Wave characteristics of axial multi-dynamic absorber in liquid-filled pipeline

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (5) : 261-266.

WU Jianghai, SUN Yudong, YIN Zhiyong, SU Mingzhu

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Abstract

In order to suppress the propagation of axial vibration wave in liquid filled pipe, the transfer matrix method is proposed to establish the dynamic coupling model of fluid filled pipe with multiple axial dynamic vibration absorbers(DVA). The present method is validated by compared dynamic response and natural frequency with FEM. Reflection and transmission coefficient of axial wave before and after DVA are analyzed, and the vibration band gap of pipeline is calculated when the DVAs are arranged periodically. The research results show that: axial waves are all reflected at the resonant frequency of the DVA, reflection bandwidth vary with the stiffness and damping. When DVAs are distributed periodically, there exists both Bragg and Locally Resonant(LR) band gap. The axial wave in effectively controlled in the LR band gap. This research can provide reference for the design of axial vibration reducing and DVA.

Key words

fluid filled pipe / wave properties / dynamic vibration absorber / band gap / transfer matrix method

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WU Jianghai, SUN Yudong, YIN Zhiyong, SU Mingzhu. Wave characteristics of axial multi-dynamic absorber in liquid-filled pipeline[J]. Journal of Vibration and Shock, 2022, 41(5): 261-266

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