RESEARCH ON TRANSMISSION CHARACTERISTICS OF LONGITUDINAL VIBRATION OF PHONONIC CRYSTAL ROD WITH CONCENTRATED MASS BORDER

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (19) : 113-117.

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RESEARCH ON TRANSMISSION CHARACTERISTICS OF LONGITUDINAL VIBRATION OF PHONONIC CRYSTAL ROD WITH CONCENTRATED MASS BORDER

SHU Hai-sheng，LIU Shao-gang, WANG Wei-yuan, ZHAO Dan, ZHANG Fa

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Abstract

In order to obtain the transmission characteristics of longitudinal vibration of phononic crystal rod with concentrated mass border, epoxy rod, aluminum rod and “epoxy + aluminum” pononic crystal rod were build and the transmissibility curves of the longitudinal vibration of these rods were calculated between 0~50KHz with free border and concentrated mass border respectively. Furthermore, the influence of different concentrated masses on transmissibility was analyzed. The results of analysis showed that: with free border condition epoxy both of rod and aluminum rod have no ability of vibration reduction while three obvious stop bands can be found in phononic crystal rod; with concentrated mass border vibration can be reduced in a wide frequency band both in epoxy rod and aluminum rod while many resonance humps can be found in their transmissibility curves which would be harmful to vibration reduction. Vibration can be suppressed apparently by the effect of stop bands in phononic crystal rod and therefore the vibration reduction ability was improved much more. Nevertheless, sharp resonance hump may be brought about which would impair the ability of vibration reduction distinctly; with the increase of the concentrated mass the vibration reduction ability of three types of rods could be enhanced.

Key words

phononic crystal rod / longitudinal vibration / transmissibility / concentrated mass / stop band

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SHU Hai-sheng;LIU Shao-gang;WANG Wei-yuan;ZHAO Dan;ZHANG Fa. RESEARCH ON TRANSMISSION CHARACTERISTICS OF LONGITUDINAL VIBRATION OF PHONONIC CRYSTAL ROD WITH CONCENTRATED MASS BORDER[J]. Journal of Vibration and Shock, 2012, 31(19): 113-117