【摘要】 对某前向多翼离心通风机的辐射噪声进行了近场测量,给出声压级频谱图并进行了噪声源的识别。试验结果表明,除通常的旋转噪声和涡流噪声外,在某些条件下还可能存在与旋转噪声数量级相同甚至更高的蜗壳声腔共鸣噪声,在风机降噪研究中也应对此予以足够注意。更多还原

【Abstract】 Near-field sound pressure measurements were performed around a forward-swept multi-blade centrifugal fan. The sound pressure levels at every measurement position were plotted on charts for a wide range of frequency, and the different noise sources were preliminarily distinguished. The test results show that the blade passage frequency noise is really one of the main noise sources, and the acoustic resonance of fan volute is also very important because it sometimes has the same sound pressure level as the blade passage frequency noise.更多还原