Vibration And Shock Resistance Mechanics Performance Of Metal-net Rubber Damper

Metal-net rubber is a new dry friction damping material, compared with the traditional metal rubber material, the manufacturing process of metal-net rubber is greatly improved,which has high mechanization degree, and the mechanical performance of metal-net rubber is more stable, in this paper, the research of static and dynamic mechanical properties of metal-net rubber are as follows:1. Through static compression experiment, the influence of several important factors such as compression amount, relative density, wire material and heat treatment on bearing capacity and energy dissipation performance was studied, the variation law of nonlinear stiffness, energy dissipation of unit volume and energy dissipation coefficient were obtained;Compression experiment of metal-net rubber was carried out under different loading velocities, and the influence of loading velocity on the nonlinear stiffness was analyzed.2. Sine sweep experiment and random vibration experiment for metal-net rubber damper were carried out, the influence of several important factors such as vibration level, preloading,load mass, relative density, wire material and heat treatment on the transfer rate, natural frequency, root-mean-square response acceleration and vibration reduction efficiency was studied by using control variable method, several relevant change curves were derived, and the dry friction damping mechanism of metal-net rubber was analyzed.3. A finite element simulation method of random vibration for metal-net rubber damper was put forward, use the orthotropic elastic damping material to simulate metal-net rubber and the related simulation parameters are determined through the sine sweep experiment of metal-net rubber damper, the finite element simulation of metal-net rubber damper random vibration was done via ANSYS Workbench, the simulation results was compared with the experimental ones, results show that the proposed finite element simulation method can well simulate metal-net rubber damper random vibration and the calculation results with high accuracy.4. Based on the theoretical study of energy consumption, buffer mechanism of metal-net rubber under shock load and the theory of linear shock response, combined with the nonlinear mechanical characteristics of metal-net rubber, a formula for the description of shock response acceleration of metal-net rubber isolation system under shock load was derived.Shock experiment was performed to study the effect of shock load, relative density and load mass on the shock protection characteristics of metal-net rubber isolator, the theoretical calculation results was compared with the experimental ones, and the range for the practical use was determined.5. Based on the shock experiment,A finite element simulation method of shock for metal-net rubber damper was put forward, use the COMBI 165 Spring and damping element to simulate metal-net rubber and the related simulation parameters are determined through the compression experiment of metal-net rubber. the finite element simulation of metal-net rubber damper shock was done via ANSYS LS-DYNA, the simulation results was compared with the experimental ones, the feasibility of shock simulation method was verified; and at the same input shock velocity, shock response of metal-net rubber damper under different shock waves load and different pulse time of rectangular wave were studied by simulation.