Damping Loss Factor for Damping Materials for Continuous Structures

Abstract

The half power bandwidth method is used for measuring a damping loss factor. There are different damping materials available of different configuration in the market. This paper will help to select damping materials for different applications and to give a data bank for numerical analysis. Other objectives are to observe damping loss factor at various condition which are as follows: (1) To compare the effect of fusing with base material. (2) To compare the effect of material thickness. (3) To compare damping materials with constraint layer damping (4) To evaluate the damping loss factor using double layers of constraint layer damping. INTORDUCTION The damping loss factor is a very important parameter in vibration engineering and it is very difficult to evaluate analytically. The damping loss factor is a measure of energy dissipation and it must be evaluated experimentally. There are three types of damping namely, dry or coulomb, viscous damping, and structural or hysteresis damping. Dry damping is constant in magnitude and opposes the motion. Viscous damping is proportional to velocity of th