PMID- 29195477
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20190529
IS  - 1520-8524 (Electronic)
IS  - 0001-4966 (Linking)
VI  - 142
IP  - 5
DP  - 2017 Nov
TI  - Ultrawide band gaps in beams with double-leaf acoustic black hole indentations.
PG  - 2802
LID - 10.1121/1.5009582 [doi]
AB  - Band gaps in conventional phononic crystals (PCs) are attractive for applications
      such as vibration control, wave manipulation, and sound absorption. Their
      practical implementations, however, are hampered by several factors, among which 
      the large number of cells required and their impractically large size to ensure
      the stopbands at reasonably low frequencies are on the top of the list. This
      paper reports a type of beam carved inside with two double-leaf acoustic black
      hole indentations. By incorporating the local resonance effect and the Bragg
      scattering effect generated by a strengthening stud connecting the two branches
      of the indentations, ultrawide band gaps are achieved. Increasing the length of
      the stud or reducing the residual thickness of the indentation allows the tuning 
      of the band gaps to significantly enlarge the band gaps, which can exceed 90% of 
      the entire frequency range of interest. Experimental results show that with only 
      three cells, the proposed beam allows considerable vibration energy attenuation
      within an ultra-broad frequency range including the low frequency range, which
      conventional PCs can hardly reach. Meanwhile, the proposed configuration also
      enhances the structural integrity, thus pointing at promising applications in
      vibration control and a high performance wave filter design.
FAU - Tang, Liling
AU  - Tang L
AD  - Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung 
      Hom, Kowloon, Hong Kong 999077, China.
FAU - Cheng, Li
AU  - Cheng L
AD  - Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung 
      Hom, Kowloon, Hong Kong 999077, China.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - United States
TA  - J Acoust Soc Am
JT  - The Journal of the Acoustical Society of America
JID - 7503051
EDAT- 2017/12/03 06:00
MHDA- 2017/12/03 06:01
CRDT- 2017/12/03 06:00
PHST- 2017/12/03 06:00 [entrez]
PHST- 2017/12/03 06:00 [pubmed]
PHST- 2017/12/03 06:01 [medline]
AID - 10.1121/1.5009582 [doi]
PST - ppublish
SO  - J Acoust Soc Am. 2017 Nov;142(5):2802. doi: 10.1121/1.5009582.