基于近声场识别法的客车车外噪声降噪

摘要

Noise from outside of the domestic buses is general y on the high side, and has become one of the main sources of noise pol ution in cities. With the buses produced in a factory as the object of study, by using the technology of near sound field identifica-tion, and through operation selecting, the fans and mufflers are found to be the main noise sources. Measures such as structure opti-mization, noise elimination and sound insulation are taken to reduce the noise. Noise from bus acceleration is greatly decreased, which fulfils the international requirements of noise limit outside the buses.%目前国产客车的车外噪声普遍偏高，成为城市中主要噪声污染源之一。以某厂客车作为研究对象，采用近声场识别法对其进行主要噪声源识别，并通过选择运行法，确定了风扇、消声器等主要噪声源对整车噪声的影响。采取了结构优化、消声、隔声等技术措施对主要噪声源进行降噪，使得整车的车外加速噪声明显降低，并满足了汽车加速行驶车外噪声限值的国标要求。