Abstract
Phononic structures with periodic unit-cells that exhibit Bragg scattering, have been investigated during the latest years by various researchers due to their extraordinary wave manipulation and filtering properties. One major feature of these metamaterials is their ability to generate stopbands or bandgaps in the frequency domain, hence presenting significant vibration attenuation properties. However, this mechanism presents certain design constraints in generating broadband bandgaps, especially in the low-frequency range, where large masses are required. To this end, a novel dynamic directional amplifier, namely the DDA, 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. In this study, the DDA is implemented in an experimental scaled phononic set-up that is constructed using LEGO® Technic components. Experimental testing is undertaken as a feasibility assessment of the concept and results indicate the low-frequency wave attenuation properties of the structure. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000644470Publication status
publishedExternal links
Book title
COMPDYN 2023: 9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Proceedings Volume IJournal / series
COMPDYN ProceedingsPages / Article No.
Publisher
Institute of Structural Analysis and Antiseismic Research School of Civil Engineering, National Technical University of Athens (NTUA)Event
Subject
Phononic structures; Metamaterials; Amplification mechanism; Experiment; Vibration controlOrganisational unit
03890 - Chatzi, Eleni / Chatzi, Eleni
Funding
813424 - INNOVATIVE GROUND INTERFACE CONCEPTS FOR STRUCTURE PROTECTION (EC)
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