Investigation of 2D Rainbow Metamaterials for Broadband Vibration Attenuation
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Institute for Aerospace Technology & The Composites Group, University of Nottingham, Nottingham NG8 1BB, UK
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Department of Mechanical and Construction Engineering, University of Northumbria, Newcastle upon Tyne NE1 8QH, UK
3
School of Mechanical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
*
Author to whom correspondence should be addressed.
Materials 2020, 13(22), 5225; https://doi.org/10.3390/ma13225225
Received: 17 September 2020
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Revised: 16 November 2020
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Accepted: 16 November 2020
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Published: 19 November 2020
(This article belongs to the Collection Damping Materials)
Phononic crystals (PnCs) and metamaterials are widely investigated for vibration suppression owing to the bandgaps, within which, wave propagation is prohibited or the attenuation level is above requirements. The application of PnCs and metamaterials is, however, limited by the widths of bandgaps. The recently developed rainbow structures consisting of spatially varied profiles have been shown to generate wider bandgaps than periodic structures. Inspired by this design strategy, rainbow metamaterials composed of nonperiodic mass blocks in two-dimensional (2D) space were proposed in the present study. The blocks were connected by curved beams and tessellated with internal voids to adjust their masses. In order to demonstrate the effects of the rainbow design, two 2D metamaterials, with periodic and nonperiodic units, respectively, were investigated and manufactured using additive manufacturing technologies. Receptance functions, i.e., displacement frequency response functions, of the manufactured metamaterials were calculated with finite element models and measured with a testing system containing a mechanical shaker, an impedance head, and a laser Doppler vibrometer. The obtained numerical and experimental results showed that the metamaterial with rainbow blocks has extended bandgaps compared with the periodic metamaterial.
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Keywords:
2D metamaterials; bandgaps; rainbow; experimental; additive manufacturing
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MDPI and ACS Style
Meng, H.; Chronopoulos, D.; Bailey, N.; Wang, L. Investigation of 2D Rainbow Metamaterials for Broadband Vibration Attenuation. Materials 2020, 13, 5225. https://doi.org/10.3390/ma13225225
AMA Style
Meng H, Chronopoulos D, Bailey N, Wang L. Investigation of 2D Rainbow Metamaterials for Broadband Vibration Attenuation. Materials. 2020; 13(22):5225. https://doi.org/10.3390/ma13225225
Chicago/Turabian StyleMeng, Han, Dimitrios Chronopoulos, Nick Bailey, and Lei Wang. 2020. "Investigation of 2D Rainbow Metamaterials for Broadband Vibration Attenuation" Materials 13, no. 22: 5225. https://doi.org/10.3390/ma13225225
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