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四边型弯张换能器通常工作带宽较窄,为了提高带宽性能,对四边型弯张换能器振动及辐射特性进行了研究,重点分析壳体结构参数对换能器发送电压响应的影响。根据分析结果提出了拓宽换能器工作带宽的方法,利用有限元软件进行了仿真计算并制作了四边型弯张换能器样机。测量得到在2.4~5 kHz的频率范围内,换能器的最大发送电压响应值达到140 dB,带内起伏4 dB,有限元仿真结果与实验结果吻合较好。研究结果表明设计的四边型弯张换能器不仅能够低频工作,并且可以在小尺寸下实现大功率发射,同时还具备宽带发射特性。
In order to improve the bandwidth performance, the bending and radiation characteristics of quadrilateral bending transducer are studied, and the influence of shell structure parameters on the voltage response of transducer is analyzed emphatically. Based on the analysis results, a method to broaden the working bandwidth of the transducer is put forward. The finite element software is used to simulate and produce the quadrilateral bending transducer prototype. Measured in the frequency range of 2.4 to 5 kHz, the maximum transmit voltage response of the transducer reached 140 dB, the band fluctuation 4 dB, the finite element simulation results agree well with the experimental results. The results show that the designed quadrilateral bending transducer not only can work at low frequency, but also can achieve high power emission in small size and wideband emission characteristics.