Abstract
At present, to decrease a vibration of engineering structures three main types of damping treatments are used: (i) layer of hard viscoelastic plastic with sublayer of hard light plastic; (ii) layer of soft viscoelastic plastic or rubber, constrained by thin hard layer; and (iii) layer of thickness viscoelastic material. All these treatments ensure effective vibration damping at a limited frequency range. Structures of combined damping treatments uniting properties of some of the above-mentioned ones are proposed. Damping effectiveness of proposed treatments is essential at more wide frequency range. Formulas to estimate the loss factor of combined treat- ment are given. Measured loss factor of one of the proposed treatments is shown. Data of an experiment and an estimation are close to each other.
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