Some standard content:
Ship Industry Standard of the People's Republic of China
CB1359—2002
FL5365
Specification of rubber vibration isolator for warships
Replaces CB/T3925-1999
Specification of rubber vibration isolator for warshipsPublished in 2002-1120
Published by Commission of Science, Technology and Industry for National Defense
Implementation in 2003--0201
CB1359-2002
This specification is a revision of CB/T3925-1999. According to the document [1998]216 of the former State Bureau of Technical Supervision in December 1998, "Notice on the abolition of professional standards and national standards to be converted after rectification", the original professional standard ZBU47001-89 was directly adjusted to the industry standard CB/T3925-1999 through the document [1999]384 of the General Department of Shipbuilding.
Compared with CB/T3925-1999, this specification has the following technical differences: a) The tensile strength and tensile elongation of different rubber materials are added; b) The performance parameters of the three directions that the vibration isolator should provide are added; the storage date of the vibration isolator is modified;
The requirements for the limit device are added;
The loading speed of the static test is classified. e)
CB/T3925-1999 is abolished from the date of publication of this specification. Appendix A, Appendix B, Appendix C, and Appendix D of this specification are informative appendices. This specification is proposed by China Shipbuilding Industry Corporation. This specification is under the jurisdiction of China Shipbuilding Industry Comprehensive Technology and Economic Research Institute. The drafting units of this specification are: 704th Institute of China Shipbuilding Industry Corporation 7th Institute, China Shipbuilding Industry Comprehensive Economic Research Institute, Songjiang Rubber Products Factory, Wuxi Vibration Damper Factory.
The main drafters of this specification are: Tu Gengwei, Cai Zhenzhong, Zhou Qiang, Yang Jianming, Yu Hongbo. This specification was first issued as ZBU47001-89 in November 1989 and adjusted to CB/T3925-1999 in June 1999. Scope
Specification for rubber vibration isolators for ships
CB 1359-2002
This specification specifies the requirements, quality assurance and delivery preparation of rubber vibration isolators for ships (hereinafter referred to as vibration isolators). This specification is applicable to the design, manufacture and acceptance of vibration isolators with rubber as elastic body to isolate vibration and impact of ship equipment and reduce structure-borne noise.
2 Normative references
The clauses in the following documents are incorporated into this specification through reference. For all referenced documents with dates, any amendments (excluding errata) subsequently agreed upon based on this specification are not applicable to this specification: however, all parties shall study whether to use the latest versions of these documents. For GB/T191 Packaging Storage and Transportation Pictorial Marking
GB/T2298 Mechanical Vibration and Shock Effects
, the latest versions of the documents are applicable to this specification.
GB/T2941 Standard temperature and humidity for rubber test environment adjustment and inspection
Love time
Basic parameter verification methods for electrical and electronic equipment environmental testing equipment
GB/T5170.13/1985
Testing machinery
-185 Electrical and electronic equipment
GB/T5170.4-
Basic parameter verification methods for testing equipment
Vibration (sinusoidal)
Electric vibration table for test
GB/T5170.5-985 Electrical and electronic equipment Product environmental test equipment Basic parameter verification method Test hydraulic vibration table
GJB150.11 Military equipment environmental test method Salt spray test GJB150.181986 Military equipment environmental test method Impact test GJB179A-1996 Count sampling inspection procedure and table 3 requirements
3.1 Reliability
Under normal working conditions, the service life of the vibration isolator should not exceed five years. 3.2 Materials
The materials selected for the vibration isolator should have inspection qualifications and certificates (dynamic sine)
3.2.2 The rubber body of the vibration isolator should generally be made of oil-resistant rubber. When non-oil-resistant rubber materials are used, anti-oil protection measures should be taken on its surface.
3.2.3 The metal parts of the vibration isolator should have corrosion resistance, or corrosion-resistant measures should be taken on the surface. 3.3 Design and structure
3.3.1 The structure of the vibration isolator should meet the requirements of design performance and ship use environment conditions. 3.3.2 The structure of the vibration isolator should ensure that the rubber parts will not be damaged in a harsh impact environment. 3.3.3 The surface of the metal parts bonded to the rubber should have no sharp corners. Before vulcanization, the metal bonding surface should be cleaned of oil and sandblasted or shot peened.
3.3.4 When subjected to rated static load, dynamic load and impact, the components of the vibration isolator should not be separated or damaged. Except for impact, the metal components should not have plastic deformation.
3.4 Maintainability
CB1359-2002
Generally, vibration isolators are non-repairable products. For assembled and combined vibration isolators, the component repair time is 1h to 4h depending on the installation method of the unit and the vibration isolator.
3.5 Performance characteristics
3.5.1 Static load deformation characteristics
The static load deformation performance of the vibration isolator generally only provides static performance in the main load direction. When requested by the ordering party, the static performance in three directions shall be provided.
When the rated deformation of the vibration isolator is greater than 1mm, the deformation deviation range shall not exceed 20%; when the rated deformation of the vibration isolator is less than or equal to 1mm, the deformation deviation range shall not exceed 30%. 3.5.2 Dynamic characteristics www.bzxz.net
The dynamic performance of the vibration isolator generally only provides the dynamic performance in the main load-bearing direction. For the same type of vibration isolator, the natural frequency variation range in the main load-bearing direction shall not exceed 15%, and the natural frequency variation range in other directions shall not exceed 20%.
3.5.3 Impact characteristics
The natural frequency variation range in the main load-bearing direction of the same vibration isolator before and after impact shall not exceed 15%, and the natural frequency variation range in other directions shall not exceed ±20%.
3.5.4 Destruction load characteristics
When the destructive load is applied in the main load-bearing direction of the vibration isolator, the rubber parts of the vibration isolator shall not be peeled off from the metal, cracked or otherwise damaged. 3.5.5 Salt spray resistance characteristics
The metal components of the vibration isolator that has been subjected to the salt spray test should not have obvious corrosion, the rubber material surface should not crack or peel off, and the rubber and metal bonding surfaces should not have any peeling or damage.
3.6 Environmental requirements
The vibration isolator should be able to work normally within the temperature range of -5℃70℃. 3.6.1
The vibration isolator should reach the specified service life under the conditions of oil pollution, salt spray and sunlight. 3.6.2
When the impact input of the vibration isolator meets the requirements of Test 10 in GJB150.18-1986, the vibration isolator is allowed to deform, but it should not fall off.
Mechanical properties of rubber compound test pieces
The mechanical properties of oil-resistant vibration isolator rubber (such as nitrile rubber, chloroprene rubber) test pieces after vulcanization shall meet the requirements of Table 1; the mechanical properties of non-oil-resistant vibration isolator rubber (such as natural rubber) test pieces after vulcanization shall meet the requirements of Table 2. Table 1 Mechanical properties of oil-resistant vibration isolator rubber compound test piece Item
Tear strength
Tear elongation
Tear permanent deformation
Adhesion strength
Aging change rate (70℃×96h)
Brittle temperature
Shore hardness
≥16MPa
≥450% (40HA55HA)
≥400% (55HA～70HA)
≥3.9MPa
-20%～20%
≤-20℃
40HA～70HA (recommended)
Tear strength
Elongation at break
Permanent deformation at break
Adhesion strength
Aging change rate (70℃×96h)
Brittle temperature
Shore hardness
Mechanical properties of non-oil-resistant vibration isolator rubber compound test piece
≥20MPa
≥550% (40HA～55HA)
CB1359-2002
≥450% (55HA～70HA)
≥3.9MPa
-20%～20%
≤-20℃
40HA～70HA (recommended)
3.7.2 The mechanical properties of special rubbers (such as silicone rubber, polyurethane, etc.) and rubber compounds with a hardness below 40HA or above 70HA for other vibration isolators shall be agreed upon by the ordering party and the design unit or manufacturer. 3.8 Dimensions
The dimensions of the vibration isolator, especially the height in the main load-bearing direction, shall meet the design requirements. 3.9 Weight
The weight error of the vibration isolator shall not be greater than ±5% of the design value. 3.10 Product marking
The model, manufacturer's name, trademark or factory logo of the vibration isolator shall be clearly molded on the visible part of the vibration isolator. For large vibration isolators, a copper nameplate can be fixed in a conspicuous position. The nameplate should have the following content: a) Product model;
Manufacturer's name;
Trademark or factory logo;
Manufacture date or factory number;
Rated load and deformation.
If it is impossible to mark directly on the vibration isolator, other methods should be used to clearly express the content on the nameplate. 3.11
Appearance quality
Rubber surface quality
The rubber surface should be smooth, without defects such as tumors, burrs, cracks, sand holes, bubbles, etc., but local rough lines and mold indentations with a depth of no more than 0.5mm are allowed.
3.11.2 Metal surface quality
The metal surface (including coating) should be smooth, free of cracks, corrosion or other mechanical damage. 4 Quality assurance regulations
4.1 Inspection categories
The inspection categories specified in this standard are as follows:
a) Identification inspection:
b) Quality consistency inspection.
4.2 Test conditions
CB 1359--2002
4.2.1 Unless otherwise specified, various tests shall be carried out in accordance with the provisions of this standard. The tests shall be carried out on the contractor's test bench or in a laboratory equipped with marine condition test equipment.
4.2.2 The ambient temperature for the vibration isolator test shall be 25℃±5℃. 4.2.3 The ambient temperature for the rubber compound test shall be in accordance with the provisions of GB/T2941. 4.3 Appraisal test
4.3.1 Test items
The test items for appraisal test are shown in Table 3.
Table 3 Test items
Test items
Static load deformation characteristics
Dynamic characteristics
Requirements Article number
3.10,3.11
Appearance and marking
Note: ● Required items; - Items not required for inspection. 4.3.2 The number of samples to be inspected
At least 1 unit.
4.3.3 Qualification determination
Test method Article number
When all the inspection items meet the requirements, the inspected vibration isolator is judged to be qualified. 4.4 Quality consistency inspection
4.4.1 Inspection items
Identification inspection
Each batch of products shall be subject to quality consistency inspection. The quality consistency inspection items are shown in Table 3.4.4.2 Grouping
The quality consistency inspection is divided into Group A, Group B and Group C. 4.4.3 The number of samples to be inspected and the sampling plan
Quality consistency inspection
All products shall be subject to Group A inspection. Group B and Group C inspections shall be selected from the products that have passed the Group A inspection. The number of samples to be inspected shall be at least 1 unit. The sampling plan shall be based on the S-3 plan of one normal sampling in GJB179A-1995, and samples shall be randomly selected. The recommended batch size is 51 to 90. The qualified quality level AQL is 4.0.
4.4.4 Treatment after group C inspection
Samples after group C inspection should not be delivered for use as qualified products. 4.5 Inspection method
4.5.1 Test instruments
The test instruments should have a calibration certificate and be within the valid calibration period. 4.5.2 Test device
4.5.2.1 Static performance devices generally include machinery that can evenly apply force and instruments that measure force and deformation. The allowable error of the device should not be greater than 1%, and the minimum indicated value of force should not be greater than 10% of the rated load of the vibration isolator. When the device is doing static load characteristics, its loading capacity should be CB1359-2002
greater than 1.5 times the rated load of the vibration isolator under test; when doing destructive load, the loading capacity of the device should be greater than 15 times the rated load of the vibration isolator under test.
The measurement error of the displacement measuring instrument should not be greater than 1%. 4.5.2.2 The dynamic performance device should have equipment to generate sinusoidal signals and instruments to test frequency and vibration displacement. The error requirements of basic parameters such as amplitude waveform distortion, frequency and displacement indication of sinusoidal excitation equipment should comply with the provisions of Appendix B of GB/T5170.13-1985, Appendix C of GB/T5170.14-1985 and Appendix C of GB/T5170.15-1985. 4.5.3 Static load deformation characteristics
For vibration isolators with a deformation of no more than 5mm, the loading speed should not cause the deformation of the vibration isolator to exceed 1mm/min; for vibration isolators with a deformation of more than 5mm, the loading speed should not cause the deformation of the vibration isolator to exceed 5mm/min. For static characteristics, preload should be performed from zero load to 12% of the rated load. Each preload should be held at the upper limit of the load for more than 30s, and stop for 1mi after each preload. During the third loading, the deformation values under 0%, 1%, and 1.1 times the rated load shall be measured, and the static stiffness value of the vibration isolator shall be calculated according to formula (1). The result shall meet the requirements of 3%5.1. 10.
Wherein:
K--static stiffness value, in Newton per meter P. ——The value of the rated load of the vibration isolator
The first digit is 4
^1.—1.1The value of the static deformation of the vibration isolator under the rated load is in meters (m):
0.9The value of the static deformation of the vibration isolator under the rated load is in meters (m). 109
4.5.4 Dynamic characteristics
The dynamic characteristics of the vibration isolator can be calculated according to the excitation method, time waveform method, ellipse method or self-vibration attenuation method, see Appendix A, Appendix B, Appendix C, Appendix D, and the results meet the requirements of 3.5.2. 4.5.5 Impact
Impact shall be carried out according to the method specified in GJB150.18-1986. The result shall meet the requirements of 3.5.3. 4.5.6 Destruction
Fix the vibration isolator on the device and load it evenly in the main load direction until it reaches 15 times the rated load. The result shall meet the requirements of 3.5.4. 4.5.7 Salt spray
Salt spray shall be carried out according to the provisions of GJB150.11. The result shall meet the requirements of 3:5:5:4.5.8 Dimension
Measure with a ruler or caliper. The result shall meet the requirements of 3.8. 4.5.9 Weight
Measure with a scale or table scale. The result shall meet the requirements of 99. 4.5.10 Appearance and marking
Inspect the appearance quality of the vibration isolator by visual inspection. The result shall meet the requirements of 3.10 and 3.11. 5 Delivery preparation
Sealing and packaging
5.1.1 The exposed metal surfaces and mounting screw holes of the vibration isolator should be treated with anti-rust treatment. 5.1.2 The rubber surface of the vibration isolator should not be painted with paint that reacts chemically with rubber. 5.1.3 The accompanying documents should be packed in a well-sealed plastic bag with moisture-proof agent. The accompanying documents include: a) Packing list;
Instruction manual;
CB 1359-2002
c) Resume book;
d) Inspection certificate.
5.2 Packing
The packaging and packing method of the vibration isolator should ensure that the product is not damaged during transportation from shipment to the place designated by the ordering party. The product certificate should be attached to the package.
5.3 Transportation and storage
5.3.1 The vibration isolator should not be exposed to rain or snow during transportation. 5.3.2 Transportation should be smooth, without impact, collision and fall. 5.3.3 The vibration isolator should be stored in a well-ventilated room before installation. When storing, the vibration isolator should be in a free state, avoid direct sunlight, and stay away from various heat and light sources. And the vibration isolator should be prevented from contacting with oil, paint, acid, alkali and other substances. 5.3.4, under the specified storage conditions, the storage period of the vibration isolator is two years from the date of storage, and the service life is five years. For vibration isolators that exceed the specified period by less than one year, their service life is still five years after re-inspection. For vibration isolators that exceed the specified storage period by one to two years, their service life should be appropriately shortened after re-inspection, and the shortened time is 1/2 of the extended storage period. During the use of the vibration isolator, each vibration isolator should be checked regularly. If cracks are found on the inner and outer surfaces of the rubber of the vibration isolator, or it is detached from the metal, it should be replaced in time.
5.4 Marking
The outside of the packaging box should have the words or symbols such as "No Tumbling", "Afraid of Wetness", "Handle with Care" as specified in GB/T191. The following contents should be clearly and neatly marked on the outside of the packaging box: 5.4.2
Name and address of consignee:
Name and address of consignee and name of manufacturer; b))
Model of vibration isolator;
Net weight of vibration isolator and gross weight of packaging box; dimensions of packaging box.
Explanation
Contents of ordering documents
The following contents shall be stated in the contract or order: Model of vibration isolator;
b) Quantity;
c) Main technical parameters, such as rated load, deformation, natural frequency, installation method, etc. 6.2 Terms and Definitions
The general terms of this specification shall be in accordance with the provisions of GB/T2298. The following are special terms and definitions. 6.2.1
Static stiffness KsstiffnessKs
The ratio of the load increment to the corresponding deformation increment measured by the vibration isolator under the condition of slowly increasing and decreasing load. 6.2.2
Dynamic elastic stiffness K, dynamicstiffnessK is the ratio of the transmission force amplitude component with the same phase as the displacement to the displacement amplitude, and its value is calculated according to formula (2): K
wherein:
transmission force amplitude, unit is Newton (N); F
o——displacement amplitude, unit is meter (m). 6
Focoss
Dynamic loss stiffness KphaseangledifferenceK2 is the ratio of the transmission force amplitude component with a phase difference of 90° with the displacement to the displacement amplitude, and its value is calculated according to formula (3): K2
wherein:
F——-transmission force amplitude, unit is Newton (N); %—displacement amplitude, unit is meter (m). 6.2.4
loss angle loss angle8
phase difference of transmission force displacement.
Fosing
Loss coefficient β (tangent of loss angle) losscoefficient β is the ratio of dynamic loss stiffness K to dynamic elastic stiffness K, and its value is calculated according to formula (4): K2
β= tan=
Where:
-value of loss angle, in radians (rad); K—-value of dynamic elastic stiffness, in Newtons per meter (N/m); Kz-value of dynamic loss stiffness, in Newtons per meter (N/m). CB1359-2002
CB1359-2002
Basic excitation method
Appendix A
(Informative Appendix)
Excitation method for dynamic characteristics test of vibration isolator
Apply constant displacement excitation Uo to the vibration table, slowly change the vibration frequency from small to large, and measure the maximum displacement amplitude ax of the load m and the corresponding natural frequency f (see Figure A.1). The loss coefficient 8 of the vibration isolator is calculated according to formula (A.1) and formula (A.2), and the dynamic elastic stiffness K of the vibration isolator is calculated according to formula (A.3): β
Wherein:
β—loss coefficient
μ——ratio
dynamic elastic stiffness value, unit is Newton per meter (NK
-the value of the natural frequency at the maximum displacement amplitude Xom, unit is Hertz (Hz);
the value of the load mass, unit is Singram (kg).xsinto
U.·sinwt|| tt||Load excitation method
Constant excitation force amplitude method
CB1359-2002
When the excitation force amplitude F applied to the vibration isolator is constant, slowly change the vibration frequency from small to large, measure the maximum displacement amplitude Xix of the load and the corresponding natural frequency f, and calculate the dynamic elastic stiffness K of the vibration isolator according to formula (A.3). Then, under the condition of a certain frequency fi lower than the natural frequency f., measure the corresponding displacement amplitude Xl (see Figure A.2), and the loss coefficient β of the vibration isolator is calculated according to formula (A.4):
1-(f/fo)2
Where:
fo)
is the value of a certain frequency lower than the natural frequency f, in Hertz (Hz); the value of the natural frequency when the maximum displacement amplitude is m, in Hertz (Hz). F. · sin r
sin(t-)
A.2.2 Method in which the amplitude of the exciting force is proportional to the square of the frequency f
When the amplitude of the exciting force applied to the vibration isolator is proportional to the square of the frequency, slowly change the exciting frequency from small to large, measure the maximum displacement amplitude Xm of the load and its corresponding natural frequency f. , the dynamic elastic stiffness K of the vibration isolator is calculated according to formula (A.3). At the same time, the displacement value Xo2 of the vibration isolator at frequency f is measured (see Figure A.3), and the loss coefficient β of the vibration isolator is calculated and determined according to formula (A.5): 1
≥4f)
1-(f, fo)2
yu?-(fo/ f2)4
Where:
(1.5fo≤f2≤4f)
fo——the value of the natural frequency at the maximum displacement amplitude Xomx, in Hertz (Hz); f2——the value of the frequency at the displacement amplitude Xo, in Hertz (Hz). (A.5)4) Calculate and obtain:
1-(f/fo)2
Where:
fo)
The value of a certain frequency when it is lower than the natural frequency f, in Hertz (Hz); the value of the natural frequency when the maximum displacement amplitude is m, in Hertz (Hz). F. · sin r
sin(t-)
A.2.2 The method that the amplitude of the exciting force is proportional to the square of the frequency f
When the amplitude of the exciting force applied to the vibration isolator is proportional to the square of the frequency, slowly change the exciting frequency from small to large, measure the maximum displacement amplitude Xm of the load and its corresponding natural frequency f. , The dynamic elastic stiffness K of the vibration isolator is calculated according to formula (A.3) and obtained. At the same time, the displacement value Xo2 of the vibration isolator at frequency f is measured (see Figure A.3), and the loss coefficient β of the vibration isolator is calculated and determined according to formula (A.5): 1
≥4f)
1-(f, fo)2
yu?-(fo/ f2)4
Where:
(1.5fo≤f2≤4f)
fo——the value of the natural frequency at the maximum displacement amplitude Xomx, in Hertz (Hz); f2——the value of the frequency at the displacement amplitude Xo, in Hertz (Hz). (A.5)4) Calculate and obtain:
1-(f/fo)2
Where:
fo)
The value of a certain frequency when it is lower than the natural frequency f, in Hertz (Hz); the value of the natural frequency when the maximum displacement amplitude is m, in Hertz (Hz). F. · sin r
sin(t-)
A.2.2 The method that the amplitude of the exciting force is proportional to the square of the frequency f
When the amplitude of the exciting force applied to the vibration isolator is proportional to the square of the frequency, slowly change the exciting frequency from small to large, measure the maximum displacement amplitude Xm of the load and its corresponding natural frequency f. , The dynamic elastic stiffness K of the vibration isolator is calculated according to formula (A.3) and obtained. At the same time, the displacement value Xo2 of the vibration isolator at frequency f is measured (see Figure A.3), and the loss coefficient β of the vibration isolator is calculated and determined according to formula (A.5): 1
≥4f)
1-(f, fo)2
yu?-(fo/ f2)4
Where:
(1.5fo≤f2≤4f)
fo——the value of the natural frequency at the maximum displacement amplitude Xomx, in Hertz (Hz); f2——the value of the frequency at the displacement amplitude Xo, in Hertz (Hz). (A.5)
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.