PERFORMANCE OF MULTIPLE TUNED MASS DAMPERS FOR TORSIONALLY COUPLED SYSTEM

Dynamic response behaviour of a simple torsionally coupled system with Multiple-Tuned Mass dampers (MTMDs) is investigated. The system is su bjected to lateral excitation that is modelled as a broad-band station ary random process. MTMDs with uniformly distributed frequencies are c onsidered for this purpose and they are arranged in a row covering the width of the system. A parametric study is conducted to investigate t he effectiveness of MTMDs on reducing the response of torsionally coup led system. The parameters include the eccentricity of the main system , its uncoupled. torsional to lateral frequency ratio and the damping of MTMDs. It is shown that the effectiveness of MTMDs in controlling t he lateral response of the torsionally coupled system decreases with t he increase in the degree of asymmetry. Further, the effectiveness of MTMDs, designed for an asymmetric system by ignoring the effect of the torsional coupling, is overestimated.