论文部分内容阅读
本文提出了一种在密闭管中测量线阵的自由场复数灵敏度和指向性图的方法。在管中沿管轴方向布置一系列发射换能器和监测水听器 ,根据实测得到的传递函数矩阵和所要模拟的平面波频率、幅度和入射角计算得到一组发射换能器驱动信号的幅度和相位 ,然后以此信号激励每个发射换能器 ,就能在管中形成一个等同于任意角度入射的自由场平面波声场的声压分布。已经开发了一个初型实验系统 ,系统频率范围 2 0～ 6 0 0Hz ,管中所得的测量结果与理论曲线符合很好
In this paper, a method of measuring the free-field complex sensitivity and directivity map of a linear array in a closed tube is proposed. A series of transmitting transducers and monitoring hydrophone are arranged along the tube axis along the tube axis. Based on the measured transfer function matrix and the frequency, amplitude and incident angle of the plane wave to be simulated, the amplitudes of driving signals of a group of transmitting transducers are calculated And phase, and then using this signal to excite each transmitting transducer, a sound pressure distribution in the tube that is equivalent to the free-field plane wave sound field incident at any angle can be formed. A prototype experimental system has been developed with a system frequency range of 20-600Hz and the results obtained in the tube are in good agreement with the theoretical curve