The Research On Ultra-lowfrequency Bender Disk Transducer

According to the theory of the classical bending disc transducer,for the ordinary bending disc transducer,it is known that the larger the radius of ceramic disc,the smaller the frequency of the bending disc,the higher the response.But because of the limitation of production cost and difficulty,the size of the ceramic film cannot be very large.So in order to achieve a lower frequency,people no longer only improve the radius of the ceramic pieces,but use the structural changes.In order to achieve low frequency,this paper proposes to use multiple small piezoceramic discs to replace a large ceramic piece to drive large size metal discs,so as to solve the problem that the size of ceramic sheets cannot be larger,due to the limitation of technological level.The main research content of this topic is to verify whether the idea of replacing big ceramic with small ceramic chips is feasible.Under this assumption,the finite element analysis method is used to analyze the displacement curves of the classical bending disc transducer and two ultra-low frequency bending disc transducers arranged in circular and square arrangement.The feasibility of the ultra low frequency bending disc transducer is proved.Then the design of ultra low frequency bender disk transducer using ANSYS finite element software,analyzes the number and arrangement of ceramic ring number and metal structure size change rule for resonance frequency and transmitting voltage response,the ceramic ring arrangement number and structure size better.Finally,the test prototype of the flexural disc transducer is made and processed according to the software design,and the performance of the prototype is tested.Through the performance test of the bending disc transducer prototype,the resonant frequency of 230 Hz in the water is obtained,the maximum transmitting voltage is 128.9dB,and the maximum sound source level is 178.9dB.The feasibility of the design of the flexural disc transducer driven by large ceramic wafers is verified by a number of small ceramic wafers.Finally,the size of the prototype is amplified by multiple sizes.A super low frequency bending disc transducer with a diameter of 984 mm and a resonance frequency of 77 Hz is designed.It is verified that the design scheme of ultra-low frequency bending disc transducer driven by multiple ceramic discs is feasible.