李运江.离心风机蜗壳共振频率的探讨[J].声学技术,2007,(3):464~466 |
离心风机蜗壳共振频率的探讨 |
Acoustic resonance frequency of volute casing of centrifugal fans |
投稿时间:2005-11-22 修订日期:2006-02-06 |
DOI: |
中文关键词: 共振频率 离心风机 蜗壳 |
英文关键词: resonance frequency centrifugal fan volute casing |
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中文摘要: |
在一些吸声系数和体积较小的工业厂房通风及空调系统中,当风机稳定的频率与房间简正频率相近时,房间会出现强烈和持续的低频嗡声。风机蜗壳共振时出现较大的噪声峰值。根据离心风机蜗壳的声学特点,通过电-力-声类比线路和其数学模型分析,推导出蜗壳结构的两个声学共振简正频率,并与已有文献提供的试验数据进行了比较,结果显示两个共振简正频率之一与蜗壳进气口几何尺寸无关。 |
英文摘要: |
In ventilation and air conditioning systems in small industrial workshops without sufficient sound absorption capability, strong and continual low-frequency buzz occurs. When the stable frequency of centrifugal fans is close to the natural frequency of the room and the volute casing is under resonance, a peak value of noise appears. Based on the acoustical characteristics of volute casing of centrifugal fans, the analogous circuitry of electricity-mechanics-acoustic and mathematic model is analyzed. Two resonance frequencies of volute casing are derived, one of which shows no correlation with inlet geometry dimension. |
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