摩托车发动机风扇噪声分析

摘要

风扇啸叫声在频谱上可看作是一条随转速升高的谐次噪声,风扇叶片数决定噪声的谐次,风扇叶片不规则分布能降低风扇啸叫声;风扇叶尖的形状影响风扇噪声,合理的叶尖形状设计能大大降低风扇啸叫噪声;不同风扇叶尖形状会使周围空气的流速变化量不同,并产生不同的湍动能,最终产生不同的噪声。%The whistle sound can be regarded as harmonic noise on the frequency spectrum It can be improved with increasing of rotation speed of motorcycle engine. The number of fans determines the level of harmonic noise, and the irregular arrangement of fans can reduce the harmonic noise; the shape of leaf apex of the fan also has the impact on the harmonic noise of fans. The reasonable shape of fans can reduce the harmonic noise of fans. The change of air velocity can generate the different turbulent flows, giving rise to different noise.