汽车动力总成悬置系统多工况运行模态试验研究  

Experimental Study on Multi Work Conditions Operational Modal of Automotive Engine Mounting System

作　　者：张武[1,2] 陈剑[1] 陈鸣[1] 

机构地区：[1]合肥工业大学,合肥230009 [2]安徽农业大学,合肥230031

出　　处：《中国机械工程》2013年第22期3118-3123,共6页China Mechanical Engineering

基　　金：安徽省重大科技攻关项目(06002002A)

摘　　要：由试验测得发动机启动、怠速和急加速三种典型工况下的振动响应,进行了动力总成悬置系统的运行模态参数识别。采用多参考点最小二乘复频域法,通过试验测得的振动响应获得系统工作振型。由于发动机激励不具备零均值白噪声的特点,运用了多种模态置信度指标进行模态验证,获得了较可信的模态参数。试验结果表明,动力总成悬置系统的运行模态参数与发动机工况有关,对于大阻尼和密集模态的动力总成悬置系统,多工况的运行模态试验可以更准确地识别悬置系统的模态参数。研究结果对悬置元件参数设计具有重要的参考价值。The vibration responses were measured on different working conditions ,including start-ing ,idling and revving up .The powertrain mounting system operational modal parameters were identi-fied .The polyreference least squares complex frequency domain method （PRLSCF ） technology was employed to obtain system working mode by the experiments .For the engine power source did not have zero mean and white noise characteristics ,a variety of modal confidence indexes were applied in the model validation ,and the relatively credible modal parameters were obtained .The test results show that operational modal parameters are relative to the operating conditions of the engine .For the mounting system with the heavy damping and close modal property ,multiple operational modal tests can identify the modal parameters more accurately ,which is consistent with the mounting component parameter design .

关 键 词：动力总成悬置系统 多工况 运行模态 参数识别 

分 类 号：TH122[机械工程—机械设计及理论] U463.33[机械工程—车辆工程]