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Wavenumber transform analysis for acoustic black hole design.
Philip A Feurtado1, Stephen C Conlon1
1Applied Research Laboratory, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
The Journal of the Acoustical Society of America
|August 1, 2016
Summary
Acoustic black holes (ABHs) effectively reduce structural vibration and sound by altering wave propagation. Wavenumber analysis visualizes ABH performance, confirming acoustic decoupling and vibration reduction for practical applications.
Area of Science:
- Structural acoustics
- Vibration analysis
- Materials science
Background:
- Acoustic black holes (ABHs) are passive vibration absorbers that reduce structural vibration and radiated sound.
- ABHs utilize local thickness changes to slow bending waves and amplify vibration amplitudes for energy dissipation.
Purpose of the Study:
- To investigate wavenumber analysis for characterizing, designing, and optimizing embedded Acoustic Black Hole (ABH) systems.
- To analyze the structural acoustic coupling and radiation efficiency of ABH plates.
Main Methods:
- Transforming measured vibratory response of embedded ABH plates into the wavenumber domain.
- Utilizing wavenumber transform analysis to visualize wave speed, vibration amplitude, and energy dissipation.
- Comparing the radiation efficiency of ABH plates to uniform plates.
Main Results:
- Wavenumber transform analysis effectively visualizes multiple ABH performance aspects.
- The analysis confirmed changes in bending wave speed, vibration amplitude, and energy dissipation.
- ABH plates demonstrated acoustic decoupling and reduced vibration compared to uniform plates.
Conclusions:
- Wavenumber transform analysis is a valuable tool for understanding and optimizing ABH systems.
- The ABH effect provides both vibration reduction and acoustic decoupling.
- These findings support the implementation of ABHs in real-world structures.
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