Dynamic responses and time frequency feature analysis for a fluid-structure coupling system with variable mass in a tank

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (21) : 166-171.

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Dynamic responses and time frequency feature analysis for a fluid-structure coupling system with variable mass in a tank

Ma Chicheng1 Zhang Xinong1 Liu Zhengyong 2 Hu Dike 2

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Abstract

In this paper, dynamic responses and time frequency feature analysis for a fluid-structure coupling system with variable mass in a tank are performed. A finite element model is established by using virtual mass method, including the influence of the change of the mass. The responses of the time varying mass tank are calculated by using Newmark direct integration method. The effect of time varying mass on the dynamic response of the tank system is mainly investigated. The time frequency features of the fluid-structure coupling system are obtained by using smoothed pseudo-Wigner-Ville transformation (SPWVD). Results show that the decrease of the mass induces the increase of the vibration frequencies of the system, and generates an additional negative damping. The additional damping is proportional to rate of change of the mass. Based on the dynamic responses and the time frequency analysis for different conditions, the frequency range can be determined by the range of the mass of the system. The additional negative damping causes the vibration decay slowly, and the additional damping can cause the system vibrate with increasing amplitudes while the mass changes rapidly. Smoothed pseudo-Wigner-Ville distribution is an efficient tool to decompose nonstationary signal.

Key words

elastic tank / fluid-structure coupling / time frequency feature / dynamic response / negative damping

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Ma Chicheng Zhang Xinong Liu Zhengyong Hu Dike . Dynamic responses and time frequency feature analysis for a fluid-structure coupling system with variable mass in a tank[J]. Journal of Vibration and Shock, 2014, 33(21): 166-171