Sandwich Piezoelectric Ultrasonic Transducer Design And Vibration Performance Research

Ultrasonic transducer is a device for energy conversion, which can achieve energy conversion between electric energy and ultrasonic energy. Ultrasonic transducer is the center of ultrasonic technology, which determines the key factors in the performance of ultrasonic systems. Sandwich piezoelectric ultrasonic transducer has been used widely in the field of power ultrasonic for its excellent performance. Based on the in-depth study of piezoelectric science, ultrasonic science and dynamic mechanics, this paper designed sandwich piezoelectric transducer design for the structure and researched the vibration performance of design model in use of FEA software COMSOL Multiphysics. This research work has been divided into five components below.(1) After collecting imformation about ultrasonic, this paper reviewed development of ultrasonic technology and introductioned the principle of ultrasonic cleaning technology briefly.(2) Researching the theory of piezoelectric science, ultrasonic science and dynamic mechanics theory, Equivalent circuit was established by using piezoelectric transducer electro-mechanical equivalent model. Furthermore, this paper gived resonance frequency function, velocity ratio and input equivalent admittance.(3) Designing the piezoelectric transducer for the detailed structure according to theoretical calculated results and this paper analysised eigenfrequency, frequency responce in the use of FEA software COMSOL Multiphysics. On this basis, draw the air piezoelectric transducer frequency and characteristics of each order vibration mode map, to find out thelongitudinal vibration frequency and mode. Analysis of the transducer two reference points on the vibration amplitude and excitation frequency relationship and come to the reference points A, B the amplitude frequency response curve. Input conductance of the transducer is satisfied with the frequency to analyze the relationship, have been satisfied transducer input conductance response curve and found that there is a positive in the vicinity of the resonant frequency of the resonant frequency and resonant frequency of the reverse point.(4) Analysis of transducer acoustic field distribution underwater based on the frequency response of piezoelectric transducer. This article has been in the water satisfied transducer input conductance frequency response curve. Select the sound fieldcalculated reference point to analyze the launch of the transducer voltage response. This further analysis of the transducer spatial directivity. In front of the transducer radiating sound field with water for analysis at the interface area, got in a 40 kHz excitation frequency sound pressure along the interface of the distribution curve, and along the interface of the von Mises stress distribution curve.(5) The establishment of 2D finite element analysis model of ultrasonic cleaning, the research of coupled vibration between longitudinal vibration of transducer and bending vibration of steel plate, coupled vibration structure radiated acoustics field and structure of the acoustic load suffered. Studied longitudinal vibration transducer and sink at the end of the coupling plate bending vibration, and vibration of the structure coupled acoustic field and structure of the sound suffered load. This has been a sink in the sound pressure (level) distribution, and analysis of the sound field distribution of the cleaning effect. This further sound - the vibration of the structure of the interface displacement distribution and stress distribution were analyzed by the interface of the vibration displacement amplitude curve analysis of the longitudinal piezoelectric vibration transducers and tank bottom plate bending coupling.