【摘要】 本文提出了在普通房间中利用双传声器对多孔性和纤维性吸声材料吸声系数测量时的参数识别方法。利用Delany&Bazley经验模型对测量数据进行了参数识别,建立了材料的阻抗模型,并计算出材料全频带的吸声系数。与驻波管方法得到的吸声系数相比,在0～3000Hz范围内,二者都能较好地吻合。通过在不同的环境中进行对比测试,说明该方法具有较好的重复性和准确性。更多还原

【Abstract】 A parameter identification method to measure absorption coefficients of porous and fibrous materials using two microphones in an ordinary room is proposed.The Delany & Bazley model was used for parameter identification.The impedance of the material was established and absorption coefficent in the whole frequency domain was calculated.In the range of 0～3000Hz,the measured results of this method for two real materials agree well with the absorption coefficients measured in impedance tube.The repeatability and accura- cy of the method are proved by comparing measurements in different environments.更多还原