Some standard content:
ICS19.060
Registration number:
Chinese Machinery Industry Standard
JB/T82B8—2001
Replacement of JB/T8288-—1995
Hydraulic vibration table
Hydraulic vibration generator system2001-12-04Released
China Machinery Industry Federation
Implementation on 2002-03-01
This standard replaces J8/T8288-1995 Full pressure vibration table 3. Compared with JB/TB288-1995, the main changes of this standard are as follows: the foreword is added; the requirements for the temperature of the oil tank are added and the test methods are specified (see 5.2 and 6.3); the random disassembly test system and its test methods are added (see 5.9 and 6.18~6.21); the impact test system and its test methods are added (see 5.106.22 and 6.23); JB/T8288-2001-adjusted the basic parameters of the series of models of the dynamic substation, modified the rated working lower limit frequency: from 0H to 0.1Hz (see Table I); the working ambient temperature range: from 10℃-30℃ to 5℃-40℃ (see 5.1); and the requirements for the error of the rated indication are increased (see 2). Other national standards related to this standard are: CB/T13309-1991 Technical conditions for mechanical perturbation tables: GB /T133[0—1991 Technical conditions for electric actuators. This standard was proposed by the National Technical Committee for Testing Standardization. This standard is under the jurisdiction of the National Technical Committee for Testing Machine Standardization. The responsible drafting units of this standard are: Beijing Institute of Automation of Mechanical Industry, Institute of Long-set Testing Machines. The responsible units for the development of this standard are: Suzhou Testing Instrument Factory, Northwest Machinery Factory. The main drafters of this standard are: Wang Jingyong, Zhu Xuezhe, Guan Zhenguo, Wen Zuyang, Wang Xiaohua. The versions of the standards replaced by this standard are as follows: The first edition of this standard was first issued in March 1989 with the national standard number GB10861-1989 [in November 1992, it was cleaned up by the former State Technical Supervision Bureau and adjusted to a recommended machinery industry standard], and was renumbered as B/T8288-[995 and issued in April 1996 according to the industry standard by the former Ministry of Machinery Industry, and the original national standard number was abolished at the same time. 1 Scope
Hydraulic vibration table
This standard specifies the functions and main technical conditions of the hydraulic vibration table. JB/T82B8—2DQ1
Power source, hydraulic vibration generator, filter system, power control device and dynamic control system. It should be able to generate one or more types of vibration, random, typical and normal excitation. The standard is suitable for single-stage vibration table (hereinafter referred to as hydraulic vibration table). 2 Scope
The provisions of the following documents are quoted by this standard or become the main provisions of this standard. For all referenced documents with a specified date, all subsequent revisions (including the contents) are not applicable to this standard. However, the parties to the agreement based on this standard may use the latest versions of these documents. For all referenced documents with no specified date, the latest version is applicable to this standard. GT2299 Machine data and terminology (R/T2298-1991.IS02041:1990, Vbratiunandhoek-Vocabular.MEO
CB:52611-1992 General technical requirements for testing machines CB/3768 Determination of noise source sound power level - Method CB10179-1933 Reverse pressure servo motor test method for measuring the speed of equipment (IS0R682:1989, NEO) [8&T6:4-1992 Test will be the packaging, packaging label, wall transportation, technical requirements 3 technology and definitions
This standard is made in GB/T2298 The following terms and definitions are defined in conjunction with the relevant technical documentation: 3.1
rated load rabedmaes
maximum test load specified in the relevant technical documentation. 3.2
rated excitation force ratedexcitatinafarceundersinusoidecunditionsmaximum sinusoidal excitation force under rated test load. 3.3
ratedsinusoidalaceelerationrated force and maximum acceleration value under rated load. 3.4
rated limit The limit value of the frequency-dependent stress under the load of the fixed position is generally expressed as a light limit curve. 3.5
The new rated frequency range is used for the higher frequency range, 3.6
The scanning accuracy of the fixed vibration is 1
FB/T when the fixed vibration is performed at 80% of the rated stress every six minutes. B2882001
's maximum value.
Rated random excitation force ratedrandom excitation force The maximum excitation force reached when the power is increased by a constant acceleration under rated load conditions. 4.1 The rated load series shall comply with the provisions of Table 1, and the parameters in Table 1 shall be used preferentially. 1
Tentative load
Rated sinusoidal excitation force
Maximum positionbZxz.net
Maximum excitation speed
Frequency range
50, 100, 200, 500, 1000, 1500, 2 000, 2 500.5 0002,5.10, 50, 80, 100, 200, 300.500.S00.1 000±5,± 10,±12.5,±25,±30.±90.±80 ±100.±150. ±2000,20,30,50,100,150,200
0.1(1)~10,0.10)-2001()~50.0.1(1~100.0.1(1-150.0.1(1)200, 0.1(1)-350, 0.1(1)- 500, 4.1(1~ 1 000
Note: The maximum value in the above figure is the single peak value.
42 The following basic parameters should be given according to the technical specifications of the dynamic platform: rated load
b) rated sinusoidal excitation force;
0) rated sinusoidal acceleration:
Maximum speed:
Maximum position
Average rated frequency range:
With the maximum allowable eccentric torque.
5 Technical requirements
5.1 Working conditions
The dynamic platform should work normally under the following conditions: Ambient temperature 5℃~40℃:
6) The relative humidity is not more than 85:
The voltage change of the electric motor is within +10% of the specified voltage; There is no vibration in the surrounding medium and the vibration of the dynamic platform technical performance. 5.2 The oil content in the dynamic platform oil tank should be 10-45%. 5.3 Continuous working time
The continuous working time of the vibration table shall not be less than 4h. 5.4 Appearance
The appearance of the vibration table shall comply with the provisions of Chapter 8 of IEC 2611-1-2. 5.5 Vibration protection
Manufacturer's vibration table (A-weighted) model value: 5.6 Installation requirements
The ratio of the rated acceleration of the vibration table output to the main vibration direction of the vibration table shall not be greater than 5%. 5.7 5.7.1 The frequency indication error shall comply with the provisions of Table 2 as long as the frequency range is within the specified range: Table 2 JE/T8288-2001 The frequency indication error shall be greater than the allowable value H 10-gf 1 000 sinusoidal dynamic control instrument closed loop acceleration rate dynamic control dynamic range should not be less than . S.73 The random signal of the dynamic wire should meet the requirements of translation, normal distribution and dynamic performance. 5.8 If the dynamic test system is active, the signal-to-noise ratio of the test system should not be less than 50dB. The random sampling rate of the test system should not be greater than 25%. Individual points are allowed to be greater than 50%, but records should be made. 5.a.3 The distortion of the test system should not be greater than 5.8.4 When the test system is working, the acceleration amplitude of the table should not be greater than 25. Individual points are allowed to be greater than 25%, and records should be made. 5.6.5. The transverse dynamic ratio of the system (the ratio of the virtual amplitude of acceleration in the positive direction to the amplitude of acceleration in the negative direction) shall not be greater than 25%. 5.8.5 The maximum allowable error of the dynamic amplitude indication of the test system is ±10%. 5.6.7 The accuracy of the system scanning control is ±1.5d8. 5.8.5 The actual amplitude of the system is within 30min. 5.9 The dynamic test system
5.9.1 The control range of the three-dimensional system should not be less than 35,5 9.2 The maximum allowable error of the total mean square value of the speed change of the air transport system is ≥10%. 5.3 The sum of the total mean square root of the system's operating frequency range and the total speed value of the working frequency range should not be greater than 10%:
5.94 The maximum allowable error of the speed power indication of the system is +20%5.95 The accuracy of the acceleration mean square value control is +1d under the 90% speed control. 5.9.6 The accuracy of the power density control of the three-stage system under the random operation of 90% of the control is 3 Pa 5.10 Special test system||tt| |5.3.1 The maximum allowable error of pulse width of the impact acceleration waveform (half-sine, sawtooth, trapezoidal) is 20%. 5.10.2 The maximum allowable error of pulse amplitude of the cold shock acceleration waveform (half-sine, sawtooth, trapezoidal, etc.) is +20%. B Test method
The disassembled flange should be tested under the condition of installation standard test according to the negative section (the amount is the specified negative integral). The shape, size and flow connection of the test hole of the standard negative plastic should be in accordance with the test requirements of Chapter C3 of Appendix C of GB/T10179-1. 6.1 Test fast strength
JB/T B2B8—2001
The test instrument shall meet the requirements of Table 3.
Standard meter
Voltmeter
Crack meter
Digital frequency meter
Force 5
Accuracy better than 2%
Precisely better than ±0.1%
Technical requirements
Piezoelectric acceleration meter The maximum allowable error of the measurement amplitude is 3% (including piezoelectric accelerometer with recognition function)
Service channel measurement and reception
Three-phase accelerometer
First, measure
Level recording device (or other corresponding recording device) and
Vibration density analysis
6.2 Test conditions
The test should be carried out under the working conditions specified in 5.1. The maximum allowable error of the vertical measurement is ±10% and the distortion of the measuring body is not greater than
Technical requirements are the same as those of the serial number 5
The transverse speed ratio of each axis is not greater than 3% and the accuracy is better than ±10%
The accuracy is better than +L5 G8
The accelerometer and AC voltmeter are used to check the test conditions, and the results should meet the requirements of 5.1. B.3 Determination of oil temperature
Place the oil temperature gauge near the oil outlet, and the oil temperature measured after the system works in thermal equilibrium shall meet the requirements of 5.2. 6.4 Determination of working time
Use a specific speed control, and set the value to 80% of the rated sensitivity. Normal working time shall meet the requirements of 53. 6.5 Appearance inspection
The appearance of the vibration table shall be inspected by visual inspection and shall meet the requirements of 5.4. 6.6 Measurement of short-term vibration power The vibration table shall be within the rated working frequency range, and the amplitude of the locking amplitude shall be used as the sweeping force, and the maximum value of the output power shall be measured and recorded with a level meter (A weighting).
The measurement of the output power level shall be carried out in accordance with CB/T3768, and the vibration table shall be measured in accordance with the requirements of 5.5. .In order to determine the error of the frequency indication of the control receiver, the following method is used to determine the frequency indication of the test system. A sinusoidal test system is set to measure and output a positive signal at least for the high, medium and low sections within the working frequency range. Use a frequency meter or spectrum analyzer to measure its frequency indication, and record the rated frequency indication of the test system and the measured value of the frequency meter or analyzer respectively. The difference between the two should meet the requirements of 5.7.1:
Random test system working frequency range At least set a continuous increase of hb
with more than 20 peaks in the high, medium and low sections within the working frequency range. Connect the input end of the spectrum analyzer to the output end of the random vibration controller, measure the frequency value predicted by the engineer, and record the frequency indication of the test system and the measured value of the analyzer respectively. The result should meet the requirements of 5.7.1 . 6.8 Definition of the dynamic range of vibration control The vibration control system uses the spectrum shown in Figure 1, and performs random closed-loop control at an appropriate level. The output spectrum of the signal generator is directly analyzed to measure the dynamic range that the dynamic control device can balance. 4
JB/TB288—2001
~The value of is determined by the supplier and the demander based on the rated working frequency range of different vibration tables, and the difference in the frequency of section b should be as small as possible. The general results should meet the requirements of 5.7.2.
6.9 Inspection of the randomness of the vibration control instrument
Use a density analyzer or analyzer (or other instruments with probability density analysis capabilities) to measure the estimated signal of the test system, compare the output probability density load with the theoretical normal distribution density curve, and obtain their consistency. Its shape should not be seriously changed, and the stability test can be carried out by methods such as rotation test. The measurement results should meet the requirements of 5.7.3. 6.10 Determination of the acceleration value ratio of the test system The acceleration meter is connected to the center of the standard platform or negative potential surface (the installation position of the acceleration meter should be moved as much as possible before the measurement). The output of the measuring instrument is high. When the vibration is in the working state and the auxiliary output signal of the control is zero, the effective value of the acceleration at the center of the platform or the load top surface (a, and the acceleration value) is calculated according to formula (1): [
=20 yuan g
Where:
Rated speed value of the platform (effective value)
The control device output signal is zero, the acceleration value at the center of the platform or negative potential surface (effective value). The measurement results should meet the requirements of 5.8.1. Requirements. 6.1T Determination of the distortion of the test system (1) Install the accelerometer according to the method in 6.1D of this standard, and measure the distortion of the axis with a vibration meter. The vibration table is set at a constant speed and amplitude, and at least 26 values are selected evenly. The vibration amplitude is set, and the accelerometer distortion at the selected frequency is measured in turn. The measurement results shall meet the requirements of 5.8.2. 6.12 Determination of the position distortion of the test system The displacement of the vibration table surface is connected to the distortion measuring instrument (by spectrum analysis), and the position distortion of the vibration table is measured at more than 4 frequency values (including the lowest and highest frequencies) within the working frequency range. The measurement results shall meet the requirements of 5.8.3. 6.13 Test system table width uniformity determination The mobile table is unloaded, and 5 accelerometers are installed at the center of the table and the 4 evenly distributed points at the center of the table. For surface shape measurement, Archimedes should be installed at the center of the table and different diameters and phases. In the constant speed section of the vibration table, the frequency value of the most 6 times the frequency is selected, and the rated intensity is sold! , the multi-channel measurement of the average speed meter is connected, and more than 6 frequency values and the corresponding rated speed (displacement) amplitude are newly taken within the frequency range of the rated disease. The short-term vibration value of each position is obtained from the instrument, and the average vibration amplitude is calculated according to formula (2) and the actual N: Amlaix1%
[. In this measurement, the absolute value of the difference between the vibration amplitude of the service point and the vibration amplitude of the center is: the center point vibration amplitude.
The measurement results shall meet the requirements of 5.8.4.
6.14 Determination of lateral vibration ratio of test system--{2
Within the rated speed and the control range of vibration, select 6 or more frequency values at random, and measure the vibration values in three directions at % of the rated speed value. Calculate the lateral vibration ratio T-x100%
Where:
44-two mutually recorded vertical components perpendicular to the main vibration direction: 5-the amplitude of the main vibration direction.
The results shall meet the requirements of 5.8.5.
6.15 Determination of the vibration difference of test system This standard is 6.The accelerometer is installed by the method of 10. The instrument is selected and within the rated working frequency range, three frequency values of high, medium and low are selected. At the selected frequency point, three action values of large, small and large are selected. According to the specification, the vibration amplitude indication error is calculated according to the formula (4)
8,-x100%
In the formula:
The indication value of the vibration value of the control station in the same measurement: The indication value of the vibration amplitude of the same measurement. The installation result shall meet the requirements of 1.8.6,
6.16 The scanning of the test system shall be accurately determined. 4
The installation method of 6.10 of this standard shall be adopted. The instrument is connected to the level recorder, and the sweep frequency vibration is reported at a speed of 1 min within the sweep frequency range, and the perturbation intensity is 80% of the rated working curve. The straightness of the line recorded on the level recorder shall meet the requirements of 5.8.7.
6.17 The acceleration of the test system shall be determined according to the method 6.1 of this standard. At any two frequencies within the range of the vibration control and acceleration, at the selected frequency point, the vibration meter shall be shaken for 30 minutes at a time with a rated acceleration of 0. The amplitude indication of the vibration meter shall be recorded once every 10 minutes. The indication shall be calculated according to the formula (5) x10%
where:
In each measurement, the deviation of the acceleration amplitude indication of the vibration meter from the acceleration value setting value is:
According to the setting amplitude.
The result meets the requirements of 5.8.8.
6.18 Determination of the dynamic range of the random velocity power spectrum of the test system - (5
Add rated reverse load to the dynamic platform, connect the accelerometer (as close as possible to the test system itself) as rigidly as possible 6
JB/T a288-2001
The source is located near the center of the platform surface, and the charge amplifier is extracted. The shape shown in Figure 2 is set on the controller, and the balance is appropriate. The charge amplifier is connected to the subject harmonic analysis. The test system can be checked to avoid the range of the test. The test results should meet the requirements of 5.9.1. l
The difference between the working frequency range of the different platforms given by the supply and demand parties should be as small as possible. Check that the test system is correctly set up with the measurement group 2, and appropriate modifications are allowed. The shape should be given. Figure 2
6.19 Determination of the total root mean square value of the test system The platform is loaded with rated load, and the accelerometer is installed in the same way as 6.18. The test system is set up, balanced and produces the shape shown in Figure 3. PSD +
times the process
Note: For the meaning of 4fF-j, see 5.5.8.2 of CRT10179-1988. Figure 3
Use one of the following methods to measure the total mean square value of acceleration: 6dB/times the process
6.19.1 Use a full-scale test instrument to measure the total mean square value of acceleration. The low-pass filter cutoff frequency is set at 2H, and the high mean square value voltmeter averaging time is set at 3. The total mean square value of acceleration is 4, calculated according to formula (6), AA||tt| |Where:
--test system indication:
A,——the actual measured value.
At, A, should be read at the same time as much as possible.
J8/8288-2001
The total average value of the added noise in the frequency band should include the total RMS of acceleration within the upper limit frequency f10% variation 1IIz (whichever is greater): Generally, a high-pass and low-pass filter combination can be used to measure the total RMS value within the test frequency band, and the RMS extreme value of the added noise outside the frequency band can be calculated by the formula. Measurement results The requirements of 5.9.2 and 5.9.3 shall be met. 6.19.2 The source bandwidth shall be measured by a spectrum analyzer, and the total mean square limit of the frequency drop within and outside the frequency band shall be calculated, and the error shall be calculated according to formula (6). The measurement results shall meet the requirements of 5.9.2 and 59.3. 6.20 The test system shall be equipped with a random frequency generator or a non-speed generator. The installation shall be the same as 6.18. The test system shall be set up and balanced to produce the spectrum shown in Figure 3. Take 3 rates in the straight line of the transmission shape and use the error analysis The instrument shall measure the harmonics at each spiral rate. The frequency of the sub-calibrator shall be determined by 6 (1/3~1/5) 4/ ... When the controlled wave is out of the error band, use spectrum analysis to measure each waveform separately. First, the zero point of the waveform is returned, and then the zero point at the right end is displayed. The difference between the two zero points is the pulse height of this waveform. Calculate the error according to formula (8) and record the waveform. The measurement result should meet the requirements of 101.
Contact sensor
Electrical efficiency large number
Final shape
Language compliance
6.23 Measurement of pulse amplitude error of basic vehicle impact waveform JB/TB28BB—2001
Measure each impact waveform. Use the analyzer to measure the pulse height A from the equal point to the end of the waveform. If the waveform has vibration, measure the pulse from the zero point to the center line of the original part as the height A. Calculate the error according to formula (8) and record it with a recorder. The test results shall meet the requirements of 5.10.2. A,-A
7 Inspection rules
7.1 Factory inspection
x10096
Vibration testers must pass the inspection before they can leave the factory and should be accompanied by a product quality certificate. The ex-factory test items of the ex-factory ex-works platform shall be selected from the items specified in 5 according to the requirements of the purchaser. 8) If sinusoidal vibration is required, the random vibration part of 5.7, items 5.9 and 5.10 do not need to be tested. If the purchaser only requires random vibration, items 5.8 and 9.10 do not need to be tested. If the purchaser requires impact, the random vibration part of 5.7, items 5.8 and 5.9 do not need to be tested. If the purchaser agrees, 5.3 can be changed.
了.2 Type inspection
7.2.1 Type inspection shall be conducted on all items specified in Chapter 4 and Chapter 5 according to the functions of the vibration table. 7.2.2 In any of the following cases, the vibration table shall be subjected to type inspection: a) New product trial production or finalization of old product production: after the formal production of the product, its structure design, materials, packaging, process and related supporting components have major changes that can affect the product performance;
c) When the inspection results are significantly different from the results of the previous type inspection; when the quality supervision and inspection agency has put forward quality inspection requirements. 7.3 Judgment rules
7.3.1 For factory inspection, the qualified rate of each vibration table factory inspection item reaches 100% to be qualified. 7.3.2 For the pot test, at least one set shall be disassembled from each batch. If the sample is qualified after the test, the buyer shall determine that the test batch is a qualified batch. If the sample is unqualified after the test, the buyer shall determine that the test batch is a batch without defects. B. Marking, packaging, storage
8.1 Marking
The disassembly table shall have a nameplate and shall indicate the following: Name:
b Model:
Main technical parameters (load, positive vibration force, maximum displacement, working condition); manufacturer name;
Company factory number:
Date of manufacture.
8.2 Packaging
The standard packaging of the toggle table shall comply with the provisions of Chapter 4 of JH/T6147-1992. 6.3 Storage
The vibration table should be stored in a stagnation-proof and wind-proof warehouse, where no corrosive gases or chemical substances are allowed to exist.7.
6.17 Test system acceleration as much as possible according to the method 6.1 of this standard, the vibration tester shall be measured and measured at any two frequencies within the range of acceleration control, at the selected frequency point, with a rated acceleration of 0, and the vibration is continuously shaken for 30min each time, and the vibration amplitude indication of the vibration meter is recorded once every 10min. The indication value is calculated according to formula (5) x10%
where:
In each measurement, the deviation between the vibration amplitude indication of the vibration meter and the acceleration value setting value is:
according to the setting amplitude.
The result meets the requirements of 5.8.8.
6.18 Determination of the dynamic range of the random velocity power spectrum of the test system - (5
Add rated reverse load to the dynamic platform, connect the accelerometer (as close as possible to the test system itself) as rigidly as possible 6
JB/T a288-2001
The source is located near the center of the platform surface, and the charge amplifier is extracted. The shape shown in Figure 2 is set on the controller. The balance is appropriate to the level of the disk. The total charge amplifier is connected to the subject harmonic analysis. The test case can be checked to avoid the test system can be broken. The test results should meet the requirements of 5.9.1. l
The difference between the working frequency range of the different platforms given by the supply and demand parties should be as small as possible. Check the system to correctly set the measurement group 2, and allow appropriate changes. The shape should be given. Figure 2
6.19 Determination of the total root mean square value of the test system The platform is loaded with rated load, and the accelerometer is installed in the same way as 6.18. The test system is set up, balanced and produces the shape shown in Figure 3. PSD +
times the process
Note: For the meaning of 4fF-j, see 5.5.8.2 of CRT10179-1988. Figure 3
Use one of the following methods to measure the total mean square value of acceleration: 6dB/times the process
6.19.1 Use a full-scale test instrument to measure the total mean square value of acceleration. The low-pass filter cutoff frequency is set at 2H, and the high mean square value voltmeter averaging time is set at 3. The total mean square value of acceleration is 4, calculated according to formula (6), AA||tt| |Where:
--test system indication:
A,——the actual measured value.
At, A, should be read at the same time as much as possible.
J8/8288—2001
The total average value of the added noise in the frequency band should include the total RMS of acceleration within the upper limit frequency f10% variation 1IIz (whichever is greater): Generally, a high-pass and low-pass filter combination can be used to measure the total RMS value within the test frequency band, and the RMS extreme value of the added noise outside the frequency band can be calculated by the formula. Measurement results The requirements of 5.9.2 and 5.9.3 shall be met. 6.19.2 The source bandwidth shall be measured by a spectrum analyzer, and the total mean square limit of the frequency drop within and outside the frequency band shall be calculated, and the error shall be calculated according to formula (6). The measurement results shall meet the requirements of 5.9.2 and 59.3. 6.20 The test system shall be installed in the same manner as 6.18. The test system shall be set up and balanced to produce the spectrum shown in Figure 3. Take 3 rates in the straight line of the transmission shape and use the error analysis The instrument shall measure the harmonics at each spiral rate. The frequency of the sub-calibrator shall be determined by 6 (1/3~1/5) 4/ ... When the controlled wave is out of the error band, use spectrum analysis to measure each waveform separately. First, the zero point of the waveform is returned, and then the zero point at the right end is displayed. The difference between the two zero points is the pulse height of this waveform. Calculate the error according to formula (8) and record the waveform. The measurement result should meet the requirements of 101.
Contact sensor
Electrical efficiency large number
Final shape
Language compliance
6.23 Measurement of pulse amplitude error of basic vehicle impact waveform JB/TB28BB—2001
Measure each impact waveform. Use the analyzer to measure the pulse height A from the equal point to the end of the waveform. If the waveform has vibration, measure the pulse from the zero point to the center line of the original part as the height A. Calculate the error according to formula (8) and record it with a recorder. The test results shall meet the requirements of 5.10.2. A,-A
7 Inspection rules
7.1 Factory inspection
x10096
Vibration testers must pass the inspection before they can leave the factory and should be accompanied by a product quality certificate. The ex-factory test items of the ex-factory ex-works platform shall be selected from the items specified in 5 according to the requirements of the purchaser. 8) If sinusoidal vibration is required, the random vibration part of 5.7, items 5.9 and 5.10 do not need to be tested. If the purchaser only requires random vibration, items 5.8 and 9.10 do not need to be tested. If the purchaser requires impact, the random vibration part of 5.7, items 5.8 and 5.9 do not need to be tested. If the purchaser agrees, 5.3 can be changed.
了.2 Type inspection
7.2.1 Type inspection shall be conducted on all items specified in Chapter 4 and Chapter 5 according to the functions of the vibration table. 7.2.2 In any of the following cases, the vibration table shall be subjected to type inspection: a) New product trial production or finalization of old product production: after the formal production of the product, its structure design, materials, packaging, process and related supporting components have major changes that can affect the product performance;
c) When the inspection results are significantly different from the results of the previous type inspection; when the quality supervision and inspection agency has put forward quality inspection requirements. 7.3 Judgment rules
7.3.1 For factory inspection, the qualified rate of each vibration table factory inspection item reaches 100% to be qualified. 7.3.2 For the pot test, at least one set shall be disassembled from each batch. If the sample is qualified after the test, the buyer shall determine that the test batch is a qualified batch. If the sample is unqualified after the test, the buyer shall determine that the test batch is a batch without defects. B. Marking, packaging, storage
8.1 Marking
The disassembly table shall have a nameplate and shall indicate the following: Name:
b Model:
Main technical parameters (load, positive vibration force, maximum displacement, working condition); manufacturer name;
Company factory number:
Date of manufacture.
8.2 Packaging
The standard packaging of the toggle table shall comply with the provisions of Chapter 4 of JH/T6147-1992. 6.3 Storage
The vibration table should be stored in a stagnation-proof and wind-proof warehouse, where no corrosive gases or chemical substances are allowed to exist.7.
6.17 Test system acceleration as much as possible according to the method 6.1 of this standard, the vibration tester shall be measured and measured at any two frequencies within the range of acceleration control, at the selected frequency point, with a rated acceleration of 0, and the vibration is continuously shaken for 30min each time, and the vibration amplitude indication of the vibration meter is recorded once every 10min. The indication value is calculated according to formula (5) x10%
where:
In each measurement, the deviation between the vibration amplitude indication of the vibration meter and the acceleration value setting value is:
according to the setting amplitude.
The result meets the requirements of 5.8.8.
6.18 Determination of the dynamic range of the random velocity power spectrum of the test system - (5
Add rated reverse load to the dynamic platform, connect the accelerometer (as close as possible to the test system itself) as rigidly as possible 6
JB/T a288-2001
The source is located near the center of the platform surface, and the charge amplifier is extracted. The shape shown in Figure 2 is set on the controller. The balance is appropriate to the level of the disk. The total charge amplifier is connected to the subject harmonic analysis. The test case can be checked to avoid the test system can be broken. The test results should meet the requirements of 5.9.1. l
The difference between the working frequency range of the different platforms given by the supply and demand parties should be as small as possible. Check the system to correctly set the measurement group 2, and allow appropriate changes. The shape should be given. Figure 2
6.19 Determination of the total root mean square value of the test system The platform is loaded with rated load, and the accelerometer is installed in the same way as 6.18. The test system is set up, balanced and produces the shape shown in Figure 3. PSD +
times the process
Note: For the meaning of 4fF-j, see 5.5.8.2 of CRT10179-1988. Figure 3
Use one of the following methods to measure the total mean square value of acceleration: 6dB/times the process
6.19.1 Use a full-scale test instrument to measure the total mean square value of acceleration. The low-pass filter cutoff frequency is set at 2H, and the high mean square value voltmeter averaging time is set at 3. The total mean square value of acceleration is 4, calculated according to formula (6), AA||tt| |Where:
--test system indication:
A,——the actual measured value.
At, A, should be read at the same time as much as possible.
J8/8288—2001
The total average value of the added noise in the frequency band should include the total RMS of acceleration within the upper limit frequency f10% variation 1IIz (whichever is greater): Generally, a high-pass and low-pass filter combination can be used to measure the total RMS value within the test frequency band, and the RMS extreme value of the added noise outside the frequency band can be calculated by the formula. Measurement results The requirements of 5.9.2 and 5.9.3 shall be met. 6.19.2 The source bandwidth shall be measured by a spectrum analyzer, and the total mean square limit of the frequency drop within and outside the frequency band shall be calculated, and the error shall be calculated according to formula (6). The measurement results shall meet the requirements of 5.9.2 and 59.3. 6.20 The test system shall be installed in the same manner as 6.18. The test system shall be set up and balanced to produce the spectrum shown in Figure 3. Take 3 rates in the straight line of the transmission shape and use the error analysis The instrument shall measure the harmonics at each spiral rate. The frequency of the sub-calibrator shall be determined by 6 (1/3~1/5) 4/ ... When the controlled wave is out of the error band, use spectrum analysis to measure each waveform separately. First, the zero point of the waveform is returned, and then the zero point at the right end is displayed. The difference between the two zero points is the pulse height of this waveform. Calculate the error according to formula (8) and record the waveform. The measurement result should meet the requirements of 101.
Contact sensor
Electrical efficiency large number
Final shape
Language compliance
6.23 Measurement of pulse amplitude error of basic vehicle impact waveform JB/TB28BB—2001
Measure each impact waveform. Use the analyzer to measure the pulse height A from the equal point to the end of the waveform. If the waveform has vibration, measure the pulse from the zero point to the center line of the original part as the height A. Calculate the error according to formula (8) and record it with a recorder. The test results shall meet the requirements of 5.10.2. A,-A
7 Inspection rules
7.1 Factory inspection
x10096
Vibration testers must pass the inspection before they can leave the factory and should be accompanied by a product quality certificate. The ex-factory test items of the ex-factory ex-works platform shall be selected from the items specified in 5 according to the requirements of the purchaser. 8) If sinusoidal vibration is required, the random vibration part of 5.7, items 5.9 and 5.10 do not need to be tested. If the purchaser only requires random vibration, items 5.8 and 9.10 do not need to be tested. If the purchaser requires impact, the random vibration part of 5.7, items 5.8 and 5.9 do not need to be tested. If the purchaser agrees, 5.3 can be changed.
了.2 Type inspection
7.2.1 Type inspection shall be conducted on all items specified in Chapter 4 and Chapter 5 according to the functions of the vibration table. 7.2.2 In any of the following cases, the vibration table shall be subjected to type inspection: a) New product trial production or finalization of old product production: after the formal production of the product, its structure design, materials, packaging, process and related supporting components have major changes that can affect the product performance;
c) When the inspection results are significantly different from the results of the previous type inspection; when the quality supervision and inspection agency has put forward quality inspection requirements. 7.3 Judgment rules
7.3.1 For factory inspection, the qualified rate of each vibration table factory inspection item reaches 100% to be qualified. 7.3.2 For the pot test, at least one set shall be disassembled from each batch. If the sample is qualified after the test, the buyer shall determine that the test batch is a qualified batch. If the sample is unqualified after the test, the buyer shall determine that the test batch is a batch without defects. B. Marking, packaging, storage
8.1 Marking
The disassembly table shall have a nameplate and shall indicate the following: Name:
b Model:
Main technical parameters (load, positive vibration force, maximum displacement, working condition); manufacturer name;
Company factory number:
Date of manufacture.
8.2 Packaging
The standard packaging of the toggle table shall comply with the provisions of Chapter 4 of JH/T6147-1992. 6.3 Storage
The vibration table should be stored in a stagnation-proof and wind-proof warehouse, where no corrosive gases or chemical substances are allowed to exist.18. Set up the test system, balance and produce the vibration shown in Figure 3. PSD +
times
Note: See 5.5.8.2 of CRT10179-1988. Figure 3
Measure the total mean square acceleration using one of the following methods: 6dB/s
6.19.1 Use a full-scale test instrument to measure the total mean square acceleration. The low-pass filter cutoff frequency is set at 2h, and the high-mean square voltage meter averaging time is set at 3h. The total mean square acceleration indication is 4, calculated according to formula (6), AA
Where:
- test system indication:
A, - the actual measured value.
At, A, should be read at the same time as far as possible
J8/8288—2001
The total mean square value of the added noise outside the band should include the total RMS of acceleration within the upper limit frequency f10% variation 1IIz (whichever is greater): Generally, a high-pass and low-pass filter combination can be used to measure the total RMS value within the test frequency band, and the RMS extreme value of the added noise outside the band can be calculated. The measurement results should meet the requirements of 5.9.2 and 5.9.3. 6.19.2 Use a spectrum analyzer to measure the source width, calculate the total RMS limit value within the test band and outside the band, and calculate the error according to formula (6). The measurement results should meet the requirements of 5.9.2 and 59.3. 6.20 The test system shall be equipped with a random frequency generator or a power amplifier. The installation shall be the same as 6.18. The test system shall be set up and balanced to produce the spectrum shown in Figure 3. Take 3 frequencies in the straight line of the transmission. Use the analyzer to measure the harmonics at each frequency. The frequency of the analyzer shall be (1/3~1/5)4/4. At the same time, the indication of the test system shall be recorded. The relative error shall be calculated. The test results shall meet the requirements of 5.9.4.
6.21 The test system shall be accelerated. The total root mean square and power shall be low. The accuracy of the test system shall be controlled under the condition of 90% elimination. The test results shall meet the requirements of 5.9.5 and 5.9.6. 6.2 Determination of basic shock wave pulse width error Install the accelerometer and connect the measuring instruments according to Figure 4. The test system sets the basic shock wave width error of half-sine, three-dimensional, back-to-back teeth, and trapezoidal shapes (as shown in Figure 5) respectively, and balances them. When the controlled wave has a difference band, use spectrum analysis to measure each waveform separately. First, guide the zero point of the shape band, then the zero point on the right end, and the difference between the two zero points is the pulse width of this waveform. Calculate its error according to the formula (&) and record the shape. The measurement result should meet the requirements of 101.
Connecting the sensor
Electrical efficiency
Final form
Language and protocol
6.23 Measurement of pulse amplitude error of base vehicle impact waveform JB/TB28BB-2001
Measure each impact waveform. Use the analyzer to measure the pulse height A from the equal point to the end of the waveform. If the waveform has vibration, take the pulse from the zero point to the center line of the original part as the height A, calculate the difference 5 according to formula (8) and record it with a recorder. The test results should meet the requirements of 5.10.2. A,-A
7 Inspection rules
7.1 Factory inspection
x10096
Vibration products must pass the inspection before leaving the factory and should be accompanied by a product quality certificate. The factory test items of the vibration table shall be selected from the items specified in 5 according to the requirements of the purchaser. 8) If sinusoidal vibration is required, the random vibration part of 5.7, items 5.9 and 5.10 do not need to be tested. If the purchaser only requires random vibration, items 5.8 and 9.10 do not need to be tested. If the purchaser requires impact, the random vibration part of 5.7, items 5.8 and 5.9 do not need to be tested; if the purchaser agrees, 5.3 can be changed.
7.2 Type inspection
7.2.1 Type inspection shall be carried out on all items specified in Chapter 4 and Chapter 5 according to the function of the vibration table. 7.2.2 In one of the following circumstances, the vibration table shall be subjected to a type inspection: a) For the trial production of new products and the finalization appraisal of the transfer of old products to the factory: After the formal production of the product, its structural design, materials, packaging, process and related supporting components have changed substantially, which may affect the performance of the product; c) When the inspection results are significantly different from the results of the previous type inspection; When the quality supervision and inspection agency has put forward quality inspection requirements. 7.3 Judgment rules 7.3.1 For factory inspection, the qualified rate of each vibration table factory inspection item reaches 100% to be qualified. 7.3.2 For type inspection, at least one set shall be disassembled from each batch. If the sample is qualified after inspection, the inspection batch of products shall be judged as a qualified batch. If the sample is unqualified after inspection, the inspection batch of products shall be judged as an unqualified batch. B. Marking, packaging, storage
8.1 Marking
The vibration table should have a nameplate and indicate the following: Name:
b Model:
Main technical parameters: load, positive vibration force, maximum displacement, working condition, standard country); manufacturer name;
company factory number:
Manufacturing date.
8.2 Packaging
The vibration table standard packaging should comply with the provisions of Chapter 4 of JH/T6147-1992. 6.3 Storage
The vibration table should be stored in a windproof warehouse, and no corrosive gas or chemical substances should be present in the warehouse. 918. Set up the test system, balance and produce the vibration shown in Figure 3. PSD +
times
Note: See 5.5.8.2 of CRT10179-1988. Figure 3
Measure the total mean square acceleration using one of the following methods: 6dB/s
6.19.1 Use a full-scale test instrument to measure the total mean square acceleration. The low-pass filter cutoff frequency is set at 2h, and the high-mean square voltage meter averaging time is set at 3h. The total mean square acceleration indication is 4, calculated according to formula (6), AA
Where:
- test system indication:
A, - the actual measured value.
At, A, should be read at the same time as far as possible
J8/8288—2001
The total mean square value of the added noise outside the band should include the total RMS of acceleration within the upper limit frequency f10% variation 1IIz (whichever is greater): Generally, a high-pass and low-pass filter combination can be used to measure the total RMS value within the test frequency band, and the RMS extreme value of the added noise outside the band can be calculated. The measurement results should meet the requirements of 5.9.2 and 5.9.3. 6.19.2 Use a spectrum analyzer to measure the source width, calculate the total RMS limit value within the test band and outside the band, and calculate the error according to formula (6). The measurement results should meet the requirements of 5.9.2 and 59.3. 6.20 The test system shall be equipped with a random frequency generator or a power amplifier. The speed shall be the same as that of 6.18. The test system shall be set up and balanced to produce the spectrum shown in Figure 3. Take 3 frequencies in the straight line of the transmission. Use the analyzer to measure the harmonics at each frequency. The frequency of the analyzer shall be (1/3~1/5)4/4. At the same time, the indication of the test system shall be recorded. The relative error shall be calculated. The test results shall meet the requirements of 5.9.4.
6.21 The test system shall be accelerated by the total root mean square and the power shall be controlled by the test system. The accuracy of the test system shall be determined under the condition of 90% elimination. The test results shall meet the requirements of 5.9.5 and 5.9.6. 6.2 Determination of basic shock wave pulse width error Install the accelerometer and connect the measuring instruments according to Figure 4. The test system sets the basic shock wave width error of half-sine, three-dimensional, back-to-back teeth, and trapezoidal shapes (as shown in Figure 5) respectively, and balances them. When the controlled wave has a difference band, use spectrum analysis to measure each waveform separately. First, guide the zero point of the shape band, then the zero point on the right end, and the difference between the two zero points is the pulse width of this waveform. Calculate its error according to the formula (&) and record the shape. The measurement result should meet the requirements of 101.
Connecting the sensor
Electrical efficiency
Final form
Language and protocol
6.23 Measurement of pulse amplitude error of base vehicle impact waveform JB/TB28BB-2001
Measure each impact waveform. Use the analyzer to measure the pulse height A from the equal point to the end of the waveform. If the waveform has vibration, take the pulse from the zero point to the center line of the original part as the height A, calculate the difference 5 according to formula (8) and record it with a recorder. The test results should meet the requirements of 5.10.2. A,-A
7 Inspection rules
7.1 Factory inspection
x10096
Vibration products must pass the inspection before leaving the factory and should be accompanied by a product quality certificate. The factory test items of the vibration table shall be selected from the items specified in 5 according to the requirements of the purchaser. 8) If sinusoidal vibration is required, the random vibration part of 5.7, items 5.9 and 5.10 do not need to be tested. If the purchaser only requires random vibration, items 5.8 and 9.10 do not need to be tested. If the purchaser requires impact, the random vibration part of 5.7, items 5.8 and 5.9 do not need to be tested; if the purchaser agrees, 5.3 can be changed.
7.2 Type inspection
7.2.1 Type inspection shall be carried out on all items specified in Chapter 4 and Chapter 5 according to the function of the vibration table. 7.2.2 In one of the following circumstances, the vibration table shall be subjected to a type inspection: a) For the trial production of new products and the finalization appraisal of the transfer of old products to the factory: After the formal production of the product, its structural design, materials, packaging, process and related supporting components have changed substantially and may affect the performance of the product; c) When the inspection results are significantly different from the results of the previous type inspection; When the quality supervision and inspection agency has put forward quality inspection requirements. 7.3 Judgment rules 7.3.1 For factory inspection, the qualified rate of each vibration table factory inspection item reaches 100% to be qualified. 7.3.2 For type inspection, at least one set shall be disassembled from each batch. If the sample is qualified after inspection, the inspection batch of products shall be judged as a qualified batch. If the sample is unqualified after inspection, the inspection batch of products shall be judged as an unqualified batch. B. Marking, packaging, storage
8.1 Marking
The vibration table should have a nameplate and indicate the following: Name:
b Model:
Main technical parameters: load, positive vibration force, maximum displacement, working condition, country); manufacturer name;
company factory number:
Date of manufacture.
8.2 Packaging
The vibration table packaging should comply with the provisions of Chapter 4 of JH/T6147-1992. 6.3 Storage
The vibration table should be stored in a windproof warehouse, and no corrosive gas or chemical substances should be present in the warehouse. 923 Measurement of pulse amplitude error of impact waveform of base vehicle JB/TB28BB—2001
Measure each impact waveform. Use the analyzer to measure the pulse height A from the equal point to the top of the waveform. If the top waveform has vibration, take the pulse from the zero point to the center line of the original part as the height A, calculate the error 5 according to formula (8) and record it with a recorder. The test results should meet the requirements of 5.10.2. A,-A
7 Inspection rules
7.1 Factory inspection
x10096
The vibration must be inspected and qualified before it can be shipped and shall be accompanied by a product quality certificate. The ex-factory test items of the ex-factory excavator shall be selected from the items specified in 5 according to the requirements of the purchaser. 8) If the purchaser requires sinusoidal vibration, the random vibration part of 5.7, items 5.9 and 5.10 do not need to be tested. If the purchaser requires only random vibration, items 5.8 and 9.10 do not need to be tested. If the purchaser requires impact, the random vibration part of 5.7, items 5.8 and 5.9 do not need to be tested. If the purchaser agrees, 5.3 can be changed.
7.2.1 Type inspection shall be carried out on all items specified in Chapter 4 and Chapter 5 according to the function of the vibration table. 7.2.2 In one of the following circumstances, the vibration table shall be subjected to a type inspection: a) For the trial production of new products and the finalization appraisal of the transfer of old products to the factory: After the formal production of the product, its structural design, materials, packaging, process and related supporting components have changed substantially and may affect the performance of the product; c) When the inspection results are significantly different from the results of the previous type inspection; When the quality supervision and inspection agency has put forward quality inspection requirements. 7.3 Judgment rules 7.3.1 For factory inspection, the qualified rate of each vibration table factory inspection item reaches 100% to be qualified. 7.3.2 For type inspection, at least one set shall be disassembled from each batch. If the sample is qualified after inspection, the inspection batch of products shall be judged as a qualified batch. If the sample is unqualified after inspection, the inspection batch of products shall be judged as an unqualified batch. B. Marking, packaging, storage
8.1 Marking
The vibration table should have a nameplate and indicate the following: Name:
b Model:
Main technical parameters: load, positive vibration force, maximum displacement, working condition, country); manufacturer name;
company factory number:
Date of manufacture.
8.2 Packaging
The vibration table packaging should comply with the provisions of Chapter 4 of JH/T6147-1992. 6.3 Storage
The vibration table should be stored in a windproof warehouse, and no corrosive gas or chemical substances should be present in the warehouse. 923 Measurement of pulse amplitude error of impact waveform of base vehicle JB/TB28BB—2001
Measure each impact waveform. Use the analyzer to measure the pulse height A from the equal point to the top of the waveform. If the top waveform has vibration, take the pulse from the zero point to the center line of the original part as the height A, calculate the error 5 according to formula (8) and record it with a recorder. The test results should meet the requirements of 5.10.2. A,-A
7 Inspection rules
7.1 Factory inspection
x10096
The vibration must be inspected and qualified before it can be shipped and shall be accompanied by a product quality certificate. The ex-factory test items of the ex-factory excavator shall be selected from the items specified in 5 according to the requirements of the purchaser. 8) If the purchaser requires sinusoidal vibration, the random vibration part of 5.7, items 5.9 and 5.10 do not need to be tested. If the purchaser requires only random vibration, items 5.8 and 9.10 do not need to be tested. If the purchaser requires impact, the random vibration part of 5.7, items 5.8 and 5.9 do not need to be tested. If the purchaser agrees, 5.3 can be changed.
7.2.1 Type inspection shall be carried out on all items specified in Chapter 4 and Chapter 5 according to the function of the vibration table. 7.2.2 In one of the following circumstances, the vibration table shall be subjected to a type inspection: a) For the trial production of new products and the finalization appraisal of the transfer of old products to the factory: After the formal production of the product, its structural design, materials, packaging, process and related supporting components have changed substantially, which may affect the performance of the product; c) When the inspection results are significantly different from the results of the previous type inspection; When the quality supervision and inspection agency has put forward quality inspection requirements. 7.3 Judgment rules 7.3.1 For factory inspection, the qualified rate of each vibration table factory inspection item reaches 100% to be qualified. 7.3.2 For type inspection, at least one set shall be disassembled from each batch. If the sample is qualified after inspection, the inspection batch of products shall be judged as a qualified batch. If the sample is unqualified after inspection, the inspection batch of products shall be judged as an unqualified batch. B. Marking, packaging, storage
8.1 Marking
The vibration table should have a nameplate and indicate the following: Name:
b Model:
Main technical parameters: load, positive vibration force, maximum displacement, working condition, standard country); manufacturer name;
company factory number:
Manufacturing date.
8.2 Packaging
The vibration table standard packaging should comply with the provisions of Chapter 4 of JH/T6147-1992. 6.3 Storage
The vibration table should be stored in a windproof warehouse, and no corrosive gas or chemical substances should be present in the warehouse. 9
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