轻型汽车车架有限元分析毕业论文.doc

轻型汽车车架有限元分析
毕业论文中文摘要
轻型汽车车架有限元分析
摘要:
车架作为非承载式车身结构的主要承载部件,要承担汽车的大部分载荷,其性直接关系到整车性能的好坏。车架的性能主要取决于车架在静态载荷和动态载荷下的响应情况,因此对车架进行静、动态响应分析不仅可以评价车架自身的性能,而且还可以作为整车的行驶平顺性等性能的评价指标。其结果还可以为车架的优化设计和结构改进提供理论依据。本文运用UG软件建立农用三轮车车架零部件及总成三维模型,并运用UG或相关软件对车架进行有限元的强度分析。车架的静态特性和动态特性方面作了如下研究:
对车架及其载荷进行了适当简化,在绘图软件UG中建立了车架的三维模型,利用UG的高级仿真模块将三维模型导入,进行了有限元网格的划分。对应车架在扭转和弯曲两种工况,施加相应的边界条件和载荷条件,进行了静态响应分析,找出了车架结构中的薄弱部位。在计算得到的车架模态的基础上,研究了车架在路面上动态响应情况,选取了车架上的驾驶室安装点、发动机支架点和货箱支撑点等关键点作为响应输出,得出了个关键点的动态应力分布和动态位移情况。
本文的研究结果为研究整车振动、疲劳和噪声等问题奠定了基础,并可对厂家的生产实践具有指导意义。

关键词: 有限元;模态分析;静态特性;动态特性;
毕业论文外文摘要
Finite Element Analysis of the Frame of Light Vehicle
Abstract:
Frame is the most important part of a Body-chassis frame construction. The performance of a frame directly determined the performance of an automotive. Further more, the performance of a frame is determined by the static and dynamic characteristics of its structure. So researches on the static and dynamic characteristics can not only estimate the frame characteristics, but also estimate the characteristics of an automotive. Papers use the software of UG to establish agricultural tricycle frame three-dimensional model of parts and assembly, and the use of related software on the frame to carry out finite element analysis of strength. Frame of the static characteristics and dynamic characteristics study were as follows:
With reasonable and suitable simplifications, a fine FEM model of the frame was established by using UG. The modal analyses of the frame were processed in NX NASTRAN. Finite element mesh division. A series of static analysis, include bending and torsion, were implemented on to the frame for simulation. The results of stress and deform presented the evidence of the weakness of the frame. Based on the former modal results, research of the dynamic response on the road was followed by choosing the cab’s installation place, the engine’s rod and the carriage’s support points as the output points. The frame’s dynamic stress dist