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刚性收集室是航天器总漏率测试系统的核心设备,但其密封性对测试结果的影响却鲜有研究。本文首先以刚性收集室中的氦气浓度为研究变量,通过建立和求解常微分方程定量得到了氦气浓度随时间变化的数学解析解。其次,通过对比刚性收集室泄漏与不泄漏的理想情形,得到了由于刚性收集室的密封性而导致的测试误差与时间之间的数学表达,并结合具体两例讨论了刚性收集室的密封性对检漏测试结果的影响。研究结果表明:测试结果的相对误差与被测件的泄漏率、累积时间、收集室的密封性以及有效容积均相关。本文的研究结论可以为氦质谱非真空累积检漏法的工程实施提供理论依据。
Rigid collection chamber is the core equipment of spacecraft total leakage rate testing system, but the research on its influence on the test results is seldom studied. In this paper, firstly, the helium concentration in the rigid collection chamber is taken as the research variable, and the mathematical analytical solution of the helium concentration with time is obtained by establishing and solving the ordinary differential equation. Secondly, by comparing the ideal situation of leakage and non-leakage of rigid collection chamber, the mathematical expression between the test error and the time caused by the tightness of the rigid collection chamber was obtained. The sealing performance of rigid collection chamber Impact on leak test results. The results show that the relative error of the test results is related to the leakage rate, accumulation time, the sealing performance of the collection chamber and the effective volume. The conclusion of this paper can provide a theoretical basis for the engineering implementation of non-vacuum cumulative leak detection of helium mass spectrometry.