Wavenumber transform analysis for acoustic black hole design
| Autor: | Philip A. Feurtado, Stephen C. Conlon |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Acoustics and Ultrasonics Acoustics 02 engineering and technology Decoupling (cosmology) Bending Dissipation 01 natural sciences Vibration 020303 mechanical engineering & transports Amplitude Vibration isolation 0203 mechanical engineering Arts and Humanities (miscellaneous) 0103 physical sciences Wavenumber 010301 acoustics Beam (structure) |
| Zdroj: | The Journal of the Acoustical Society of America. 140:718-727 |
| ISSN: | 0001-4966 |
| DOI: | 10.1121/1.4959023 |
| Popis: | Acoustic black holes (ABHs) are effective, passive, lightweight vibration absorbers that have been developed and shown to effectively reduce the structural vibration and radiated sound of beam and plate structures. ABHs employ a local thickness change that reduces the speed of bending waves and increases the transverse vibration amplitude. The vibrational energy can then be effectively focused and dissipated by material losses or through conventional viscoelastic damping treatments. In this work, the measured vibratory response of embedded ABH plates was transformed into the wavenumber domain in order to investigate the use of wavenumber analysis for characterizing, designing, and optimizing practical ABH systems. The results showed that wavenumber transform analysis can be used to simultaneously visualize multiple aspects of ABH performance including changes in bending wave speed, transverse vibration amplitude, and energy dissipation. The analysis was also used to investigate the structural acoustic coupling of the ABH system and determine the radiation efficiency of the embedded ABH plates compared to a uniform plate. The results demonstrated that the ABH effect results in acoustic decoupling as well as vibration reduction. The wavenumber transform based methods and results will be useful for implementing ABHs into real world structures. |
| Databáze: | OpenAIRE |
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