载人航天火箭发动机试验过程的低温气动阀脆性分析方法

Cryogenic Pneumatic Valve Brittleness Analysis Method for Manned Rocket Engine during Testing Process

为了在载人航天火箭发动机试验过程中全面定量识别和分析低温气动阀故障产生根源,增强低温气动阀的运行可靠性,根据人-机-环境系统工程,从人-机-环境方面对试验过程的低温气动阀故障影响因素进行分析,并通过引入复杂系统理论的脆性理论,基于低温气动阀异常破坏的脆性机理研究,构建低温气动阀的人-机-环境脆性模型,通过定义低温气动阀脆性因子的风险度和耦合度,提出低温气动阀可靠性的关键影响因素量化确定方法,从人-机-环境方面定量保证低温气动阀的稳定性。最后通过实例验证了该方法的准确性与实用性,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,为载人航天火箭发动机性能准确客观评价以及研制提供支撑。

To conduct comprehensive and quantitative analysis on the cryogenic pneumatic valve characteristics and to satisfy reliability requirement in manned rocket engine testing process , the in-fluencing factors of cryogenic pneumatic valve characteristics were analyzed from aspects of man ( workers ) , machine ( enterprise objective entity ) , and environment ( objective and subjective con-ditions).The brittleness of cryogenic pneumatic valve characteristics was analyzed by brittleness theory of complex system , and a man-machine-environment brittleness model of cryogenic pneumatic valve characteristics was constructed according to the man-machine-environment influencing factors . Based on this model , the risk degree and coupling degree of cryogenic pneumatic valve characteris-tics brittleness factors were defined by the direct and indirect impact of man-machine-environment influencing factors.Finally, effectiveness of the proposed method was verified by a case study .It was shown that the proposed method can improve reliability of cryogenic pneumatic valve , and can provide a support for performance evaluation to manned rocket engine .