变质量贮箱类流固耦合系统的振动响应及时频特性分析

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 166-171.

论文

变质量贮箱类流固耦合系统的振动响应及时频特性分析

马驰骋1，张希农1，柳征勇2，胡迪科2

作者信息 +

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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文章历史 +

摘要

研究了变质量贮箱类流固耦合系统的动力学特性。根据虚拟质量法，使用有限单元法构建了变质量贮箱类流固耦合系统的动力学模型，建模过程中着重考虑了质量变化对系统的影响。通过Newmark直接积分法计算出变质量贮箱时变系统的振动响应，分析了不同质量变化率对变质量贮箱系统动力响应的影响，并借助平滑伪Wigner-Ville变换获得变质量贮箱时变系的统动力响应时频谱。结果表明：由于系统质量减少，引起了系统振动频率的增大，并产生一个附加的负阻尼。这个负阻尼的大小与系统的质量变化率成正比。对比不同质量变化率和不同结构阻尼变质量贮箱的动力响应及时频特性，系统的振动频率的范围可以通过系统质量的范围确定，而且当附加负阻尼的作用超过系统结构阻尼的作用时，会使得系统的振动振幅增大，引起系统的不稳定。平滑伪Wigner-Ville变换是处理非平稳信号的一种有效工具。

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.

导出引用

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]. 振动与冲击, 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[J]. Journal of Vibration and Shock, 2014, 33(21): 166-171