摘要

 
本设计根据社会消费需求，从实际出发，充分考虑汽车整体外形来实现底盘总布置的设计实现最优化，实现车身骨架的设计优化，对公交客车的形式和主要参数进行选择，并对底盘各总成包括发动机、变速箱、离合器、前桥、驱动桥、悬架系统、传向系统等进行选型。同时也做了汽车的动力性，燃油经济性的分析。设计车身骨架以及底盘车架并校核其强度和刚度。基于Siemens NX 建立车身骨架和底盘车架的三位模型，并对底盘骨架做静态有限元分析以及模态分析。通过对车架有限元模型进行无约束的自由模态分析，验证了车架本身结构的合理性。
关键词：公交客车；车架设计；有限元；模态分析 
 

Abstract

 
    The design is based on the actual needs of the society, starting from the actual conditions, fully considering the overall shape of the car to achieve optimal design and implementation of the chassis layout, optimizing the design of the car body skeleton, selecting the form and main parameters of the bus, and selecting the main parameters of the bus. It includes engines, gearboxes, clutches, front axles, drive axles, suspension systems, transmission systems, and so on. At the same time, it also analyzed the dynamic nature of the car and the fuel economy. Design the body frame and chassis frame and check its strength and stiffness. Based on Siemens NX, a three-dimensional model of the body frame and chassis frame was established, and static finite element analysis and modal analysis were performed on the chassis skeleton. Through the unconstrained free modal analysis of the frame finite element model, the rationality of the frame itself is verified.
Key words: bus; frame design; finite element; modal analysis