Abstract:

The properties of vehicle's noise vibration harshness(NVH)  was affected by the vibration isolation of powertrain mount system. Using the mechanism of vibration isolation to conclude the vibration transmitting rate expression which was  defined by RMS; based on the mechanism of double layer vibration isolation,a 6-DOF model of a powertrain mounting system and a 12-DOF full vehicle model including the car frame were built respectively, the inherent characteristics and  frequency response of the two models were compared by the simulation analysis; and under the idling conditions, acceleration response of the powertrain mounting system was studied; the vibration transmitting rate curve of the mounting points was obtained eventually. The results show that the full vehicle model can response the vibration characteristics of a powertrain mounting model and get the vehicle's vibration isolation transmitting rate at the same time.

Key words: powertrain mounting, model of mounting system, full vehicle model, vibration isolation transmitting rate

摘要：

针对动力总成悬置系统隔振性能的优劣影响整车的NVH特性,应用隔振原理,给出了由加速度均方根值定义的系统隔振传递率表达式;基于双层隔振机理,分别建立了动力总成6自由度悬置模型和包括车架的12自由度整车模型,并通过仿真分析比较了两种模型的固有特性和频域响应;在怠速工况下研究了悬置软垫处的加速度响应;最终获得各悬置点的隔振传递率曲线。研究结果表明,整车模型能够反应悬置系统的振动特性及其隔振传递率。

关键词: 动力总成, 悬置模型, 整车模型, 隔振传递率