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。
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. frequencies of volute casing are derived, one of which shows no correlation with inlet geometry dimension.
出处
《声学技术》
CSCD
北大核心
2007年第3期464-466,共3页
Technical Acoustics
关键词
共振频率
离心风机
蜗壳
resonance frequency
centrifugal fan
volute casing
