摘要
为解决汽车噪声问题,首先采用包含线性和非线性连接子结构的自由界面模态综合法,建立副车架橡胶支承控制前后的整车随机动力学模型;然后在时域内对汽车控制前的动力学模型进行仿真模拟,并与台架试验结果进行对比,发现两者具有较好的一致性,说明所建模型是有效的;最后将副车架橡胶支承作为无源控制元件,应用准最优控制理论对在路面随机载荷和发动机载荷作用下汽车振动和车内噪声特性进行研究,并与未加控制和理想最优控制时的响应结果进行对比,结果表明用准最优控制理论进行整车减振降噪具有很好的综合效果.该结果可为不同控制方法的选取提供理论依据.
With the problems of automobile noise, firstly, the free interface component mode synthesis method containing linear and nonlinear joint substructures is used to build uncontrolled and controlled random dynamic model for rubber support of engine cradle; secondly, the uncontrolled vibration characteristics of automobile is simulated in time-history. The numerical results are in good agreement with those from bench tests, which implies that the mathematical model is valid and reliable; finally, the rubber support of engine cradle is considered as passive control device, and the controlled vibration properties and interior noise of automobile excited by road surface load and engine load are studied by quasi-optimum control method. The results are compared with those without control and ideal optimum control. The results indicate that quasi-optimum control theory can achieve good effect to reduce automobile vibration and noise. The research provides a theoretical basis for selection of different control methods.
出处
《计算机辅助工程》
2008年第4期24-29,共6页
Computer Aided Engineering
关键词
模态综合
理想最优控制
准最优控制
振动
噪声
component mode synthesis
ideal optimum control
quasi-optimum control
vibration
noise
