SJ 20593-1996 General specification for all-metal wire rope vibration isolators
Some standard content:
Military standard for the electronics industry of the People's Republic of China FL0199
SJ20593-96
General specification for
all metal wire-cable vibration isolatorPublished on August 30, 1996
Implementation on January 1, 1997
Approved by the Ministry of Electronics Industry of the People's Republic of China Military standard for the electronics industry of the People's Republic of China General specification for
all metal wire - cable vibration isolator1 Scope
1.1 Subject content
SJ 20593-96
This specification specifies the requirements, quality assurance regulations, delivery preparation and other main contents of all metal wire-cable vibration isolators (hereinafter referred to as isolators).
1.2 Scope of application
This specification is applicable to all-metal wire rope vibration isolators on military electronic products. 1.3 Classification
Vibration isolators are classified according to their external structure as follows: a. T-type - the external structure is a strip spiral; b. Q-type - the external structure is a spherical body; c. B-type - the external structure is a semi-ring body; d. QT-type - the external structure is other shapes. 2 Referenced Documents
GB 191--90
GB/T 2298--91
GJB 150. 1--86
GJB150.3—86
GJR150.4—86
GJB 150.9--86
GJB 150.10-86
GJB150.11—86
Packaging, Storage and Transportation Pictorial Symbols
Terms for Mechanical Vibration and Shock
General Principles for Environmental Test Methods for Military Equipment
Environmental Test Methods for Military Equipment High Temperature Test Environmental Test Methods for Military Equipment Low Temperature Test Environmental Test Methods for Military Equipment Wet Heat Test Environmental Test Methods for Military Equipment, Mold Test Environmental Test Methods for Military Equipment Salt Spray Test GJB 150.15—86
Military equipment environmental test method Acceleration test GJB 150.16—86
GJB 150.18—86
GJB 179—86
SJ/T 10179—91
Military equipment environmental test method Moving test Military equipment environmental test method Impact test Count sampling inspection procedures and tables
Metallic type vibration isolators General specification
The Ministry of Electronics Industry of the People's Republic of China Issued on August 30, 1996 Implemented on January 1, 1997
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3 Requirements
3.1 Model naming
3.1.1 Naming method
SI20593-96
The vibration isolator model consists of the product name code and product structural parameters. The product name code is represented by GG, and the product structural parameters consist of the structural shape classification number, the maximum input energy (capacity), and the main load-bearing direction height, and the parameters are separated by a short dash.
Main load-bearing direction height
Maximum input energy (capacity)
Structural shape classification number
Name code
3.1.2 Marking example
The structural shape is a strip spiral, the maximum input energy (capacity) is 2.8J, and the main load-bearing direction (Z: vertical) height is 33mm: GGT2.8—33
3.2 Qualified appraisal case
The products submitted in accordance with this specification should be qualified products or approved products. 3.3 Materials
The selected materials shall meet the various performance requirements specified in this specification. 3.4 Design
The steel wire rope elastic body of the vibration isolator shall be able to produce elastic deformation in any degree of freedom in space: there shall be no looseness or slippage between the steel wire rope and the connected components; the strength design of each component shall ensure safety and reliability during the service period, and the surface shall be treated with corrosion protection; the structure shall be simple, the installation shall be convenient, and it shall be adaptable to any installation method. 3.5 Structure
The vibration isolator is composed of steel wire rope, fixed clamp plate, fixing hoop or threaded connection (such as screws, nuts) and other components. The steel wire rope elastic body is firmly assembled into one piece by fixing the clamping plate and the fixing hoop or threaded connection. It can also be assembled into one piece by other methods. The mounting hole of the vibration isolator is a screw hole. If there is a through hole requirement, it should be stated in the contract or order. The appearance structure of the T-type vibration isolator is shown in Appendix A (supplement).
3.6 Performance
The performance parameters of the T-type vibration isolator in the vertical (Z direction), transverse (Y direction), longitudinal (X direction) and 45 degree oblique support direction are shown in Appendix A (Supplement).
3.6.1 Static load deformation characteristics
The static load-deformation characteristics of the vibration isolator under the condition of continuous increase of load in the effective elastic deformation range shall be given, generally expressed as a load-deformation curve (see 4.6.4). 3.6.2 Bearing mass
When specified in the contract or order, the vibration isolator shall be able to meet the bearing mass range value for normal operation of the vibration isolation system (see 2-
4.6.5).
3.6.3 Peak response frequency
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When specified in the contract or order, the first-order peak response frequency value of the vibration isolator under the test conditions specified in 4.6.6 at the actual bearing mass shall be given. The permissible deviation of the peak response frequency of the isolators of the same production batch under the same quality conditions is ±10% (see 4.6,6).
3.6.4 Peak amplification factor
The peak amplification factor of the isolator under the test conditions specified in 4.6.7 shall not be greater than 3 (see 4.6.7). 3.6.5 Vibration transmissibility
When specified in the contract or order, the vibration transmissibility of the vibration isolation system under the test conditions specified in 4.6.6 shall be given when the isolator is under the actual load-bearing mass (see 4.6.8). 3.6.6 Impact transmissibility
When specified in the contract or order, the impact transmissibility of the vibration isolation system under the environmental conditions specified in Article 6.5.3 of SJ/T10179 when the isolator is actually bearing the mass shall be given (see 4.6.9). #3.6.7 Maximum dynamic deformation
The maximum dynamic deformation value of the isolator without affecting normal operation shall be given. The allowable deviation range of the isolators of the same production batch is ±5% (see 4.6.10). The maximum allowable dynamic deformation of T-type isolators is shown in Appendix A (supplement). 3.6.8 Maximum impact force
The maximum impact force that the isolator can withstand under the maximum dynamic deformation shall be given. The allowable deviation of the isolators of the same production batch is ±10% (see 4.6.11). The maximum impact force of T-type isolators is shown in Appendix A (supplement). 3.6.9 Maximum input energy (capacity) The maximum input energy value that the vibration isolator can withstand under the maximum dynamic deformation should be given. The allowable deviation of the vibration isolators of the same production batch is ±15% (see 4.6.12). The maximum input energy that the T-type vibration isolator can withstand is shown in Appendix A (Supplement). 3.7 Environmental adaptability
3.7.1 High temperature
The vibration isolator should be able to work normally under high temperature conditions of 175℃ (see 4.6.13). 3.7.2 Low temperature
The vibration isolator should be able to work normally under low temperature conditions of -75C (see 4.6.14). 3.7.3 Humidity and heat
The vibration isolator should be able to work normally under the humid and hot environmental conditions specified in GIB150.9, without affecting the appearance and performance requirements (see 4.6.15).
3.7.4 Fungus
Vibration isolators used in offshore and coastal areas shall be able to work normally after the fungus test specified in GJB150.10, and shall not affect the appearance and performance requirements (see 4.6.16).
3.7.5 Salt spray
Vibration isolators shall be able to work normally after the salt spray atmospheric condition test specified in GJB150.11, and shall not have rust spots on the appearance, and shall not affect the performance requirements (see 4.6.17).
3.7.6 Acceleration
Vibration isolators shall be able to work normally after the acceleration environmental condition test specified in GIB150.15 (see 4.6.18). If there are other requirements, they shall be implemented in accordance with the provisions of the contract or order. 3.7.7 Vibration
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SJ20593-96
The vibration isolator should be able to work normally after the vibration environment condition test specified in GJB 150.16 (see 4.6.19). If there are other requirements, it shall be implemented in accordance with the provisions of the contract or order. 3.7.8 Impact
The vibration isolator shall be able to work normally after the shock environment condition test specified in GJB150.18 (see 4.6.20). If there are other requirements, they shall be implemented in accordance with the provisions in the contract or order. 3.8 Vibration resistance
The vibration isolator shall be able to withstand 5×10° fatigue vibration tests in a normal working environment. After the test, the vibration isolator structure is intact, without broken wires and permanent deformation that affects product performance: the fasteners are not loose or damaged (see 4.6.21). 3.9 Dimensions and weight
The structural dimensions and weight of the vibration isolator under no-load conditions shall comply with the requirements of the table drawings. The structural dimensions and weight of the T-type vibration isolator are shown in Appendix A (supplement)
3.10 Marking
3.10.1 Each vibration isolator shall be marked, and the marking text and trademark pattern shall be clear and eye-catching. 3.10.2 The mark shall be placed in an easily identifiable position, not easily worn, and shall be able to be preserved for a long time. 3.10.3 The marking content shall include:
Contractor name:
b. Product name;
Business building;
d. Product model;
Manufacturing period.
3.11 Appearance
3.11.1 The elastic body part composed of steel wire rope shall be arranged evenly, with bright surface and no rust spots. There shall be no creases, protrusions, scratches, broken wires and exposed steel wire taps. The twisting tightness between each strand shall be uniform. 3.11.2 The surface of the fixed clamping plate shall be smooth, without burrs, brittle skin, rust spots, mechanical scratches, and the protective layer shall be fine, uniform and uniform in color.
3.11.3 All parts shall be firmly assembled and arranged neatly. The vibration isolator shall be free of rust and assembly dislocation. 4 Quality Assurance Provisions
4.1 Inspection Responsibility
Unless otherwise specified in the contract or order, the contractor shall be responsible for completing all inspections specified in this specification. The ordering party or the superior appraisal agency has the right to inspect any inspection item described in the specification when necessary. 4.1.1 Qualified Responsibilities
All products must meet all requirements of Chapter 3 and Chapter 5 of this specification. The inspections specified in this specification shall become an integral part of the contractor's entire inspection system or quality system. If the contract includes inspection requirements not specified in this specification, the contractor shall ensure that the products submitted for acceptance meet the contract requirements. Quality consistency sampling does not allow the submission of products that are known to be defective, nor can the ordering party be required to accept defective products. 4.2 Inspection Classification
The inspections specified in this specification are divided into:
a. Appraisal inspection (type finalization inspection)
b. Quality consistency inspection.
4.3 Test Conditions
SI 20593-96
Except for special provisions or corresponding tests in accordance with 3.7 of this specification, all other tests shall be carried out under the "standard atmospheric conditions for the test" specified in 3.1.1 of GJB150.1. 4.4 Identification test (type test)
4.4.1 Test items
The test items and sequence shall be carried out in accordance with Table 1. 4.4.2 Number of samples
The weekly fixed number of samples shall be adopted. The number of samples submitted for identification test for the same model and specification of vibration isolators is 6. 4.4.3 Qualification criterion
If 4 of the samples pass all the test items specified in Table 1, they are qualified. If the sample submitted for identification test fails in the test When a fault occurs or a certain item fails to meet the specified requirements, the test should be stopped. After the cause of the fault is found, the fault is eliminated and an analysis report is submitted, the appraisal can be re-conducted after approval by the quality appraisal unit. 4.4.4 Maintenance of qualification for appraisal
Unless otherwise specified in the contract or order, the contractor shall provide quality certification. 4.5 Quality consistency inspection
4.5.1 Inspection items
The inspection items and sequence shall be as specified in Table 1. Table 1 Inspection items and sequence
Inspection or test
Dimensions and weight
Static load-deformation characteristics
Bearing mass
ValueResponse frequency
Peak amplification factor| |tt||Vibration transmissibility
Impact transmissibility
Maximum dynamic deformation
Maximum impact force
Maximum input energy
Required
Qualification number
Inspection or test
Test method
Chapter number
Identification inspection
Quality consistency inspection
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Inspection or test
Acceleration
Vibration resistance characteristics
Xiang\V\-
Required
Micro-article number
Items to be inspected;
Items not to be inspected:
4.5.2 Composition of inspection lot
SI2059396wwW.bzxz.Net
Continued Table 1
Strip number of inspection or test method
Identification inspection
Quality consistency inspection
Vibration isolators submitted to the same inspection lot should be products manufactured in the same production cycle with the same design, the same materials and the same process. The composition of the inspection lot shall comply with the provisions of Article 3.6 of GJB179. 4.5.3 Inspection grouping
The quality consistency inspection is divided into Group A, Group B, Group C and Group D. The inspection cycle of Group C and Group D is determined according to the production batch and the provisions of the contract or order.
4.5.4 Inspection of Group A
4.5.4.1 Inspection items
The inspection items of Group A shall comply with the provisions of Table 1.
4.5.4.2 Sampling plan
100% of the inspection batches submitted by the contractor shall be subject to Group A inspection. 4.5.4.3 Qualification criteria
The defect classification and the acceptable number of minor and major defects shall be specified in the product specification or contract. According to the inspection results, if the number of defects is equal to the specified value, the batch is judged to be qualified for Group A inspection; otherwise, the batch is judged to be unqualified for Group A inspection. No fatal defects are allowed in Group A inspection. If fatal defects are found at a glance, the batch shall be rejected. 4.5.5 Group B inspection
Group B inspection shall be carried out on products that have passed Group A inspection. 4.5.5.1 Inspection items
Group R inspection items shall be in accordance with the provisions of Table [.
4.5.5.2 Sampling plan
Unless otherwise specified, Group B inspection shall be carried out according to the normal sampling plan specified in GIB179, and samples shall be randomly selected. Inspection level II. is general inspection level II, and the acceptable quality level AQL is 4.04.5.5.3 Qualification criteria
According to the inspection results, if the number of defects is less than or equal to the specified value, the batch is judged to be qualified for the B group inspection; otherwise, the batch is judged to be unqualified for the B group inspection.
4.5.5.4 Re-inspection
SJ20593-96
For the batch that fails the R group inspection, the contractor shall analyze the batch of products, find out the cause of the defects, and take corrective measures before resubmitting it for the B group inspection. When resubmitting the inspection, the resubmitted batch shall be separated from the new batch and marked as "resubmitted batch", and stricter inspection shall be adopted.
If the re-inspection is qualified, the batch is judged to be qualified; otherwise, the batch is still judged to be unqualified. 4.5.6 C group inspection
4.5.6.1 Inspection items
The C group inspection items shall be in accordance with the provisions of Table 1.
4.5.6.2 Sampling
Unless otherwise specified, for Group C inspection, 3 samples shall be randomly selected from the samples that have passed the Group F inspection. 4.5.6.3 Qualification Criteria
According to the inspection results, if 2 samples pass the inspection, the batch of Group C inspection shall be judged to have passed; otherwise, the batch of Group C inspection shall be judged to have failed.
4.5.6.4 Inspection Cycle
The interval of Group C inspection shall be determined according to the production batch and the provisions of the contract or order. 4.5.7 Group D Inspection
4.5.7.1 Inspection Items
The inspection items of Group D shall be in accordance with the provisions of Table 1.
4.5.7.2 Sampling Plan
Unless otherwise specified, for Group D inspection, 3 samples shall be randomly selected from the samples that have passed the Group B inspection. 4.5.7.3 Qualification criteria
According to the inspection results, if 2 samples are qualified, the batch of Group D inspection is judged to be qualified; otherwise, the batch of Group D inspection is judged to be unqualified.
4.5.7.4 Inspection cycle
The period of group inspection shall be determined according to the production batch and the provisions of the contract or order. 4.5.8 Unqualified
If the sample fails the inspection of Group C or Group D, the acceptance and delivery of the product shall be stopped. The contractor shall notify the qualified appraisal unit of the unqualified situation. After taking corrective measures, all tests or inspections shall be carried out again according to the opinions of the qualified appraisal unit, or only the unqualified items shall be tested or inspected, but stricter inspections must be adopted. If the inspection is still unqualified, the unqualified situation shall be notified to the qualified appraisal unit. 4.6 Inspection method
4.6.1 Materials
The selected materials shall meet the product performance requirements by checking the product drawings and material lists. 4.6.2 Design
Verify the isolator design by checking the product drawings. 4.6.3 Structure
Inspect according to the product drawings.
4.6.4 Static load-deformation characteristics
4.6.4.1 According to the deformation characteristics of the vibration isolator in the main load-bearing direction, design appropriate test equipment, fix the vibration isolator test sample on the workbench of the tension and compression test machine, 4.6.4.2 Pre-deform the test sample three times, the pre-deformation stroke is about one-third of the effective deformation stroke of the vibration isolator elastic body TTTKAONTKAca-
, and the pre-deformation speed is not more than 6mm/minSI20593-96
4.6.4.3 Apply loads from small to large to the test sample from zero load until the deformation reaches about two-thirds of the maximum dynamic deformation of the vibration isolator. Stop applying loads. Record the load-deformation characteristics (usually expressed by a curve) during the above continuous loading process, or evenly select and record the load-deformation values of not less than 20 points. The deformation speed is not more than 8mm/min, and the loading speed value should be kept constant, and no reciprocating pauses should be allowed during the loading process. Repeat the above process four times and take the average value as the static load-deformation characteristic of the test sample. 4.6.5 Bearing mass
4.6.5.1 After obtaining the static load-deformation characteristic of the vibration isolator according to the method in 4.6.4, convert the static load value corresponding to the deformation of 0.5mm into mass as the lower limit of the bearing mass range of the vibration isolator. 4.6.5.2 After obtaining the static load-deformation characteristic of the vibration isolator according to the method in 4.6.4, convert the static load value corresponding to the deformation of one-fourth of the maximum dynamic deformation of the vibration isolator into mass as the upper limit of the bearing mass range of the vibration isolator. 4.6.6 Value response frequency
4.6.6.1 In the basic excitation mode, fix the vibration system consisting of the bearing mass and the vibration isolator test sample on the sinusoidal vibration test table, connect the vibration measurement instruments and meters to form a vibration measurement system. 4.6.6.2 See Table 2 for test values and test duration. Table 2
Test model
Excitation frequency
2~38Hz
38~200H
Excitation amplitude
0.6±0.12mm
34 ±6.8m/s2
Test duration
2 -200—2Hz
4.6.6.3Use a sine signal to perform continuous basic sweep excitation on the vibration table surface, and measure the frequency corresponding to the maximum amplitude of the vibration response obtained by the sweep frequency, which is the peak response frequency. 4.6.6.4When specified in the contract or order, the inspection can also be carried out in accordance with Article 6.8.3 of S/T10179. 4.6.6.5When specified in the contract or order and conditions permit, the vibration isolation system can be subjected to random vibration excitation in accordance with the provisions of GJB150.16, and the dominant frequency of the system response spectrum can be measured as the peak response frequency of the isolation system. 4.6.7 Peak amplification factor
4.6.7.1 According to the methods in 4.6.6.1~4.6.6.4, the vibration isolation system is subjected to basic sinusoidal sweep excitation, and the response amplitude corresponding to the peak response frequency point and the excitation amplitude at the same frequency point are measured, then: Af)
Where: 8——Peak amplification factor:
Ao（f,)--excitation amplitude at the peak response frequency point, mm; A,(f,)--response amplitude at the peak response frequency point, mm. ..()
4.6.7.2 When specified in the contract or order and conditions permit, the vibration isolation system may be subjected to random vibration excitation according to the method specified in 4.6.6.5. The amplitude corresponding to the dominant frequency point on the system response spectrum density curve is measured and the amplitude corresponding to the input spectrum at the same frequency point, then:
Where: 3——Peak amplification factor:
SI 20593-96
X(fn)—excitation amplitude at the dominant frequency point, mm; Y(f,)——response amplitude at the dominant frequency point, mm. 4.6.8 Vibration transmissibility
4.6.8.1 Perform basic sinusoidal sweep excitation on the vibration isolation system according to methods 4.6.6.1~4.6.6.4. Record the excitation amplitude and response amplitude corresponding to each excitation frequency point, then: w(fi) =
Where: ()—vibration transmissibility corresponding to the excitation frequency point f; A(f)—excitation amplitude corresponding to the excitation frequency point f:, mm; A,(f)——response amplitude corresponding to the excitation frequency point :, mm. .(3)
4.6.8.2 When specified in the contract or order and conditions permit, the vibration isolation system may be subjected to random vibration excitation according to the method specified in 4.6.6.5. The system response spectrum is measured, and the ratio of the root mean square of the response spectrum to the input spectrum is: () =EyD
YE[(?()]
Where: \f) Vibration transmissibility function of the vibration isolation system: E[()]——mean square value of the corridor spectrum density of the vibration isolation system; EE2(f))——mean square value of the response spectrum density of the isolation system. 4.6.9 Shock transmissibility
4.6.9.1 The vibration isolation system consisting of the load-bearing mass and the vibration isolator shall be firmly installed on the shock test bench, and the shock measuring instruments shall be connected to form a shock measuring system: 4.6.9.2 The vibration isolation system shall be subjected to functional shock test according to the environmental conditions specified in 6.5.3 of SJ/T10179. 4.6.9.3 Record the peak value of the excitation acceleration and the peak value of the response acceleration in the same impact, then a
Where: .-Impact transmission rate:
al--impact response acceleration peak value, m/s: eo
impact velocity peak value, m/s2.
4.6.10 Maximum dynamic deformation
Test by drop hammer test method (Figure)
Before deformation
After deformation
1---Falling mass: 2-Vibration isolator;
Figure 1 Drop hammer test model
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SJ20593-96
4.6.10.1 Select an appropriate drop hammer mass within the load-bearing mass range of the test sample, and perform a drop hammer test on the vibration isolator according to the drop hammer height calculated based on the theoretical maximum input energy (energy capacity) of the test sample. For the calculation method, see Appendix B (reference).
4.6.10.2 Observe whether the vibration isolator produces rigid collision during the drop hammer process. Adjust the drop hammer height gradually to make the vibration isolator reach the maximum dynamic deformation state (with no rigid collision as the limit). 4.5.10.3 The number of drop hammer tests shall not be less than 3 times. Use measuring tools to measure the free space size of the vibration isolator in the force direction after each adjacent drop hammer test. When the difference between the free space size of the vibration isolator in the force direction measured by two adjacent tests is not greater than ± 5% of the free space size measured by the latter test, the free space size measured by the latter test is the maximum dynamic deformation value.
4.6.11 Maximum impact force
Perform a drop hammer test on the test sample according to the method in 4.6.10. The maximum impact load value of the test sample at the maximum dynamic deformation recorded by the impact measuring instrument is the maximum impact force value. 4.6.12 Maximum input energy (energy capacity) The test sample is subjected to a drop hammer test according to the method in 4.6.10. The drop hammer height value at the maximum dynamic deformation of the vibration isolator is measured by a length measuring tool. The maximum input energy (energy capacity) is: E. = Mg(h + A)...
Where: E maximum input energy (energy capacity), J; M—drop hammer mass, kg;
g—gravitational acceleration, m/s\;
h—drop hammer height, m;
A—maximum dynamic deformation value of the vibration isolator, m.
4.6.13 High temperature
Perform the test method specified in GIB 150.3. 4.6.14 Low temperature
Perform the test method specified in GJB 150,4. 4.6.15 Condensation heat
Perform the test method specified in GJB 150.9. 4.6.16 Bacteria
Perform the test method specified in GJB 150.10. 4.6.17 Salt spray
Perform the test method specified in GJB 150.11. 4.6.18 Acceleration
Perform the test method specified in GIB 150.15. 4.6.19 Vibration
Perform the test method specified in GIB 150.16. 4.6.20 Impact
Perform the test method specified in GIB 150.18. 4.6.21 Vibration resistance characteristics
The test model is shown in Table 3. The vibration isolator is subjected to an enhanced frequency sweep test according to the following test method. Observe whether the vibration isolator has damaged rings, whether the wire rope has broken wires or permanent deformation, whether the fasteners are loose or damaged, and whether the structural dimensions have changed significantly. 10
SJ20593—96
Excitation method: Sine wave basic excitation is applied to the vibration isolation system; excitation amplitude: 16m/s;
Frequency domain range: 10～500Hz;
Sweep speed: 1.06× 10-6, FHz/s (f: sweep frequency Hz); total sweep time: 25h, which can be carried out in sections. 4.6.22 Dimensions and weight
Use general measuring tools and scales to check the dimensions of each part and the weight of the vibration isolator. 4.6.23 Marking
Use visual inspection to check the markings of the vibration isolator.
4.6.24 Appearance quality
Use visual inspection to check the appearance quality of the vibration isolator. 4.6.25 Packaging
Use visual inspection to check the product packaging and transportation packaging of the vibration isolator. 5 Delivery preparation
5.1 Packaging and marking
5.1.1 Product packaging
5.1.1.1 After the vibration isolator is packed in plastic, it is packed in a cardboard or wooden packaging box (box). 5.1.1.2 Only products of the same model are packed in the same packaging box (box), and the product inspection certificate and installation instructions are attached. 5.1.1.3 The outside of the packaging box (box) should be marked with the product name, model, quantity, safety protection mark, manufacturer name and manufacturing date (or production batch number).
5.1.2 Marking
5.1.2.1 A packing list should be attached to the packaging box (box). 5.1.2.2 The outside of the packaging box (box) should be marked with a safe storage and transportation icon and comply with the provisions of GB191. The name and address of the consignee and consignor should also be indicated.
5.2 Transportation
The vibration isolator can be transported in any way.
5.3 Storage
5.3.1 The vibration isolator should be stored without external load. 5.3.2 The vibration isolator should be able to be stored for a long time, and the appearance should be inspected once every ~~ years. 5.3.3 During the storage period, the vibration isolator should take measures to prevent moisture, fire, acid, alkaline gas and liquid corrosion. 6.1 Intended use
The vibration isolators conforming to this specification are intended to be used for the control of vibration, impact and structural noise of military electronic and mechanical industrial products such as spacecraft, aircraft, tanks, armored vehicles, field communication equipment, surface ships, submarines, missile transportation and launch systems, nuclear weapon equipment facilities, nuclear power plants, underground civil air defense projects, anti-bandit construction engineering facilities, etc. 6.2 Contents of order documents
The following contents shall be stated in the contract or order: the name and number of this specification;
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