基于统计能量分析的车内高频噪声能量流研究

Research on Energy Flow of High Frequency Internal Noise in Vehicle Based on Statistical Energy Analysis

为研究某款乘用车内高频噪声特性,利用统计能量分析方法构建了包括车身结构子系统及车内、车外声腔子系统的乘用车车内噪声计算模型。计算结果表明:两种激励同时输入时,驾驶员头部的噪声主要由防火墙前部声腔透过防火墙传入到车内,而防火墙前部声腔内的噪声能量主要来源于发动机处声腔激励以及从发动机周围绕行传递的进气噪声。

To study the characteristics of high frequency noise inside a passenger vehicle,a statistical calculation was employed to build a noise model,including the vehicle body structural subsystem,the internal and external sound chambers.The calculation results show that when two kinds of stimulations are input at the same time,the noise that concentrated on the driver’s head mainly comes from the front acoustic chamber of the firewall which transmitting to the car through the firewall.The noise energy in the front acoustic chamber is mainly derived from the acoustic chamber at the engine and intake noise around the engine’s circumference.