某轻型商用车悬置系统设计与优化

Design and Optimization of Light Commercial Vehicle Powertrain Mounting System

动力总成悬置系统的性能是整车NVH性能控制的关键。文章以某轻型商用车悬置系统为研究对象,对其进行设计及优化。文章基于主惯性轴理论确定了悬置系统的初始安装角度,并基于能量解耦法建立Adams模型对胶块安装角度及刚度进行优化设计。通过整车试验表明怠速工况下悬置系统隔振效果良好,但后悬置在加速工况下在2930rpm处存在共振,然后通过CAE分析,提出了后悬置系统优化设计方案,并对改进后悬置系统重新进行测试验证。测试结果表明优化后共振消除,整个悬置系统性能达到设计要求。

The performance of powertrain mounting system is one of the key techniques for the vibration isolation and noise reduction of vehicle.One self-developed light commercial vehicle was chosen as research object,design and optimization were conducted for it.First,initial angle of the mounting system was determined based on principal inertia axis theory.Then building Adams model to optimize angle and determine the mounting systemstiffness based on method of energy distribution.The test results show that the system has good effect for vibration isolation under ldling speed,but transmission mounting system has a resonance in the frequency of 100Hz under acceleration condition.Next,analysed the cause and provided the solution of the resonance problem based on hypermesh.Finally,whole vehicle NVH tests were carried out.The results show that the resonance problem was resolved.The performance of powertrain mounting system reaches design requirements.