在管道消声系统中水雾吸声的实验研究

关于水雾对声波的吸收作用,前人已做了大量的研究工作。研究的目的是如何将水雾对声波的吸收这一现象应用到管道消声中来,并通过搭建实验平台验证其可行性。实验中水雾的产生是通过5个超声换能器来实现,且其雾化量的大小可通过改变电压来控制。实验方法是采用传递损失法,即验证水雾的存在与否对声波是否具有吸收作用。实验的结果表明在雾柱长度1m左右,对频率为200Hz以上的声波具有吸收作用,且频率越高,吸收越强烈。鉴于实验结果的良好性,以及雾化量的可控性,实验的方法可望推广到管道的主动噪声控制中。

Experimental research of sound absorption by water fog in duct sound elimination system

Much has been done on absorption of sound in water fog.The goal of this paper is to apply the phenomena "absorption of sound in water fog" to duct sound elimination system.In the experimental setup,the water fog is produced by 5 ultrasonic transducers.The fog quantity is controlled by altering the voltage.The method used in this experiment is to measure the transfer loss.The experimental results indicate that the water fog can effectively absorb sound above 200Hz.The higher the frequency,the stronger the absorption is.Based on the good experimental results and the controllability for the degree of water fog,the proposed method is useful in extending the field of active noise control in duct system.