A method for analysis of head cover deformation and vibration amplitude in Francis hydro-turbine system by combination of CFD and FEA

Jia, Yun; Li, Feng‐Chen; Wei, Xianzhu; Li, Xiaobin; Li, Zhihe

doi:10.1007/s12206-017-0824-7

Cited by 8 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the asymmetric characteristics of the head-cover, the deformation and the stress of each head-cover bolt under the hydraulic pressure load vary greatly, and some bolts may have excessive stress concentration. The turbine start-up transient process is a very challenging operation condition for the units and is a major fatigue damage contributor for the turbine unit [17][18][19][20][21][22][23][24]. The hydraulic forces acting on the head-cover can cause high stresses and even damage on the head-cover bolts, and the alternating excessive stress during transient processes can reduce the remaining service life of the head-cover bolts and even lead to a serious accident.…”

Section: Introductionmentioning

confidence: 99%

Research on the Flow-Induced Stress Characteristics of Head-Cover Bolts of a Pump-Turbine during Turbine Start-Up

Wang

Yang²,

Wang

et al. 2022

Energies

View full text Add to dashboard Cite

Nowadays, pump-turbine units have to experience multiple start-stops every day to balance the power production and consumption on the grid. During the transient process of turbine start-up, the hydraulic forces applied to the head-cover would change dramatically and induce high-level stresses on the head-cover bolts. As key components of large hydraulic turbine units, the head-cover bolts are subjected to tens of thousands of tonnes of hydraulic excitation force during operation. Special attention should be paid to the design of the head-cover bolts of large hydraulic pump-turbine units because these units have high water heads and high hydraulic excitation forces. Therefore, the safe design of the head-cover bolts is extremely important to maintain the operational safety of the whole unit. This paper investigates the flow-induced stress characteristics of the head-cover bolts during turbine start-up in a large prototype pump-turbine unit. A complete 3D fluid model and a corresponding 3D structural model, including the head-cover bolts of the pump-turbine unit, were created. The fluid–structure coupling method was used to calculate the structural stresses caused by fluid flow during turbine start-up. The pressure files during turbine start-up calculated by the CFD tool were transferred and mapped to the finite element model of the structural components of the pump-turbine unit. Subsequently, the flow-induced stress characteristics of the head-cover bolts were numerically simulated. The simulation results showed that the hydraulic excitation force on the head-cover bolts increased significantly during turbine start-up, and the displacement and the stress distributions of different head-cover bolts were not uniform. The calculation methods and conclusions in this paper can also be applied to evaluate the flow-induced stress characteristics of head-cover bolts for similar hydraulic pump-turbine units.

show abstract

Section: Introductionmentioning

confidence: 99%

Research on the Flow-Induced Stress Characteristics of Head-Cover Bolts of a Pump-Turbine during Turbine Start-Up

Wang

Yang²,

Wang

et al. 2022

Energies

View full text Add to dashboard Cite

show abstract

“…Several structural optimization analysis methods have been applied for structure vibration control, for example, a structural parameter adjustment method (Ivanov et al, 2017), an optimization method based on genetic algorithm-back propagation neural networks (Peng, 2017), a single degree of freedom model with equivalent parameters (Lee and Lin, 2017), and the establishment of a dynamic vibration-absorbing structure (Qin et al, 2018). In addition, structural modal analysis for the identification of modal parameters (Salehi et al, 2018) and the finite-element analysis method (Yang, et al, 2016;Jia et al, 2017) have been used to estimate the natural frequency and parameter adjustment of the structure and have been shown to be useful for abnormal vibration control of the steering system structure. Ç ankaya et al (2016) have performed finite-element analysis of a steering system and have proposed structural parameter combination adjustment and parameter adjustment to reduce vibrations.…”

Section: Introductionmentioning

confidence: 99%

Vibration control analysis of vehicle steering system based on combination of finite-element analysis and modal testing

Tang

Ye³

et al. 2019

Journal of Vibration and Control

View full text Add to dashboard Cite

Determining the natural frequency distribution is of great importance in studying the vibration of the steering system in a commercial vehicle. A high-speed vibration frequency sweep experiment on an unladen commercial vehicle was conducted to determine the resonance frequency of the vehicle components. A vibration waterfall plot of the collected vibration data revealed that the cause of the vibration was frequency coupling resonance between the steering wheel vibration frequency and the second-order rotation frequency of the tire. Thus, a combined optimization of the structure of the rigid bearing parts of the steering fixed support and the steering column structure was proposed. A combination of finite-element analysis and modal testing method was undertaken to verify the effectiveness of the proposed combined structural improvement; the results demonstrated the consistency of the combined methods and showed that the natural frequency of the improved steering structures, together with the vibration amplitude, had changed. This study demonstrated the feasibility of the combined modal testing and finite-element analysis method, provided more information on the vibration transfer characteristics related to the vehicle subsystems, and provided a reference for the structural design of steering systems with reduced vibration.

show abstract

Stress Characteristics Analysis of Key Stationary Structural Components of Pump-Turbine Units Under Extreme Conditions

Xiao,

Zhang,

Huang

et al. 2024

Mechanisms and Machine Science

View full text Add to dashboard Cite

A method for analysis of head cover deformation and vibration amplitude in Francis hydro-turbine system by combination of CFD and FEA

Cited by 8 publications

References 7 publications

Research on the Flow-Induced Stress Characteristics of Head-Cover Bolts of a Pump-Turbine during Turbine Start-Up

Research on the Flow-Induced Stress Characteristics of Head-Cover Bolts of a Pump-Turbine during Turbine Start-Up

Vibration control analysis of vehicle steering system based on combination of finite-element analysis and modal testing

Stress Characteristics Analysis of Key Stationary Structural Components of Pump-Turbine Units Under Extreme Conditions

Contact Info

Product

Resources

About