等效辐射声功率在汽车NVH开发中的应用

摘要

Taking three typical domestic cars as examples,the peak value consistency of the equivalent radiant power(ERP) and the noise transfer function(NTF)was analyzed and summarized.Sound pressure levels of the driver's right ear and the rear passenger's left ear of three car models A,B and C were analyzed.Non-standard sound pressure levels caused by excita-tions were counted.The ERP of the vital panels of the three models was analyzed at the same excitations.Statistical analysis shows that at the same frequency,more than 50% non-standard NTF peak values are consistent with some panels's ERP peak values.A target value of ERP was proposed.The structure was optimized in models to meet both ERP and NTF standards at the same time.In the early stage of NVH development,especially in the phase of Body in White,this ERP analysis method can help find out problems very soon and shorten the development time.%以3种典型的国产轿车为例,分析归纳等效辐射声功率(ERP)的峰值与噪声传递函数(NTF)的峰值的一致性.分析了驾驶员右耳及右后乘客左耳的声压级,统计引起声压级未达标的激励源,在相同激励源作用下统计分析了各车型关键板件的ERP,结果表明在同频率下未达标激励源的50%,以上NTF超标峰值与某些板件ERP峰值一致.提出ERP目标值,根据模态进行结构优化,可使得ERP和NTF指标同时满足要求.在汽车NVH开发前期采用本文方法,可在白车身分析阶段及时发现问题,从而缩短开发时间.