摘要
对汽轮发电机组进行了噪声测试和频谱分析,确定噪声带宽集中在80-2500Hz;基于声学理论,研究了穿孔板的共振频率和最大吸声系数之间的关系,分析了这些结构参数对吸声性能的影响,从中优选的穿孔板与实验值相比较;为进一步加宽吸声频带,将穿孔板和吸声材料组合,建立了复合吸声结构和优化参数的数学模型,并根据机组的噪声特性确定了空腔厚度和吸声材料的容重,从而为汽轮机组等高噪声电力设备的降噪提供了理论和实际的依据。
A frequency spectrum of noise is measured to determine the noise source whose frequency band is 80-2500Hz. Based on the acoustic theory, the relation of resonance frequency and sound absorption coefficient is studied, and the structure parameters＇ influence on the absorbing characteristics for low and mediate frequency is analyzed. A kind of perforated panel with 80-630Hz frequency band is chosen and a comparison between the calculating results and the testing results is made. The perforated panels are connected with the sound absorption materials in order to widen the frequency band. The compound absorbing structure and its optimum mathematical model are constructed and the optimum results are calculated based on the frequency band of sound. The wide frequency compound sound-absorbing structure provides the theoretical and factual basis for noise control of turbo-generator and other electrical machines.
出处
《噪声与振动控制》
CSCD
北大核心
2006年第4期80-83,共4页
Noise and Vibration Control
关键词
声学
汽轮机组
穿孔板
噪声控制
吸声系数
acoustics
turbo-generator
perforated panels
noise control
sound absorption coefficient
