【作者】 张凤；

【导师】 秦玉英；

【作者基本信息】 辽宁工业大学 ， 车辆工程， 2012， 硕士

【摘要】 随着汽车行业的发展,每年都有大量新车型的出现,如何缩短开发周期,而且要能够保证新车性能,是当前亟待解决的问题。汽车行驶平顺性作为衡量驾驶员与乘客舒适性,在新车开发初期是一个重要问题。本文就此问题在前人研究的基础之上,做了进一步探讨,从另一种角度出发,需求一种能快速解决平顺性分析的方法,为新车开发缩短周期,降低新车开发成本。本论文基于有限元法思想,对汽车行驶平顺性模型进行离散,划分单元,根据单元性质特征进行同类单元的划分,推导出同类单元刚度阵通式。对于一个平顺性模型的不同单元,将单元数据带入同类单元刚度阵通式,即能写出其单元刚度阵。将每个单元的刚度阵、阻尼阵进行分块组装完成整体分析。采取强迫位移约束处理方法建立汽车平顺性数学模型。提出总位移向量、总质量阵组装方法。通过手工组装汽车平顺性数学模型的系数矩阵,验证建模方法的有效性。研制单元分析、整体分析与约束处理的程序模块,用于自动生成总刚度阵和总阻尼阵。以一种易于工程人员理解和应用的方式,阐述虚拟激励法在汽车平顺性分析中的应用理论与方法。与建模方法结合,给出虚拟激励法在汽车随机振动分析中的具体应用,比较虚拟激励法和傅里叶方法的不同特点。验证应用虚拟激励法进行汽车平顺性分析与傅里叶方法具有等价性,但优于傅里叶分析方法。更多还原

【Abstract】 In recent years, with the development of the automotive industry, a large number of new cars’model having appeared in the market. How to reduce cycle time, and should be able to ensure the performance of the new car, it must been solved. Automobile Ride Comfort is key symbol what is used to judge driver and passenger comfort, In the early stage of development, it is the primary issue.The basis of the previous theory of Automobile Ride Comfort analysis, the paper put forward a new method to create mathematical model. In this paper, based on the Finite Element Method what to discrete structural system of Vehicle Random Vibration, and divided into kind units, and derivation of the general matrix formula of the kind units’stiffness and damping. Finally, the total matrix of stiffness and damping. Taken approach of the constraints of forced displacement to establish the structure of the Mathematical Model of Automobile Ride Comfort analysis. In order to prove the method is correct, using of method of manual assembly to create total matrix of stiffness and damping. Writing software procedure modules of the units analysis, the global analysis and constraints processing.Using a way of understood and applied easily by engineer to elaborate the Pseudo Excitation Method theory and method how to application in the Automobile Ride Comfort analysis. Given the specific application of Pseudo Excitation Method in random vibration analysis of automotive, by combined with the modeling method. By compared Pseudo Excitation Method with Fourier Method to illustrate them different characteristics. Verified the equivalence of Pseudo Excitation Method and Fourier Method, and Pseudo Excitation Method better than Fourier analysis method.更多还原