Impact Damper with Granular Materials : 2nd Report, Both Sides Impacts in a Vertical Oscillating System

Abstract

A new type impact damper consists of a bed of granular materials moving in a container fixed to the primary vibrating system. The problem is to determine the characteristics of the damper with granular materials, for reducing the vibration of a single degree-of-freedom system when the driving force is simple harmonic. This report treats the case when the bed in the container impacts on both end walls in a vertical oscillation of the system. Experimental models were tested in the laboratory and analyses were made to find steady state periodic solutions of the system. Results of analyses agreed favorably with those of experimental tests.