Vibration Absorption Performance of Metamaterial Lattices Consisting of Impact Dampers

Chondrogiannis, Kyriakos Alexandros; Dertimanis, Vasilis K.; Masri, Sami F.; Chatzi, Eleni

doi:10.47964/1120.9338.19599

Cited by 2 publications

(1 citation statement)

References 21 publications

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“…The study considered variable parameters, such as the number of unit cells, stiffness, and mass ratio. Their findings demonstrated that the proposed method significantly impacts the base meta structure, leading to effective vibration mitigation9 . Lv et al (2024) proposed a metamaterial based on Coulomb friction is self-recoverable and reusable.…”

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A parametric study on the energy dissipation capability of frictional mechanical metamaterials engineered for vibration isolation

Khosravi,

Amjadian

2024

Active and Passive Smart Structures and Integrated Systems XVIII

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Mechanical metamaterials are engineered structures with complex geometric arrangements that display unconventional mechanical properties which are uncommon in traditional materials. They possess the ability to manipulate and control mechanical wave propagation across specific frequency ranges known as frequency bandgaps. This feature makes them extremely useful for a variety of applications in structural control including passive vibration isolation. These materials can be engineered to selectively block or redirect the input motion at their dominant frequency while allowing the transmission of motion at other frequencies. This paper aims to study the dynamic performance of an innovative mechanical metamaterial designed for seismic isolation in multi-story buildings. This seismic isolator, which is termed the meta-isolator (MI), utilizes solid friction to enhance energy dissipation in addition to its natural viscous damping. The proposed MI comprises multiple interconnected cells linked in series via a network of springs and dampers, where each cell includes a lumped mass, spring, damper, and sliding surface, providing both vibration isolation and energy dissipation functionalities. A dynamic model is developed to characterize the nonlinear hysteresis behavior of the proposed MI. This model is implemented on a one-story building model to assess its seismic performance under specific ground motion. A parametric analysis is conducted to optimize the key parameters of both the MI and the building model aiming to reduce drift and absolute acceleration responses. These parameters include mass and frequency ratios, the magnitude of normal force acting on the sliding surface within each cell, and the number of cells. Finally, the optimized dynamic model of the MI is utilized to evaluate its efficacy in seismic isolation of a finite element (FE) model of a one-story 2D frame building subjected to the same ground motion. The FE model is developed using the OpenSEESPy package which is a Python 3 interpreter for OpenSEES. Insights from this study indicate significant promise for the performance of the proposed MI offering hope for its use as a potent passive control system for seismic isolation. In particular, we have shown that lightweight MIs with low frequency ratios (less than 0.5) can outperform the conventional seismic isolators.

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A parametric study on the energy dissipation capability of frictional mechanical metamaterials engineered for vibration isolation

Khosravi,

Amjadian

2024

Active and Passive Smart Structures and Integrated Systems XVIII

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Application of Geometrically Nonlinear Metamaterial Device forStructural Vibration Mitigation

Chondrogiannis

Dertimanis

Chatzi

2022

Conference Proceedings of the Society for Experimental Mechanics Series

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One of major challenges encountered by civil structures throughout their life cycle pertains to exposure to dynamic loadings; with earthquakes representing an extreme case of such a load. The frequency content of a dynamic excitation is of primary importance not only because of the potential resonance it induces, but also due to limitations that arise for the capabilities of vibration mitigation devices. A recently emerging technology for civil structure applications includes the development of metamaterial configurations. These are structures, which are formed by periodic arrangement of a fundamental component design, termed the unit-cell. They can offer impressive filtering properties within specific frequency ranges; the so-called bandgaps. Considering the low frequency content of earthquake excitation, a design that features a band-gap in the lower frequency range is required. In this study, the potential of a geometrically nonlinear design for vibration mitigation purposes is investigated for lowering of the corresponding band-gap. The system consists in the periodic arrangement of nonlinear unit cells, each including a triangular arch configuration, which under large displacement considerations can produce not only geometrically nonlinear behavior, but also negative stiffness effects. Analytical derivations result to the determination of the amplitude depended band-gap of the system. The proposed configuration is attached to a target structure subjected to protection. An assessment on the capabilities of the device towards this direction was performed via numerical analyses, revealing considerable effectiveness. Acceleration response, as well as energy related measures are considered in the evaluation of the system's performance. An additional potential, which the proposed configuration can offer, refers to the applicability of the system for retrofitting purposes of existing structures. It is concluded that the system can offer significant vibration mitigation capabilities, while further study and development of the design, taking into consideration constructability limitations, can lead to an efficient passive vibration absorption device.

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Vibration Absorption Performance of Metamaterial Lattices Consisting of Impact Dampers

Cited by 2 publications

References 21 publications

A parametric study on the energy dissipation capability of frictional mechanical metamaterials engineered for vibration isolation

A parametric study on the energy dissipation capability of frictional mechanical metamaterials engineered for vibration isolation

Application of Geometrically Nonlinear Metamaterial Device forStructural Vibration Mitigation

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