Results 151 to 160 of about 824,135 (227)

Effect of blade curve shape on the hydraulic performance and pressure pulsation of a pump as turbine

The Physics of Fluids, 2022
As an economical and convenient device, a pump as turbine (PAT) is widely preferred in the energy recovery process and micro-hydropower plants. To study the operational stability of a PAT, a forward-curved impeller and a back-curved impeller were ...
Ru Xiang, Tao Wang, Yujian Fang, He Yu, Mingle Zhou, Xiang Zhang   +5 more
semanticscholar   +1 more source

Global fast terminal sliding mode controller for hydraulic turbine regulating system with actuator dead zone

Journal of the Franklin Institute, 2019
This paper investigates the frequency change problem of hydraulic turbine regulating system based on terminal sliding mode control method. By introducing a novel terminal sliding mode surface, a global fast terminal sliding mode controller is designed ...
Zhihuan Chen, Xiaohui Yuan, Xiaotao Wu, Yanbin Yuan, Xiaohui Lei   +4 more
semanticscholar   +1 more source

Parameter estimation of fuzzy sliding mode controller for hydraulic turbine regulating system based on HICA algorithm

Renewable Energy, 2019
Global hydropower growth continues to increase with a relative higher rate of total installed capacity in just last 10 years. This expansion means that it is increasingly important to make a further research with respect to various hydropower stations ...
Zhihuan Chen, Xiaohui Yuan, Yanbin Yuan, Xiaohui Lei, Binqiao Zhang   +4 more
semanticscholar   +1 more source

Nonlinear modeling and multi-scale damping characteristics of hydro-turbine regulation systems under complex variable hydraulic and electrical network structures

Applied Energy, 2021
In hydropower dominated power systems, low-frequency oscillations (LFO), that challenge the safe and stable operation of the system, occur from time to time.
Dong Liu, Chaoshun Li, O. Malik
semanticscholar   +1 more source

Numerical simulation and experimental investigation on the influence of the clocking effect on the hydraulic performance of the centrifugal pump as turbine

Renewable Energy, 2021
With the increasing attention to small hydropower, research on improving the hydraulic performance of the pump as turbine (PAT) has become more important.
Hongyu Guan, Jiang Wei, Yuchuan Wang, Tian Hui, Li Ting, Dingwei Chen   +5 more
semanticscholar   +1 more source

Priority analysis for risk factors of equipment in a hydraulic turbine generator unit

Journal of Loss Prevention in the Process Industries, 2019
Ensuring the safe operation of hydropower stations is one of the key challenges for electric generation. Clearly the safe operation of such systems can only be archived with proper and effective maintenance scheduling.
Beibei Xu, Diyi Chen, Huanhuan Li, Keyun Zhuang, Xiao Hu, Jinwei Li, H. Skjelbred, J. Kong, E. Patelli   +8 more
semanticscholar   +1 more source

Modeling and Simulation of Hydraulic Wind Turbine

Applied Mechanics and Materials, 2012
The wind energy can be transferred through an intermediate medium such as hydraulic fluids. In this paper a hydraulic system is utilized to transfer the wind energy from a wind turbine to a synchronous generator. A close loop hydraulic transfer system with fixed displacement pump and variable displacement motor is introduced and the mathematical model ...
Zhang, Yin, Kong, Xiang Dong, Ai, Chao, Cai, Wenjian   +3 more
openaire   +2 more sources

Hydraulic Turbine Contra-Angle Handpiece

The Journal of the American Dental Association, 1953
A high rotary speed enhances the effi­ ciency of instruments used for cutting teeth in operative procedures. The small diameters of the dental cutting tools make it necessary to turn the instru­ ments at high rates of speed in order to obtain effective linear speeds for the re­ moval of enamel.
R J, NELSEN, C E, PELANDER, J W, KUMPULA
openaire   +2 more sources

Numerical Simulation of Solid-Liquid Two-Phase Flow and Wear Prediction of a Hydraulic Turbine High Sediment Content

Experimental techniques (Westport, Conn.), 2022
Wei Zhou, J. Chai, Z. Xu, C. Cao, G. Wu, X. Yao   +5 more
semanticscholar   +1 more source

Damping Analysis and Parameter Adjustment of Hydraulic Turbine Governor under Ultra-low Frequency Oscillation

2019 IEEE 3rd Conference on Energy Internet and Energy System Integration (EI2), 2019
This paper analyzes the damping effect of hydraulic turbine governor on ultra-low frequency oscillation (ULFO) based on damping torque analysis, comparing the damping of different operating modes of the governor.
Liang Cheng, Weiyuan Wang, Guang Xu, F. Dou, Xuelian Wu, Jinmin Cheng   +5 more
semanticscholar   +1 more source