针对系统的故障树灵敏度分析缺乏统一评价指标的问题,将层次分析法(analytic hierarchy process,AHP)引入故障树分析(fault tree analysis,FTA)中,提出一种FTA-AHP方法生成系统综合灵敏度评价指标。建立了系统故障树可靠性分析模型,并...针对系统的故障树灵敏度分析缺乏统一评价指标的问题,将层次分析法(analytic hierarchy process,AHP)引入故障树分析(fault tree analysis,FTA)中,提出一种FTA-AHP方法生成系统综合灵敏度评价指标。建立了系统故障树可靠性分析模型,并利用传统的灵敏度分析方法计算概率灵敏度、相对灵敏度及结构灵敏度3种指标。结合层次分析法,依据灵敏度分析结果和最小割集种类确定权重系数,开展系统故障树综合灵敏度评价分析。经案例验证显示比较于传统方法,综合灵敏度排序结果重复性更小,考虑因素全面,便于决策者做出判断。综合灵敏度评价模型的生成为系统可靠性分析提供支持。展开更多
With the method of group test, fourty pairs of carburization-quenching gears made from 16NCD13 steel for aerocraft were tested to research the contacting fatigue strength on tooth flank. As a result, the samples of fa...With the method of group test, fourty pairs of carburization-quenching gears made from 16NCD13 steel for aerocraft were tested to research the contacting fatigue strength on tooth flank. As a result, the samples of fatigue life at the moments when the pitting appears and reaches failure criterion were obtained at four stressing levels respectively. The distribution rule of fatigue life were distinguished, and the distribution parameters were estimated by statistical analysis. Based on that, the R-S-N curves with confidence 95% of contacting fatigue on gear tooth flank were evaluated. Therefore, the basic data were provided for the reliability design of the gears and prediction of their life.展开更多
文摘针对系统的故障树灵敏度分析缺乏统一评价指标的问题,将层次分析法(analytic hierarchy process,AHP)引入故障树分析(fault tree analysis,FTA)中,提出一种FTA-AHP方法生成系统综合灵敏度评价指标。建立了系统故障树可靠性分析模型,并利用传统的灵敏度分析方法计算概率灵敏度、相对灵敏度及结构灵敏度3种指标。结合层次分析法,依据灵敏度分析结果和最小割集种类确定权重系数,开展系统故障树综合灵敏度评价分析。经案例验证显示比较于传统方法,综合灵敏度排序结果重复性更小,考虑因素全面,便于决策者做出判断。综合灵敏度评价模型的生成为系统可靠性分析提供支持。
文摘With the method of group test, fourty pairs of carburization-quenching gears made from 16NCD13 steel for aerocraft were tested to research the contacting fatigue strength on tooth flank. As a result, the samples of fatigue life at the moments when the pitting appears and reaches failure criterion were obtained at four stressing levels respectively. The distribution rule of fatigue life were distinguished, and the distribution parameters were estimated by statistical analysis. Based on that, the R-S-N curves with confidence 95% of contacting fatigue on gear tooth flank were evaluated. Therefore, the basic data were provided for the reliability design of the gears and prediction of their life.
