This work presents a strategy to design three-dimensional elastic periodic structures endowed with complete bandgaps, the first of which is ultra-wide, where the top limits of the first two bandgaps are overstepped in terms of wave transmission in the finite structure. Thus, subsequent bandgaps are merged, approaching the behaviour of a three-dimensional low-pass mechanical filter. This result relies on a proper organization of the modal characteristics, and it is validated by performing numerical and analytical calculations over the unit cell. A prototype of the analysed layout, made of Nylon by means of additive manufacturing, is experimentally tested to assess the transmission spectrum of the finite structure, obtaining good agreement with numerical predictions. The presented strategy paves the way for the development of a class of periodic structures to be used in robust and reliable wave attenuation over a wide frequency band.
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4 December 2017
Research Article|
December 05 2017
Mechanical low-frequency filter via modes separation in 3D periodic structures
L. D'Alessandro;
L. D'Alessandro
1
Department of Civil and Environmental Engineering, Politecnico di Milano
, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
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E. Belloni
;
E. Belloni
2
Department of Mechanical Engineering, Politecnico di Milano
, Via Giuseppe La Masa, 1, 20156 Milano, Italy
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R. Ardito;
R. Ardito
1
Department of Civil and Environmental Engineering, Politecnico di Milano
, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
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F. Braghin;
F. Braghin
2
Department of Mechanical Engineering, Politecnico di Milano
, Via Giuseppe La Masa, 1, 20156 Milano, Italy
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A. Corigliano
1
Department of Civil and Environmental Engineering, Politecnico di Milano
, Piazza Leonardo da Vinci, 32, 20133 Milano, Italy
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a)
Electronic mail: alberto.corigliano@polimi.it
Appl. Phys. Lett. 111, 231902 (2017)
Article history
Received:
July 12 2017
Accepted:
November 10 2017
Citation
L. D'Alessandro, E. Belloni, R. Ardito, F. Braghin, A. Corigliano; Mechanical low-frequency filter via modes separation in 3D periodic structures. Appl. Phys. Lett. 4 December 2017; 111 (23): 231902. https://doi.org/10.1063/1.4995554
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