Results 61 to 70 of about 1,570 (213)

Performance Prediction of Centrifugal Norm Pumps Operating as Turbines

Fluids
Pump-as-turbines (PAT) has been widely used during the last decade as one of the most interesting technologies in the field of energy recovery. Many studies and papers have been published in which the performance of the pumps in the turbine operating ...
Jasmina Bogdanović-Jovanović, Živojin Stamenković, Miloš Kocić, Jelena Petrović   +3 more
doaj   +1 more source

Energy Balance and Local Unsteady Loss Analysis of Flows in a Low Specific Speed Model Pump-Turbine in the Positive Slope Region on the Pump Performance Curve

Energies, 2019
The positive slope on the pump performance curve of pump-turbines suggests potential operational instabilities in pump mode. Previous research has indicated that the increase of the hydraulic loss caused by sudden changes of flow patterns in pump ...
Guocheng Lu, Zhigang Zuo, Demin Liu, Shuhong Liu   +3 more
doaj   +1 more source

Vibration Attenuation of Cantilever Beam Using Electromagnetic Delayed Feedback

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT This study presents a combined analytical and numerical investigation of a single‐input single‐output delayed feedback controller designed to suppress vibrations in a cantilever beam actuated by an electromagnet positioned beneath its free end. An analytical model was developed using the linearized equation of motion for a transversely excited
Mohammad Alabdullah, Khaled Alhazza
wiley   +1 more source

Adaptive Robust Control for Pump-Controlled Pitch Systems Facing Wind Speed and System Parameter Variability

Applied Sciences
This paper proposes an Adaptive Robust Control (ARC) strategy for pump-controlled pitch systems in large wind turbines to address challenges in control accuracy and energy efficiency.
Tiangui Zhang, Bo Yu, Xuewei Wang, Yinping Liu, Gexin Chen, Keyi Liu, Chao Ai, Lihui Wang   +7 more
doaj   +1 more source

Analysis of Mechanical‐Electrical‐Hydraulic Coupled Vibration Response Characteristics of Thermal Control Circulating Pumps Supported by Water‐Lubricated Bearings

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT The operational reliability of thermal control circulation pumps is significantly restricted by the multi‐physics coupled environment. To reveal the vibration transmission mechanisms and dynamic response characteristics under multi‐field coupled excitations, a multi‐DOF coupled dynamic representation of the overall system, incorporating the ...
Jianfeng Luo, Liukai Hou, Yutao Zou, Kaiyuan Hao, Guangwu Zhou   +4 more
wiley   +1 more source

Torsional Vibrations at Guide-Vane Shaft of Pump–Turbine Model

Shock and Vibration, 1997
This article focuses on the problem of guide-vane vibrations of reversible pump–turbines, especially, in the pump mode. These vibrations are transmitted to the guide-vane shaft torque. The guide-vane vibrations are caused by the impeller exit flow, which
Andrej Predin
doaj   +1 more source

‘We want to be the hosts of this story’: Learning from community‐led approaches to data governance of land use for nature recovery

People and Nature, EarlyView.
Abstract Debates abound regarding how to use land for nature recovery and environmental governance. Such decisions require an understanding of benefits and trade‐offs, and increasingly rely on vast quantities of data, delivered through digital technologies.
Lucy Jenner, Marc J. Metzger, Darren Moseley, Ed Forrest   +3 more
wiley   +1 more source

Limitations of Using DAQ Cards for Absolute Vibration Measurement in Hydraulic Machines

Applied Sciences
Vibration measurements are a frequently used tool in technical issues. They are widely used in operation and for testing irregularities in the operation of machines and devices, including hydraulic machines (turbines, pumps, and pump turbines).
Waldemar Janicki
doaj   +1 more source

Digital surveillance of animals and nature recovery

People and Nature, EarlyView.
Abstract Digital surveillance technologies (DSTs) are widely applied in nature recovery for their potential to generate novel data on species and ecosystems through digital tracking, automation (e.g. from hazardous locations) and from newly recruited citizen scientists.
William M. Adams
wiley   +1 more source

National Policy Coherence Counts for Reducing Inequality in Global Climate and Development Agendas

Sustainable Development, EarlyView.
ABSTRACT International institutions promote policy coherence as crucial to the effective and fair implementation of global sustainability agendas, though the evidence for its benefits is slim. We present here the first systematic cross‐country dataset on the consequences of national government efforts to promote policy coherence for vulnerable groups ...
Katherine Browne, Adis Dzebo, Zoha Shawoo, Mario Cardenas, Pierrick Chalaye, Alexia Faus Onbargi, Cassilde Muhoza, Patricia Nicdao, Nokwethaba Makhanya, Navam Niles, Priyatma Singh   +10 more
wiley   +1 more source