a cam, and its displacement amplitude generally does not change with load and frequency. According to the different driving parts, it can be divided into crank-connecting rod type (see Figure 1), yoke type (see Figure 2) and cam type (see Figure 3). Table
Figure 1 Crank-connecting rod type mechanical vibration table
Approved by the Ministry of Machinery and Electronics Industry on 1992-05-05Figure 2 Yoke type mechanical vibration table
Implementation on 1993+07~01
JB/T6076-92
Figure 3 Cam type mechanical vibration table
3.1.1.2 Reaction type vibration table
A reaction type vibration table is a vibration table that generates exciting force by the rotation or reciprocating motion of an unbalanced mass (see Figure 4). Figure 4
Reaction type vibration table
3.1.2 Electric vibration table
A vibration generator driven by the excitation force generated by the interaction between a fixed magnetic field and a movable coil located in the magnetic field and passing a certain alternating current is called an electric perturbation generator. Its typical structure is shown in Figure 4 and its block diagram is shown in Figure 7.
A vibration table with an electric perturbation generator is called an electric vibration table. 8
Figure 5 Electric perturbation generator with a workbench Typical structure of the generator 1 frame; 2 workbench: 3-moving diagram: 4 mounting bolt sleeve 5 suspension and guide of moving parts: 6 limit brake: 7-elastic seal; 8 external rate; 9-demagnetization line diagram; 10 external pole piece; 11-center pole piece; 12 platform shell; 13 excitation line kitchen; 14 ear shaft; 15 support row; 16 dismantling generator total suspension; 17 core locking device; 18 vibration generator directional device; 19 seat Note: Moving parts include frame, workbench and moving diagram. 2
JB/T6076—92
Force output excitation
Figure 6 Typical structure of electric vibration generator with force output excitation head
Signal generation
and detection device
Amplifier
Figure 7 Block diagram of electric vibration table
Electric vibration
Generator
Cooling system
3.1.3 Hydraulic vibration table
A vibration generator that uses liquid pressure as the excitation force is called a hydraulic vibration generator (see Figure 8). A vibration table with a hydraulic vibration generator is called a hydraulic vibration table, and its block diagram is shown in Figure 910
Hydraulic vibration generator with a workbench
bHydraulic vibration generator with a force output end Figure 8 Hydraulic vibration generator
JB/T6076--92
1 High pressure source; 2-Servo valve; 3 Servo control line network: 4 Adjustable bypass valve: 5-Piston; 6-Piston rod; 7-Workbench body; 8-Workbench surface; 9 Threaded sleeve; 10-Force output end: 1 1- Seal and slip collector; 12- Guide system; 13- Limiter; 14- Hydraulic cylinder; 15- Displacement sensor; 16- Base; 17- Base plate; 18- Foundation or reaction mass Note: ① Moving parts include piston, piston rod, workbench body (or force output end) ③ Hydraulic cylinder and base can be connected by column or ball connection Output auxiliary platform
Signal generation
and detection device
3.2 Basic parameters of vibration table
The basic parameters of the mechanical vibration table are shown in Table 1.
Servo valve control
and protection device
Figure 9 Block diagram of hydraulic vibration table
Table 1 Basic parameters of mechanical vibration table
Maximum load
Frequency range
Basic parameters of electric vibration table are shown in Table 2
Hydraulic vibration
Generator
Hydraulic source system
Basic parameters
Maximum displacement
Maximum acceleration under full load
Positive String stimulation
100000
200000
Shifanguo
5~5000
5~5000
5~5000
5~5000
5~3000
5~2500
5~2000|| tt||5~2000
5~1600
JB/T6076—92
Table 2 Basic parameters of electric immersion table
Maximum displacement
Basic parameters of hydraulic vibration table are shown in Table 3.
Sine excitation force
Frequency range
100000
200000
500000
DC~1000
DC-1000
DC~1000
DC~500
DC~500
DC-100
DC~500
DC~100
Maximum negative line
Basic parameters of hydraulic vibration table
Maximum displacement
Note: ①The gravity of the rated load is generally taken as 1/10~1/20 of the exciting force. This
No load
Maximum acceleration
Rated load
③The sinusoidal exciting force, frequency range and maximum displacement in the table are all data under rated load conditions. Comparison of the main performances of three types of vibration tables Comparison of the main performances of three types of vibration tables Table 1 Working table size
Maximum acceleration under a given load
JB/T6076-92
The common ranges of frequency and amplitude of the three types of vibration tables are shown in Figure 10. Table 4 Comparison of the main performances of three types of vibration tables Type
Maximum thrust
Maximum displacement
Rated frequency range
Waveform type
Waveform distortion
Automatic programming
Control parameters
Anti-eccentric load capability
Control accuracy
Energy-price ratio
Mechanical vibration table
Electric vibration table
Sine, random
Displacement, velocity, acceleration
Good waveform reproduction
Good power spectrum reproduction
High when small thrust
Low when large thrust
Common area of hydraulic alarm table
Common area of electric alarm table
Common area of mechanical alarm table
Comparison of common areas of frequency and amplitude of three types of vibration tables in Figure 10
5 Basic requirements for vibration table in vibration test
The performance indicators of the selected vibration table should be able to meet the requirements of the test specifications. Hydraulic vibration table
is relatively wide. It can start from DC
sine, triangle, rectangle, random
displacement, velocity, acceleration
good random waveform reproduction
good performance spectrum reproduction
low when small thrust
high when large thrust
limit characteristics of sine vibration
the characteristic curve required by the vibration test should be below the limit characteristic curve when the vibration table is in the corresponding specimen mass. The limit characteristics of displacement, velocity and acceleration of the vibration table under different specimen masses are generally given in the form of the limit characteristic curve of sine vibration shown in Figure 11.
5.2 Limit characteristics of random vibration
JB/T607692
Figure 11 Limit characteristic curve of vibration table under sinusoidal conditions 2.1
Frequency Hz
The random characteristic curve in the vibration test specification should be below the limit characteristic curve when the vibration table is at the corresponding specimen mass. The acceleration power spectral density (PSD) limit of the vibration table under different specimen masses, m/g
is generally given in the form of a curve as shown in Figure 12. ff
Figure 12 Harmonic power density curve of vibration table
Estimation of random performance of vibration table and basic parameters of random vibration control system are shown in Appendix A (reference) 5.3 Other requirements
The following vibration table performances shall also meet the requirements of vibration test specifications: static load;
Frequency range:
Anti-eccentric load capability:
Continuous working time;
Total distortion;
Lateral movement of work surface;
9. Acceleration uniformity of work surface;
h. Background noise;
Particle rate stability;
j. Fixed vibration accuracy and maximum sound level of radiated noise 5.4 Auxiliary table
For the perturbation test using auxiliary table, the performance parameters shall be selected according to GB/T11353 and meet the requirements of perturbation test specifications. 6. Requirements for test loads in performance parameter testing and verification of perturbation tables 6.1 Performance parameter testing and verification of mechanical vibration tables shall be carried out in accordance with JJG189. 6.2 Performance parameter testing and verification of electric vibration tables shall be carried out in accordance with JJG190. 6.3 Performance parameter testing and verification of hydraulic vibration tables shall be carried out in accordance with JJG638. 6.4 Requirements for test loads shall be in accordance with the provisions of Appendix C of GB10179, JB/T6076-92
Appendix A
Basic parameters of random performance estimation of vibration table and random alarm control system (reference part)
A1 Random performance estimation of vibration table
A1.1 Random performance verification of electric vibration table A1.1.1 Two transfer characteristics of electric alarm table The frequency response function H() of acceleration to current is: The frequency response function H.() of acceleration to voltage: H()=A()/I()
H.=A()/U()
Where: A() is the Fourier transform of the acceleration a output by the electric vibration table surface; ) is the Fourier transform of the output current i of the power amplifier of the electric vibration table; U() is the Fourier transform of the output voltage u of the power amplifier of the electric vibration table. The above two transfer characteristics vary with the load mass and can be calculated or obtained through experiments. A1.1.2 Current check
G()=G.()/IH()12
Wherein: ff—lower and upper limits of the operating frequency, Hz; Ie
G.(f)--acceleration power spectrum density function, G*/Hz; G.()—current power spectrum density function, G*/Hz; Iar—random current peak value, A;
—sinusoidal current peak value, A.
In this appendix, the first subscript S represents the sinusoidal condition and R represents the random condition; the second subscript R represents the root mean square value and P represents the bee value. In general, for any random variable Y that satisfies the normal distribution, we have: Yp=3Yu
Voltage check
G.()=G.()/ IH() 1 2
Acceleration check
Speed check
G(dfy/
Uup2 Basic parameters of vibration table
Basic parameters of mechanical vibration table are shown in Table 1.
Servo valve control
and protection device
Figure 9 Block diagram of hydraulic vibration table
Table 1 Basic parameters of mechanical vibration table
Maximum load
Frequency range
Basic parameters of electric vibration table are shown in Table 2
Hydraulic vibration
Generator
Hydraulic source system
Basic parameters
Maximum displacement
Maximum acceleration under full load
Positive String stimulation
100000
200000
Shifanguo
5~5000
5~5000
5~5000
5~5000
5~3000
5~2500
5~2000|| tt||5~2000
5~1600
JB/T6076—92
Table 2 Basic parameters of electric immersion table
Maximum displacement
Basic parameters of hydraulic vibration table are shown in Table 3.
Sine excitation force
Frequency range
100000
200000
500000
DC~1000
DC-1000
DC~1000
DC~500
DC~500
DC-100www.bzxz.net
DC~500
DC~100
Maximum negative line
Basic parameters of hydraulic vibration table
Maximum displacement
Note: ①The gravity of the rated load is generally taken as 1/10~1/20 of the exciting force. This
No load
Maximum acceleration
Rated load
③The sinusoidal exciting force, frequency range and maximum displacement in the table are all data under rated load conditions. Comparison of the main performances of three types of vibration tables Comparison of the main performances of three types of vibration tables Table 1 Working table size
Maximum acceleration under a given load
JB/T6076-92
The common ranges of frequency and amplitude of the three types of vibration tables are shown in Figure 10. Table 4 Comparison of the main performances of three types of vibration tables Type
Maximum thrust
Maximum displacement
Rated frequency range
Waveform type
Waveform distortion
Automatic programming
Control parameters
Anti-eccentric load capability
Control accuracy
Energy-price ratio
Mechanical vibration table
Electric vibration table
Sine, random
Displacement, velocity, acceleration
Good waveform reproduction
Good power spectrum reproduction
High when small thrust
Low when large thrust
Common area of hydraulic alarm table
Common area of electric alarm table
Common area of mechanical alarm table
Comparison of common areas of frequency and amplitude of three types of vibration tables in Figure 10
5 Basic requirements for vibration table in vibration test
The performance indicators of the selected vibration table should be able to meet the requirements of the test specifications. Hydraulic vibration table
is relatively wide. It can start from DC
sine, triangle, rectangle, random
displacement, velocity, acceleration
good random waveform reproduction
good performance spectrum reproduction
low when small thrust
high when large thrust
limit characteristics of sine vibration
the characteristic curve required by the vibration test should be below the limit characteristic curve when the vibration table is in the corresponding specimen mass. The limit characteristics of displacement, velocity and acceleration of the vibration table under different specimen masses are generally given in the form of the limit characteristic curve of sine vibration shown in Figure 11.
5.2 Limit characteristics of random vibration
JB/T607692
Figure 11 Limit characteristic curve of vibration table under sinusoidal conditions 2.1
Frequency Hz
The random characteristic curve in the vibration test specification should be below the limit characteristic curve when the vibration table is at the corresponding specimen mass. The acceleration power spectral density (PSD) limit of the vibration table under different specimen masses, m/g
is generally given in the form of a curve as shown in Figure 12. ff
Figure 12 Harmonic power density curve of vibration table
Estimation of random performance of vibration table and basic parameters of random vibration control system are shown in Appendix A (reference) 5.3 Other requirements
The following vibration table performances shall also meet the requirements of vibration test specifications: static load;
Frequency range:
Anti-eccentric load capability:
Continuous working time;
Total distortion;
Lateral movement of work surface;
9. Acceleration uniformity of work surface;
h. Background noise;
Particle rate stability;
j. Fixed vibration accuracy and maximum sound level of radiated noise 5.4 Auxiliary table
For the perturbation test using auxiliary table, the performance parameters shall be selected according to GB/T11353 and meet the requirements of perturbation test specifications. 6. Requirements for test loads in performance parameter testing and verification of perturbation tables 6.1 Performance parameter testing and verification of mechanical vibration tables shall be carried out in accordance with JJG189. 6.2 Performance parameter testing and verification of electric vibration tables shall be carried out in accordance with JJG190. 6.3 Performance parameter testing and verification of hydraulic vibration tables shall be carried out in accordance with JJG638. 6.4 Requirements for test loads shall be in accordance with the provisions of Appendix C of GB10179, JB/T6076-92
Appendix A
Basic parameters of random performance estimation of vibration table and random alarm control system (reference part)
A1 Random performance estimation of vibration table
A1.1 Random performance verification of electric vibration table A1.1.1 Two transfer characteristics of electric alarm table The frequency response function H() of acceleration to current is: The frequency response function H.() of acceleration to voltage: H()=A()/I()
H.=A()/U()
Where: A() is the Fourier transform of the acceleration a output by the electric vibration table surface; ) is the Fourier transform of the output current i of the power amplifier of the electric vibration table; U() is the Fourier transform of the output voltage u of the power amplifier of the electric vibration table. The above two transfer characteristics vary with the load mass and can be calculated or obtained through experiments. A1.1.2 Current check
G()=G.()/IH()12
Wherein: ff—lower and upper limits of the operating frequency, Hz; Ie
G.(f)--acceleration power spectrum density function, G*/Hz; G.()—current power spectrum density function, G*/Hz; Iar—random current peak value, A;
—sinusoidal current peak value, A.
In this appendix, the first subscript S represents the sinusoidal condition and R represents the random condition; the second subscript R represents the root mean square value and P represents the bee value. In general, for any random variable Y that satisfies the normal distribution, we have: Yp=3Yu
Voltage check
G.()=G.()/ IH() 1 2
Acceleration check
Speed check
G(dfy/
Uup2 Basic parameters of vibration table
Basic parameters of mechanical vibration table are shown in Table 1.
Servo valve control
and protection device
Figure 9 Block diagram of hydraulic vibration table
Table 1 Basic parameters of mechanical vibration table
Maximum load
Frequency range
Basic parameters of electric vibration table are shown in Table 2
Hydraulic vibration
Generator
Hydraulic source system
Basic parameters
Maximum displacement
Maximum acceleration under full load
Positive String stimulation
100000
200000
Shifanguo
5~5000
5~5000
5~5000
5~5000
5~3000
5~2500
5~2000|| tt||5~2000
5~1600
JB/T6076—92
Table 2 Basic parameters of electric immersion table
Maximum displacement
Basic parameters of hydraulic vibration table are shown in Table 3.
Sine excitation force
Frequency range
100000
200000
500000
DC~1000
DC-1000
DC~1000
DC~500
DC~500
DC-100
DC~500
DC~100
Maximum negative line
Basic parameters of hydraulic vibration table
Maximum displacement
Note: ①The gravity of the rated load is generally taken as 1/10~1/20 of the exciting force. This
No load
Maximum acceleration
Rated load
③The sinusoidal exciting force, frequency range and maximum displacement in the table are all data under rated load conditions. Comparison of the main performances of three types of vibration tables Comparison of the main performances of three types of vibration tables Table 1 Working table size
Maximum acceleration under a given load
JB/T6076-92
The common ranges of frequency and amplitude of the three types of vibration tables are shown in Figure 10. Table 4 Comparison of the main performances of three types of vibration tables Type
Maximum thrust
Maximum displacement
Rated frequency range
Waveform type
Waveform distortion
Automatic programming
Control parameters
Anti-eccentric load capability
Control accuracy
Energy-price ratio
Mechanical vibration table
Electric vibration table
Sine, random
Displacement, velocity, acceleration
Good waveform reproduction
Good power spectrum reproduction
High when small thrust
Low when large thrust
Common area of hydraulic alarm table
Common area of electric alarm table
Common area of mechanical alarm table
Comparison of common areas of frequency and amplitude of three types of vibration tables in Figure 10
5 Basic requirements for vibration table in vibration test
The performance indicators of the selected vibration table should be able to meet the requirements of the test specifications. Hydraulic vibration table
is relatively wide. It can start from DC
sine, triangle, rectangle, random
displacement, velocity, acceleration
good random waveform reproduction
good performance spectrum reproduction
low when small thrust
high when large thrust
limit characteristics of sine vibration
the characteristic curve required by the vibration test should be below the limit characteristic curve when the vibration table is in the corresponding specimen mass. The limit characteristics of displacement, velocity and acceleration of the vibration table under different specimen masses are generally given in the form of the limit characteristic curve of sine vibration shown in Figure 11.
5.2 Limit characteristics of random vibration
JB/T607692
Figure 11 Limit characteristic curve of vibration table under sinusoidal conditions 2.1
Frequency Hz
The random characteristic curve in the vibration test specification should be below the limit characteristic curve when the vibration table is at the corresponding specimen mass. The acceleration power spectral density (PSD) limit of the vibration table under different specimen masses, m/g
is generally given in the form of a curve as shown in Figure 12. ff
Figure 12 Harmonic power density curve of vibration table
Estimation of random performance of vibration table and basic parameters of random vibration control system are shown in Appendix A (reference) 5.3 Other requirements
The following vibration table performances shall also meet the requirements of vibration test specifications: static load;
Frequency range:
Anti-eccentric load capability:
Continuous working time;
Total distortion;
Lateral movement of work surface;
9. Acceleration uniformity of work surface;
h. Background noise;
Particle rate stability;
j. Fixed vibration accuracy and maximum sound level of radiated noise 5.4 Auxiliary table
For the perturbation test using auxiliary table, the performance parameters shall be selected according to GB/T11353 and meet the requirements of perturbation test specifications. 6. Requirements for test loads in performance parameter testing and verification of perturbation tables 6.1 Performance parameter testing and verification of mechanical vibration tables shall be carried out in accordance with JJG189. 6.2 Performance parameter testing and verification of electric vibration tables shall be carried out in accordance with JJG190. 6.3 Performance parameter testing and verification of hydraulic vibration tables shall be carried out in accordance with JJG638. 6.4 Requirements for test loads shall be in accordance with the provisions of Appendix C of GB10179, JB/T6076-92
Appendix A
Basic parameters of random performance estimation of vibration table and random alarm control system (reference part)
A1 Random performance estimation of vibration table
A1.1 Random performance verification of electric vibration table A1.1.1 Two transfer characteristics of electric alarm table The frequency response function H() of acceleration to current is: The frequency response function H.() of acceleration to voltage: H()=A()/I()
H.=A()/U()
Where: A() is the Fourier transform of the acceleration a output by the electric vibration table surface; ) is the Fourier transform of the output current i of the power amplifier of the electric vibration table; U() is the Fourier transform of the output voltage u of the power amplifier of the electric vibration table. The above two transfer characteristics vary with the load mass and can be calculated or obtained through experiments. A1.1.2 Current check
G()=G.()/IH()12
Wherein: ff—lower and upper limits of the operating frequency, Hz; Ie
G.(f)--acceleration power spectrum density function, G*/Hz; G.()—current power spectrum density function, G*/Hz; Iar—random current peak value, A;
—sinusoidal current peak value, A.
In this appendix, the first subscript S represents the sinusoidal condition and R represents the random condition; the second subscript R represents the root mean square value and P represents the bee value. In general, for any random variable Y that satisfies the normal distribution, we have: Yp=3Yu
Voltage check
G.()=G.()/ IH() 1 2
Acceleration check
Speed check
G(dfy/
Uup
Sine excitation force
Frequency range
100000
200000
500000
DC~1000
DC- 1000
DC~1000
DC~500
DC~500
DC-100
DC~500||t t||DC~100
Maximum negative line
Basic parameters of hydraulic vibration table
Maximum displacement
Note: ① The gravity of the rated load is generally taken as the exciting force 1/10~1/20 of the. This
no load
maximum acceleration
rated load
③The sinusoidal excitation force and frequency range in the table are old, The maximum displacements are all data under rated load conditions. Comparison of the main performances of three types of vibration tables Comparison of the main performances of three types of vibration tables Table 1 Working table size
Under specified load
Maximum extension distance
JB/ T6076-92
The common ranges of frequency and amplitude of the three types of vibration tables are shown in Figure 10. Table 4 Comparison of the main performances of the three types of vibration tables Type
Maximum thrust
Maximum displacement
Rated rate range
Waveform type
Waveform distortion
Automatic programming
Control parameters
Anti-eccentric load capability||tt| |Control accuracy
Energy-price ratio
Mechanical vibration table
Electric vibration table
Sine, random
Displacement, velocity, acceleration
Good waveform reproduction||tt| |Good power spectrum reproduction
High at low thrust
Low at high thrust
Common areas for hydraulic alarm stations
Common areas for electric alarm stations
Common areas of mechanical vibration tables
Common areas of frequency and amplitude of three types of vibration tables are compared in Figure 10
5 Basic requirements for vibration tables in vibration tests
The selected vibration tables The performance indicators should be able to meet the requirements of the test specifications. Hydraulic vibration table
is relatively wide. It can start from DC
sine, triangle, rectangular, random
displacement, velocity, acceleration
random waveform reproduction is good||tt| |The performance spectrum is well reproduced
Low when the thrust is small
High when the thrust is large
Limiting characteristics of sinusoidal vibration
The characteristic curve required by the vibration test should be The limit characteristics of displacement, velocity and acceleration of the vibration table under different specimen masses are generally in the form of the limit characteristic curve of sinusoidal vibration shown in Figure 11. Given.
5.2 Limit characteristics of random alarm
JB/T607692
Figure 11 Limit characteristic curve of alarm station under sinusoidal conditions 2.1
Frequency Hz
Vibration The random characteristic curve in the test specification should be below the limit characteristic curve when the vibration table is at the corresponding specimen mass. The acceleration power spectral density (PSD) limit of the vibration table at different specimen masses, m/g||tt ||It is generally given in the form of a curve as shown in Figure 12. ff
Figure 12 Harmonic power density curve of vibration table
The random performance estimation of vibration table and the basic parameters of random vibration control system are shown in Appendix A (reference) 5.3 Other requirements
The following vibration The performance of the platform should also meet the requirements of the vibration test specifications: static load;
frequency range:
anti-eccentric load capability:
continuous working time;
total distortion; | |tt||Horizontal movement of the work surface;
9. Acceleration uniformity of the work surface;
h. Background noise;
Particle rate stability;
j. Vibration fixing accuracy and maximum sound level of radiated noise 5.4 Auxiliary table
For the perturbation test using an auxiliary table, the performance parameters shall be selected in accordance with GB/T11353 and shall meet the requirements of the perturbation test specifications. 6. Requirements for test loads in performance parameter testing and verification of perturbation tables 6.1 Performance parameter testing and verification of mechanical vibration tables shall be carried out in accordance with JJG189. 6.2 Performance parameter testing and verification of electric vibration tables shall be carried out in accordance with JJG190. 6.3 Performance parameter testing and verification of hydraulic vibration tables shall be carried out in accordance with JJG638. 6.4 The requirements for test loads shall be in accordance with the provisions of Appendix C of GB10179 and Appendix A of JB/T6076-92 Random performance estimation of vibration table and basic parameters of random alarm control system (reference)
A1 Random performance estimation of vibration table
A1.1 Random performance verification of electric vibration table A1.1.1 Two transfer characteristics of electric vibration table Acceleration frequency response function of current H( ) is: the frequency response function of acceleration to voltage H.(): H()=A()/I()
H.=A()/U()
Where: A () Fourier transform of the acceleration a output from the electric vibration table; () Fourier transform of the output current i of the electric vibration table power amplifier; U()—Fourier transform of the output voltage u of the electric vibration table power amplifier, the above The two transfer characteristics vary with the load mass and can be calculated or obtained through experiments. A1.1.2 Current verification
G()=G.()/IH()12
Where: ff—lower and upper limits of operating frequency, Hz; Ie
G .(f)--Acceleration power spectral density function, G*/Hz; G.()--Current power spectral density function, G*/Hz; Iar--Random current peak value, A;
--Sinusoidal current Peak value, A.
In this appendix, the first subscript S indicates sinusoidal conditions, R indicates random conditions; the second subscript R indicates root mean square value, and P indicates bee value. Any random variable Y that satisfies the normal distribution is: Yp=3Yu
voltage check
G.()=G.()/ IH() 1 2
acceleration check
Speed check
G(dfy/
Uup
Sine excitation force
Frequency range
100000
200000
500000
DC~1000
DC- 1000
DC~1000
DC~500
DC~500
DC-100
DC~500||t t||DC~100
Maximum negative line
Basic parameters of hydraulic vibration table
Maximum displacement
Note: ① The gravity of the rated load is generally taken as the exciting force 1/10~1/20 of the. This
no load
maximum acceleration
rated load
③The sinusoidal excitation force and frequency range in the table are old, The maximum displacements are all data under rated load conditions. Comparison of the main performances of three types of vibration tables Comparison of the main performances of three types of vibration tables Table 1 Working table size
Under specified load
Maximum extension distance
JB/ T6076-92
The common ranges of frequency and amplitude of the three types of vibration tables are shown in Figure 10. Table 4 Comparison of the main performances of the three types of vibration tables Type
Maximum thrust
Maximum displacement
Rated rate range
Waveform type
Waveform distortion
Automatic programming
Control parameters
Anti-eccentric load capability||tt| |Control accuracy
Energy-price ratio
Mechanical vibration table
Electric vibration table
Sine, random
Displacement, velocity, acceleration
Good waveform reproduction||tt| |Good power spectrum reproduction
High at low thrust
Low at high thrust
Common areas for hydraulic alarm stations
Common areas for electric alarm stations
Common areas of mechanical vibration tables
Common areas of frequency and amplitude of three types of vibration tables are compared in Figure 10
5 Basic requirements for vibration tables in vibration tests
The selected vibration tables The performance indicators should be able to meet the requirements of the test specifications. Hydraulic vibration table
is relatively wide. It can start from DC
sine, triangle, rectangular, random
displacement, velocity, acceleration
random waveform reproduction is good||tt| |The performance spectrum is well reproduced
Low when the thrust is small
High when the thrust is large
Limiting characteristics of sinusoidal vibration
The characteristic curve required by the vibration test should be The limit characteristics of displacement, velocity and acceleration of the vibration table under different specimen masses are generally in the form of the limit characteristic curve of sinusoidal vibration shown in Figure 11. Given.
5.2 Limit characteristics of random alarm
JB/T607692
Figure 11 Limit characteristic curve of alarm station under sinusoidal conditions 2.1
Frequency Hz
Vibration The random characteristic curve in the test specification should be below the limit characteristic curve when the vibration table is at the corresponding specimen mass. The acceleration power spectral density (PSD) limit of the vibration table at different specimen masses, m/g||tt ||It is generally given in the form of a curve as shown in Figure 12. ff
Figure 12 Harmonic power density curve of vibration table
The random performance estimation of vibration table and the basic parameters of random vibration control system are shown in Appendix A (reference) 5.3 Other requirements
The following vibration The performance of the platform should also meet the requirements of the vibration test specifications: static load;
frequency range:
anti-eccentric load capability:
continuous working time;
total distortion; | |tt||Horizontal movement of the work surface;
9. Acceleration uniformity of the work surface;
h. Background noise;
Particle rate stability;
j. Vibration fixing accuracy and maximum sound level of radiated noise 5.4 Auxiliary table
For the perturbation test using an auxiliary table, the performance parameters shall be selected in accordance with GB/T11353 and shall meet the requirements of the perturbation test specifications. 6. Requirements for test loads in performance parameter testing and verification of perturbation tables 6.1 Performance parameter testing and verification of mechanical vibration tables shall be carried out in accordance with JJG189. 6.2 Performance parameter testing and verification of electric vibration tables shall be carried out in accordance with JJG190. 6.3 Performance parameter testing and verification of hydraulic vibration tables shall be carried out in accordance with JJG638. 6.4 The requirements for test loads shall be in accordance with the provisions of Appendix C of GB10179 and Appendix A of JB/T6076-92 Random performance estimation of vibration table and basic parameters of random alarm control system (reference)
A1 Random performance estimation of vibration table
A1.1 Random performance verification of electric vibration table A1.1.1 Two transfer characteristics of electric vibration table Acceleration frequency response function of current H( ) is: the frequency response function of acceleration to voltage H.(): H()=A()/I()
H.=A()/U()
Where: A () Fourier transform of the acceleration a output from the electric vibration table; () Fourier transform of the output current i of the electric vibration table power amplifier; U()—Fourier transform of the output voltage u of the electric vibration table power amplifier, the above The two transfer characteristics vary with the load mass and can be calculated or obtained through experiments. A1.1.2 Current verification
G()=G.()/IH()12
Where: ff—lower and upper limits of operating frequency, Hz; Ie
G .(f)--Acceleration power spectral density function, G*/Hz; G.()--Current power spectral density function, G*/Hz; Iar--Random current peak value, A;
--Sinusoidal current Peak value, A.
In this appendix, the first subscript S indicates sinusoidal conditions, R indicates random conditions; the second subscript R indicates root mean square value, and P indicates bee value. Any random variable Y that satisfies the normal distribution is: Yp=3Yu
voltage check
G.()=G.()/ IH() 1 2
acceleration check
Speed check
G(dfy/
Uup2 Limit characteristics of random vibration
JB/T607692
Figure 11 Limit characteristic curve of vibration table under sinusoidal conditions 2.1
Frequency Hz
The random characteristic curve in the vibration test specification should be below the limit characteristic curve when the vibration table is at the corresponding specimen mass. The acceleration power spectral density (PSD) limit of the vibration table under different specimen masses, m/g
is generally given in the form of a curve as shown in Figure 12. ff
Figure 12 Harmonic power density curve of vibration table
Estimation of random performance of vibration table and basic parameters of random vibration control system are shown in Appendix A (reference) 5.3 Other requirements
The following vibration table performances shall also meet the requirements of vibration test specifications: static load;
Frequency range:
Anti-eccentric load capability:
Continuous working time;
Total distortion;
Lateral movement of work surface;
9. Acceleration uniformity of work surface;
h. Background noise;
Particle rate stability;
j. Fixed vibration accuracy and maximum sound level of radiated noise 5.4 Auxiliary table
For the perturbation test using auxiliary table, the performance parameters shall be selected according to GB/T11353 and meet the requirements of perturbation test specifications. 6. Requirements for test loads in performance parameter testing and verification of perturbation tables 6.1 Performance parameter testing and verification of mechanical vibration tables shall be carried out in accordance with JJG189. 6.2 Performance parameter testing and verification of electric vibration tables shall be carried out in accordance with JJG190. 6.3 Performance parameter testing and verification of hydraulic vibration tables shall be carried out in accordance with JJG638. 6.4 Requirements for test loads shall be in accordance with the provisions of Appendix C of GB10179, JB/T6076-92
Appendix A
Basic parameters of random performance estimation of vibration table and random alarm control system (reference part)
A1 Random performance estimation of vibration table
A1.1 Random performance verification of electric vibration table A1.1.1 Two transfer characteristics of electric alarm table The frequency response function H() of acceleration to current is: The frequency response function H.() of acceleration to voltage: H()=A()/I()
H.=A()/U()
Where: A() is the Fourier transform of the acceleration a output by the electric vibration table surface; ) is the Fourier transform of the output current i of the power amplifier of the electric vibration table; U() is the Fourier transform of the output voltage u of the power amplifier of the electric vibration table. The above two transfer characteristics vary with the load mass and can be calculated or obtained through experiments. A1.1.2 Current check
G()=G.()/IH()12
Wherein: ff—lower and upper limits of the operating frequency, Hz; Ie
G.(f)--acceleration power spectrum density function, G*/Hz; G.()—current power spectrum density function, G*/Hz; Iar—random current peak value, A;
—sinusoidal current peak value, A.
In this appendix, the first subscript S represents the sinusoidal condition and R represents the random condition; the second subscript R represents the root mean square value and P represents the bee value. In general, for any random variable Y that satisfies the normal distribution, we have: Yp=3Yu
Voltage check
G.()=G.()/ IH() 1 2
Acceleration check
Speed check
G(dfy/
Uup2 Limit characteristics of random vibration
JB/T607692
Figure 11 Limit characteristic curve of vibration table under sinusoidal conditions 2.1
Frequency Hz
The random characteristic curve in the vibration test specification should be below the limit characteristic curve when the vibration table is at the corresponding specimen mass. The acceleration power spectral density (PSD) limit of the vibration table under different specimen masses, m/g
is generally given in the form of a curve as shown in Figure 12. ff
Figure 12 Harmonic power density curve of vibration table
Estimation of random performance of vibration table and basic parameters of random vibration control system are shown in Appendix A (reference) 5.3 Other requiremen
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