Study on Driving Methods of Magnetostrictive/Piezoelectric Hybrid Janus-Helmholtz Transducer

A study on driving methods of magnetostrictive/piezoelectric hybrid Janus-Helmholtz (JH) transducer is carried out. Modal analysis of the hybrid Janus transducer is done at first. It is proved that two effective characteristic modes could be generated, which could be designed to expand the working bandwidth by multiple-mode-coupling technique. The hybrid transducer can be driven in four ways by one driving element while the other driving element is in short circuit state or open circuit state. On this basis, change regularities of the performance of hybrid Janus and JH transducer driven in four ways are studied in detail. Besides, corresponding physical interpretations are also given why the performance changing with different circuit state of driving element. It is confirmed by the predicted results that at least three working modes of the hybrid JH transducer could be used to achieve effective mode coupling and the -6dB working bandwidth could be over two octaves. This new hybrid JH transducer has a series of advantages such as low frequency, wide band and high power.