期刊
JOURNAL OF SOUND AND VIBRATION
卷 364, 期 -, 页码 133-146出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2015.11.019
关键词
Flexural wave attenuation; Periodic structure; Local resonance bandgap; Bragg bandgap; bandgap interaction
资金
- Office of Naval Research [N00014-11-1-0580]
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. (C) 2015 Elsevier Ltd. All rights reserved.
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