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Published on: April 28, 2016
Wave propagation in granular chains with local resonances.
Luca Bonanomi1, Georgios Theocharis2,3, Chiara Daraio1,2
1Department of Mechanical and Process Engineering, Swiss Federal Institute of Technology (ETH), Zürich 8092, Switzerland.
This study demonstrates acoustic wave propagation control in a particle chain with local resonators. Researchers observed a wide band gap and tunable transmission, with nonlinear effects generating harmonics and localized modes.
Area of Science:
- Acoustics
- Materials Science
- Nonlinear Dynamics
Background:
- Wave propagation in discrete systems is crucial for phononic crystals.
- Local resonators offer a method to manipulate wave transmission.
- Understanding nonlinear effects is key for advanced acoustic devices.
Purpose of the Study:
- To investigate wave propagation in a chain of spherical particles with local resonators.
- To characterize the dynamic response and acoustic transmission spectra.
- To explore the influence of nonlinearity on wave behavior.
Main Methods:
- Theoretical modeling of wave propagation.
- Experimental characterization of individual resonant particles.
- Analysis of transmitted linear and nonlinear spectra in particle chains.
Main Results:
- Observation of a wide acoustic band gap in both theoretical and experimental results.
- Demonstration of tunable acoustic transmission by adjusting inter-particle contact.
- Experimental observation of resonant frequency downshift in single particles under high amplitude.
- Generation of nonlinear harmonics and localized modes within the band gap due to nonlinearity.
Conclusions:
- The studied particle chain with local resonators exhibits tunable wave propagation properties.
- Nonlinear phenomena significantly impact acoustic transmission, enabling advanced control.
- The system shows potential for applications in acoustic filtering and wave localization.
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