Results 31 to 40 of about 55,867 (251)

An Active Common-Mode Voltage Canceler for PWM Converters in Wind-Turbine Doubly-Fed Induction Generators

Energies, 2019
Wind energy integration in power grids is increasing day by day to reduce the use of fossil fuels, and consequently greenhouse gas emissions. Using the pulse-width modulated (PWM) power converters in wind turbine generators, specifically in doubly-fed ...
Amr. S. Zalhaf, Mazen Abdel-Salam, Mahmoud Ahmed   +2 more
doaj   +1 more source

Venous Thromboembolism in Pediatric Bone Sarcoma Patients: A 10‐Year, Single‐Institution Experience Encompassing the COVID‐19 Pandemic

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Osteosarcoma (OS) and Ewing sarcoma (EWS) are the most common primary bone cancers in children, but acute thrombosis is poorly characterized in this population. Our study evaluated the rates of venous thromboembolism (VTE) and associated risk factors in pediatric patients with bone sarcomas treated over a 10‐year period encompassing
Sarah Kappa, Shou Xu, Mark Zobeck, Sarah E. Sartain, Nino Rainusso, Lisa Wang, Nicole Montgomery, Paige Wheaton, Sarah Whittle   +8 more
wiley   +1 more source

Common mode voltage impact on wind turbine main shaft bearing

, 2021
Main shaft bearing is a critical component in the wind turbine rotating system. But the bearing voltage, which is generated by the potential differences between the bearing and the main shaft, often causes the downtime of the main shaft bearing.
Carlson, Ola, Zhao, Jian, Xu, Xiangdong
core  

Detection and Diagnosis of Motor Stator Faults using Electric Signals from Variable Speed Drives [PDF]

, 2015
Motor current signature analysis has been investigated widely for diagnosing faults of induction motors. However, most of these studies are based on open loop drives.
Shaeboub, Abdulkarim, Gu, Fengshou, Hu, Niaoqing, Ball, Andrew, Fengshou Gu, Samieh Abusaad, Andrew D. Ball, Niaoqing Hu, Abusaad, Samieh, Abdulkarim Shaeboub   +9 more
core   +1 more source

Research on key technologies of bearing preload of spindle based on piezoelectric actuators

The Journal of Engineering, 2019
This study analysed the influence of bearing preload on the stiffness of spindle bearings. MATLAB/Simulink is used to calculate the vibration of simplified spindle system.
Junping Zhang, Chuang Zuo, Rongjun Ye
doaj   +1 more source

Heterogeneity in the Global Practice of Central Nervous System Staging in Pediatric Acute Lymphoblastic Leukemia

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Central nervous system (CNS) involvement in childhood acute lymphoblastic leukemia (ALL) is assessed by cell counting and cytomorphology from cerebrospinal fluid (CSF) and is used for treatment stratification worldwide. The ratio of “CNS2” patients in clinical trials ranges from 3% to 40%, with unclear prognostic significance ...
Laura Almási, Bernadett Borbála Huszti, Gábor Barna, Marko Kavcic, Janez Jazbec, Lennart Lenk, Vera Münch, Sophia Polychronopoulou, Ágnes Márk, Maria Thastrup, Lüder H. Meyer, Kjeld Schmiegelow, Cornelia Eckert, Christina Halsey, Dániel J. Erdélyi   +14 more
wiley   +1 more source

Rotors on Active Magnetic Bearings: Modeling and Control Techniques [PDF]

, 2012
In the last decades the deeper and more detailed understanding of rotating machinery dynamic behavior facilitated the study and the design of several devices aiming at friction reduction, vibration damping and control, rotational speed increase and ...
Tonoli, Andrea, Andrea Tonoli, Bonfitto, Angelo, Lester D., Angelo Bonfitto, SUAREZ CABRERA, LESTER DANIEL, Silvagni, Mario, Mario Silvagni, Suarez, L.D.   +8 more
core   +1 more source

Analysis of Traction Motor Bearing Voltage and Bearing Current Considering Whole-train Grounding and Suppression Measures

Chengshi guidao jiaotong yanjiu
Objective Most urban rail transit trains use PWM (pulse width modulation) variable frequency drive system, which often leads to bearing corrosion problems due to the excessive bearing voltage and bearing current during operation.
CHEN Zhi, ZHAO Wenjuan, YANG Xiangyan, CHEN Zhiwen, YANG Shaobing, SONG Kejian   +5 more
doaj   +1 more source

An experimental attempt at measurement of bearing load in deep groove ball bearing with eddy current method

Nihon Kikai Gakkai ronbunshu, 2019
Eddy current method which is uninfluenced by oil film rupture or viscosity change was employed as a simple in-situ estimation method of bearing load acting on deep groove ball bearing operating under low rotational speed.
Akitoshi TAKEUCHI
doaj   +1 more source

Simulation Analysis of Multi-Physical Field Coupling and Parameter Optimization of ECM Miniature Bearing Outer Ring Based on the Gas-Liquid Two-Phase Turbulent Flow Model

Micromachines, 2022
Electrochemical machining (ECM) is an essential method for machining miniature bearing outer rings on the high-temperature-resistant nickel-based alloy GH4169. However, the influence of electrolyte temperature distribution and bubble rate distribution on
Zhaolong Li, Wangwang Li, Bingren Cao
doaj   +1 more source