Research On Ultra-low Frequency Bender Transducer

Ultra-low frequency transducer is an important research direction in the field of underwater acoustic transducer,which can be used in the fields of remote acoustic propagation,ground acoustic research and submarine noise simulation.The curved transducer is a typical representative of low frequency and small size transducer.At present,it is difficult to realize ultra-low frequency operation with conventional bending transducer due to the limitation of ceramic size.To solve this problem,the paper plans to use multiple ceramic discs to drive the ultra-low frequency bending transducer,which is of great significance in engineering application.In this paper,a multi-chip ceramic driven ultra-low frequency bending disk structure is proposed.Then the finite element analysis of the bending vibration mode of the disc transducer is carried out.Then,the finite element software is used to explore the ceramic arrangement rules of several small ceramic disc transducers,and find out the arrangement rules and the mechanism of ceramic drive.After that,the inverse additive electrical model was proposed and the reasons for its occurrence were explained.Then the finite element software is used to simulate the transducer,and the structure of the transducer is optimized.Finally,the production and process of the transducer were studied,and the transducer was made and assembled,tested and compared with the simulation results.The ultra-low frequency bending transducer designed and manufactured in water has a resonant frequency of 71 Hz,a transmitting voltage response of 123.6d B,and a maximum sound source level of 177.5d B.The results show that the problems in the development of the bent disc transducer are solved in this paper:Using the multi-slice ceramic to drive the transducer can make the ultra-low frequency bending disc transducer realize the high-power transmission.