Vibration Characteristics And Passive Control Of Magnetostrictive Cantilever

Magnetostrictive materials can realize machine-magnetic-electricity?mechanical field,electromagnetic field and circuit?two-way transducting,are important magnetron intelligent materials in the field of electrician high technology.Galfenol material as a new magnetostrictive material,combine small saturated magnetic field,high Curie temperature,low brittleness,and high tensile strength,can effectively overcome the major defects in the process of bending fracture of piezoelectric material PZT,giant magnetostrictive material Terfenol-D under high tension.Magnetostrictive materials have broad application prospects in the fields of intelligent cantilever vibration control,so the study of the vibration control methods has important theoretical and realistic significance.Firstly,in this paper,the research process of the smart cantilever vibration control is introduced,the main vibration control methods and the development situation of magnetostrictive Galfenol vibration cantilever are summarized.And then the distributed parameter model of magnetostrictive cantilever is established.The transfer functions of instantaneous power and the tip relative displacement of the cantilever under acceleration excitation are derived by the proposed model.The model is not only able to predict the trends of response curves of the power transfer rate and displacement transfer rates with different external load impedances,but analyze the vibration performance of each mode.Assuming the device is made single-mode vibration,the device is seen as a single degree of freedom mass-spring damping system,a lumped parameter model of cantilever vibration device under the first order modal is established on the basis of the distributed parameter model proposed.And the stability of passive control system with the external shunt circuit and the effects of different parameters on the displacement transmissibility curves are analyzed.Comparisons between the experimental and calculated results show that the correctness and validity of the model.The model can accurately predict the changing laws of the resonant frequency and resonant peak with series shunt impedances.And the estimated values of optimal series resistance and optimal series capacitance can be determined.Analogous to the optimization design of spring mass damper system,the parameters of magnetostrictive cantilever vibration control system with series L-R-C shunt circuit are optimized using H₂ optimization algorithm.These studies play an important role in the performance forecast,design,vibration control and use of magnetostrictive cantilever vibration device.