Experimental evidence of multi-complete bandgaps in compound lattice phononic crystal

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (11) : 129-133.

ZHAO Huan-yu1 YAN Zhu-mei1 GAI Xiao-ling 2 LIU Bing-fei 3

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Abstract

Phononic crystals are man-made materials possessing rich physical properties to tune propagation of elastic waves or acoustic beyond nature material. Since the structures with compound Bravais lattices may reduce its lattice symmetry, it is show that these lattice structures can generate more complete bandgaps, which prohibit transmission of waves. In this paper, A 6-atom unit cell phononic crystal composed of (3.4.6.4) lattice array of circular steel cylinders in water is devised. Based on the ultrasonic immersion transmission technique, the experimental transmission spectra of bandgaps are measured as the acoustic waves propagate through the phononic crystal in the Γ-K and Γ-M directions. The measured experiment results of frequency ranges of eight complete bandgaps are well consistent with the theoretical values using the ﬁnite element method. Further, the eigenmodes and localized effects of complete bandgaps are analyzed in detail. It is very important to design the controlling noise materials of numerous complete bandgaps in the wider frequency ranges.

Key words

phononic crystal / complex lattice / muilti-complete bandgaps / experimental evidence

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ZHAO Huan-yu1 YAN Zhu-mei1 GAI Xiao-ling 2 LIU Bing-fei 3 . Experimental evidence of multi-complete bandgaps in compound lattice phononic crystal[J]. Journal of Vibration and Shock, 2017, 36(11): 129-133

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