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分析了旋转对称结构零部件的失效特点以及对称单元数对零部件可靠性的影响,建立了能体现对称单元数的旋转对称结构零部件强度概率密度函数和累积分布函数.分别以随机载荷作用次数和时间为寿命度量指标,建立了随机载荷作用下能够全面体现载荷、强度、对称单元数、寿命指标等参数影响的旋转对称结构零部件时变可靠性模型与失效率计算模型.研究表明:在强度不退化的情况下,旋转对称结构零部件的可靠度也会随着寿命指标(载荷作用次数或时间)逐渐降低,失效率随寿命指标逐渐减小.对于具有相同对称单元的旋转对称结构零部件,随着对称单元数的增加,零部件可靠度会降低且失效率会增大.
The failure characteristics of rotating symmetrical structure components and the influence of the number of symmetrical units on the reliability of the components are analyzed, and the intensity probability density function and cumulative distribution function of the rotational symmetry structure components which can reflect the symmetric unit number are established. And time as the measure of life, the time-varying reliability model and failure rate calculation model of rotational symmetry structure parts under random load are established, which can fully reflect the influence of load, strength, number of symmetrical units and life index etc. The results show that in the In the case of non-degenerate strength, the reliability of components with rotational symmetry structure will also decrease gradually with the life index (the number of times of loading action or time), and the failure rate decreases with the life index.For the rotational symmetry structure with the same symmetry unit zero Components, with the increase of the number of symmetric units, parts reliability will decrease and the failure rate will increase.