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.
马驰骋;张希农;柳征勇;胡迪科. 变质量贮箱类流固耦合系统的振动响应及时频特性分析[J]. , 2014, 33(21): 166-171.
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. , 2014, 33(21): 166-171.