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提出随机载荷的纵向分布和横向分布。根据2种分布分析了传统的载荷-强度干涉模型的局限性,指出载荷-强度干涉模型适用于随机载荷作用一次或静态的零件可靠度计算。研究了载荷大小与机械零件平均失效率之间的关系,利用标准载荷计算出随机载荷作用时2种不同分布下的零件可靠度计算模型。基于载荷纵向分布的可靠性模型需要大量的载荷-时间历程样本。当获得的样本数较少时,可以使用基于载荷横向分布的可靠性模型。最后,通过实例证明了提出模型的可用性和合理性,以及区分随机载荷概率密度函数属于何种分布在计算零件可靠度时的重要性。
Proposed longitudinal and transverse distribution of random load. According to the two kinds of distributions, the limitations of the traditional load-strength interference model are analyzed. It is pointed out that the load-strength interference model is suitable for the calculation of the reliability of a part under static load or static load. The relationship between the load size and the average failure rate of mechanical parts was studied. The calculation model of part reliability under two different distributions was calculated by using standard load. Reliability models based on vertical distribution of loads require a large number of load-time-history samples. When the number of samples obtained is small, a reliability model based on lateral load distribution can be used. Finally, the feasibility and rationality of the proposed model are proved by examples. The importance of distinguishing the distribution of random load probability density functions in calculating the reliability of a part is demonstrated.