Stability and sensitivity analysis of the bending-torsional coupled vibration with the arcuate whirl of hydro-turbine generator unit

Shi, Yousong; Zhou, Jing; Lai, Xinjie; Xu, Yanhe; Guo, Wencheng; Liu, Baonan

doi:10.1016/j.ymssp.2020.107306

Cited by 32 publications

(4 citation statements)

References 29 publications

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“…The operation is accompanied by arcuate whirl centrifugal force of the generator and hydro-turbine, which were calculated as follows [38]:…”

Section: Nonlinear Mathematical Modelingmentioning

confidence: 99%

Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

Shi

Zhou

2021

Preprint

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The hydro-turbine governing system (HTGS) and shafting system are mutually coupled. However, the interaction between them has always been neglected. This paper aims to explore the stability and sensitivity of the governor control parameters to the HTGS and shafting system and make the optimal control of the stable operation for the hydro-turbine generator unit(HTGU). First, a novel HTGU motion equation is proposed, which can make connections between the HTGS and the shafting system of the HTGU. And on this basis, the nonlinear coupling mathematical model of the HTGS and the shafting system is established. According to the nonlinear mathematical model, the sensitivity of the governor control parameters on the operating stability of the HTGU is obtained. Then, a multi-objective governor control parameters optimization strategy is proposed. Furthermore, the chaotic-dominated sorting genetic algorithm II(NSGA-II) and multi-objective evolutionary algorithm based on decomposition(MOEAD) were introduced to obtain the optimal control parameter and mutually verify the effectiveness of the optimization effect. Finally, the nonlinear dynamic characteristics of HTGU under optimal control were revealed. The simulation results show that the rotation speed deviation and shafting system vibrations are sensitive on the PID parameters in some ranges and the stable region will be decreased when considering the shafting system vibrations. The multi-objective PID parameter optimization strategy shows good control performance on the nonlinear dynamic characteristics of the HTGU. The shafting system vibrations excited by the coupled vibration sources are quasi-period in 3D space. In addition to this, these results and the optimization strategy can provide some bases for the design and stable operation of the HTGU.

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“…The operation is accompanied by arcuate whirl centrifugal force of the generator and hydro-turbine, which were calculated as follows [38]:…”

Section: Nonlinear Mathematical Modelingmentioning

confidence: 99%

Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

Shi

Zhou

2021

Preprint

Self Cite

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“…When the uncertainties are classified, suitable UQ methods need to be chosen according to their respective prerequisites, working mechanism, numerical performance and whether they are intrusive or nonintrusive. In different uncertainty domains, various UQ approaches [18][19][20], as well as solutions to improve efficiency and accuracy, have been proposed [21][22][23]. Not all procedures are available in specific situations and principles exist for selection [24].…”

Section: Introductionmentioning

confidence: 99%

A state-of-the-art review on uncertainty analysis of rotor systems

Sinou

Zhu

et al. 2023

Mechanical Systems and Signal Processing

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“…Xu [14] introduced a nonlinear modal method based on the finite element method to analyze the dynamic interaction between the subsystems of a Francis turbine, combined with the influence of fluid-structure coupling. Based on the coupling effect, Shi [15] proposed a mathematical model of bent-torsional coupling vibration of an unbalanced rotor for turbine units. Hoerner [16] studied the fluid-structure coupling of the flexible blades of axial-flow turbines by combining numerical simulation and experimental research.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on Numerical Calculation of Modal Characteristics of Pump-Turbine Shaft System

Liu,

Pang,

et al. 2023

JMSE

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Because a pump-turbine mainly undertakes the role of energy conversion and pumped storage in the field of hydropower engineering, the complex transition process and frequent conversion between different working conditions lead to the increase in the stress and strain of core components such as the unit shaft system, and even cause resonance phenomena. Based on ANSYS finite element numerical calculation software, this paper adopts the acoustic fluid–structure coupling method to study the influence of the shaft of the pump-turbine on the dynamic characteristics of the runner. At the same time, the paper analyses the influence of different contact modes between the runner and the shaft on the modal characteristics of the shaft system. The numerical simulation results have shown that the runner is affected by the added mass of the water. The natural frequency reduction rate of each order of wet modal is ranged from 19% to 64%. The main shaft has a greater influence on the simplification of the shaft system calculation method. The type of contact surface between the main shaft and the runner has a smaller influence on the modal characteristics and the natural frequency of the shaft system. The research in this paper contributes an evaluation of the dynamic characteristics of the runner of a hydraulic turbine unit, which is of great significance for the optimization of the analysis algorithm of the runner structure for large pumped storage units.

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Stability and sensitivity analysis of the bending-torsional coupled vibration with the arcuate whirl of hydro-turbine generator unit

Cited by 32 publications

References 29 publications

Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

Stability and Sensitivity Analysis and Optimization Control of the Hydro-turbine Generator Unit

A state-of-the-art review on uncertainty analysis of rotor systems

Comparative Study on Numerical Calculation of Modal Characteristics of Pump-Turbine Shaft System

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