Phase accumulation in plates with embedded Acoustic Black Holes

Stephen Conlon, Philip Feurtado

Research output: Contribution to conferencePaper

Abstract

Embedded Acoustic Black Holes (ABH) have been explored and shown to be effective passive treatments for broadband noise and vibration control. Performance metrics for assessing ABH and other new damping concepts are often focused on maximizing modal and broadband damping loss factors. Optimally performing damping treatments can reduce the resonant response of a driven system well below the direct field response. This results in a finite structure that responds like an infinite structure. The vibration transfer functions between locations on a structure can be used to assess the structure’s vibration response phase and compare / contrast its phase response characteristics to idealized finite and infinite system response characteristics. This work experimentally explores the phase accumulation in finite plates with and without embedded ABHs. The measured results are compared with theoretical results for finite and infinite uniform plates. Accumulated phase characteristics, their spatial dependence and limits, are examined for the plates and compared to theoretical estimates. The phase accumulation results show that the embedded Acoustic Black Hole treatments can significantly enhance the damping of the plates to the point that their phase accumulation trends follow that of an infinite plate.

Original languageEnglish (US)
StatePublished - Jan 1 2017
Event46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017 - Hong Kong, China
Duration: Aug 27 2017Aug 30 2017

Other

Other46th International Congress and Exposition on Noise Control Engineering: Taming Noise and Moving Quiet, INTER-NOISE 2017
CountryChina
CityHong Kong
Period8/27/178/30/17

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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