共查询到16条相似文献,搜索用时 140 毫秒
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将可靠性优化设计理论、可靠性灵敏度技术和稳健设计方法相结合,讨论了具有任意分布参数的机械零件的可靠性稳健设计问题,提出了可靠性稳健设计的计算方法.把可靠性灵敏度融入可靠性优化设计模型之中,将可靠性稳健设计归结为满足可靠性要求的多目标优化问题.在基本随机参数的前四阶矩已知的情况下,通过计算机程序可以实现具有任意分布参数的机械零件的可靠性稳健设计,迅速准确地得到具有任意分布参数的机械零件的可靠性稳健设计信息。 相似文献
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主动轮是履带车辆底盘系统的重要传动部件,其强度具有一定的不确定性,且在实际运行过程中其强度是随时间逐渐退化。采用Gamma随机过程描述机械零部件的强度退化过程,运用基于随机摄动法和四阶矩理论的可靠性数值分析法,讨论了机械系统零部件随机参数在非正态分布时的灵敏度分析问题,运用矩阵微分法推导了机械零部件随机变量均值和方差的灵敏度计算公式,进而以履带车辆的主动轮为例,运用所提方法进行计算验证,计算结果表明该方法可以有效解决机械零部件强度退化时可靠性的灵敏度分析问题。研究成果可以推广到相关机械可靠性优化设计领域,具有十分重要的实用意义。 相似文献
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基于Pro/E行为建模技术的包装机械零部件优化 总被引:2,自引:2,他引:0
目的将Pro/E行为建模技术应用在包装机械零部件优化设计中,以期得到最优的设计参数。方法简要给出Pro/E行为建模的一般过程,在对插板驱动机构模型建立测量特征、插入运动分析特征及关系分析特征,并进行灵敏度分析。在可行性/优化分析的基础上,优化插板驱动机构中的凸轮大径、小径、凸轮位置及曲柄孔间距离。结果得到了满足设计意图的插板驱动机构模型参数尺寸,圆整后得凸轮大径R为34 mm,凸轮小径r为30 mm,凸轮位置高度H为40 mm,曲柄孔间距离L为91 mm。结论在包装机械零部件优化设计中应用Pro/E行为建模技术,可以大大提升包装机械的设计效率与质量。 相似文献
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在贝叶斯统计理论和结构可靠性优化设计方法的基础上,研究了结构在小样本情况下考虑可靠度可信区间的结构可靠性优化设计问题.将结构可靠度作为随机变量,根据先验信息和样本信息,采用贝叶斯推断技术获得结构可靠度的概率分布,给出了可靠度的点估计及区间估计.建立了考虑可靠度可信区间的结构可靠性优化设计模型,提出了考虑可靠度可信区间的结构可靠性优化设计方法.所提出的方法为解决小样本情况下的结构可靠性优化设计问题提供了新的解决方案.数值算例验证了所提出的结构可靠性优化设计方法的有效性和正确性. 相似文献
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Zhou Yang Unsong Pak Cholu Kwon Yimin Zhang 《Quality and Reliability Engineering International》2023,39(1):454-471
To decrease random parameters’ influence on the drum brake reliability, the reliability-based robust optimization design (RBROD) of the electric vehicle brake is proposed. Based on the assumption that the maximum temperature of the brake cannot exceed the allowable temperature, a performance function model of thermal–mechanical coupling reliability of drum brakes is established by the adaptive Kriging method, and the analysis of reliability sensitivity and RBROD are conducted. The accuracy of the proposed model is verified by temperature measurement experiment under emergency braking condition. The robust optimization design improves the drum brake reliability to 0.99998 and reduce the influence of the design parameters on the reliability, with the absolute values of the reliability sensitivity and the weight of the drum brake are significantly smaller. Therefore, the objectives of reliability design, robustness design, and optimization design are simultaneously achieved by the proposed methods. Besides, the relative error of the proposed method is 0.373%, the number of function evaluations is 39, and the comparison with four meta-model methods show that the proposed method holds high-accuracy and high-efficiency. This study provides a high-precision theoretical explanation for the robust optimization design of drum brake. 相似文献
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Li-Sha Zhu Hao Lu Yi-Min Zhang 《Quality and Reliability Engineering International》2021,37(6):2950-2969
Despite many advances in the field of computational system reliability analysis, estimating the joint probability distribution of correlated non-normal state variables on the basis of incomplete statistical data brings great challenges for engineers. To avoid multidimensional integration, system reliability estimation usually requires the calculation of marginal failure probability and joint failure probability. The current article proposed an integrated approach for estimating system reliability on the basis of the high moment method, saddle point approximation, and copulas. First, the statistic moment estimation based on the stochastic perturbation theory is presented. Thereafter, by constructing CGF (concise cumulant generating function) for the state variable with its first four statistical moments, a fourth moment saddle point approximation method is established for the component reliability estimation. Second, the copula theory is briefly introduced and extensively utilized two-dimensional copulas are presented. The best fit copula for estimating the probability of system failure is selected according to the AIC (Akaike Information Criterion). Finally, the derived method is applied to three numerical examples for the sake of a comprehensive validation. 相似文献
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