Dynamic Response Assessment of Impact Meta-Dampers
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2022-07
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Other Conference Item
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Abstract
Recently, the concept of metamaterials, initially studied for electromagnetic applications has gained interest within a civil engineering context. It has been shown that periodic arrangement of resonators, referred to as unit cells, can provide beneficial properties in vibration absorption, within a specific range of frequencies, the so-called bandgap. In order to take advantage of the full potential these unique structures can offer, a wider breadth of the bandgap is pursued, while additionally shifting the lower bound to lower frequencies renders metamaterials appealing for civil engineering applications. One promising solution to this requirement is the use of nonlinear resonators, which form part of the metamaterial configuration. In the current work, periodic structures consisting of impact damper resonators are investigated, thus introducing a highly nonlinear behaviour. The performance of a single impact damper has already been investigated and its dynamic response has been proven to be advantageous for vibration attenuation. Further exploiting this phenomenon, the current study is extended to multiple degree of freedom (MDOF) systems, which are investigated both numerically and analytically. The MDOF systems occur as concatenation of a finite number of impact damper unit cells. Several characteristics of the proposed configuration are explored as variable parameters for optimization purposes. For the assessment of the system’s efficiency, different metrics are being studied, including the frequency response function and the total energy loss as a result of the metastructure contribution. The results confirm the potential of utilization of the metamaterial concept, building on impact phenomena, for vibration attenuation.
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University of Lyon
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10th European Nonlinear Dynamics Conference (ENOC 2022)
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03890 - Chatzi, Eleni / Chatzi, Eleni
Notes
Due to COVID-19 pandemia, the conference 2020 was postponed to 2022. Conference lecture held on July 19, 2022