STUDY ON BAND GAPS OF NESTING COMPLEX TRIANGULAR LATTICE PHONONIC CRYSTAL WITH SOLID/AIR SYSTEM

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (8) : 121-123.

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STUDY ON BAND GAPS OF NESTING COMPLEX TRIANGULAR LATTICE PHONONIC CRYSTAL WITH SOLID/AIR SYSTEM

HU Jia-guang1,2, ZHANG Jin 2, JING Shou-yong3

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Abstract

The plane wave expansion method was employed to calculate the elastic wave band gaps of new nesting complex triangular lattice phononic crystal composed of steel columns embedded in air matrix, and each single column basis is replaced by two tangency-columns.Numerical results show that, compared with the simple triangular lattice phononic crystal, the wider band gaps appear at lesser filling-fraction and lower frequency area are easy to be obtained, at the same filling-fraction, the widest first band gap for the nesting complex triangular lattice is 4.4 times wider than that of the first band gap width of simple triangular lattice, and its mid-gap frequency is only half of the first mid-gap frequency of simple triangular lattice.

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phononic crystal / band structure / elastic wave band gap / plane wave expansion method

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HU Jia-guang;ZHANG Jin;JING Shou-yong. STUDY ON BAND GAPS OF NESTING COMPLEX TRIANGULAR LATTICE PHONONIC CRYSTAL WITH SOLID/AIR SYSTEM[J]. Journal of Vibration and Shock, 2009, 28(8): 121-123