Design And Experimental Research Of D₁₅ Mode Single Mode Piezoelectric Deicing Exciter

The problem of aircraft ice accumulation is an important issue in the aviation field.Ice accumulation will bring many negative effects on aircraft structures and operating systems,leading to catastrophic consequences.Ultrasonic deicing is an emerging method of deicing in recent years.It is commonly used to deicing by using piezoelectric transducers as excitation sources to generate ultrasonic waves.The deicing technology is simple in structure,low in energy consumption and easy to implement.The principle is to use the inverse piezoelectric effect of the piezoelectric material to generate mechanical vibration under the drive of an electric signal,and then cause the deformation of the part to be deiced,so as to achieve the purpose of deicing.Based on the ultrasonic theory and piezoelectric theory,this paper studies a d₁₅ mode single-mode omnidirectional SH wave transducer through a combination of numerical simulation and experiment,and completes its parameter design through numerical simulation,and its performance and deicing The effect is studied,and the main research contents are as follows:Based on the basic equations of elastic wave theory,the SH wave equation in isotropic media is derived,the theoretical model of SH wave propagation in free plate media is established,and the SH wave dispersion equation is given.The steady-state characteristics of the piezoelectric transducer are analyzed using the equivalent circuit,and the relationship between its impedance and admittance is given.On this basis,the admittance diagram of the piezoelectric transducer is obtained.The design scheme and working principle of the d₁₅ mode single-mode omnidirectional SH wave transducer are given.The performance and process of the SH₀ wave excitation of the transducer are numerically simulated by using finite element software,and the excitation performance is compared with the indicators in the literature.to evaluate.The harmonic response of the designed d₁₅ mode single-mode omnidirectional SH wave transducer is analyzed,and the influence of structural parameters on its resonance frequency and impedance characteristics is discussed,and the working power of the transducer is obtained.In the ultrasonic deicing simulation,a three-dimensional model of ice accretion-substrate is established,and steady-state analysis is performed on the shear stress of the ice accretion interface and the peeling area of the ice accretion.Completed the design of d15 mode single mode omnidirectional SH wave ultrasonic deicing transducer.A test platform was built to verify the unity of the SH wave mode excited by the d15mode transducer in the aluminum plate,and to study its frequency range and other characteristics;At the same time,the omnidirectionality of the single-mode SH wave excited by the transducer was experimentally studied.Finally,the designed transducer is used to ultrasonically de-icing the aluminum ice accumulating plate,the influence of the ice accretion thickness and other parameters on the deicing performance is discussed,and the deicing power density is given.