Vibration reduction using meta-structures composed of tuned dynamic absorbers employing mass impacts

Abstract

The vibration damping capability of a meta-structure composed of tuned dynamic absorbers employing mass impacts was investigated. The tuned dynamic absorbers consisted of a spring and a mass. The mass induced impacts within the vibrating system. To reduce the structural vibration, metamaterials attached with the multiple tuned dynamic absorbers employing impacts were proposed. The wave propagation characteristics of the meta-structure were predicted and compared with those obtained by measurements. The reflected wave from the meta-structure was completely blocked at the resonance frequency. The impact between the beam and the tuned dynamic absorbers dissipates the vibration energy. To verify the damping of one tuned dynamic absorber employing impacts, the effective damping ratio was calculated for a vibrating system with a single degree of freedom. Due to vibration reduction during impacts between the system and the absorber, the structural damping ratio was increased significantly without the use of viscoelastic materials. The proposed structure provides an efficient methodology without the use of viscous vibration damping materials in the broadband frequency range, which is essential for applications to at high or low temperatures. (C) 2017 Elsevier Ltd. All rights reserved.