【作者】 吉向东；

【导师】 黄鼎友；

【作者基本信息】 江苏大学 ， 车辆工程， 2005， 硕士

【摘要】 随着人们对汽车乘坐舒适性要求的提高,液压悬置逐渐取代传统橡胶悬置在中高档轿车上普及,甚至开始尝试运用到客车领域,但是这方面的研究较少。本文以全顺轻型客车动力总成悬置系统为研究对象,从仿真和试验两方面对悬置和动力总成悬置系统进行隔振研究,旨在分析液压悬置运用到客车上出现的新问题。 首先,通过对液压悬置的结构、工作原理和理想动特性的分析,并结合全顺客车所使用液压悬置动特性的试验实测结果,对该种液压悬置的隔振性能作出了初步评价。然后,通过对全顺客车柴油发动机主要激振力(矩)的试验测定,确定了该发动机的主要激励特点。根据全顺客车动力总成-液压悬置系统的试验模态分析,指出了在各阶模态频率和模态阻尼等模态参数影响之下的系统隔振特点,并提出了改进意见。 在对全顺客车动力总成悬置系统建立的六自由度力学和数学模型的基础上,运用Matlab/Simulink进行多工况振动响应仿真分析,比较了动力总成-液压悬置和动力总成-橡胶悬置两种系统的隔振效果差别,并揭示了悬置的动态参数和空间布置形式对系统振动响应的影响规律。 最后,通过对全顺客车动力总成悬置系统隔振性能的多工况实车试验研究,进一步对动力总成-液压悬置和动力总成-橡胶悬置两种系统的隔振性能进行了试验分析,并且对启动工况下的振动响应进行了频谱分析,深入研究了全顺客车动力总成悬置系统的隔振特点,并提出了系统优化的具体建议。更多还原

【Abstract】 With the great demand on the riding comfort, hydraulic engine mounts are increasingly used on middling or high-class cars, taking the place of traditional rubber mounts. Nowadays hydraulic mounts start to be used on passenger cars, but researches on this field are very few. In order to finding new problems, in the thesis, vibration isolation performance of the engine mounting system of the light passenger car, Transit, was analyzed through experiment and simulation.Firstly, based on the analysis of hydraulic mount’s structure, operating principle, ideal dynamic characteristics and the testing results of dynamic characteristics, its vibration isolation performance was incipiently evaluated. The dominant excitation of diesel engine was figured out through experiment. The vibration isolation characteristic of the hydraulic mounting system, was studied by modal test and some positive advices were given.Secondly, according to a six degree of freedom mechanical and mathematic model of the passenger car’s engine mounting system, system’s vibration was simulated by Matlab/Simulink under different operating conditions. The different vibration isolation performance between hydraulic and rubber mounting system was analyzed. Mounts’ parametric and orientation influence on the system’s vibration was clearly showed.Finally, with an experimental study on the engine mounting system under different operating conditions, vibration isolation performance between hydraulic and rubber mounting system was further analyzed. Frequency spectral analysis on the system’s vibration was given under the startup condition. A further study on the vibration isolation characteristics of Transit passenger car’s mounting system was carried out and some optimization suggestions were provided.更多还原