【作者】 董玉革； 高亮； 祁型红；

【Author】 Dong Yuge(School of Mechanical & Automotive Engineering, Hefei University of Technology, Anhui, Hefei, 230009)

【机构】 合肥工业大学机械与汽车工程学院； 武汉理工大学机电学院；

【摘要】 针对传统可靠性分析中数据缺乏的难题,研究了用模糊变量表示不确定性信息时的可靠性分析方法。首先给出了应力和强度均为线性概率密度函数时,应用传统可靠性理论中的应力强度干涉模型,计算出了失效概率;其次通过把强度或应力变换为模糊变量,计算出了与第一种方法相同的失效概率;最后同时把强度和应力变换为模糊变量,计算失效概率,并与前两种方法计算的结果相比较,得到了一些重要的结论。更多还原

【Abstract】 In consideration of the shortage of data in reliability analysis, a reliability analysis method is studied by expressing uncertain information in fuzzy variables. Firstly, the failure probability is computed based on the stress-strength interference model of convectional reliability theory when the probability density functions of both stress and strength are random variables subjected to linear distribution. Secondly, the failure probability is computed by transforming the random strength or the random stress to a fuzzy strength or a fuzzy stress. Finally, the failure probability is computed by transforming both the random strength and the random stress to the fuzzy variables, and computed failure probabilities are compared by using different methods. Therefore, some conclusions are obtained.更多还原