某商用车驾驶室白车身模态分析

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某商用车驾驶室白车身模态分析

作者：谢小平,韩旭,陈国栋,周长江

来源：《湖南大学学报·自然科学版》2010年第05期

摘要:以某商用车驾驶室白车身为原型,利用模态分析方法对其动力学特征参数进行分析.在理论(正问题)和实验(反问题)两个互补的模态分析过程中,利用有限元模型进行理论模态分析,为实验模态分析的实施打下良好基础.分别采用最小二乘复指数法(LSCE)和最小二乘复频域法(LSCF)进行实验模态分析,得到各阶模态振型并对理论分析的结果进行修正.经过两种结果的比较和分析,最终得出准确的模态分析结果并对白车身原型提出改进意见.生产厂商依据改进意见进行工艺改进,通过用户实际使用证实了改进方案的有效性和正确性.

关键词: 商用车驾驶室;白车身;有限元;实验模态分析;LSCE;LSCF

中图分类号:TH113.1文献标识码:A

Modal Analysis of Commercial Vehicle Cab’s Body-in-White

XIE Xiao-ping+, HAN Xu, CHEN Guo-dong, ZHOU Chang-jiang

(State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Faculty of Mechanical and Vehicle Engineering, Hunan University, Changsha, 410082)

Abstract: The theory modal analysis (TMA, forward problem) and experimental modal

analysis(EMA, inverse problem) methods are both used to analysis dynamics characteristic parameters of one commercial vehicle cab’s body-in-white. Finite element modal analysis is carried out to get mode shape and lay down well basis to experimental modal analysis in TMA process. In EMA process, LSCE(Least Squares Complex exponent method) and LSCF (Least Squares Complex Frequency Domain method) methods are used to get mode shape and modify TMA results. With comparison to all results, the accurate conclusion can be reached and improvement opinion is brought forward to the prototype. The improvement projection was proved to be effective by consumers’utilization after manufacturer put it into applications.

Keywords: commercial vehicle cab’s bod y-in-white; finite element method; experimental modal analysis; LSCE; LSCF

车辆在行使的过程中常因路面不平,车速和运动方向的变化,车轮、发动机和传动系的振动激励,以及齿轮的冲击等各种外部和内部激励,极易引起整车和局部振动。当外界激振频率与系统固有频率接近时,将产生共振[1]。