一种新型发动机装饰罩的开发研究
查亮
(上海汽车集团股份有限公司 商用车技术中心,上海 200438)
摘要:为集成传统发动机装饰罩美化前舱、防尘防油污与发动机声学包件吸音降噪的作用,设计了发动机吸音罩,并通过试验研究其降噪性能。介绍了发动机吸音罩与现有的发动机装饰罩的结构,并对比分析其各自优缺点;说明了发动机吸音罩使用材料的微观结构、吸音原理及生产工艺。结合实车零件开发案例,首先,对吸音罩覆盖范围进行划定,将不同厚度、密度的片材进行对比测试,确定合适的材料选型及包覆方案;然后综合考虑工艺性、装配性和降噪要求设计三维数据并制作软模验证;最后,进行车内噪声试验,对比验证其降噪效果。试验表明,发动机总声功率级降低1.3 dB(A),并对多个频带噪声均有作用,有效提高了整车声品质。
关键词:吸音罩;发动机噪声;被动降噪;聚氨酯
中图分类号:U464 文献标志码:A doi:10.3969/j.issn.1006-0316.2020.05.012
文章编号:1006-0316 (2020) 05-0075-06
Development and Research of a New Type of Engine Decorative Cover
ZHA Liang
( SAIC MOTOR Commercial Vehicle Technical Center, Shanghai 200438, China )
Abstract:In order to integrate the function of traditional engine decorative cover to beautify the engine cabin, dust and oil proof, and the effect of sound absorption and noise reduction of engine acoustic package, an engine sound absorption hood was designed, and its noise reduction performance was studied through experiments. The structure of he engine sound absorber and the existing engine decorative cover are introduced, and their advantages and disadvantages are compared and analyzed. The microstructure, sound absorption principle and production process of the material used in the engine sound absorber cover are explained.Combining with the development case of real vehicle parts, firstly, the coverage of sound absorber is delimited, and the sheets with different thickness and density are tested and compared to determine the suitable material selection and coating scheme; secondly, considering the requirements of technicality, assembly and noise reduction, 3Dmodel are designed and the soft model verification is made; lastly, the in-vehicle noise experiments were conducted to verify the effectiveness of noise reduction. The test results show that the total sound power level of the engine is reduced by 1.3dB (A) and the noise of multiple frequency bands is effective to improve the sound quality of the vehicle.
Key words:sound absorption hood;engine noise;sound arrester;polyurethane (PUR)
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收稿日期:2019-08-13
作者简介:查亮(1990-),女,江苏南通人,硕士,工程师,主要从事发动机附件开发设计工作,E-mail:ZhaLiang@saicmotor.com。
 

 

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