【作者】 胡春林；

【导师】 张俊红；

【作者基本信息】 天津大学 ， 动力机械及工程， 2008， 硕士

【摘要】 发动机动力总成是汽车主要的振动源和噪声源之一,随着汽车向高速化和轻量化方向发展,振动噪声问题日益突出,人们对振动和噪声的要求越来越严格,汽车行驶的平顺性、乘坐舒适性越来越受到人们的关注。因此,动力总成的减振和隔振成为国内汽车行业亟待解决的问题。合理设计动力总成悬置系统,不但可以改善汽车的乘坐舒适性,还可以延长发动机和其它部件的使用寿命,是解决内燃机整机振动最为有效的办法。本文对悬置系统设计方法进行了比较全面的分析研究。在这一基础上,根据JNP客车上动力总成悬置系统的振动情况提出了比较实际有效的悬置系统减振设计方法,即改变悬置的角度和优化橡胶垫刚度参数,最终达到了减振的目的。本文首先测量了装配国产发动机的客车的振动情况,分析了振动较大的原因,同时还与配装进口发动机的同一车型的振动情况进行了对比,确立了改进目标;然后自行设计了实验台架并建立动力总成三维模型,获取了动力总成质量参数和惯性参数,找到了主惯性轴的位置,设计了合理的悬置角度;接着建立了系统的六自由度振动模型,并在ADAMS软件中建立其动力学仿真模型,输入实验得到的参数分析了动力总成悬置系统的固有特性;最后在MATLAB中以解耦度和悬置系统模态频率范围为目标,对悬置垫刚度参数进行了优化,并对改进后的悬置系统进行了研究,取得了一定的减振效果。更多还原

【Abstract】 Powertrain is one of the most principal noise sources and vibration sources of autos. With the development of high-speed and lightweight design,the noise and vibration problems are increasingly outstanding. And people pay more and more attention to the stabilization and ride comfort of a working car. As a result, damping and vibration isolation of powertrain are urgently needed to be solved in the domestic auto industry. Reasonable design of engine mounting system can not only improve ride comfort, but also extend the life of engine and other components. It is the most effective way for the engine vibration.This paper makes a comprehensive study of the design method of mounting system. And on this basis, a practical and effective mounting system is proposed according to the vibration state of engine mounting system on a bus, that is change the setting angle and optimize the stiffness parameters of rubber bearings, the result is that the vibration is decreased.First of all, the reason of strong vibration has been analyzed according to the test of a bus with domestic engine mounting system. What’s more, an improved goal has been established according to the comparison results between the vibration of a bus with domestic engine mounting system and a bus with foreign ones. Secondly, In order to acquire the location of mass center and the moment of inertia of the powertrain, find out the inertia axis and design a reasonable setting angle, the test-bed and the powertrain’three-dimensional model have been established. Thirdly, the 6-DOF vibration mode and the dynamic simulation mode of the mounting system have been established, and the natural characteristics of the engine mounting system have been analyzed after the main design parameters measured inputted to the simulation mode. At last, the optimal mounting rubbers are obtained by MATLAB software, and an experiment is carried out to make sure the improved mounting system has better vibration damping effect.更多还原