发动机排气噪声有源消声技术研究

Study on Active Control Noise Technique for Engine Exhaust Noise

排气噪声是发动机主要的噪声源之一。有源消声技术是运用数字信号处理技术实现声波相消干涉达到电控消声目的,它已成为近年来发动机排气噪声治理领域备受关注的一个热点。为此,主要研究了有源消声技术在发动机排气降噪方面的应用,并对其进行了模拟实验。结果表明,有源消声技术具有明显的降噪效果。

Engine exhaust noise is an important source of the engine noise.The active control noise（ANC）technique can offset the limitations of muffers,which eliminate the noise by interference of sound wave under the help of Digital Signal Processing technique.ANC technique has become a hotspot in noise reigning region of engine exhaust in recent years.The applications of active control noise technique in reducing the engine exhaust noise will be mainly researched in this paper.Finally experiments on interference noise elimination technology of sound wave have been carried out.The analysis results indicated that interference noise elimination technology has obvious effects on noise reducting.