Vibroacoustic properties of plates with tuned Acoustic Black Holes

Research output: Contribution to conferencePaper

Abstract

The Acoustic Black Hole (ABH) is a novel effective passive vibration control method for attenuating bending wave speeds by asymptotically diminishing the beam or plate structural thickness. The wave speed reduction also affects the structural-acoustic radiation and response. It has been shown that embedded ABH cells have a negligible effect on vibration and radiated sound below the first local ABH mode, “cut-on frequency,” which is a critical parameter for improving the low frequency performance of the ABH structural system. In this paper, an investigation was conducted to evaluate, and tailor, the vibration response and resulting structural-acoustic radiation by attaching discrete tuning masses at the center position of each ABH cell. The first local ABH modes were tuned to lower frequencies in order to improve the low frequency vibroacoustic performance of the plate structures. Finite element models were used to evaluate the vibration response, modal loss factors and radiation efficiency performance for several plate configurations. Uniform plates were also modeled as a baseline for comparing to the ABH plates with and without tuning masses. Varying the tuning of adjacent ABH cells exhibited extended effective bandwidth in the reduction of the plate radiation coupling.

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
vibration
tuning
low frequencies
sound waves
cells
modal response
radiation
bandwidth
configurations

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

Cite this

Xiong, Y., Smith, E., & Conlon, S. C. (2018). Vibroacoustic properties of plates with tuned Acoustic Black Holes. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Chicago, United States.
Xiong, Yu ; Smith, Edward ; Conlon, Stephen Clarke. / Vibroacoustic properties of plates with tuned Acoustic Black Holes. 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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Xiong, Y, Smith, E & Conlon, SC 2018, 'Vibroacoustic properties of plates with tuned Acoustic Black Holes' 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, .

Vibroacoustic properties of plates with tuned Acoustic Black Holes. / Xiong, Yu; Smith, Edward; Conlon, Stephen Clarke.

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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AU - Conlon, Stephen Clarke

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N2 - The Acoustic Black Hole (ABH) is a novel effective passive vibration control method for attenuating bending wave speeds by asymptotically diminishing the beam or plate structural thickness. The wave speed reduction also affects the structural-acoustic radiation and response. It has been shown that embedded ABH cells have a negligible effect on vibration and radiated sound below the first local ABH mode, “cut-on frequency,” which is a critical parameter for improving the low frequency performance of the ABH structural system. In this paper, an investigation was conducted to evaluate, and tailor, the vibration response and resulting structural-acoustic radiation by attaching discrete tuning masses at the center position of each ABH cell. The first local ABH modes were tuned to lower frequencies in order to improve the low frequency vibroacoustic performance of the plate structures. Finite element models were used to evaluate the vibration response, modal loss factors and radiation efficiency performance for several plate configurations. Uniform plates were also modeled as a baseline for comparing to the ABH plates with and without tuning masses. Varying the tuning of adjacent ABH cells exhibited extended effective bandwidth in the reduction of the plate radiation coupling.

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Xiong Y, Smith E, Conlon SC. Vibroacoustic properties of plates with tuned Acoustic Black Holes. 2018. Paper presented at 47th International Congress and Exposition on Noise Control Engineering: Impact of Noise Control Engineering, INTER-NOISE 2018, Chicago, United States.