Simulation, Optimization And Dynamic Characteristic Analysis Of Magnetorheological Elastomeric Isolator In Mixed Mode

Magnetorheological elastomer,as a new type of intelligent vibration isolation material,has potential research value.But at present,the modeling and optimization of the hybrid MR elastomer isolator are not perfect.The purpose of this thesis is to design a hybrid MRE vibration isolator,to model,simulate and improve its structure.The physical model of the damping system is established under the Dymola software,and the mathematical model of the damping system is built in the Simulink software.The consistency between the physical model and the mathematical model is verified,and the vibration isolation performance of the isolator is further verified.The specific work is as follows:Firstly,the micromechanical model of MRE is studied,and the parameter models of compression modulus and shear modulus of MRE are calculated;the corresponding relationship between magnetic induction strength and elastic modulus is obtained through testing,and the least square method is used to match with MATLAB software,thus the concrete expression of MRE macro mechanical model is obtained,and the equivalent of the vibration isolator is deduced Stiffness expression and damping ratio.Secondly,the structure of the hybrid MR elastomer vibration isolator is designed.The magnetic circuit of the hybrid MRE isolator is designed and calculated by the formula of magnetic flux potential,and the rationality of the coil turns and structure design of the MRE isolator is checked according to the Ohm law of the magnetic circuit.The structure size of MRE vibration isolator is determined preliminarily,which paves the way for the following simulation improvement of structure and magnetic field of vibration isolator.Thirdly,the ANSYS APDL parametric language modeling and simulation system andorthogonal optimization algorithm are integrated by MATLAB,and the automatic modeling,simulation and optimization system of the hybrid MRE vibration isolator is established.Taking the total magnetic stiffness as the objective function to evaluate the vibration isolation performance of the vibration isolator,the optimal structural parameters are obtained.The results show that the magnetic induction strength of MRE can be improved by adding high magnetic core.When the thickness ratio of two extruded elastomers is 3 : 1,the height ratio of magnetic base and core is 0.5,the magnetic stiffness of hybrid MRE isolator is the largest.Finally,the transmission ratio of the vibration isolation system is used to evaluate the vibration isolation performance of MRE vibration isolator.The physical model and mathematical model of the vibration isolation system are established by Dymola and MATLAB/Simulink respectively.The results show that the physical model is consistent with the dynamic simulation results of the mathematical model.In this thesis,the extrusion modulus and shear modulus of MRE are tested,and the mechanical model is established.The number of turns of the isolator coil is determined by the magnetic flux potential,and the structural parameters of the components of the MRE isolator are preliminarily determined.The magnetic circuit of the MRE isolator is optimized by using APDL parametric language and orthogonal optimization method.The dynamic simulation software is used to verify the consistency between the physical model and the mathematical model.It provides a new idea for the mechanical model and optimization of the hybrid MRE vibration isolator.