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Jiawei Ye, Wei Zeng, Zhigao Zhao, Jiebin Yang and Jiandong Yang
In load rejection transitional processes in pumped-storage plants (PSPs), the process of closing pump turbines, including guide vane (GVCS) and ball valve closing schemes (BVCS), is crucial for controlling pulsating pressures and water hammer. Extreme pr...
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Jiandong Yang, Huang Wang, Wencheng Guo, Weijia Yang and Wei Zeng
Hydroelectric power plants? open-type surge tanks may be built in mountains subject to the provision of atmospheric air. Hence, a ventilation tunnel is indispensable. The air flow in the ventilation tunnel is associated with the fluctuation of water-leve...
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Weijia Yang, Jiandong Yang, Wencheng Guo, Wei Zeng, Chao Wang, Linn Saarinen and Per Norrlund
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Weijia Yang, Jiandong Yang, Wencheng Guo, Wei Zeng, Chao Wang, Linn Saarinen and Per Norrlund
This paper presents a mathematical model of hydro power units, especially the governor system model for different operating conditions, based on the basic version of the software TOPSYS. The mathematical model consists of eight turbine equations, one gen...
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Wei Zeng, Chao Wang and Jiandong Yang
Hydraulic systems may involve both pipelines and open channels, which challenges the hydraulic transient analysis. In this paper, a method of characteristics (MOC)-finite volume method (FVM) coupling method has been developed with the pipeline modelled u...
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Jiandong Ran, Ke Xiong, Mei Dou, Huizhi Zhong, Ya Feng, Mingfang Tang and Zhenjing Yang
Solar heat gain and natural ventilation cooling of the indoor environment in buildings are highly influenced by the shading and openable area of windows. In addition to the ambient condition, the Heating, ventilation and air conditioning (HVAC) system?s ...
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Hong Yang, Zehan Ruan, Wenshu Li, Huanjie Zhu, Jie Zhao and Jiandong Peng
This study used metro smart-card data from Wuhan, China, and explored the impact of the built environment on the metro ridership and station travel distance of elderly people using geographically weighted regression (GWR). First, our results show that el...
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Jiandong Peng, Changwei Cui, Jiajie Qi, Zehan Ruan, Qi Dai and Hong Yang
The expansion of the rail transit network has a positive impact on travel characteristics under spatial and temporal constraints by changing accessibility. However, few empirical studies have examined the longitudinal evolution of the impact of accessibi...
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Jiandong Duan, Fan Liu, Yao Yang and Zhuanting Jin
Aiming at the problem of insufficient flexibility of the power system caused by large-scale wind power grid integration, a flexible economic dispatch model of the electricity-gas integrated system that considers power-to-gas and demand responses is propo...
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Ende Wang, Jinlei Jiao, Jingchao Yang, Dongyi Liang and Jiandong Tian
Keypoint matching is of fundamental importance in computer vision applications. Fish-eye lenses are convenient in such applications that involve a very wide angle of view. However, their use has been limited by the lack of an effective matching algorithm...
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Chao Wang, Jiandong Yang and Håkan Nilsson
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Chao Wang, Jiandong Yang and Håkan Nilsson
A model for simulating vertical water level fluctuations with coupled liquid and gas phases is presented. The Preissmann implicit scheme is used to linearize the governing equations for one-dimensional transient flow for both liquid and gas phases, and t...
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Jiandong Yang, Mingjiang Wang, Chao Wang and Wencheng Guo
On the basis of the state?space method (SSM), a novel linear mathematical model of the unsteady flow for the tailrace system with an open channel is proposed. This novel model is an elastic linearized model of water hammer. The validity of the model has ...
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Kejing Yang, Lingdong Kong, Songying Tong, Jiandong Shen, Lu Chen, Shengyan Jin, Chao Wang, Fei Sha and Lin Wang
In recent years, high fine particulate (PM2.5) pollution episodes with high ozone (O3) levels have been observed in Shanghai from time to time. However, their occurrence and characteristics remain poorly understood. Meanwhile, as a major precursor of tro...
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