Department of Applied Ocean Physics and Engineering, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA.
J Acoust Soc Am. 2023 Jul 1;154(1):307-322. doi: 10.1121/10.0019716.
A theoretical model for predicting the acoustic field scattered by an elastic cylinder that is partially insonified by a directional transceiver is proposed in the form of a simple approximate one-dimensional integral. This model accounts for spherical spreading and directivity of the incident waves and extends the formulation used in a preceding article [Gurley and Stanton, J. Acoust. Soc. Am. 94, 2746-2755 (1993)] by including effects due to oblique insonification of a long cylinder assuming negligible end-contributions. The scattered field of an infinitely long cylinder for obliquely incident plane waves and point receivers is used to approximate the apparent volume flow of cylinders partially insonified by directional transceivers. The scattered pressure that is derived using the apparent volume flow, in contrast to the previous formulation, is capable of predicting axially propagating guided wave resonances; these natural modes are excited, in addition to circumferential ones, at off-normal incident angles. The model is compared with exact numerical simulations and with previously published as well as new laboratory data. The analysis illustrates the different realistic effects associated with scattering from elastic cylinders insonified by a directional transceiver both theoretically and experimentally.
提出了一种预测弹性圆柱部分被指向性收发器声辐射的声场的理论模型，其形式为简单的近似一维积分。该模型考虑了球形扩展和入射波的指向性，并通过包括长圆柱的斜入射的影响（假设末端贡献可以忽略不计），扩展了前文[Gurley and Stanton, J. Acoust. Soc. Am. 94, 2746-2755 (1993)]中使用的公式。对于斜入射平面波和点接收器的无限长圆柱，使用散射场来近似由指向性收发器部分声辐射的圆柱的表观体积流。与之前的公式相比，使用表观体积流导出的散射压力能够预测轴向传播的导波共振；除了周向模式之外，在非垂直入射角度下也会激发这些自然模式。该模型与精确数值模拟以及以前发表的和新的实验室数据进行了比较。分析说明了与弹性圆柱被指向性收发器声辐射相关的不同实际影响，从理论和实验两个方面进行了说明。
