Analysis And Research On The Coupling Resonance Performance Of Ultrasonic Vibrator And Metal Spherical Shell

As an important part of urban lifeline,the leakage of water supply network not only cause a lot of economic losses,but also cause a series of problems such as ground collapse and endanger people's life and property safety.So it is very important to detect and locate the leakage of it.The leakage detection ball is applied to the detection of water supply network because of its convenient use and not damage to the pipeline.As the core part of it,ultrasonic plays an important role in the tracking and positioning of the ball in the pipeline and the error correction of the leakage point.This paper in order to reduce the loss of energy,improve the perspective of effective electromechanical coupling coefficient,considering the influence of the material,shape,size and the contact state of piezoelectric ceramics and spherical shell,the variation law of vibration and admittance characteristics it is analyzed,and the coupling resonance characteristics it under different factor levels is studied.The structural design and performance parameter selection under the optimal level condition is completed.The research contents of this paper are as follows:1.Through the analysis of the properties of piezoelectric materials,the characteristic parameters are studied and PZT-4 material was selected.The piezoelectric equation is analyzed,and the piezoelectric performance parameters and the parameter matrix model under the anisotropic polarization are established.Based on piezoelectric theory and finite element analysis,the electromechanical coupling characteristics of composite piezoelectric vibrator are studied,and dynamic characteristics analysis model is established.2.The dynamic characteristics of the arc contact surface and the plane contact surface composite piezoelectric vibrator structural are studied.The relevant factors influencing the coupling resonance of them are analyzed,and the orthogonal experiment is designed.The modal and harmonic response of the arc contact surface and the plane contact surface composite piezoelectric vibrator are analyzed by the finite element method.The modal shape and radial resonance frequency of the composite piezoelectric vibrator are studied by modal analysis,and the amplitude and admittance characteristics under the excitation voltage are studied by harmonic response analysis.3.Used the method of extremum and variance analysis to analyze the indexes of orthogonal experiment,the influence characteristics of arc contact surface and plane contact surface composite piezoelectric vibrator in each factor and level are studied.And the optimal level design of them are completed.Finally,through the comparative analysis of the performance indexes of them,it is concluded that the arc contact surface composite piezoelectric vibrator has better performance.4.By using the finite element analysis and experiment method,the performance parameters of arc contact surface and plane contact surface composite piezoelectric vibrator are measured.The results show that the arc contact surface composite piezoelectric vibrator has better performance,which is consistent with the simulation results.Through establishment of the experimental platform to study the influence of the coupling agent on the performance of the composite piezoelectric vibrator,it is concluded that the composite piezoelectric vibrator structure with epoxy resin as the coupling agent has better performance.Figure [45] table [30] reference [62]...