作者：胡溧¹, 何一鸣¹, 杨啟梁¹, 王佳²

作者单位：1. 武汉科技大学汽车与交通工程学院, 湖北 武汉 430065;
2. 东风商用车技术中心, 湖北 武汉 430000

关键词：发动机缸体;蠕墨铸铁;声能量;力-声能量转换效率;模态参与因子

摘要：

为准确分析蠕墨铸铁发动机缸体噪声辐射特性，基于LMS Test.Lab软件，使用力锤冲击激励法分别对灰铸铁和蠕墨铸铁铸成的发动机缸体进行振动噪声测试，基于理论推导出的力能量和声能量计算公式，使用激励力加权系数法进行加权分析。分析结果表明，被测的蠕墨铸铁发动机缸体力-声能量转换效率比灰铸铁发动机缸体力-声能量转换效率低35.43%，降噪性能优于灰铸铁发动机缸体。此研究表明力-声能量转换效率分析方法可以很好地分析不同材料发动机缸体的噪声辐射性能，为改善发动机缸体的噪声辐射性能提供理论基础。

Measurement and analysis of noise radiation of vermicular cast iron engine block
HU Li¹, HE Yiming¹, YANG Qiliang¹, WANG Jia²
1. College of Automobile and Traffic Engineering, Wuhan University of Science and Technology, Wuhan 430065, China;
2. Dongfeng Commercial Vehicle Technical Center, Wuhan 430000, China
Abstract: In order to accurately analyze the noise radiation characteristics of vermicular cast iron engine block, the vibration and noise of gray cast iron and vermicular cast iron block were tested by force hammer impact excitation method based on LMS Test.Lab software. Based on the formula of force energy and acoustic energy derived theoretically, the weighted analysis of excitation force was carried out by using the method of excitation force weighting coefficient. The analysis results showed that the force-acoustic energy conversion efficiency of vermicular cast iron engine block was 35.43% lower than that of gray cast iron engine block. And the noise reduction performance was better than that of gray cast iron engine block. This study shows that the analysis method of force-acoustic energy conversion efficiency can analyze the noise radiation performance of engine blocks with different materials, lay a foundation for improving the noise radiation performance of engine blocks, and provide reference for practical engineering application.
Keywords: engine block;vermicular cast iron;acoustic energy;force- acoustic energy conversion efficiency;modal participation factor
2020, 46(2):131-136  收稿日期: 2019-09-23;收到修改稿日期: 2019-10-27
基金项目: 国家自然科学基金项目（51105283）
作者简介: 胡溧(1977-),男,湖北武汉市人,教授,博士,研究方向为汽车NVH及声品质
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