The vibration analysis of steam generator support plates coupled with fluids by integral transformation method
In large-scale power system equipments the support plates are most commonly used in fluid containing steam and water two-phase flow. It is important to study vibration performance of perforated plates under two-phase flow case with a lower vapor fraction against possible failures caused by lower structural integrity. After performing simplification by equivalent isotropic solid plate for perforated plates and effective homogeneous liquid fluid for fluid two-phase flow the steam generator support plate can be modeled by submerged circular plate. This paper deals with the vibrations of multiple circular plates coupled with a finite depth and infinite width fluid domain. The effect of liquid depth on the vibration of circular plates is discussed in detail. The mathematical analysis methodologies and mechanical models concerning with fluid-structure interaction (FSI) to solve the modal problems of submerged circular plate are expatiated, including the establishment of the fundamental assumptions, governing equations and boundary conditions. The added virtual mass effect due to the presence of fluid on the submerged circular plate is analyzed by integral transformation technique and via the approach of separation of variables. Theoretical calculation results are given in non-dimensional form for circular plates submerged in liquid in order to be ready-to-use in applications. The nondimensionalized added virtual mass incremental (NAVMI) factors for the multiple layer circular plates in contact with liquid including the effect of the liquid depth are computed theoretically. The results show that the natural frequencies of plates decrease with increment of fluid depth. In particularly the influence of the fluid depth on the vibrations of multiple layer circular plates is significant. It is found that the NAVMI factor keeps constant when the fluid depth is greater than the diameter of the circular plates. The numerical results also show that NAVMI factors increase rapidly as the liquid depth becomes shallow. It means that the fluid-structure interaction effect is strong or the fluid mass damping increases as the liquid depth decreases.
Vibration Support plate Fluid-structure interaction Added virtual mass Integral transformation
Tong Liu Qiwu Dong Minshan Liu
Thermal energy engineering research center of Zhengzhou University, Zhengzhou 450001, China
国际会议
2011 International Symposium on Structural Integrity 2011国际结构完整性学术研讨会--核工程结构完整性技术 ISSI 2011
合肥
英文
295-300
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）