Abstract
Researches about high-power, low-frequency projectors are the most important technology for long range sonar systems. Flextensional transducer is a typical low-frequency, high-power projector, which has the advantages of small volume and light weight due to displacement amplification. In this paper, attention is focused on expanding bandwidth of the flextensional transducer. Class I flextensional transducer usually consists of a slotted convex shell and a driving stack. There are two kinds of main vibration modes at low frequency, the first flexural mode and the membrane mode. They can be coupled and broadband transmitting response was obtained. Finite element (FE) techniques are applied to the design of this multiple-mode-coupling transducer. Finite element model was made with ANSYS software and it can be used to do vibration mode analyze, operative mode simulation and structure optimization. Base on the analyze results, the multiple-mode-coupling flextensional transducer was designed and tested. Key words: flextensional transducer; broadband; multiple-mode-coupling; Finite Element Method
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