【作者】 苏茜；

【导师】 黄华梁；

【作者基本信息】 广西大学 ， 机械设计及理论， 2004， 硕士

【摘要】 本文利用模糊可靠性理论对装载机系统进行模糊可靠性分析，并结合优化设计理论对装载机传动轴进行模糊可靠性优化设计。 文中概述了机械系统可靠性研究的现状和发展趋势，对机械系统可靠性分配理论和方法进行了研究和分析。通过对装载机系统进行结构分析，采用故障树分析法(FTA)，建立了装载机系统的故障树，并根据系统故障树对装载机整机系统及其子系统、零部件进行了定性分析和定量计算。故障树的建立，有助于维修者快速，准确地判明系统的基本故障、确定故障产生的原因，从而节省维修时间，提高工作效率。同时运用失效率和重要度相结合的分配方法对装载机整机进行一级可靠度分配，并根据可靠度再分配的基本思想对装载机系统进行二次可靠度分配，确保装载机各子系统的可靠度分配合理。 本文还根据装载机传动轴受载荷特点及设计要求，结合模糊数学和优化设计理论知识，建立了传动轴的模糊可靠性优化设计模型。通过将模糊可靠性优化设计模型转化为常规的优化设计模型，编制相应的优化程序对其进行优化求解。更多还原

【Abstract】 In this thesis, the fuzzy reliability analysis of the wheel loader system and the fuzzy reliability-optimization design of its transmission shaft were carried out by the fuzzy reliability and optimization theory.This thesis expounded the actualities and trend of the reliability study of mechanical system, and researched the theories and methods of the reliability distribution. The fault tree of the loader system is built after analyzing the structure of the loader system with the method of fault tree analysis(FTA). The whole loader system, its subsystems and its parts were analyzed qualitatively and quantitatively. The basic faults of the system and the cause productive of them can be ascertained with the help of the fault tree, which save much time and raise working efficiency. At the same time, the reliability of the whole loader system was distributed by the method of combining the failure rate with the important degree. And according to the idea of reliability redistribution, the reliability of theloader system was redistributed for insuring the reliability distribution of the loader’s subsystem is correct.According to the load characteristics and design requirements of the transmission shaft, this paper established the reliability-optimization design model with fuzzy mathematic and optimization theory. Then the fuzzy reliability-optimization design model was transformed into conventional optimization model, and the optimal results were obtained by optimum procedure programmed.更多还原