A DDA enhanced locally resonant metamaterial: experimental testing on a Lego® Technic assembly
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Author / Producer
Date
2023-06
Publication Type
Conference Paper
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yes
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Abstract
Locally resonant metamaterials (LRMs), with periodic elements that exhibit local resonance, have been recently investigated by numerous researchers as a means to pursue vibration attenuation and wave manipulation. These structures are able to generate bandgaps in specific frequency ranges depending on their mass, stiffness and geometrical characteristics; however, they present certain limitations when bandgaps in the low-frequency domain are sought, since they require heavy oscillating masses. This research work harnesses the potency of a novel dynamic directional amplifier, namely the DDA, that is introduced as a means to artificially increase the inertia of an oscillating mass. The DDA is realized by imposing kinematic constraints to the degrees of freedom (DoFs) of the oscillator, hence inertia is increased by coupling the horizontal and vertical motion and forcing the model to move along a circumference. Herein, the DDA is applied on the resonating mass of a scaled LRM structure, assembled using LEGO® components. Experimental and analytical calculations are subsequently undertaken to investigate the dynamic properties of this DDA-enhanced metamaterial. Results showcase the low-frequency attenuation properties of the structure and serve as a proof of concept of the mechanism.
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Publication status
published
Editor
Book title
XII International Conference on Structural Dynamics
Journal / series
Volume
2647 (17)
Pages / Article No.
172001
Publisher
IOP Publishing
Event
12th International Conference on Structural Dynamics (EURODYN 2023)
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Date created
Subject
Organisational unit
03890 - Chatzi, Eleni / Chatzi, Eleni
Notes
Conference lecture held on July 5, 2023.
The "accepted version" was published with the licence "in copyright".
Funding
813424 - INNOVATIVE GROUND INTERFACE CONCEPTS FOR STRUCTURE PROTECTION (EC)