Vibration Control Method Of Intelligent Magnetostrictive Structure

Magnetostrictive material has good mechanical properties can change,can overcome the intelligent piezoelectric material aging,overheating failure,brittleness,low tensile strength,the device structure,provides a new method for vibration control device,this paper made the following research on the vibration control method:Firstly,the active damping control of the intelligent magnetostrictive cantilever beam.According to the characteristics of magnetostrictive material and the Euler Bernoulli beam dynamics theory,the driving model of magnetostrictive cantilever is established,and the corresponding state space equation is established,and the controller is designed by using linear two times optimal control algorithm.The simulation results show that the initial condition of the beam,the position and length of the magnetostrictive plate will affect the effect of the main vibration control system,and the closer the magnetostrictive piece is to the fixed end of the cantilever beam,the longer the length is,the better the active vibration reduction effect is.Secondly,passive vibration damping control of an intelligent magnetostrictive cantilever beam with shunt circuit.Based on Hamiltonian energy theory,the electromechanical bidirectional coupling model of cantilever beam vibration system is established,and the frequency expression of induced current,free end displacement and displacement transmissibility is derived.The displacement frequency characteristics of the device in different resistance and different capacitance calculation,the calculation results agree well with the experimental results indicate that the model can reflect the influence of the external circuit impedance of the device displacement amplitude and resonant frequency of the shunt resistance also shows that the passive damping method has better damping performance only in device resonance frequency at.Finally,the band gap and vibration damping performance of the magnetostrictive phononic rod with a shunt circuit.The magnetostrictive materials and shunt circuit damping technology is introduced into the intelligent structure of phononic crystal periodic arrangement,deduced shunt circuit of magnetostrictive equivalent Young's modulus,and the rod longitudinal vibration model and the transfer matrix theory,obtained the device band attenuation coefficient and displacement transmission.The calculation summarizes the shunt circuit components(load resistance,load capacitance,load impedance)and the influence of the number of periodic phononic crystal band gap and damping properties,show that the damping technology through external shunt damping circuit to realize different magnetostrictive elastic modulus change,so as to regulate the phononic band gap size the scope of vibration control can achieve a wide range of frequencies.In this paper,a variety of vibration control methods for intelligent magnetostrictive structures are designed,analyzed theoretically and simulated,and the damping performances of various control methods are compared.These studies have laid a theoretical foundation for the practical application of the intelligent magnetostrictive vibration damping technology and played an important guiding role.