《物流系统建模与仿真》结课论文汽车行驶平顺性建模与仿真.docVIP

《物流系统建模与仿真》结课论文 汽车行驶平顺性建模与仿真 学 院： 研究生学院 专业班级： 机械工程 学生姓名：  摘 要 通过分析汽车振动源和人体对振动的反应, 用模态综合技术, 建立了十三自由度人-椅 -车系统的动力学模型, 运用随机振动理论, 给出了振动形态、传递函数、悬架动挠度、车轮动载荷、座椅加速度等参量的计算方法, 开发了一套“ 汽车平顺性仿真软件” 并利用已有的汽车数据, 对汽车行驶时的振动特性进行了仿真, 得到了重要结论: 发动机与轮胎刚度、阻尼, 后桥阻尼对驾驶员座椅处的振动影响不大; 驾驶员座椅的垂直刚度增加很大时, 对垂直方向振动响应比较大; 前桥刚度、阻尼对驾驶员座椅处的振动影响较大; 前轮胎刚度对前桥振动影响较大, 前轮胎刚度增加, 则振动加强;后桥刚度对汽车平顺性有一定影响, 后桥刚度减小, 则座椅处垂直加速度减小. 利用该模型可对汽车行驶平顺性进行预测或评估. 关键词 汽车; 平顺性; 建模; 仿真 Abstract From the analysis of automobile vibration sources and the human responses to vibration , a mechanic model of man -chair -vehicle system with 13 degrees of freedom is built by vibration pattern analyzing technology .Using the random vibration theory , the calculating methods are developed for parameters , including vibration pattern , transfer function , wheel transient load , and acceleration of seat , automobile ride quality simulation software is developed . With available data of motor , the simulation calculating results about vibration character istics are given ,and important conclusions drawn are as follows : the stiffness and damping of the generator and wheel tire and the damping of back -axis have not much effect on the vibration of the seat ; Vertical stiffness of driver s seat has much effect on the vibration as it gets larger ; The stiffness and damping of fore-axis have much effect on the vibration of driver seat . The stiffness of the fore tires has much effect on the vibration of the fore-axis . The vibration increases with the stiffness of fore -tire increasing , The stiffness of back-axis has some effect on the automobile ride quality .As the stiffness of back-axis decreased , the acceleration of the driver ′ s seat decreases . With this simulation software , automobile ride quality can be predicted or evaluated . Key words : Automobile ; ride quality ; model ; simulation目 录 摘 要 I Abstract II 目 录 III 第1章 绪 论 1 1.1 课题研究的背景和意义 1