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Open AccessArticle

Analysis of the Cause and Mechanism of Hydraulic Gate Vibration during Flood Discharging from the Perspective of Structural Dynamics

by Jijian Lian 1, Lin Chen 1, Bin Ma 1,* and Chao Liang 1,2,3
1
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China
2
Postdoctoral Workstation, Yellow River Engineering Consulting Co., Ltd., Zhengzhou 450003, China
3
Postdoctoral Research Station of Water Conservancy Engineering, Hohai University, Nanjing 210098, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(2), 629; https://doi.org/10.3390/app10020629 (registering DOI)
Received: 12 November 2019 / Revised: 6 January 2020 / Accepted: 10 January 2020 / Published: 15 January 2020
(This article belongs to the Special Issue Advances on Structural Engineering)
According to the results of a dynamic prototype test for the surface outlet radial gate on the Jinping high arch dam during the flood discharging process, a novel cause of vibration fundamentally different from the traditional causes of flow-induced radial gate vibration, is analyzed for the first time. Under the condition that the flood is discharged only from mid-level outlets, an accompanying vibration of the surface outlet gate is induced by the vibration of the closely spaced mid-level outlet gates. It is counterintuitive that the most intense vibration occurs when the surface outlet gate is closed and, on the contrary, the vibration is reduced when the gate is opened and subjected to flow excitation. In order to analyze and explain this accompanying vibration phenomenon, a theoretical model is developed based on the conventional theory of passive vibration absorbers. The difference between the proposed and conventional theoretical models is that more complex load and damping conditions are considered, and more attention was paid to the dynamic behavior of the accessory structure. Then, the cause and mechanism for the surface outlet gate vibration is clarified in detail, based on the proposed theoretical model. The comprehensive analysis and mutual verification of the prototype test, theoretical derivation and numerical simulation, indicate that the clarification and the proposed theoretical model is reasonable and accurate. The research reported in this paper will be beneficial for the design, operation and maintenance of the hydraulic gates installed on high arch dams. View Full-Text
Keywords: theoretical analysis; accessory structure; hydraulic gate; structural dynamics; vibration amplification mechanism; accompanying vibration; ANSYS finite element software; MATLAB programming software theoretical analysis; accessory structure; hydraulic gate; structural dynamics; vibration amplification mechanism; accompanying vibration; ANSYS finite element software; MATLAB programming software
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Lian, J.; Chen, L.; Ma, B.; Liang, C. Analysis of the Cause and Mechanism of Hydraulic Gate Vibration during Flood Discharging from the Perspective of Structural Dynamics. Appl. Sci. 2020, 10, 629.

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