Optimal design and position of an embedded one-dimensional acoustic black hole

Cameron A. McCormick, Micah R. Shepherd

Research output: Contribution to conferencePaper

4 Citations (Scopus)

Abstract

Structures whose thickness is tapered according to a power law exhibit the 'acoustic black hole' effect, and can be used for effective vibration reduction without adding mass. In this paper, we consider the problem of a one-dimensional acoustic black hole (ABH) with a free damping layer, embedded in a simply-supported beam which is excited by a harmonic force. The objective is to find the ABH design and position along the beam that simultaneously minimize the surface averaged square velocity response of the beam and the total mass of the beam. To determine the optimal design and position, a multi-objective evolutionary algorithm has been coupled with an automated meshing algorithm and commercial finite element software. The input variables are the taper profile of the ABH, the amount of damping, and the position of the ABH along the beam. Results of the optimization indicate that competition between design criteria exists, but only below a certain threshold. Optimization-based techniques like this can be applied to ABH design for more complex structures and can prove a valuable resource for noise control engineering.

Original languageEnglish (US)
StatePublished - Jan 1 2018
Event47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018 - Chicago, United States
Duration: Aug 26 2018Aug 29 2018

Other

Other47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018
CountryUnited States
CityChicago
Period8/26/188/29/18

Fingerprint

acoustics
damping
optimization
tapering
resources
engineering
computer programs
harmonics
vibration
thresholds
profiles

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

Cite this

McCormick, C. A., & Shepherd, M. R. (2018). Optimal design and position of an embedded one-dimensional acoustic black hole. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Chicago, United States.
McCormick, Cameron A. ; Shepherd, Micah R. / Optimal design and position of an embedded one-dimensional acoustic black hole. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Chicago, United States.
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McCormick, CA & Shepherd, MR 2018, 'Optimal design and position of an embedded one-dimensional acoustic black hole' Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Chicago, United States, 8/26/18 - 8/29/18, .

Optimal design and position of an embedded one-dimensional acoustic black hole. / McCormick, Cameron A.; Shepherd, Micah R.

2018. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Chicago, United States.

Research output: Contribution to conferencePaper

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McCormick CA, Shepherd MR. Optimal design and position of an embedded one-dimensional acoustic black hole. 2018. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Chicago, United States.