考虑车身柔性的发动机悬置参数分析与优化

Analysis and Optimization of Engine Mounts Parameters Considering Car-body Flexibility

为揭示悬置参数对整车NVH性能的影响,采用Adm as软件建立了考虑车身柔性的动力总成悬置系统模型,仿真计算了液压悬置动刚度、损失角以及整车悬置点振动加速度值,并与实验数据进行了对比,验证了仿真模型的正确性;进而采用正交试验设计方法,以驾驶员座椅处地板垂向振动加速度均方根值作为试验指标,先后通过单因素和多因素分析,从悬置的33个参数中,快速找到对该指标影响最大的6个参数,最后对它们进行优化。结果表明:考虑车身柔性的发动机悬置多体动力学模型的仿真结果更接近试验值;而利用正交试验,可快速地对关键的悬置参数进行优化,效果良好。

For revealing the effects of engine mount parameters on the NVH performance of vehicle,a model for powertrain mount system with consideration of car-body flexibility is built by using software ADAMS.A simulation on the dynamic stiffness,loss angle and vibration acceleration at suspended points of hydraulic suspension is conducted and its results are compared with test data,verifying the correctness of the model.Based on this,by using orthogonal experimental design with RMS of vertical acceleration at the floor right under driver seat as indicator,successively through single factor and multifactor analyses,6 out of 33 parameters are quickly found to be the most influential ones in terms of their contributions to that indicator,and finally an optimization on the 6 parameters is performed.The results show that the simulation results with the model taking car-body flexibility into account are closer to test data,and the use of orthogonal experimental design can speedily optimize engine mount parameters with good results.