低温气动阀的人机环境可靠性评估方法

The man-machine-environment reliability evaluation method of cryogenic pneumatic valve

为了在液体火箭发动机试验过程中全面定量识别低温气动阀故障产生根源,针对低温气动阀可靠性分析过程的动态时变问题,首先通过引入人机环境系统工程理论,结合低温气动阀工作原理,从人机环境方面分析低温气动阀可靠性影响因素,建立基于人机环境系统工程的低温气动阀时变可靠性模型;并在此基础上,通过从人机环境范围定量分析低温气动阀的可靠度与失效率,对低温气动阀可靠性薄弱环节进行评估。最后通过具体的应用实例验证了该方法的有效性与准确性,为定量分析和改进低温气动阀可靠性提供了一种方法指导,为提高液体火箭发动机性能准确客观评价以及研制提供了支撑。

In order to determinate the faults source of the cryogenic pneumatic valve in the process of liquid rocket engine test and to solve the dynamic time varying problem existing in reliability analysis of cryogenic pneumatic valve, the reliability influencing factors of the cryogenic pneumatic valve were analyzed in the aspect of man-machine-environment, and the man-machine-environment-based time-varying reliability model of cryogenic pneumatic valve was constructed by means of the man-machine-environment system engineering theory and the operating principle of the cryogenic pneumatic valve. On the basis of this model, the reliability degree and fault rate of the cryogenic pneumatic valve were quantitatively analyzed in the range of man-machine- environment, and the vulnerable spots of cryogenic pneumatic valve are evaluated. Finally, this method＇s effectiveness and accuracy were demonstrated and validated by an example. Consequently, this method highly provided an approach for the quantitative analysis and reliability improvement of the cryogenic pneumatic valve, and a support for objective evaluation of liquid rocket engine performance.