Papers
Release Time: 2025-04-30Hits:
- Date:2025-04-30
- Title of Paper:Ultra-low-frequency broadband of a new-type acoustic metamaterial beams with stiffness array
- Journal:J. Phys. D: Appl. Phys.
- Summary:Periodic structures are effective in attenuating waves in a low frequency range at local
resonance (LR) conditions, but it is still a challenge to achieve this in a very low frequency
range, because the system stability can be damaged due to the excessive quality or the
deduction of stiffness. However, the structural stability theory shows that the structural
stability is closely related to the support surface; the larger the support surface, the more stable
the structure, and thereby the array structure has the feature of maintaining the stability of the
system through expanding the support surface. Based on the theoretical principle, a new type
of local resonator with stiffness arrays is presented to further lower the band gaps of flexural
wave propagation in LR beams, in which the traditional stiffness is equally divided into an
array form. Due to the stiffness array connections, the system stiffness is not only reduced to
a very low value, but also the stability is still better maintained through expanding the support
surface. Meanwhile, the band structures of the LR beams with stiffness array connections,
obtained by the fnite element method, demonstrate that the lower bound of the band-gap can
be successfully decreased more times than that of conventional LR beams under the premise
of maintaining the stability of the system, and an ultra-low-frequency broadband of 25–395
Hz is realized. Clearly, the strategy of dividing the traditional stiffness into the stiffness array
can successfully realize the low frequency band gap and overcome the shortcomings of the
system instability in the traditional method. Therefore, two puzzles of realizing the ultra-lowfrequency broadband and simultaneously maintaining the system stability may be successfully
resolved through introducing the stiffness arrays into the local resonance system, and the
new structures with stiffness arrays could have potential applications for ultra-low-frequency
vibration and noise attenuation. - Co-author:Yongyan Zhang, Jiu Hui Wu
- Volume:Vol.50, No.17
- Page Number:355104(7 pages), 2017
- Translation or Not:No
- Date of Publication:2017-07-03
