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China State Shipbuilding Corporation Department Standard
CB1235-93
Torpedo Environmental Conditions and Test Methods
1994-02-01 Issued
China State Shipbuilding Corporation Issued
1994-08-01 Implementation
1 Scope
1.1 Subject Content
China State Shipbuilding Corporation Department Standard
Torpedo Environmental Conditions and Test Methods
CB1235-93
Classification Number: U74
This standard specifies the general environmental conditions and test methods for environmental tests during the design finalization, production finalization and batch production sampling inspection.
1.2 Scope of Application
This standard applies to air-dropped torpedoes, rocket-assisted torpedoes, and surface and underwater torpedoes. 1.3 Application Guide
According to the characteristics of torpedo products and the specific conditions of existing environmental test equipment in China, the contractor may allow the environmental test items specified in this standard to be tailored within a certain range according to the requirements of the technical conditions of each component when compiling the product environmental test outline. When environmental tests are required for design finalization and production finalization, they can be carried out in the following order: a.
Low temperature test;
High temperature test;
Temperature change test;
Alternating damp heat test;
Mold test;
Salt spray test;
Impact test;
Vibration test;
Constant acceleration test.
Note: ①The order of impact test, vibration test and constant acceleration test can be interchanged. When the temperature change test is selected, the storage test in the low temperature test and high temperature test can be omitted. ③When the production sampling inspection is carried out, refer to it. 2 References
High temperature test
GJB150.3—86
6 Environmental test methods for military equipment
GJB150.4-86
Environmental test methods for military equipment
Low temperature test
GJB150.16--86 Environmental test methods for military equipment Vibration test 3 Definitions
3.1 Non-operating state
Equivalent to the state of a torpedo that is assembled or disassembled and is in storage, transportation or loading and unloading. 3.2 Ready state
Equivalent to the state of a torpedo that is assembled, debugged and qualified according to technical conditions, installed in the launch device, and before launching. 3.3 Working state
Approved by China State Shipbuilding Corporation on February 1, 1994 and implemented on August 1, 1994
Equivalent to the state when it is performing its function. 3.4 Test direction
CB1235-93
The three mutually perpendicular axes X, Y, and Z correspond to the longitudinal axis (OX), vertical axis (OY), and transverse axis (OZ) of the torpedo, as shown in Figure 1.
Figure 1 Test direction
3.5 Dangerous frequency
The resonant frequency and the frequency at which the test sample fails, malfunctions, or has serious performance deviations due to vibration. 4 General requirements
4.1 Purpose of torpedo environmental test
The torpedo environmental conditions of this standard refer to accelerated artificial environmental test conditions that simulate the natural environment under artificial control conditions. These environmental conditions are formulated by classifying, analyzing and strengthening all external factors that may be encountered during the actual storage, transportation, loading and unloading, carrying and operation of the torpedo, so as to assess and evaluate the adaptability and structural integrity of the torpedo to environmental conditions such as high temperature, low temperature, alternating damp heat, temperature change, salt spray, mold, impact, vibration, constant acceleration, etc. within a limited time. 4.2 Requirements for test equipment
The test instruments and equipment used in the test should be within the validity period of their verification, and their technical parameters should meet the requirements specified in the product specifications.
4.3 Test records
The test records include:
Test product identification mark;
Test date;
Test undertaking unit;
Test conditions;
Test process record;
Fault record;
Test person in charge, participants, and recorder; Laboratory environmental conditions;
Instruments and equipment.
Test report
Cover content
Title;
Test sample identification mark and number;
Name of the person in charge of the test:
Compilation, verification, review and signature;
Report date.
4.4.2 Report content
Test sample code;
Test completion date;
Test purpose;
Name of the test unit;
Test record;
Test results and test evaluation opinions; Test instruments and equipment;
Test participants.
Detailed requirements
For the climatic environment test of torpedoes, see the Method 100 series. For the mechanical environment test of torpedoes, see the Method 200 series. CB1235-93
1 Test purpose
CB1235--93
Method 101
Low temperature test
To assess the adaptability of components used to assemble torpedoes for storage, transportation and operation under low temperature conditions. 2 Test conditions
2.1 Working test temperature
The working test of surface and underwater torpedoes and air-dropped torpedoes is carried out under 0℃ conditions. 2.2 Insulation temperature of working test
Surface and underwater torpedoes: 0℃,
Air-dropped torpedoes and assisted torpedoes: -18℃; the allowable temperature error is ±2℃.
2.3 Storage test temperature
Surface and underwater torpedoes: -30℃; b.
Airdropped torpedoes and assisted torpedoes: -40℃;
The allowable temperature error is ±2℃.
2.4 Test time
Working test time: not less than the full voyage time of the torpedo or a complete working cycle of the test sample; b.
Insulation time for working test: 1h;
Storage test time: 24h.
3 Requirements for test equipment
3.1 The test chamber should be able to provide the temperature specified in Chapter 2 within its effective working space, and it is allowed to use strong air circulation to maintain temperature uniformity.
3.2 In order to limit radiation, the temperature difference between the entire inner wall of the test chamber (room) and the test temperature shall not exceed 8% of the test temperature (calculated by K value).
3.3 Two boxes, A and B, should be prepared for the test.
4 Test procedure
4.1 Pretreatment
Place the test sample under normal atmospheric conditions to achieve temperature stability. 4.2 Initial inspection
Perform visual inspection, electrical and mechanical performance inspections on the test sample in accordance with product specifications. 4.3 Working test
4.3.1 The test sample is in a preparatory state without packaging and power supply, and is placed in the A test box (chamber) as close to the actual placement state of the torpedo as possible. Then, the temperature of the A box (chamber) is lowered to the temperature specified in Article 2.2 at a rate not exceeding 1C/min, and is kept warm in accordance with the provisions of 2.4b.
4.3.2 After low-temperature insulation, the test sample is taken out of the A box and moved into the B test box (chamber) which has been kept at a constant temperature in accordance with the provisions of Article 2.1, so as to conduct a working status inspection. The process of taking out and moving in the test sample shall not exceed 3 minutes, and the test time shall be in accordance with the provisions of Article 2.4. 4.4 Storage test
CB1235-93
4.4.1 After the working test, place it at room temperature for 1 to 2 hours to allow it to reach temperature stability. 4.4.2 Place the test sample in the A test box (chamber) again, and reduce the temperature to the temperature specified in Article 2.3 at a rate not greater than 1C/min, and keep it warm according to the provisions of 2.4c.
4.4.3 If the test sample has reached the end of its service life after the working test, no low-temperature storage test will be carried out. 4.5 Recovery
After the test, place the test sample under normal atmospheric conditions for recovery for 2 hours to allow it to reach temperature stability. 4.6 Final inspection
Perform appearance inspection, electrical performance and mechanical performance inspection on the test sample in accordance with the relevant product specifications. 4.7 Test interruption
4.7.1 Interruption due to insufficient test conditions
If the test is interrupted, when the test temperature is higher than the specified test temperature, the temperature should be adjusted to stabilize at the specified test temperature again, and the test will continue from the interruption point until the scheduled test time is completed. The interruption time shall not be included in the test time. 4.7.2 Interruption of test conditions
If the test temperature is lower than the specified test temperature when the test is interrupted, the test should be stopped and the test sample should be subjected to comprehensive mechanical and electrical performance tests. If the test results are normal, the test sample will stabilize at the specified test temperature again and the test will continue from the interruption point. The interruption time will not be included in the test time. If the state of the test sample is abnormal when the test is interrupted, the test must be restarted after the normal working state of the test sample is restored. If the test is continued and the test sample fails or the final test performance exceeds the tolerance, the test is invalid. 5 Conformity assessment
After the low-temperature test, the various properties of the test sample should meet the requirements of the product specification. Method 102
High-temperature test
1 Test purpose
To assess the adaptability of components used to assemble torpedoes for storage, transportation and operation under high temperature conditions. 2 Test conditions
2.1 Test temperature
a. Working test temperature: 37℃ (submarine launch: 30℃); b. Insulation temperature of working test: 60℃, storage test temperature: 60℃ (relative humidity not more than 15%); c.
d. The allowable temperature error is ±2℃.
2.2 Test time
a. Working test time: not less than the full voyage time of the torpedo or a complete working cycle of the test sample; b. Insulation time of working test: 1h;
Storage test time: 24h.
3 Requirements for test equipment
3.1 The working space of the test box (room) should be able to provide the temperature specified in Article 2.1, and forced ventilation can be used to keep the temperature of the working space of the test box (room) uniform.
3.2 In order to limit radiation, the temperature difference between the entire inner wall of the test box (room) and the test temperature shall not exceed 5% of the test temperature (calculated according to the K value).
CB1235-93
3.3 The absolute humidity of the test box (room) shall not exceed 20g/m (equivalent to 50% relative humidity at 35°C). 3.4 Prepare two test boxes (rooms) A and B. 4 Test procedurewwW.bzxz.Net
4.1 Pretreatment
Place the test sample under normal atmospheric conditions to achieve temperature stability. 4.2 Initial inspection
Perform visual inspection, electrical performance and mechanical performance inspection on the test sample in accordance with the product specifications. 4.3 Working test
4.3.1 The test sample is in an unpackaged and unpowered preparation state, and As far as possible, place the torpedo in the A test box (chamber) in the same state as when it is actually used, and then raise the temperature of the A box (chamber) to the temperature specified in 2.1b. at a rate not exceeding 1°C/min, and keep it warm in accordance with the provisions of 2.2b.
4.3.2 After high-temperature insulation, take the test sample out of the A box (chamber) and move it into the B box (chamber) which has been kept at a constant temperature in accordance with the provisions of 2.1 to conduct a working status inspection. The process of taking out and moving in the test sample shall not exceed 3 minutes, and the test time shall be in accordance with the provisions of 2.2a. 4.4 High-temperature storage test
4.4.1 After the working test, place it at room temperature for 2 hours to allow it to reach temperature stability. 4.4.2 Place the test sample in the A test box (chamber) again, and raise the temperature to 2. The specified temperature in Article 1 shall be maintained for the time specified in 2.2c.
Note: After the working test, the high-temperature storage test will no longer be carried out if the service life of the test sample has ended. 4.5 Recovery
After the test, the test sample shall be placed under normal atmospheric conditions for recovery to allow it to reach temperature stability. 4.6 Final inspection
According to the relevant product specifications, the test samples shall be inspected for appearance, electrical properties and mechanical properties. 4.7 Test interruption
4.7.1 Interruption due to insufficient test conditions
If the test is interrupted and the test temperature is lower than the specified test temperature, the test shall continue from the interruption point and the interruption time shall not be included in the test time.
4.7.2 Interruption due to excessive test conditions
If the test is interrupted, If the test temperature is higher than the specified test temperature, the mechanical and electrical properties of the test sample shall be tested. If the test results are normal and the test sample stabilizes at the specified temperature again, the test shall continue from the interruption point. The interruption time shall not be included in the test time. If the test sample fails or the final test performance exceeds the tolerance when the test is continued, the test shall be invalid. If the state of the test sample is abnormal when the test is interrupted, the test must be restarted after the normal working state of the test sample is restored. 5 Qualification assessment
After the high temperature test, the various properties of the test sample shall meet the requirements of the product specification. Method 103
Temperature change test
1 Test purpose
Assess and evaluate the ability and adaptability of components used to assemble torpedoes to change with ambient temperature. 6
2 Test conditions
2.1. Test temperature
Low temperature TA
Torpedoes launched by surface ships: -30℃; torpedoes launched by submarines: -15℃;
Airdropped torpedoes and assisted torpedoes: -40℃;
The allowable temperature error is ±2℃.
2.1.2 High temperature T
CB1235-93
The high temperature temperature of the components used to assemble various torpedoes is: T=60℃, and the allowable temperature error is ±2℃. 2.2 Temperature change test cycle process is shown in Figure 2. C
2.3 Number of test cycles: 3 times.
3 Requirements for test equipment
Cycle 14h
Figure 2 Temperature change cycle
3.1 The test equipment should be able to provide the temperature specified in Articles 2.1.1 and 2.1.2. The temperature uniformity of the test chamber should comply with the provisions of Article 3.1 of GJB150.3 and GJB150.4.
3.2 The ratio of the volume of the test chamber to the volume of the test sample should not be less than 5:1. 4 Test procedure
4.1 Pretreatment
The test sample is placed under normal atmospheric conditions to achieve temperature stability. 4.2 Initial inspection
According to the relevant product specifications, the test sample shall be inspected for appearance, electrical properties and mechanical properties. 4.3 Test
CB1235-93
4.3.1 The test sample is in a ready state without packaging and power supply, and is placed in the test chamber as far as possible in the placement state of the torpedo in actual use.
4.3.2 Cool down at a rate of no more than 1℃/min for 2h to the temperature specified in Article 2.1.1. 4.3.3 Keep warm for 4h.
4.3.4 Heat up at a rate of no more than 1℃/min for 2h to the time specified in Article 2.1.2 and keep warm. 4.3.5 Keep warm for 4h.
4.3.6 Recover for 2h.
4.3.7 From Article 4.3.2 to Article 4.3.6 constitutes a cycle, and the number of cycles specified in Article 2.3 shall be repeated. 4.4 Final inspection
Perform visual inspection, electrical performance and mechanical performance inspection on the test samples in accordance with the relevant product specifications. 4.5 Test interruption
4.5.1 Interruption due to insufficient test conditions
If the test is interrupted and the test temperature does not exceed the specified test temperature (higher than the specified low temperature or lower than the specified high temperature), the test sample should be stabilized at the specified test temperature again, and the test will continue from the interruption point. The interruption time is not included in the test time.
4.5.2 Interruption due to excessive test conditions
If the test is interrupted and the test temperature exceeds the specified test temperature (lower than the specified low temperature or higher than the specified high temperature), the test sample should be tested for mechanical and electrical properties. If the test results are normal, the test sample should be stabilized at the specified test temperature again, and the test will continue from the interruption point. The interruption time is not included in the test time. If the test sample fails during the test or the performance of the test sample exceeds the tolerance after the test, the test is invalid; if the test is interrupted and the test sample is in an abnormal state during the test, the test must be resumed after the normal state is restored.
5 Conformity assessment
After the temperature change test, the various properties of the test sample shall comply with the product specifications. Method 104
Cyclic damp heat test
1 Test purpose
Assess and evaluate the adaptability of the components used to assemble torpedoes for use, storage, and carrying under damp and hot environmental conditions with cyclic temperature changes. 2 Test conditions
2.1 Test temperature
High temperature stage: 40℃;
b. Normal temperature stage: 25℃;
c. The allowable temperature error is ±2℃.
2.2 Test relative humidity
a. High temperature stage: 93%±3%:
b. Normal temperature stage: 97%±3%.
2.3 Test cycle
Each cycle is 24h. Mechanical products 2~3 cycles, electromechanical products and electronic products 4~6 cycles, other products are determined according to relevant specifications.
3 Requirements for test equipment
CB1235-93
3.1 The selected test chamber should be able to meet the test conditions given in Chapter 2. 3.2 The temperature and humidity in the effective working space should be uniform. The air in the box (room) can flow or stir continuously to maintain the specified temperature and humidity conditions.
3.3 The condensed water in the test box (room) must be continuously removed and cannot be reused. 3.4 The condensed water on the inner wall and top of the test box (room) cannot drip onto the test sample. 3.5 The resistivity of the water used to generate humidity shall not be less than 5002·m. 4 Test procedure
Placement of test samples
The test samples are in a state of preparation without packaging and power supply. There should be an appropriate distance between the test samples in the box (room) and they should not overlap each other. They should be placed in the box (room) as much as possible according to the actual use state. 4.2 Pretreatment
Remove dust and oil from the surface of the test samples, and then place them under normal atmospheric conditions to achieve temperature stability. 4.3 Initial inspection
Perform visual inspection, electrical performance and mechanical performance inspection on the test samples in accordance with the relevant product specifications. 4.4 Test
4.4.1 Heating stage
Raise the temperature and humidity of the test box (room) to the temperature specified in 2.1a. and the humidity specified in 2.2a. within 3±0.5h. The heating rate and temperature tolerance should be within the range specified by the shade in Figure 3. Except for the last 15min, the relative humidity can be no less than 90%. The relative humidity during the heating stage shall not be less than 94%. The temperature and humidity control should cause condensation on the surface of the test samples. 10
Heating ends -2℃
Cooling sheet begins
Figure 3 Alternating wet heat cycle diagram
4.4.2 High temperature and high humidity stage
CB1235-93
When the temperature reaches 40±2℃ and the relative humidity is not less than 90%, it is considered to enter the high temperature and high humidity stage. The total duration of this stage and the heating stage is 12h.
4.4.3 Cooling stage
Within 3.6h, the temperature in the test box (room) is reduced from 40±2℃ to the temperature specified in 2.1b. The temperature is reduced by 7.5℃ in the first 1.5h. During this period, the relative humidity cannot be lower than 90% in the first 15min, and the rest of the time is not lower than 94%. 4.4.4 Normal temperature and high humidity stage
When the temperature in the test box (room) drops to 25±2℃ and the relative humidity is not less than 94%, it can be considered to enter the normal temperature and high humidity stage and remain until the end of the cycle.
4.4.5 Cycle
From 4.4.1 to 4.4.4, it constitutes a cycle. See Figure 3. Test according to the number of cycles specified in 2.3. 4.5 Recovery
After the test is completed, place the test sample under normal atmospheric conditions for recovery so that it can reach temperature stability. 4.6 Final inspection
After the test sample is recovered, the appearance inspection, mechanical properties and electrical properties of the test sample shall be carried out according to the relevant product specifications. 4.7 Test interruption
4.7.1 Interruption due to insufficient test conditions
If the test is interrupted, when the test conditions are lower than the specified test conditions (temperature or humidity is lower than the specified test value), the test should be continued from the last valid complete cycle end point before the interruption. 4.7.2 Interruption due to test conditions
If the test is interrupted, when the test conditions exceed the specified test conditions (temperature or humidity is higher than the specified test value), the test sample shall be tested for mechanical and electrical properties. If the status is normal, the test can be continued under the specified conditions. However, if the test sample fails during the test or the performance index of the test sample exceeds the tolerance during the final test, the test is invalid. If the status is abnormal when the test is interrupted, the test must be restarted after the normal status is restored. 5 Conformity assessment
The various properties of the test sample after the test shall comply with the product specifications. Method 105
Zero bacteria test
1 Test purpose
To determine the degree of mold growth of non-metallic parts, components and assembled circuit boards and non-metallic materials used in torpedoes under mold growth conditions and the surface changes caused by mold to them. 2 Test conditions
2.1 See Table 1 for the test bacteria.
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