Rayleigh 비례감쇠를 활용한 요철이 있는 감쇠층의진동저감 해석

Abstract

This paper describes the evaluation of the dynamic behaviors of an isolated neoprene layer in the shape of arectangular bumper inserted between two aluminum blocks. An experimental verification methodology is appliedto obtain the damping ratios of rubber as a cushioning material and the isolation layer system. For theexperiment, a finite element model with two degrees of freedom is established to compare the vibrationalreduction characteristics. Dynamic responses are observed from the results of the finite element method byapplying the general viscous damping ratio and Rayleigh proportional damping ratio. The results from the twoindividual damping ratios are similar to each other in terms of the frequency response function. Additionally, thenatural frequencies and damping ratios decrease significantly as the portion of voids increases in the rectangularisolation layer. The procedure proposed herein allows one to predict the vibration-reduction behavior for variousbump patterns of any damping material.