Experimental study of phononic structures with DDA enhanced unit-cells
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Date
2023-10
Publication Type
Conference Paper
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yes
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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.
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Publication status
published
External links
Book title
COMPDYN 2023: 9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering. Proceedings Volume I
Journal / series
Volume
Pages / Article No.
994 - 1004
Publisher
Institute of Structural Analysis and Antiseismic Research School of Civil Engineering, National Technical University of Athens (NTUA)
Event
9th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN 2023)
Edition / version
Methods
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Date collected
Date created
Subject
Phononic structures; Metamaterials; Amplification mechanism; Experiment; Vibration control
Organisational unit
03890 - Chatzi, Eleni / Chatzi, Eleni
Notes
Funding
813424 - INNOVATIVE GROUND INTERFACE CONCEPTS FOR STRUCTURE PROTECTION (EC)