Vibration Characteristics of Spoke-Like Vibration Isolator Based on Locally Resonant Phononic Crystal Plates

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (15) : 43-50.

ZHAO Haojiang1 SONG Yang2 LIU Rongqiang3

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Abstract

A design of spoke-like vibration isolators composed of three-component phononic crystal plates is introduced based on the locally resonant mechanism of vibration band gaps. The low-frequency vibration characteristics of the proposed isolators are investigated through vibration gap calculation, finite element simulation and experiment. Results show that a spoke-like base plate is more effective to obtain vibration attenuation amplitudes in the gap frequency range than a rounded base plate. Periodic holes on the base plate of spoke-like pillared phononic crystal plate can enlarge the gap width by raising cutoff frequency of the vibration gap. Based on three spoke-like plates with different unit cells of double-side pillared plates, three isolators with one spoke-like plate, six isolators with two spoke-like plates and six isolators with three spoke-like plates are designed and investigated. Experimental results show that the average vibration attenuation amplitudes of the proposed spoke-like isolators with one, two and three spoke-like double-side pillared phononic crystal plates (DSPPCPs) can reach 24dB, 34dB and 38dB respectively. The structure design and investigation results provide potential applications prospect in the low-frequency vibration reduction.

Key words

Phononic crystal / Local resonance / Vibration isolator / Low-frequency gap

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ZHAO Haojiang1 SONG Yang2 LIU Rongqiang3. Vibration Characteristics of Spoke-Like Vibration Isolator Based on Locally Resonant Phononic Crystal Plates[J]. Journal of Vibration and Shock, 2017, 36(15): 43-50

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