Fundamental Therory And Simulation Study Of Positive & Inverse Effects And Self-Sensing For Giant Magnetostrictive Transducer

Giant magnetostrictive material (GMM) has a lot of outstanding performances, which make it have a broad prospect well in sonar, detection, magnetical, mechanical and eleetrical transducer fields. The research on the positive& inverse effect and self-sensing theory will push forwad and accelerate the giant magnetostrictive material in smart device application.Firstly, the performances of giant magnetostrictive material and applications of the giant magnetostrictive transducer are explained in detail in the paper, the concept of self-sensing actuator is summarized briefly; the main jobs are gived in paper.Secondly, the magnetostriction mechanismbasic and the basic features of GMM are expounded in detail, three kinds of forms of magnetostrietive fundamental phenomenons and piezomagnetic equations on account of self-sensing fundamentalare introduced, the meanings of two equations are talked about under constant temperature and change temperature.The paper established a positive effect model of magnetostrictive transducer based on the JA model and combined with secondary domain model and dynamic model. According to the model the simulation program is compiled, a research on the simulation for the relationship of additional magnetic field and magnetic field intensity, displacement and magnetostrictive is made. The simulation result show that both displacement and strain would occur times frequency phenomenon when bias current less than the excited current. The times frequency phenomenon will weaken and disappear with increasing bias current.An inverse effect model of magnetostrictive transducer based on the magnetic machine coupling model is established. And compile the simulation program according to the inverse effect model.The paper make a research on the simulation for the relationship of the applied stress and magnetizing strength, and the relationship of the applied stress and inductive voltage. The simulation result show that the bigger the prestress and the smaller the output voltage peak–peak. It verifies the accuracy of the model by contrasting the simulation results and experimental results.The paper discuss the theory of self-sensing detection of electric bridge circuit, and compile the program of dynamic equation of transducer. It present the model I of self-sensing detection of electric bridge circuit by combining the circuit with dynamics model. According to the model I of self-sensing detection of electric bridge circuit, JA model into the model II of self-sensing detection of electric bridge circuit is introduced. The simulation result shows that the model II can accurately describe the hysteresis nonlinear of the material themselves. Basis on it we can build a bridge circuit in practice and extract self-sensing signal. It derives the formulation of self-perception force and displacement. with piezomagnetic equation and Faraday's law, and convert the self-sensing voltage signal into a self-sensing force and speed signal, therefore, derive the mode III of electric bridge circuit by improving the mode II of electric bridge circuit.