文档介绍：南京航空航天大学硕士学位论文摘要变速器是汽车传动系中一个比较关键的部件,它设计的好坏直接影响到汽车的使用性能。随着汽车工业的高速发展和汽车现代设计方法的开发和应用,人们对汽车变速器的设计要求越来越高。其中,减小变速器体积,提高变速器可靠性以及改善其与发动机的匹配更是当前急需解决的问题。本文将可靠性优化设计理论应用到汽车机械式变速器齿轮系的设计中,根据汽车动力性要求,在保证零件结构强度和刚度可靠使用的条件下,以变速器体积最小化和功率使用率最大化为目标函数,建立了汽车机械式变速器多目标可靠性优化设计的数学模型。通过使用 MATLAB 编程实现了混合遗传算法在该模型中的求解应用,最终得到可靠性优化设计结果。通过可靠性优化设计结果与原始数据的对比,得出可靠性优化设计方法在变速器设计领域是可行的,且具有较高的工程应用价值。变速器轴系也是变速器的主要零部件,其性能直接影响着变速器的可靠性和寿命。因此本文还在第四章建立了轴的强度和刚度可靠性设计数学模型,并且以一档传动为例应用 ANSYS 对输出轴进行了扭转作用下的静力分析,结果表明所设计输出轴具有足够的刚度和强度。关键词:机械式变速器,可靠性优化设计,混合遗传算法,静力分析,功率匹配-I- 乘用车两轴式机械变速器的可靠性优化设计 ABSTRACT Transmission isa key part in the driveline of the automobile. The quality of design will directly affect function of use. With high development of automobile industry and the appearance of modern design method, the design of transmission is required more and more strictly. Among them, reducing the transmission volume, improving transmission reliability, and improving the current match between transmission and engineer are urgently needed tobe solved. In this paper, reliability optimal design method is applied in the field of automobile transmission design. According to requirements for dynamical performance of vehicle and the reliability of the strength and stiffness of the parts, a multi-objective reliability optimal mathematical model of auto-transmission is established on the basis of the smallest volume and the biggest power utilization ratio. The mathematical model is solved by blending ic algorithm through MATLAB programming, finally obtains the reliable optimization design result. paring the result of reliability optimal design with the primary data, I get the conclusion that this method is feasible for the field of auto-transmission design and has very high use value. The system of transmission shaft is also an important part of vehicle transmission, its performance has a direct impact on the transmission reliability and life expectancy. So chapter IVof this paper establishes the strength and stiffness reliability des