T-S模糊故障树是由一系列具有IF-THEN规则的T-S逻辑门构成的故障树,可以解决复杂系统可靠性分析中故障多态、故障机理不明确、底事件失效率难以精确得知的问题。目前该方法主要分析系统中的功能故障问题。实际中,复杂多态系统内部很多...T-S模糊故障树是由一系列具有IF-THEN规则的T-S逻辑门构成的故障树,可以解决复杂系统可靠性分析中故障多态、故障机理不明确、底事件失效率难以精确得知的问题。目前该方法主要分析系统中的功能故障问题。实际中,复杂多态系统内部很多故障常常会造成性能降级,出现多性能状态,进而系统在不同的故障状态下具有不同的性能可靠性。通过对T-S模糊故障树所表示的系统赋予性能变量及故障多态下的不同性能值,利用统计学中的期望思想,提出一种分析系统故障多态下的性能可靠性方法,以及已知某一底事件或中间事件在故障状态下分析系统性能可靠性的方法。通过对目前大型飞机上常用的航空电子交互式以太网(Avionics full duplex switched ethernet,AFDX)进行分析建树,利用该方法求解系统在多故障状态下的性能可靠性,进行了实例分析。展开更多
As few or no failures occur during accelerated life test,it is difficult to assess reliability for long-life products with traditional life tests.Reliability assessment using degradation data of product performance ov...As few or no failures occur during accelerated life test,it is difficult to assess reliability for long-life products with traditional life tests.Reliability assessment using degradation data of product performance over time becomes a significant approach.Aerospace electrical connector is researched in this paper.Through the analysis of failure mechanism,the performance degradation law is obtained and the statistical model for degradation failure is set up; according to the research on statistical analysis methods for degradation data,accelerated life test theory and method for aerospace electrical connector based on performance degradation is proposed by improving time series analysis method,and the storage reliability is assessed for Y11X series of aerospace electrical connector with degradation data from accelerated degradation test.The result obtained is basically consistent with that obtained from accelerated life test based on failure data,and the two estimates of product＇s characteristic life only have a difference of 8.7%,but the test time shortens about a half.As a result,a systemic approach is proposed for reliability assessment of highly reliable and long-life aerospace product.展开更多
文摘T-S模糊故障树是由一系列具有IF-THEN规则的T-S逻辑门构成的故障树,可以解决复杂系统可靠性分析中故障多态、故障机理不明确、底事件失效率难以精确得知的问题。目前该方法主要分析系统中的功能故障问题。实际中,复杂多态系统内部很多故障常常会造成性能降级,出现多性能状态,进而系统在不同的故障状态下具有不同的性能可靠性。通过对T-S模糊故障树所表示的系统赋予性能变量及故障多态下的不同性能值,利用统计学中的期望思想,提出一种分析系统故障多态下的性能可靠性方法,以及已知某一底事件或中间事件在故障状态下分析系统性能可靠性的方法。通过对目前大型飞机上常用的航空电子交互式以太网(Avionics full duplex switched ethernet,AFDX)进行分析建树,利用该方法求解系统在多故障状态下的性能可靠性,进行了实例分析。
基金supported by National Natural Science Foundation of China (Grant No. 50935002,Grant No. 51075370,Grant No. 51105341)National Hi-tech Research and Development Program of China (863 Program,Grant No. 2007AA04Z409)Civil Aerospace Science and Technology Pre-research Project of China (Grant No. B122006 2302)
文摘As few or no failures occur during accelerated life test,it is difficult to assess reliability for long-life products with traditional life tests.Reliability assessment using degradation data of product performance over time becomes a significant approach.Aerospace electrical connector is researched in this paper.Through the analysis of failure mechanism,the performance degradation law is obtained and the statistical model for degradation failure is set up; according to the research on statistical analysis methods for degradation data,accelerated life test theory and method for aerospace electrical connector based on performance degradation is proposed by improving time series analysis method,and the storage reliability is assessed for Y11X series of aerospace electrical connector with degradation data from accelerated degradation test.The result obtained is basically consistent with that obtained from accelerated life test based on failure data,and the two estimates of product＇s characteristic life only have a difference of 8.7%,but the test time shortens about a half.As a result,a systemic approach is proposed for reliability assessment of highly reliable and long-life aerospace product.
