基于声压移相的测量吸声系数的一种新方法  

A new method to measure the absorption coefficient based on sound pressure shifting

作　　者：朱从云[1] 杜虹[1] 黄其柏[2] 

机构地区：[1]中原工学院机电学院,郑州450007 [2]华中科技大学机械科学与工程学院,武汉430074

出　　处：《机械设计与制造》2009年第11期184-185,共2页Machinery Design & Manufacture

基　　金：国家自然科学基金资助项目(50075029)

摘　　要：吸声系数是表征吸声材料吸声性能的一个重要参数。传统的吸声系数测量方法主要有驻波管法和混响室法,而驻波管法和混响室法都存在着一些缺陷。用两个麦克风作为传感器等间距布置在吸声材料的正前方,将两个麦克风传感器所测得的电压进行移相并相互叠加,得出了吸声材料的反射系数,从而得到吸声材料的吸声系数。最后对某一吸声材料进行了实验,并将实验结果与驻波管法以及混响室法测得的结果进行了对比,结果表明该方法理论的正确性与可行性。Absorption coefficient is an important parameter of the absorption function of the absorption material. Traditional methods to measure absorption coefficient are standing wave tube and reverberation which have some shortcomings. The phase of the sound pressure measured by two equal distance microphones placed in front of the absorption material is shifted and spliced in order to attain the absorption coefficient. In the last,an experiment for one absorption material is carried out,the experiment results compare with the results of the other method above mentioned,the result denotes that the theory is correct and practicable.

关 键 词：吸声系数 驻波管 混响室 电压移相 

分 类 号：TH16[机械工程—机械制造及自动化] TB556[理学—物理]