Abstract
For many years a high-powered damping material has been requested for use in various industrial products. Viscoelastic, composite or sandwich materials have been developed and used only to be revealed as insufficient below 200 Hz. This paper introduces a lightweight, low-priced, and high-powered viscoelastic damping layer, in which varisized masses are distributed to compose dynamic dampers. The dynamic spring constant of the damper depends on d/h : d is the diameter of the mass and h is the height of the layer underneath the mass. The experiment manifests remarkable effects of the damping layer : only four or six masses are enough for the layer of 0.5 m×0.5 m size, the masses have exclusive effects for their respective natural frequencies, and the masses distributed regularly can be sufficient. The analysis of the FEM model with damping masses proves approximately the same effect as the experiment.
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