车辆在四轮相关随机输入下的响应时频特性研究

车辆在四轮相关随机输入的动力响应分析是车辆行驶平顺性研究的重要基础。文章根据各向同性假设，应用指数模型建立了车辆四轮相关路面随机输入通用频模型，左右轮相干函数只与轮距和车速有关，而无需实测相干函数，因此频域模型适合各种车辆，通用性好，计算方便。在此基础上建立四轮相关随机输入的时域模型，对车辆的时频响应进行了详细分析和比较，结果表明时域和频域方法是统一的，时域方法可为车辆的主动控制提供重要参考。

Research for Response Time Domain and Frequency Domain Feature in Four-wheel Stochastic Input of Vehicle

dynamic response analysis for four-wheel stochastic input is important base of research for ride of the automobile. The thesis builds tbur-wheel stochastic input model according to assumption of isotropy and index model. Right-and-left wheel function relative tread and speed, dispense with actual measurement function, so frequency domain model adapt to all vehicle. It has good commonality, convenience. Builds four-wheel stochastic input time domain according to this, analysis and compare for response of vehicle. Conclusion is time domain method and frequency domain methods are uniform. Time domain method provide important reference of active control.