Simulation of Janus Transducer Driven by Flexural Beam

A compact Janus transducer driven by flexural beam is presented in this paper. It could reduce the resonance frequency of transducer by using the flexural mode of the beam, and achieve medium sound power and wide band acoustic radiation performance. Using the finite element method (FEM), the optimization of electroacoustic parameters such as transmitting voltage response (TVR) is carried out. It is shown that the TVR of transducer could be improved effectively by adjusting the position of the beam and the material of the flexural beam and head mass, and the working bandwidth would also be expanded because the first order and second order modes could be coupled efficiently. The working modes of the optimized transducer are studied. The first and second resonance frequencies of the transducer are 1.1 kHz and 2.5 kHz respectively. The maximum TVR is greater than 125dB. The directivity pattern of the transducer is also studied. It is shown that the sound field of the transducer is similar to the superposed radiation of two in-phase spheres. This transducer could be used for oceanographic applications as well as underwater communication.