毕业设计（论文）-全浮式商用车驾驶室悬置系统设计.docx

PAGE II 全浮式商用车驾驶室悬置系统设计 摘 要 全套图纸加扣 3346389411或3012250582 随着国民经济水平的提高，我国汽车行业开始蓬勃发展，人们逐渐对改善商用车的乘坐舒适性这一研究方向产生了关注，而大量汽车公司也希望通过对重型载货车平顺性的改善，使生产出的汽车在市场上更受消费者欢迎。驾驶室悬置系统是整车减振系统的关键组成部分之一，其性能对整车的平顺性能有着极其重要的影响。目前商用车驾驶室一般采用相比于半浮式悬置系统性能更优的全浮式悬置系统。国内企业在全浮式商用车驾驶室悬置系统的研究与设计上过于依赖经验，本文希望通过全浮式驾驶室悬置系统，研究车辆在不同路面上以不同速度行驶时驾驶室的运动特性以及驾驶员的主观感受。本文对比了国内外的驾驶室悬置系统的研究情况，并对全浮式商用车驾驶室悬置系统进行了建模，然后利用MATLAB软件的多个模块对驾驶室的运动特性进行了仿真分析。 本文利用计算机设计辅助软件CATIA建立了驾驶室悬置系统三维模型，将模型进行简化从而建立了整车1/2动力学模型，并运用拉格朗日方法建立了1/2车六自由度系统振动微分方程及其矩阵形式。接着然后利用仿真软件MATLAB的Simulink模块对商用车悬置驾驶室在不同路面激励下的运动情况进行了仿真模拟，研究了行驶时车辆的时域特性。并计算出了路面对整车模型的输入功率谱密度及输出功率谱密度，由此求得驾驶室的综合总加权加速度均方根值，依照该值对驾驶员的主观感受进行了评价。最后利用MATLAB的GUI界面将整个仿真过程程序化，形成了一个交互良好的软件包。 关键字：驾驶室悬置系统；多自由度系统微分方程；商用车；仿真分析 Abstract With the improvement of the national economic level, Chinas automobile industry began to flourish, people gradually focus on the research direction of improving the ride comfort of commercial vehicles, and a large number of automobile companies also hope to improve the ride comfort of heavy trucks, so that the produced cars will be more popular among consumers in the market. Cab suspension system is one of the key components of the vehicle vibration reduction system, and its performance has a very important impact on the vehicle smooth performance. At present, commercial vehicle cab generally adopts the full-floating suspension system with better performance than the semi-floating suspension system. Domestic enterprises rely too much on experience in the research and design of full-floating commercial vehicle cab suspension system. This paper hopes to study the cab motion characteristics and drivers subjective feelings when the vehicle is running on different roads at different speeds through the full-floating cab suspension system. In this paper, the research situation of cab suspension system at home and abroad is compared, and the cab suspension system of full-floating commercial vehicle is modeled, and then the motion characteristics of the cab are sim