Optimal Design And Test Software Development Of New Magnetostrictive Actuator

Giant magnetostrictive actuator has been widely used in space optical loading,precision engineering and other fields due to its advantages of infinite motion,rapid domain response and large stroke and mass driving ability.However,magnetostrictive materials have some problems,such as nonlinear hysteresis,thermal expansion and so on,which limit its efficient performance.Therefore,in order to improve the static and dynamic response performance of the magnetostrictive actuator,this paper widely absorbs the design method,magnetostrictive theory and the development method of test software and hardware of the existing giant magnetostrictive actuator(GMA),and proposes a new structure design of the magnetostrictive actuator and develops the test software for the hysteresis characteristics finally.In order to shift the mass outward and provide a uniform bias magnetic field with suitable field strength,the outer radius and thickness of the bias magnetic ring were optimized based on the equivalent Biotsavart model.In order to decline the loss of the excitation coil,the coil is optimized to lessening its inductance and resistance loss level,and the basic size of the harness is determined with the best shape factor.Then,for eliminating the hysteresis loss and heat of the magnetic circuit effectively,the internal and external magnetic circuit structures are improved and optimized by theoretical analysis and electromagnetic simulation.In order to further test and analyze the developed prototype,GMA test software is written based on Qt5 environment and laser displacement sensor hardware interface,and The basic functions of data acquisition,filtering and frequency analysis are realized.What's more,With the help of the code integration tool of Simulink,a data analysis program is established and implemented to reversely calculate the magnetization parameters of GMA prototype from the actual measured displacement data,according to the magnetic domain theory and actuation model.The GMA-MRC/ 40 prototype was made according to the optimized parameters,and the experimental platform of prototype test was built.The maximum stroke,static thermal expansion,and temperature rise performance of the two types of wire harness were tested in DC response.With using AC current,the vibration isolation and frequency modulation range of the prototype,the actuation stroke and control sensitivity of the parallel coil,the response stability and anti-interference performance of the system with different stiffness at resonance frequency and limit frequency are all analyzed.Furthermore,In order to clarify the actuation performance of GMA prototype,the resolution is analyzed by using impulse response interval and start-up sound,and the loading performance is tested with different weight.At the end,the magnetostrictive hysteresis loops with increasing current are obtained for different frequencies,and the magnetization parameters of different currents at 5Hz are analyzed.And the analysis of the parameters obtained can be vital basis for GMA closed-loop control.Finally,The analysis and experimental results show that the optimized GMA performs well in the aspects of wide frequency stroke retention,excitation coil working time,resolution and hysteresis loss.These works will lay a foundation for the realization of high efficiency GMA precise control in the future.