A Low Frequency Ring Transducer Driven By Flextensional Structure

Ring transducer possesses the advantages of horizontal nondirectional,but its resonant frequency is difficult to achieve below 1 KHZ.This paper presents a new kind of low-frequency ring transducer driven by flextensional structure,and the high compliance coefficient of the flextensional structure can be used to achieve the low frequency and small size launch.The transducer are analyzed in theoretical research,simulation,optimization design and production of experimental prototype testing verification,etc.Firstly,the long,short axial displacement and displacement magnification of the flextensional structure is first deduced by using the discretization model of the flextensional structure.For the first time,the short axial displacement under the short axial force of the flextensional structure is deduced,namely,the short axis direction coefficient.The above results are consistent with the simulation results,and the effects of variation of each parameter on the above results are studied.Secondly,the flextensional structure is regarded as a one-dimensional rod,and the telescopic displacement of the rod is transmitted through the connectome to the radiant surface,which promotes the radiation of the radiation surface.the equivalent concentration parameters such as the compliance coefficient and electromechanical conversion coefficient of the transducer are solved by means of equivalent circuit method.The radiation impedance of transducer is solved by using equivalent sphere model.The equivalent circuit model of transducer is given to solve the resonant frequency and the transmitting voltage response of the transducer.Then,using ANSYS finite element software,the modal and harmonic response analysis of transducer are carried out,and the consistency between theory and simulation is verified by comparing with the theoretical results.Changing the parameter values for simulation calculation,The influence of each parameter on the radiation performance of transducer is studied by combining the theoretical model.The transmission voltage response of two different parameters of aluminum shell and resin shell is given.Finally,Using 3D printing for processing,the experimental prototype of the resin material shell was made,and the voltage response in the air was tested.The resonant frequency was 380 Hz,and the maximum voltage response was 30 dB.Consistent with the simulation results.Ring transducer driven by flextensional structure can realize low frequency and small size radiation.Compared with the polygon Terfenol-D transducer with same frequency,the volume is only One half to A quarter.