一种带障板宽波束宽带纵振动换能器

介绍了一种带障板宽波束宽带纵振动换能器。通过将纵振动换能器的纵振动模态和前盖板弯曲振动模态有效耦合来达到拓宽换能器工作频带的目的;并提出利用反声障板边界结构大幅度增大发射波束宽度的方法。利用有限元软件分析了其在水中的特性。分析结果表明,通过纵弯模态耦合方式可有效拓宽换能器的频带宽度;通过障板在纵振动换能器中的应用可有效调节纵振动换能器的波束特性,从而实现宽波束的目的。实际制作该换能器并测试了其在不同情况下的性能,测试结果表明:有限元分析结果跟实验测量结果吻合。在9.5~18 kHz的频率范围内实现了发送电压响应起伏不超过3 dB的宽带工作;在11、12、13、14 kHz,实现了120°~160°的宽波束。

A kind of wide-beam broad-band longitudinal vibration transducer with a baffle plate

In this paper, a kind of wide-beam broad-band longitudinal vibration transducers with a baffle plate is introduced. By the effective coupling of the longitudinal mode caused by the whole transducer and the flexural mode caused by the head mass, the transducer shows a broad-band performance. Furthermore, the conception of utilizing baffle plate boundary structure to realize the wide-beam of the transducer is put forward. On the basis of FEM software, the transducer electro-acoustic capability is analyzed. The FEM analysis result indicates that the band-width is effectively extended by using the two modes coupling method and the directivity of the transducer can be controlled by adjusting the distance between the baffle plate and the radiating head mass, so that it shows a wide-beam performance. The transducer is manufactured and measured in different conditions. From the experiment result, the fluctuation of the transmitting voltage response of the transducer in the operation frequency band does not exceed 3 dB. At the frequencies of 11kHz, 12kHz, 13kHz, and 14kHz, the -3dB beam-width of the transducer reaches 130~160 degree.