增程式电动汽车动力总成悬置系统解耦与隔振研究

发布时间：2018-09-01 06:24

【摘要】：汽车动力总成振动是汽车的主要振动激励源之一,该振动对汽车的平顺性、乘坐舒适性等NVH性能影响巨大。动力总成悬置系统设计合理则作用显著,不仅可以明显地减振降噪、改善汽车的乘坐舒适性,而且还能减缓动力总成与其它部件的损坏。在合理布置悬置系统的过程中,悬置系统的解耦优化设计与隔振优化是十分重要的。本文以某款国产增程式电动轿车功能样车为研究对象,主要研究其动力总成悬置系统的解耦、隔振性能及其优化。通过查阅大量文献资料,结合增程式电动汽车悬置系统的特点分析该样车振动的主要激励力,根据实际模型的各项参数通过在Adams/View模块里建立动力总成悬置系统六自由度实体模型,并在Adams/Vibration模块下分析得出悬置系统的解耦度并进行优化仿真分析。为了验证Adams仿真的正确性,进行实车试验,试验结果与Adams仿真中的结果误差不超过±10%。然后以悬置刚度和位置坐标为优化变量以悬置系统能量解耦为目标函数进行优化仿真,优化前后的解耦性能显示,优化后动力总成悬置系统的能量耦合程度大大降低,基本满足要求。最后为了得到隔振性能优越的悬置系统,在隔振理论的基础上,通过试验测试出原状态悬置系统的隔振性能,分析出各个悬置的问题所在,给出悬置系统的整改方案并进行试验验证,最终得出性能较优的悬置系统。
[Abstract]:The vibration of automobile powertrain is one of the main vibration excitation sources of automobile. The vibration has a great influence on the ride comfort and NVH performance of the vehicle. The reasonable design of powertrain mount system can not only reduce vibration and noise obviously, improve the ride comfort of automobile, but also slow down the damage of power assembly and other parts. The decoupling optimization design and vibration isolation optimization of the mounting system are very important in the process of reasonably arranging the mount system. This paper focuses on the decoupling, vibration isolation and optimization of the powertrain mount system for a functional prototype of a domestic extended range electric car. By consulting a large number of documents and combining with the characteristics of the mounting system of the extended range electric vehicle, the main excitation force of the vibration of the prototype vehicle is analyzed. According to the parameters of the actual model, the six-degree-of-freedom solid model of the powertrain mount system is established in the Adams/View module, and the decoupling degree of the mount system is obtained under the Adams/Vibration module and the optimization simulation analysis is carried out. In order to verify the correctness of Adams simulation, the actual vehicle test is carried out. The error between the test results and the results in Adams simulation is less than 卤10. Then the optimal simulation is carried out with the mounting stiffness and position coordinates as the optimization variables and the energy decoupling of the mount system as the objective function. The decoupling performance before and after the optimization shows that the energy coupling degree of the powertrain mount system is greatly reduced after the optimization. Basically meet the requirements. Finally, in order to obtain the mount system with superior vibration isolation performance, on the basis of vibration isolation theory, the vibration isolation performance of the original state mount system is tested through experiments, and the problems of each mounting system are analyzed. The improvement scheme of the mount system is given, and the test is carried out. Finally, the better performance of the mount system is obtained.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U469.72

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