Progressive phase trends in plates with embedded acoustic black holes

The Journal of the Acoustical Society of America
Stephen C Conlon, Philip A Feurtado

Abstract

Acoustic black holes (ABHs) have been explored and demonstrated to be effective passive treatments for broadband noise and vibration control. Performance metrics for assessing damping concepts are often focused on maximizing structural 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 whose vibration input-output response follows that of an infinite structure. The vibration mobility transfer functions between locations on a structure can be used to assess the structure's vibration response phase, and compare its phase response characteristics to those of idealized systems. This work experimentally explores the phase accumulation in finite plates, with and without embedded grids of ABHs. The measured results are compared and contrasted 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 ...Continue Reading

References

Jul 30, 2014·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Victor Krylov
Aug 7, 2014·The Journal of the Acoustical Society of America·Philip A FeurtadoFabio Semperlotti
Jan 27, 2015·The Journal of the Acoustical Society of America·Stephen C ConlonFabio Semperlotti
Aug 1, 2016·The Journal of the Acoustical Society of America·Philip A Feurtado, Stephen C Conlon
Dec 5, 2016·The Journal of the Acoustical Society of America·Micah R ShepherdStephen C Conlon
Apr 5, 2017·The Journal of the Acoustical Society of America·Jae Yeon Lee, Wonju Jeon

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Citations

Jul 1, 2019·The Journal of the Acoustical Society of America·K HookS Daley
Feb 4, 2019·The Journal of the Acoustical Society of America·Nansha GaoAnastasiia O Krushynska

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