Excitation force analysis of a powertrain based on CAE technology

The excitation force of a powertrain is one of major sources of interior noise in a vehicle. This paper presents a novel approach to predict the interior noise caused by the vibration of the powertrain by using the hybrid TPA (transfer path analysis) method. Although the traditional transfer path analysis (TPA) is useful for the identification of powertrain noise sources, it is difficult to modify the structure of a powertrain by using experiments for the reduction of vibration and noise. In order to solve this problem, the vibration of the powertrain in a vehicle is numerically analyzed by using the finite element method (FEM). The vibration of the other parts of the vehicle is investigated by using experiments based on vibrato-acoustic transfer function (VATF) analysis. These two methods are combined for the prediction of interior noise caused by a powertrain. Throughout this research, two papers are presented. This paper presents a simulation of the excitation force of the powertrain exciting the vehicle body based on numerical simulation. The other paper presents a prediction of interior noise based on the hybrid TPA, which uses the VATF of the car body and the excitation force predicted in this paper.     

基于PolyMAX方法的某轿车白车身实验模态分析

对实验模态分析的有关理论与方法,尤其是最小二乘复频域法的理论进行了详细介绍.分别采用最小二乘复频域法和最小二乘复指数法对某轿车白车身进行了实验模态分析并对其结果进行比较和分析.最后将实验结果和有限元模态分析结果进行对比,并结合刚度测试结果,对向车身提出改进意见.     

机电作动器(EMA)驱动转鳍机构的研究

减摇鳍是人为减小船舶在海浪中横摇最通用、最有效的方法,现今减摇鳍转鳍驱动机构绝大部分利用的是电液伺服作动系统。与电液伺服作动系统,甚至与电动静液作动器(EHA)相比,机电作动器(EMA)具有结构简单、可靠性强和效率高等诸多优势。以现有GJB2860-97型号转鳍作动器为背景,设计一种驱动转鳍机构的大功率机电作动器。阐述了从结构设计到建模仿真的过程,对机电作动器进行详细的集成化设计,分别利用Solidworks及ANSYS软件对机电作动器进行建模仿真,为减摇鳍转鳍驱动机构的全电改造提出了一套设计及建模仿真分析方法。