Anderson Brian E, Hughes W Jack, Hambric Stephen A
Applied Research Laboratory, The Pennsylvania State University, PO Box 30, State College, Pennsylvania 16804, USA.
J Acoust Soc Am. 2008 May;123(5):2613-9. doi: 10.1121/1.2890738.
The ability to direct sound energy through the flexural vibrations of a submerged plate at various angles of incidence using a near-field transducer array is investigated. An alumina bar is placed in front of a one-dimensional, eight-element transducer array, between the array and the water. Operating in a receive mode, data were taken as a function of angle of incidence and compared to data taken without the presence of the alumina bar. The array was also operated in transmit mode and results were compared to corresponding receive mode data, showing that reciprocity holds. Results show that in fact sound energy can be steered through a plate, and that the measurement method used provides a convenient method of measuring the angular dependence of transmission through a plate, including measurements at frequencies above the plate's critical frequency. Experimental results of sound transmission versus angle of incidence of finite sized plates agree qualitatively with theoretical results from an analysis of the transmission through an unbounded flexible partition.
研究了使用近场换能器阵列以不同入射角通过浸没板的弯曲振动来引导声能的能力。将一根氧化铝棒置于一维八元件换能器阵列前方，在阵列与水之间。在接收模式下运行时，采集了作为入射角函数的数据，并与不存在氧化铝棒时采集的数据进行比较。该阵列还在发射模式下运行，结果与相应的接收模式数据进行比较，表明互易性成立。结果表明，实际上声能可以通过板进行引导，并且所使用的测量方法提供了一种测量通过板的传输角度依赖性的便捷方法，包括在高于板的临界频率的频率下进行测量。有限尺寸板的声传输与入射角关系的实验结果与通过无界柔性隔板传输分析的理论结果在定性上是一致的。
