OTPA在某型重卡室内降噪上的应用
Application of OTPA in the Noise Reduction of the Cabin of Some Type of Heavy Truck

本文以某型号重型卡车舱室为研究对象，在阐述运行工况下传递路径分析方法(OTPA，即Operational Transfer Path Analysis)测试分析基本原理的基础上，采用OTPA测试方法，并对其进行了整车振动噪声的传递路径分析，创建了不同的传递路径模型，进而识别该重型卡车舱室噪声的主要贡献量。使用OTPA方法可以通过串扰消除补充计算传递函数来分解相干性的激励源。同时，具体分析了结构声与空气声的子传递路径对其贡献量大小。结果表明：某型重卡10档WOT工况下室内噪声的主要贡献量来自于结构声传递，其主要来源于悬置被动侧；而动力总成辐射成为了空气声传递的主要贡献；针对室内噪声3阶成分在1200 rpm处存在的问题，其主要的贡献量为进气系统的辐射噪声；而在1600 rpm处存在的问题，其主要贡献源于悬置系统与进气系统的结构声传递。
This paper takes the cabin of the some type of heavy truck as the research object. Based on the basic principle of OTPA test and analysis, the OTPA test method is adopted to analyze the transmission path of vehicle vibration and noise and different transmission path models are established to identify the main contribution of the cabin noise of the heavy truck. Even if the excitation source has a certain degree of crosstalk, the OTPA method can compensate for the calculation of the transfer function through the CTC function. At the same time, the contribution of structural-born noise and air-born noise is analyzed. The results show that the main contribution of cabin noise of some types of heavy trucks under 10-gear WOT condition comes from structural- born noise which mainly comes from the passive side of the suspension. Powertrain radiation is the main contribution of air-born noise. Aiming at the problem of the third-order components of the cabin noise at 1200 rpm, the main contribution is the radiated noise of the intake system. The main contribution to the problem at 1600 rpm is from the structural-born noise of the mounting system and the intake system.