基于正向开发的商用车平顺性主客观评价方法研究

分析现阶段平顺性试验方法及主客观评价方法,指出其难以指导商用车平顺性正向开发和工程应用上的不足。从当前我国商用车正向开发对平顺性评价体系的需求出发,将平顺性评价工况分为随机输入路面工况和脉冲输入路面工况,针对商用车随机路面行驶振动加速度频谱响应和脉冲输入行驶振动加速度响应的特征,提出对应的随机输入行驶分频评价方法和脉冲输入行驶评价方法。同时,基于该评价方法,对17个商用车主客观评价样本数据进行分析,得出客观指标和主观评分的对应关系,实现了主客观统一。在此基础上提出一种商用车平顺性主观评分标准,从用户角度定义必须整改、勉强接受、接受3个产品定义区间与其对应的评分区间,研究商用车不同车型在高速水泥路、高速沥青路、二级水泥路、二级沥青路和减速带工况的加权系数,提出一种适用于不同车型的评价模型。最后,以某牵引车为例,对该主客观评价方法和评价模型进行可行性验证,结果表明该评价方法和评价模型可行,对商用车平顺性评价能力提升和产品平顺性正向开发都具有重要的指导意义。

The Evaluation of the Sound Insulation of Partition in Expanded Frequency Range

This paper reports on an evaluation of airborne sound insulation in a wider frequency range then is used in classical measurements. For analyzing sound insulation was used frequency range from 50 Hz to 10 kHz via standard range I00 Hz to 3,15 kHz. For four constructions with different structure was measured sound reduction index depend on frequency and calculated Weighted sound reduction index according to EN ISO 717-1. Then the results were compared. The measurements were made for samples of construction with different sizes. The results of measurements show how the size of sample influence on measured sound insulation. This article could be useful for specialist of architect acoustic and all who interest in sound insulation.