Acoustic Impedance in a Rigid‐Walled Cylindrical Sound Channel Terminated at Both Ends with Active Transducers
Acoustic Impedance in a Rigid‐Walled Cylindrical Sound Channel Terminated at Both Ends with Active Transducers
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两端带有有源换能器的刚性壁圆柱形声通道中的声阻抗
DOI：
10.1121/1.1919157
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发表时间：
1964
影响因子：
2.4
通讯作者：
L. G. Beatty
中科院分区：
文献类型：
--
作者：
L. G. Beatty
当两个换能器通过声音通道（例如充水钢管）耦合在一起并且以共同频率独立驱动时，可以对由通道呈现给换能器中的任一个的声阻抗施加动态控制。然而，在实际情况下确定该载荷存在相当大的实验困难。对于由对称安装的活塞源激励的理想刚性壁通道，负载阻抗可以用源速度的比率或其阻塞驱动力的比率表示。在低于通道介质内发生径向模式传播的频率的频率下，负载阻抗也可能与纵模的驻波比有关。后一种关系似乎更适合于实际测量。水下声学校准特别感兴趣的是使用主动载荷技术在实际的充水钢管内产生平面行波。
When two transducers are coupled together by a sound channel such as a water‐filled steel tube and independently driven at a common frequency, dynamic control may be exerted over the acoustic impedance presented by the channel to either of the transducers. The determination of this load in the practical case, however, presents considerable experimental difficulty. For the ideal rigid‐walled channel excited by symmetrically mounted piston sources, the load impedances may be expressed in terms either of the ratio of the source velocities or of their blocked driving forces. At frequencies below those for which radial mode propagation occurs within the channel medium, the load impedances may be also related to the standing‐wave ratio of the longitudinal mode. This latter relationship seems better suited to practical measurements. Of particular interest for underwater acoustic calibration is the use of the active‐load technique to produce plane progressive waves inside a practical water‐filled steel tube.