Research Design,Modeling And Simulation Of Giant Magnetostrictive Vibrator

After processes such as forging,cutting and quenching of metal artifacts,there will be residual stress left inside the artifacts,which will greatly reduce the dimensional accuracy and fatigue strength of the artifacts and even cause accidents in the use of the artifacts.The method of vibratory stress relief,as a new aging process for removing the residual stress of metal,has the advantages of high efficiency,energy saving and environmental protection,and currently,it has been widely applied in industrial production and has a tendency of replacing the traditional thermal aging method and natural aging method.Therefore,it is of great theoretical and practical significance to design a new type of vibratory stress relief device.In this paper,with the vibratory stress relief technology as the background,a vibrator with broader vibration range,faster response and greater output force is designed by using giant magnetostrictive material,aiming at the common defects of the traditional electric vibrator,and the theoretical and simulation research is conducted on the key technical problems.In this thesis,the operational mechanism and basic characteristics of the giant magnetostrictive material is profoundly studied,and the problems that should be paid attention to in the designing of vibrator are put forward on considering the actual operational condition.On the basis of the research on the characteristics of the giant magnetostrictive material,important components are designed and optimized by combining with the requirements of aging artifacts on the output characteristics of the vibration source in vibratory stress relief,such as the whole structure of the vibrator,the geometric dimension of the giant magnetostrictive rod and the geometric parameters of the pretightening force mechanism,temperature control device,drive and biasing coil.The operational characteristics of the giant magnetostrictive vibrator directly depend on the characteristics of the magnetic field in the magnetic circuit structure within the vibrator.In order to improve its operational performance,the finite element analysis software,Comsol Multiphysics5.2 is used in this paper to establish the finite element model of the vibrator;the internal magnetic field distribution of fully opening,half opening and fully closing of the magnetic circuit within the vibrator are respectively simulated and analyzed,and finally the design scheme of the structure of closed magnetic circuit is determined.Then,the influence of the magnetizer and the magnetic wall used in organizing the closed magnetic circuit on the uniformity of the magnetic field distribution in the magnetic circuit structure when using materials with different magnetic permeability is simulated and analyzed,so as to determine the method of selecting the materials of all the components in the closed magnetic circuit.In order to make quantitative study on the dynamic characteristics of the giant magnetostrictive vibrator,the dynamic model of the vibrator is established,andMatlab/Simulink is used in the simulation analysis on the influence of the main structural parameters on the dynamic characteristics of the vibrator,which provides theoretical basis for the dynamic design and optimization of vibrator.In addition,the state feedback controller of the vibrator is designed based on the pole placement method,and the simulation of this controlling method is conducted from two aspects,precise positioning and anti-interference ability.The results show that the controller can well control the vibrator.