Simulation And Experimental Study On Impact Resistance Of Metal Rubber Vibration Isolator

Metal rubber material has obvious advantages in physical and mechanical properties.It can be used as vibration isolator damping element in special environment to effectively solve the problem of high speed and heavy load impact in aerospace field.However,due to the nonlinear characteristics of metal rubber materials,it is difficult to design impact isolator.The design method of combining experience with test costs a lot of manpower and material resources.In addition,in the case of complex impact conditions,the test cannot be carried out due to the great difficulty,which limits the development of metal rubber technology in impact resistance application.In this paper,the impact resistance of metal rubber isolator is studied by means of simulation and test.Based on the nonlinear mechanical characteristics of metal rubber materials,the influences of the relative density of metal rubber and the wire diameter of metal on the quasi-static stiffness characteristics of vibration isolator during deformation were studied.The mechanical response model of impact process was established and the mechanical response rules of vibration isolator under different impact parameters were studied.The effects of relative density and wire diameter on impact mechanical response of vibration isolator were studied by changing metal rubber parameters.By means of energy dissipation coefficient,the damping characteristics of vibration isolator during shock resistance were analyzed,and the influences of wire diameter and relative density of metal rubber on the damping characteristics of vibration isolator were studied.The impulse response function method was used to analyze the impact response characteristics of isolator,and the acceleration response formula under the impact of half sine is deduced.The metal rubber vibration isolation system under impact acceleration response characteristics were studied,respectively,the research of metal rubber parameters and impact parameters on the metal rubber vibration isolator influence law of shock resistance,shock isolation coefficient was used to study the impact resistance vibration isolator change,for the metal rubber vibration isolator design to provide theoretical basis and reference.Based on ABAQUS software module custom material attribute,established the finite element model of metal rubber shock system,analyzes th e different parameters and impact parameters on the metal rubber vibration isolator shock resistance and the effect of the finite element simulation and the result was compared with the test results,verify the feasibility of the simulation calculation method and calculation results of reliability.On this basis,the error analysis and local optimization of the simulation were carried out,and the reliable simulation method was obtained,which provides the theoretical basis for the design of metal rubber isolator under the impact of high speed and heavy load.According to the technical requirements of a certain project,the design of metal rubber isolator under high speed and heavy load impact was carried out,the finite element simulation calculation of different parameters of metal rubber isolator was carried out,and the optimal parameters of metal rubber isolator were selected according to the simulation results.According to the stress distribution during impact,the structure of the isolator was optimized,and the final design scheme was given by comparing the stress distribution cloud chart before and after optimization.