1.前言近年来,降低卡车的车辆噪声,不仅是为了符合噪声法规,而且也是用户的强烈需求.为此,降低占车辆噪声中很大比重的发动机噪声是非常有效的.本文介绍了新H07D型发动机的最新降低噪声技术,特别是采用计算评估法,降低噪声方面的内容. 以往,降低发动机噪声常常采用实验调试法,即反复进行试制、实验.因此,周期长、成本高.最近,随着计算机硬件、软件的开发,偶尔可以看到以各零件为单位的噪 1. INTRODUCTION In recent years, it has been very effective to reduce vehicle noise in trucks not only to comply with noise regulations but also to meet the strong demand of users. For this reason, it is very effective to reduce engine noise, which accounts for a large proportion of vehicle noise. Type engine engine noise reduction technology, in particular the use of computational evaluation method to reduce noise content.In the past, to reduce engine noise often used experimental debugging method, that is, repeated trial production, the experiment.Therefore, long cycle, high cost.Recently, with the With computer hardware, software development, and occasionally you can see the noise of each part