基于四负载最小二乘法的内燃机排气噪声预测  

Exhaust noise prediction of internal combustion engine based on four-load least square method

作　　者：韩悦[1] 刘联鋆[1] 汤汝根 郑旭[1,3] 郑康 HAN Yue;LIU Lianyun;TANG Rugen;ZHENG Xu;ZHENG Kang

机构地区：[1]浙江大学能源工程学院,浙江杭州310027 [2]浙江欧特立汽车空调有限公司,浙江丽水323000 [3]浙江大学能源清洁利用国家重点实验室,浙江杭州310027

出　　处：《现代机械》2022年第4期1-5,56,共6页Modern Machinery

摘　　要：利用四负载最小二乘法提取排气系统噪声源特性,预测排气管道末端排气噪声。为避免在声源截面直接测量声压,通过实验获取排气系统末端管口声压,利用平面波法计算负载传递矩阵,获得声源截面声压;通过末端管口辐射阻抗和计算所得的传递矩阵获得负载阻抗。之后通过四负载最小二乘法提取发动机排气系统内声源声压和阻抗特性,进而利用声源特性对安装某负载时的排气口辐射噪声进行预测。预测结果与实验结果吻合良好。Four-load least square method was used to extract the noise source characteristics of the exhaust system and to predict the exhaust noise at the end of the exhaust pipe.In order to avoid directly measuring the sound pressure at the sound source section,the sound pressure at the end of the exhaust system was obtained through experiments,and the load transfer matrix was calculated by using the plane wave method to obtain the sound pressure at the sound source section.The load impedance was obtained from the terminal radiation impedance and the calculated transfer matrix.The characteristics of sound source pressure and impedance in the exhaust system were extracted by four-load least square method,and the radiated noise at the end of the exhaust pipe was predicted based on the characteristics of the sound source.The prediction results were in good agreement with the experimental results.

关 键 词：四负载法 传递矩阵 声源 排气噪声 

分 类 号：TK421.6[动力工程及工程热物理—动力机械及工程]