Local resonance and Bragg bandgaps in sandwich beams containing periodically inserted resonators. (3rd March 2016)

• Record Type: Journal Article
• Authors: Sharma, B.; Sun, C.T.
• Is Part Of: Journal of sound and vibration. Volume 364(2016)
• Page Start: 133
• Page End: 146
• Publication Date: 2016-03-03
• Subjects: Flexural wave attenuation -- Periodic structure -- Local resonance bandgap -- Bragg bandgap -- bandgap interaction; Sound -- Periodicals; Vibration -- Periodicals; Son -- Périodiques; Vibration -- Périodiques; Sound; Vibration; Periodicals; Electronic journals; 620.205
• DOI: 10.1016/j.jsv.2015.11.019
• Languages: English
• ISSNs: 0022-460X

Abstract

Abstract: We study the low frequency wave propagation behavior of sandwich beams containing periodically embedded internal resonators. A closed form expression for the propagation constant is obtained using a phased array approach and verified using finite element simulations. We show that local resonance and Bragg bandgaps coexist in such a system and that the width of both bandgaps is a function of resonator parameters as well as their periodicity. The interaction between the two bandgaps is studied by varying the local resonance frequency. We find that a single combined bandgap does not exist for this system and that the Bragg bandgaps transition into sub-wavelength bandgaps when the local resonance frequency is above their associated classical Bragg frequency.