汽车行驶平顺性仿真与优化研究

发布时间：2018-03-04 02:23

本文选题：行驶平顺性　切入点：汽车模型　出处：《辽宁工业大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着科技的蓬勃发展,汽车已经成为人们日常生活中最常见的交通工具,各大汽车厂家之间的竞争已不再局限于生产效率,汽车行驶舒适性也是各家竞争的关键点,为了提高汽车行驶舒适性,那么汽车平顺性振动仿真就成为了一个非常重要的研究项目。论文首先介绍了汽车行驶平顺性的意义,平顺性研究国内外研究状况;介绍了模态分析法和虚拟激励法的基本原理和使用情况,建立了1/4车辆模型、1/2车辆模型、整车模型,之后使用MATLAB分别对这三个模型进行振动仿真,求出它们的车身垂直加速度功率谱密度、前后悬架动挠度功率谱密度、前后轮相对动载功率谱密度。建立了汽车平顺性优化设计数学模型及区间不确定优化模型,然后利用区间分析方法对不确定优化模型进行转换,最后将区间不确定性分析与优化方法应用于二自由度模型,并对此进行分析。本文基于模态分析与虚拟激励相结合的方法来对平顺性进行仿真优化,由虚拟激励法构造具有复谐激励特点的路面激励,在复谐激励下的求取振动的响应量。通过汽车虚拟振动响应量的统计特性来分析优化汽车的平顺性。结果表明,此方法是可行的。
[Abstract]:With the rapid development of science and technology, automobile has become the most common vehicle in people's daily life. The competition among major automobile manufacturers is no longer confined to production efficiency. In order to improve vehicle ride comfort, vehicle ride comfort vibration simulation has become a very important research project. Firstly, this paper introduces the significance of vehicle ride comfort, the research status of ride comfort research at home and abroad; This paper introduces the basic principle and application of modal analysis method and virtual excitation method, establishes the 1/4 vehicle model / 1 / 2 vehicle model and the whole vehicle model, and then uses MATLAB to simulate the vibration of the three models, respectively. Their vertical acceleration power spectral density, dynamic deflection power spectral density of front and rear suspension and relative dynamic load spectrum density of front and rear wheels are obtained. The mathematical model of vehicle ride comfort optimization design and the interval uncertainty optimization model are established. Then the interval analysis method is used to transform the uncertain optimization model, and the interval uncertainty analysis and optimization method is applied to the two-degree-of-freedom model. Based on the combination of modal analysis and virtual excitation, this paper simulates and optimizes the ride comfort, and constructs the road surface excitation with complex harmonic excitation by virtual excitation method. The response of vibration is obtained under complex harmonic excitation. The statistical characteristics of the virtual vibration response of the vehicle are used to analyze and optimize the ride comfort of the vehicle. The results show that this method is feasible.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U461.4

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