摘要
采用整车分别运行法获得发动机排气噪声、发动机燃烧噪声、发动机机械噪声、变速器噪声及其它噪声源噪声,分析发现发动机噪声是整车的主要辐射源,对发动机油底壳和消声器进行了一系列改进。结果表明,改进后的油底壳总成振型有明显改善,各阶频率较改进前有较大的提高,不同转速下,插入损失有较大程度的提高,而功率损失有不同程度的降低,车外加速噪声由原来的77.55d B降到73.28d B,降低了4.27d B。
A respective operating method of whole vehicle is used to obtain exhausting noise, combustion noise, mechanical noise of engine, transmission noise and other noise source, and it is found by analyze that engine noise is a main noise source of the whole car, and a series of developments are done for the oil sump and muffler. Results show that after development the vibrating mode has a obvious improvement and the whole oil sump the frequency is higher than before, on different speed insertion loss is increased greatly, and the power loss decreased in some different extent, and car outside acceleration noise is decreased from 77.55 d B to 73.28 d B, and a drop is 4.27 d B.
引文
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