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提出了一种在充水阻抗管中,应用传递函数测量材料声学性能的三参数校准方法。在双传感器传递函数法的基础上,考虑充水阻抗管中水听器间不一致性和管内结构对声场局部扰动等因素的校准,导出了三个综合的无量纲校准参数。通过改变充水阻抗管中测量面的三个已知反射系数,测量出对应的三个传递函数,可以求出这三个校准参数。在充水阻抗管中分别对水/空气界面和一种水声材料进行了测量试验,应用该方法对测量结果的进行了校准,并对校准前后的结果进行了分析比较。
A three-parameter calibration method for measuring the acoustic performance of materials in a water-filled impedance tube by using a transfer function is proposed. Based on the two-sensor transfer function method, three integrated non-dimensional calibration parameters are derived by considering the inconsistencies between hydrophone in water-filled impedance tube and local disturbance of sound field in pipe structure. The three calibration parameters can be found by changing the three known reflection coefficients of the measuring surface in the filled tube and measuring the corresponding three transfer functions. The water / air interface and an acoustical material were measured respectively in water filled impedance tubes. The method was used to calibrate the measurement results and the results before and after calibration were compared and analyzed.