发动机排气噪声的仿真预测和实验研究  

Simulation Prediction and Experimental Study on Exhaust Noise of Engine

作　　者：刘勇强[1] 左承基[1] 黎幸荣[1] 

机构地区：[1]合肥工业大学,合肥230009

出　　处：《中国机械工程》2011年第14期1664-1668,共5页China Mechanical Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2005AA501301)

摘　　要：为了预测发动机的纯排气噪声,利用GT-Power软件建立了发动机的整机模型,通过发动机台架实验对建立的模型进行了标定,在相同工况下分别对发动机纯排气噪声进行了仿真计算和实验研究。研究结果表明:该模型在发动机纯排气噪声预测方面具有足够的精度;1500r/min和2500r/min时的噪声峰值出现在63Hz低频段,1500r/min时的噪声峰值大于2500r/min时的噪声峰值;随着发动机转速的升高,噪声峰值向中高频转移,中高频噪声比例也加大。A simulation model of engine was established by using GT-Power software for predicting pure exhaust noise of engine,which was demarcated by engine tests.Simulation calculation and experimental study for the pure exhaust noise of engine were carried out under the same operating conditions.The research results show that the engine model established for pure exhaust noise prediction is accurate.The pike noise values of 1500r/min and 2500r/min are in 63Hz frequency and the pike noise value of 1500r/min is stronger than that of 2500r/min.With the engine speed increasing the pike value of noise transforms to the middle or high frequency and the middle to high frequency noise increases more rapidly than low frequency noise.

关 键 词：发动机 排气噪声 计算机仿真 噪声测量 隔声罩 

分 类 号：U464.171[机械工程—车辆工程]