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Response variability of broadband multi- frequency metastructure from additive manufacturing

Fabro, Adriano T.; Meng, Han; Chronopoulos, Dimitrios

Authors

Adriano T. Fabro

Han Meng

Dimitrios Chronopoulos



Abstract

Additive manufacturing has been used to propose several designs of phononic crystals and metamate-rials due to the low cost to produce complex geometrical features. However, like any other manufacturing process, it can introduce material and geometrical variability in the nominal design and therefore affect the structural dynamic performance. Locally resonant metamaterials are typically designed such that the distributed resonators have the same natural frequency or, in the case of rainbow meta-structures, a well-defined spatial profile. In this work, manufacturing tolerances of beam samples produced from a Selective Laser Sintering process are assessed and variability levels are used to investigate the vibration suppression performance of broadband multi-frequency metastructures. Evenly spaced non-symmetric resonators are attached to a beam with U-shaped cross-section. An analytical model based on a transfer matrix approach is used to calculate transfer receptance due to a point time harmonic force. Moreover, a random field model is assumed based in previous experimental results and the effects of the correlation length, a measure of the spatial fluctuation, are also investigated for individual beams and also in terms of ensemble statistics. The obtained results are expected to be useful for further robust design in mass produced industrial applications.

Citation

Fabro, A. T., Meng, H., & Chronopoulos, D. (2019). Response variability of broadband multi- frequency metastructure from additive manufacturing. In Proceedings of the 26th International Congress on Sound and Vibration (ICSV 2019)

Conference Name ICSV26
Start Date Jul 7, 2019
End Date Jul 11, 2019
Acceptance Date May 4, 2019
Publication Date Jul 9, 2019
Deposit Date Oct 23, 2019
Publicly Available Date Oct 28, 2019
Publisher Canadian Acoustical Association
Book Title Proceedings of the 26th International Congress on Sound and Vibration (ICSV 2019)
ISBN 9781999181000
Keywords vibration attenuation; rainbow metamaterial; additive manufacturing; uncertainties
Public URL https://nottingham-repository.worktribe.com/output/2945625
Publisher URL https://iiav.org/archives_icsv/2019_icsv26/content/papers/papers/full_paper_881_20190504003731727.pdf
Related Public URLs http://www.icsv26.org/
https://iiav.org/archives_icsv/2019_icsv26/index.html
Additional Information Copyright © International Institute of Acoustics and Vibration (IIAV), 2019

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