Mechanical Property And Model Study Of Magnetostrictive Actuator

Magnetostrictive material is a new functional material, it relate to the aerospace,defense and military industry, machinery, textiles, electronics, petroleum, agricultureand other fields. Currently the magnetostrictive material is used only for the controlof small institutions, but the research which it can be made the drive componentwhich is suitable for the large displacement and large driving force of the large civilengineering structure is very important. Especially the magnetostrictive drivingdevice is applied to the cable vibration aspect of the cable-stayed bridge, this havenot seen relevant reports at home and abroad.In the paper, by using the magnetostrictive rod owns the advantage of large loadoutput, large strain, rapider response, it can be used to make a new type of actuatorwhich apply to active control of the cable, This is in order to develop a new cablevibration technology to provide support. The main research work of the thesis ispresented as follows:(1) The development background of smart material and engineering structurevibration control are introduced, the history of magnetostrictive actuatorresearch and application in China and oversea are comprehensivelypresented, the project significance and main contents of the research areprovided.(2) The basic properties of magnetostrictive material are introduced, theory andmethods for designing the magnetostrictive actuator are presented,including frame design of the actuator, GMM rod design, the geometricparameter design and optimization of the coil, magnetic circuit design,pre-stress design, etc.(3) Finite element model of the magnetostrictive actuator is build up, themagnetic circuit opening or closing state to magnetic field effect of GMMrod is analyzed, the relative permeability of material used by the magneticcircuit to magnetic field effect of GMM rod is also analyzed, by experimentmeasured axial magnetic field strength and uniformity of GMM rod.(4) Dynamic model of the magnetostrictive actuator is build up,electromagnetic-mechanical coupling equation of the actuator is derived,simulation analysis for the actuator is carried out, indicators of mechanical property of the actuator is grasped in theory.(5) Comprehensive experimental system of the magnetostrictive actuator isbuild up, the influences of pre-stress, excitation voltage, bias current,excitation voltage frequency to the actuator output performance is studied;the neural network model of magnetostrictive actuator is build up.(6) Main research work and some innovative points in the dissertation aresummarized, and further research work is put forward.