Results 21 to 30 of about 1,223,178 (264)

Fault Diagnosis Method for Transformer Winding Based on Differentiated M-Training Classification Optimized by White Shark Optimization Algorithm

Energies
Transformers, serving as critical components in power systems, are predominantly affected by winding faults that compromise their operational safety and reliability.
Guochao Qian, Kun Yang, Jin Hu, Hongwen Liu, Shun He, Dexu Zou, Weiju Dai, Haozhou Wang, Dongyang Wang   +8 more
doaj   +1 more source

Reproducing Transformers’ Frequency Response from Finite Element Method (FEM) Simulation and Parameters Optimization

Energies, 2023
Frequency response analysis (FRA) is being employed worldwide as one of the main methods for the internal condition assessment of transformers due to its capability of detecting mechanical changes.
Regelii Suassuna de Andrade Ferreira, Patrick Picher, Fethi Meghnefi, Issouf Fofana, Hassan Ezzaidi, Christophe Volat, Vahid Behjat   +6 more
doaj   +1 more source

Frequency Domain Response of Jacket Platforms under Random Wave Loads

Journal of Marine Science and Engineering, 2019
This article presents a procedure that simplifies an offshore jacket platform as a non-uniform cantilever beam subjected to an axial force. A Ritz method combined with a pseudo-excitation method is then used to analyze the responses of the jacket ...
Xiaoshuang Han, Weiliang Qiao, Bo Zhou
doaj   +1 more source

Frequency regulation method assisted by energy storage based on frequency response characteristics

电力工程技术
The increase of new energy permeability increases the complexity of power system frequency control. Frequency regulation assisted by energy storage can alleviate this problem to some extent. However, due to the security and economic constraints of energy
ZHAO Xilin, LI Pin, FU Bo
doaj   +1 more source

MIMO LS-SVR-Based Multi-Point Vibration Response Prediction in the Frequency Domain

Applied Sciences, 2020
To predict the multi-point vibration response in the frequency domain when the uncorrelated multi-source loads are unknown, a data-driven and multi-input multi-output least squares support vector regression (MIMO LS-SVR)-based method in the frequency ...
Cheng Wang, Delei Chen, Haiyang Huang, Wei Zhan, Xiongming Lai, Jianwei Chen   +5 more
doaj   +1 more source

Vibration Response of Soil under Low-Frequency Vibration Using the Discrete Element Method

Agriculture, 2023
The vibration response of soil is a key property in the field of agricultural soil tillage. Vibration components of tillage machinery are generally used to reduce tillage resistance and improve work efficiency, and the pressure variation under low ...
Lipengcheng Wan, Yonglei Li, Jinyu Song, Xiang Ma, Xiangqian Dong, Chao Zhang, Jiannong Song   +6 more
doaj   +1 more source

Serum Myonectin Levels Are Positively Associated With Physical Function and Lower Frailty‐Related Limitation in Maintenance Hemodialysis Patients: A Cross‐Sectional Study

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Maintenance hemodialysis (MHD) patients frequently suffer from frailty, characterized by reduced physical function and poor prognosis. Myokines, such as myonectin, secreted by muscle, are emerging regulators of systemic health. This study investigated the relationship between serum myonectin, adipokines (adiponectin, omentin), and ...
Kenichi Kono, Yoshifumi Moriyama, Koji Ohashi, Naoya Otaka, Minako Tatsumi, Toyoaki Murohara, Noriyuki Ouchi, Satoru Oshima   +7 more
wiley   +1 more source

Frequency Support from a Variable-Speed Wind Turbine Generator Using Different Variable Droop Characteristics

Energies, 2020
Doubly-fed induction generators (DFIGs) are capable of boosting frequency response capability while preventing the rotor speed from stalling during under-frequency disturbances, by employing variable droop characteristics. However, the frequency response
Dejian Yang, Jingjiao Li, Xinsong Zhang, Liang Hua   +3 more
doaj   +1 more source

Comparative Evaluation of Hemodiafiltration, Hemoperfusion, and Standard Hemodialysis on Efficacy, Inflammatory Control, Dialysis Adequacy, and Safety in End‐Stage Renal Disease: A Prospective Observational Study

Therapeutic Apheresis and Dialysis, EarlyView.
ABSTRACT Background Chronic micro‐inflammation in patients with end‐stage renal disease (ESRD) is a significant driver of cardiovascular complications and diminished quality of life. While standard hemodialysis (SHD) effectively manages small‐molecule clearance, its ability to remove medium‐to‐large uremic toxins—the primary catalysts of systemic ...
Hongwei Zuo, Weisi Dai, Jie Mao, Mei Ye, Xingshan Lu, Xiaocui Zhang   +5 more
wiley   +1 more source

Implementation of the SFRA method as valuable tool for detection of power transformer active part deformation [PDF]

Tehnika, 2014
The paper presents the SFRA (Sweep Frequency Response Analysis-SFRA) method for analyzing frequency response of transformer windings in order to identify potential defects in the geometry of the core and winding. The most frequent problems (recognized by
Milić Saša D., Ilić Denis M.
doaj   +1 more source