Numerical analysis of elastomer buffer embedded in the suspension of automobile for vibration damping improvement

Abstract

Elastomers, due to their excellent damping and energy absorption characteristics and low cost are used extensively in automobile industry to isolate the structures from vibration and shock loads. In this study, it was aimed to analyze the damping performance of an elastomer buffer embedded in the suspension of an automobile. To reach to this aim, vibration simulation of an automobile suspension model was conducted by using a nonlinear explicit finite element code, Abaqus. In order to simulate the damping behavior of elastomer buffer, the hyperelastic and linear viscoelastic material models were used together. The numerical model was validated with results of exact solution method in terms of transmissibility ratio and phase shift in a wide range of input excitation frequencies. Good agreement was observed between the exact solution and finite element results, which indicated that finite element model was sufficiently accurate. To examine the damping performance of the buffer, the displacement time history curves were extracted for suspension with and without buffer under the sinusoidal base excitations. The vibrating motions of suspension for both conditions were compared. The comparison results prove that the elastomer buffer is effective in improvement of damping performance of suspension. It reduces the amplitude of vibration and oscillation time of sprung mass remarkable in excitation frequencies around and over the natural frequency of the system.

Reliability analysis based on load spectrum: A structural improvement of Indian Railways three-piece freight bogie elastomeric pad

“…The performance of elastomeric buffer embedded on the coil spring of an automobile suspension system was examined by Meran. 11 Krishnamoorthy et al 12 developed four separate models of the same load, sleeper, and rail but with different rubber pad thicknesses using the FE software ABAQUS to investigate the effect of the variation of rubber pad thickness in terms of the static stress distribution of the rail-sleeper. Spring supports are used at the bottom of the sleeper to represent the elastic stiffness of the ballast bed and subgrade.…”