GB/T 47451-2026Pressure environment test methods for the sealed cabins of manned spacecraft (English PDF)

7 Test Conditions

7.1 Pressure relief and repressurization test The requirements for the pressure relief and repressurization test conditions are as follows:

a) Normal depressurization and repressurization conditions should be set up, and the normal depressurization and repressurization process should be verified;

b) Failure modes that significantly affect the depressurization and repressurization processes should be identified, and corresponding failure conditions should be set to verify the performance under these failure modes. Depressurization and repressurization process;

c) Normal operating conditions should be tested first, followed by fault operating conditions.

7.2 Emergency Pressure Test of Sealed Chamber The requirements for the emergency pressure test of the sealed chamber are as follows:

a) The simulated leak diameter should at least cover the hull leak diameter determined by conditions such as maintenance time requirements, gas inventory, and pluggability. Upper limit. The number and size of simulated leaks should be determined based on design requirements and experimental resource constraints to obtain the chamber pressure descent rate. The rate and pressure are trending downward.

b) The no-pressure test should be performed first (to obtain the rate of pressure drop and the pressure drop trend), followed by the pressure-maintaining test (to obtain the pressure maintenance data). (The time during which the total pressure of the sealed chamber is not lower than the required value).

c) For both non-air-replenishing and air-replenishing operating conditions, a small-diameter leak test should be performed first, followed by a large-diameter leak test.

7.3 Emergency depressurization test of the sealed chamber The requirements for the emergency depressurization test of the sealed chamber are as follows:

a) The initial total pressure of the sealed chamber should at least cover the upper limit of the normal control range of total pressure;

b) If conditions such as test progress and gas supply permit, other initial total pressure conditions may be set as needed;

c) The upper limit of the normal control range of total pressure should be tested first, and then other initial total pressure conditions should be tested.

7.4 Sealed Chamber Pressure Control Test The requirements for the pressure control test conditions of the sealed chamber are as follows:

a) A test should be conducted to determine if the total pressure exceeds the allowable upper limit and to check the automatic pressure relief function when the total pressure exceeds the upper limit.

8 Test Procedure

8.1 Experimental Preparation The main tasks and requirements for the test preparation phase are as follows:

a) Analyze the test system's capabilities based on the test inputs, develop a test plan for the pressure environment of the sealed chamber, and conduct joint debugging tests if necessary. verify;

b) The instruments and meters with metrological attributes used in the sealed chamber test system and ground test system must have been calibrated and certified by the metrology department. Use within the validity period;

c) Check the status of the environmental simulation equipment and pressure control system of the ground test system to ensure they are working properly, and perform a leak rate test on the pressure control system. Test to ensure that design requirements are met;

d) Confirm that the leak rate of the sealed chamber meets the requirements, check the status of the sealed chamber test system, and ensure that it is working properly;

e) Hoist the entire device into the space environment simulation chamber, connect it to the test support, and secure it firmly;

f) Connect the test cables and conduits, and perform sealing tests and checks on the ground test system;

g) Conduct pre-test condition checks on the sealed chamber test system and the ground test system;

h) Close the door to the space environment simulation chamber and begin the experiment.