Design And Self-sensing Of Giant Magnetostrictive Microdisplacement Actuator In Structural Vibration Control

Giant magnetostrictive actuator (GMA) is the use of giant magnetostrictive materials (GMM) as actuator components of the new devices, it has a large output displacement, high power output, fast response, wide temperature range, low operational and other advantages,it has shown a good application prospects in the ultra-precision machining, precision positioning devices, reducing vibration and noise and other areas. Self-sensing actuator have very good prospects in fault identification, diagnosis, voice study, micro-applications. However, because of the strong hysteresis of the giant magnetostrictive material and the driving magnetic structure, the output displacement of an actuator possesses strong hysteresis, poor repeatability, and severe nonlinearity, which restrict the positioning precision of an actuator and hamper its wider applications in many fields. At present very few people on the self-sensing magnetostrictive actuator research.This dissertation emphasizes on axial moving type GMA , The design principle of the GMA and the methods systematically elaborated, and researched the GMA's hysteresis Modeling and hysteresis compensationand , did the precision positioning experiment, Observer-based method of self-sensing GMA had been studied, Carry out the corresponding experiment .The main research work of this paper is listed as follows:1) Introduced the giant magnetostrictive actuator design principles and methods ,established to consider the magnetic field intensity and electric - magnetic coil conversion rate optimization of the geometric form factor design criteria, analysis of the plate spring or disc spring used as a pressure device and the application of Features a pre-established pressure analysis. Analysis of convection in three different cases, different parts of the current temperature of the corresponding GMA;2) Modify the classical Preisach model, the establishment of giant magnetostrictive actuator compensation nonlinear, did the precision positioning experiment,3) Introduced the method based on observer self-sensing GMA, Carry out the linear observer of self-sensing GMA and preisach Model of Hysteresis compensation of self-sensing GMA experiment Study ,compared the experimental results ,Preisach hysteresis compensation observer based on self-sensing of the GMA's perception is better than the linear observer based on self-sensing. Finally, the main conclusions of this article.