Structural Design And Performance Research Of Hybrid Magnetorheological Elastomer Vibration Isolator

As a new branch of magneto-rheological(MR)materials,MR elastomer(MRE)has magnetostrictive and shear deformation effects,which can effectively change the stiffness and damping of structures,making them suitable for vibration control technology under various complex loads,thus improving the safety and reliability of machinery and equipment.In recent years,the vibration isolator based on MRE has the advantages of continuous,reversible,instantaneous and so on,which are highly promising for applications in aerospace,civil construction engineering,logistics and transportation fields.Therefore,this paper proposed and designed a hybrid(shear and compression combined working mode)MRE vibration isolator by combining the working mode of MRE,which can have a larger working area with a certain volume,in order to achieve the purpose of improving the vibration isolation performance.On this basis,the software Maxwell and OpenModelica were combined to conduct modeling and simulation analysis,meanwhile,a vibration isolation platform was built to test its vibration isolation performance.The simulation and test results verified the rationality and feasibility of the structure,which has certain reference value for the design,development and performance testing of the hybrid MRE vibration isolator.The main research contents of this paper are as follows:1.The anisotropic MREs with different proportions are prepared,and their magnetic properties are analyzed and tested theoretically.The corresponding relationship between the magneto-shear modulus and the magneto-compression modulus with the magnetic induction intensity of the sample B of MRE is established.Meanwhile,the variation law of the magneto-shear stiffness,the magneto-compression stiffness and the total magneto-stiffness with the magnetic induction intensity is also deduced.2.A hybrid MRE vibration isolator is designed,which has a larger working area by combining the MRE working modes with a certain volume of the vibration isolator.Based on the MR effect of MRE and the operating principle of the vibration isolator,the material selection and size parameters of each components are determined through magnetic circuit calculation and structural design.Meanwhile,the important dimensions are checked and verified,and the parameters of the vibration isolator are preliminarily obtained.3.The software Maxwell and OpenModelica are used to model,simulate and analyze the static magnetic field characteristics and dynamic performance of the vibration isolator.The direction of magnetic force lines,magnetic flux leakage and the average magnetic induction intensity distribution of MRE are analyzed.Meanwhile,the variation law of vibration response of the system with the applied current and excitation frequency is investigated.4.The vibration isolation test system is built,and the vibration isolation performance test is conducted on the hybrid MRE vibration isolator prototype.Meanwhile,The effective conclusions are drawn by comparing and analyzing the simulation results: when the external excitation is within the frequency range of 16 Hz,the semi-active vibration isolation can be carried out by applying current;When the external excitation is at high frequency,the vibration isolator does not need to be energized for passive vibration isolation.