Results 1 to 10 of about 43,247 (165)

A Harmonic Impedance Identification Method of Traction Network Based on Data Evolution Mechanism

Energies, 2020
In railway electrification systems, the harmonic impedance of the traction network is of great value for avoiding harmonic resonance and electrical matching of impedance parameters between trains and traction networks.
Ruixuan Yang, Fulin Zhou, Kai Zhong
doaj   +3 more sources

Time–Frequency Respiratory Impedance Maps Enable Within-Breath Deep Learning for Small Airway Dysfunction Identification [PDF]

Bioengineering
Small airway dysfunction (SAD) is an early functional abnormality associated with multiple chronic airway diseases. However, clinical assessment often relies on spirometry-based indices, which require forced maneuvers and are sensitive to subject effort,
Dongfang Zhao, Sunxiaohe Li, Peng Wang, Pang Wu, Zhenfeng Li, Lidong Du, Xianxiang Chen, Ting Yang, Jingen Xia, Zhen Fang   +9 more
doaj   +2 more sources

Identification of Three-Phase Grid Impedance in the Presence of Parallel Converters

Energies, 2019
Grid impedance is an important parameter which affects the control performance of grid-connected power converters. Several methods already exist for optimizing the converter control system based on knowledge of grid impedance value.
Roni Luhtala, Tuomas Messo, Tomi Roinila, Henrik Alenius, Erik de Jong, Andrew Burstein, Alejandra Fabian   +6 more
doaj   +3 more sources

Topology and Impedance Identification Method of Low-Voltage Distribution Network Based on Smart Meter Measurements

Frontiers in Energy Research, 2022
In recent years, distributed photovoltaic facilities and distributed energy storage are widely connected to a low-voltage distribution network, which makes the topology of the low-voltage distribution network change faster, and the online identification ...
Li Tong, Weijian Chai, Dongqi Wu
doaj   +3 more sources

Modeling and control of a bedside cable-driven lower-limb rehabilitation robot for bedridden individuals

Frontiers in Bioengineering and Biotechnology, 2023
Individuals with acute neurological or limb-related disorders may be temporarily bedridden and unable to go to the physical therapy departments. The rehabilitation training of these patients in the ward can only be performed manually by therapists ...
Daoyu Wang, Jicai Li, Zhuo Jian, Hao Su, Hao Su, Hao Su, Hongbo Wang, Fanfu Fang   +7 more
doaj   +1 more source

Identification of Grid Impedance by Broadband Signals in Power Systems with High Harmonics

Energies, 2021
Grid impedance is an important parameter and is used to perform impedance-based stability analysis for the operation of grid-connected systems, such as power electronics-interfaced solar, wind and other distributed power generation systems.
Matthias Buchner, Krzysztof Rudion
doaj   +1 more source

An improved dq-frame wideband impedance identification method for power supply network with only one disturbance

Frontiers in Energy Research, 2023
To cope with the energy crisis and environmental degradation, the new energy represented by wind and photovoltaic power generations have developed rapidly, which leads to a large number of power electronic converters being connected to the power grid. In
Changjun Zhao, Kai Wei, Xing Yan, Haojin Lin   +3 more
doaj   +1 more source

Review of Local Network Impedance Estimation Techniques

IEEE Access, 2020
As a result of increasing variability of network impedance, interest in impedance estimation techniques is growing. This review contextualises local impedance estimation techniques by providing a historical prospective on the uses of these techniques ...
Mathieu Kervyn De Meerendre, Eduardo Prieto-Araujo, Khaled H. Ahmed, Oriol Gomis-Bellmunt, Lie Xu, Agusti Egea-Alvarez   +5 more
doaj   +1 more source

Experimental Evaluation of Miniature Impedance Board for Loosening Monitoring of the Threaded Pipe Connection

Frontiers in Physics, 2021
Electromechanical impedance (Electromechanical impedance)-based methods as potential nondestructive evaluation (NDT) techniques have been widely used in the field of structural health monitoring (SHM), especially for the civil, mechanical, and aerospace ...
Yabin Liang, Yabin Liang, Yabin Liang, Yabin Liang, Yixuan Chen, Yixuan Chen, Zuocai Zhang, Zuocai Zhang, Zuocai Zhang, Zuocai Zhang, Qian Feng, Qian Feng, Qian Feng, Qian Feng   +13 more
doaj   +1 more source

Identification of an inclusion in multifrequency electric impedance tomography [PDF]

Communications in Partial Differential Equations, 2016
The multifrequency electrical impedance tomography is considered in order to image a conductivity inclusion inside a homogeneous background medium by injecting one current. An original spectral decomposition of the solution of the forward conductivity problem is used to retrieve the Cauchy data corresponding to the extreme case of perfect conductor ...
Ammari, Habib, Triki, Faouzi
openaire   +3 more sources