The Structural Engineer > Archive > Volume 57 (1979) > Issues > Issue 3 > A Passive Damping Device for Structures in Low-frequency Oscillation
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A Passive Damping Device for Structures in Low-frequency Oscillation

Oscillation of a structure induced by vortex excitation is likely to occur at frequencies quite different from the natural frequency of the structure because of the locking-in phenomenon. Effective damping by means of a passive mechanical system requires that the system be capable of operating over a large range of forcing frequencies under the exciting forces which may vary in direction and intensity. A damping device based on the principle of energy dissipation by impact has been developed for this purpose. It has a nonlinear response to displacements, and is suitable for operation at relatively low frequencies. Selected experimental results are presented in this paper. H.Y. Wong