摘要选取合适的空间路面功率谱密度,并将其转化为时间功率谱密度。对附加动力吸振 器的汽车进行时域分析,建立了二分之一汽车悬架系统的简化模型,并建立了相应的系 统动力学方程。采用 Wilson-θ 法直接进行数值积分来模拟汽车以 20 m/s 的速度在 C 级路 面上的行驶状况。并给出了动力吸振器参数选择的方法。通过对比加动力吸振器前后汽 车车身加速度、悬架动行程和轮胎动载荷的均方根数值来反应动力吸振器对汽车行驶性 能的影响。结果表明在高频段内动力吸振器可以较好地改善车身的振动情况。77274
毕业论文关键词 汽车减振 动力吸振器 二分之一悬架系统模型 数值仿真
Title Study on vibration performance of vehicle based on dynamic vibration absorber
Abstract In order to find out the influence of dynamic vibration absorber on the vehicle, the appropriate road space frequency power spectral density, the simplified model of 1/2 vehicle suspension system and the dynamic equations of it were built。 Then the road space frequency power spectral density was transformed into the time frequency power spectral density。 And the method of choosing dynamic vibration absorber parameters was provided。 The time domain characteristics of the suspension with dynamic vibration absorbers were analyzed and compared with the suspension without dynamic vibration absorbers by simulating the car’s vertical displacement and vertical acceleration when it drove on the C-class road at a speed of 20 m / s based on the wilson-θ method。 In addition, the root mean square values of the body acceleration, suspension deflection and dynamic tire load of the suspension with dynamic vibration absorbers were calculated and compared to the ordinary passive suspension。 The results show that the dynamic vibration absorber can improve the vibration performance of the body in high frequency。
Keywords vehicle vibration reduction dynamic vibration absorber 1/2 vehicle suspension system numerical simulation
毕业设计说明书 第 I 页
目 次
1 引言 1
1。1 研究的目的和意义 1
1。2 动力吸振器的概述 1
1。2。1 动力吸振器的基本原理 1
1。3 论文主要内容及论文章节安排 2
1。3。1 论文主要内容 2
1。3。2 论文章节安排 3
2 路面不平度的确定 4
2。1 路面空间功率谱密度函数的确定 4
2。2 将路面空间功率谱密度函数转换为时间功率谱密度函数 4