Article
Engineering, Electrical & Electronic
Yi Li, Qiuyuan Xu, Yanfeng Lu
Summary: This research uses finite element software to analyze the electromagnetic forces of a 50000 KVA/110 KV three phase power transformer, proposing a novel method that considers short-circuit impedance to simulate winding deformation, testing the electromagnetic forces with short-circuit current, and providing significant insights for evaluating the winding deformation state.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Chemistry, Physical
Cheng Liu, Jingtao Han, Ruilong Lu, Jiawei Liu, Xiaoyan Ma
Summary: A numerical simulation and experimental study were conducted on the ultrasonic induction heating process of Ti6Al4V alloy tubes. It was found that increasing the current frequency and current value improves the heating effect and reduces the temperature difference between the interior and exterior of the tube. The simulation results were validated experimentally, demonstrating the feasibility of using numerical simulation to monitor the temperature distribution during the induction heating process.
Article
Energy & Fuels
Zhenyu Cai, Chuanyang Zha, Ruopu Zhan, Gang Huang
Summary: This paper conducts a systematic simulation study on the magnetization and loss characteristics of nanocrystalline transformers under different excitations, and analyzes the distribution of magnetic flux density and core loss characteristics.
Article
Thermodynamics
Shu Wang, Qi Wang, Ruirun Chen, Yinling Jin, Dezhi Chen, Liang Wang, Yanqing Su, Jingjie Guo, Hengzhi Fu
Summary: In this study, the influence of temperature gradient and boundary conditions on the shape of the solid-liquid (S-L) interface in electromagnetic cold crucible directional solidification (CCDS) was analyzed using Comsol Multiphysics software. The simulation results showed that the S-L interface formed by 50kHz-2400A was closer to a plane shape and was beneficial for achieving directional grain.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Multidisciplinary Sciences
Chander Parkash, Ali Reza Abbasi
Summary: Transformer defects can be identified using frequency response analysis (FRA), but interpreting the results is still a research area. This study proposes a new hyperbolic fuzzy cross entropy (FCE) measure to improve the interpretation accuracy and classification of winding faults. By applying this method, FRA signatures can be smartly interpreted and winding faults can be accurately classified in the desired frequency ranges.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Electrical & Electronic
Federica Bragone, Kateryna Morozovska, Patrik Hilber, Tor Laneryd, Michele Luvisotto
Summary: This paper focuses on the thermal modelling of power transformers using physics-informed neural networks (PINNs). The PDE considered for the study is the heat diffusion equation provided with boundary conditions, and the estimated top-oil temperature and the transformer's temperature distribution show high accuracy and consistency with the Finite Volume Method (FVM) solutions.
ELECTRIC POWER SYSTEMS RESEARCH
(2022)
Article
Acoustics
Xuhong Miao, Pei Jiang, Fuzhen Pang, Yang Tang, Haichao Li, Guanglei Qu, Jun Li
Summary: This paper establishes an electromagnetic-mechanical-acoustic coupled three-dimensional finite element method for oil-immersed transformers, and explores the influences of radiating grids and input voltage on their vibration and noise characteristics. The study proves the effectiveness of the calculation model and quantitatively analyzes the effects of different factors.
Article
Chemistry, Analytical
Kyohei Yada, Takashi Shimojo, Hideyuki Okada, Atsushi Sakurai
Summary: This study theoretically and numerically analyzes a wavelength-selective emitter using a graphene ribbon metasurface, achieving high-quality and actively controllable emission. The proposed emitter causes impedance matching in a narrow wavelength range due to the controllable conductivity of graphene, demonstrating potential for various optical devices.
Article
Engineering, Marine
Kazem Shahverdi, Reyhaneh Loni, J. M. Maestre, Gholamhassan Najafi
Summary: This study uses Computational Fluid Dynamics (CFD) to evaluate the performance of Archimedes Screw Turbines (ASTs), validates the numerical model, and analyzes how mechanical torque and efficiency change with different parameters. The results show that CFD is a reliable tool for studying the behavior of ASTs.
Article
Engineering, Electrical & Electronic
Huan Zhang, Shuo Wang
Summary: This article develops magnetic dipole moment models based on Maxwell's equations for evaluation and reduction of the near magnetic field of inductors in power electronics systems. The developed model considers the magnetic dipole moments from the winding and the air gaps as the near magnetic field source of an inductor. The superposition of these magnetic dipole moments determines the near magnetic field. The developed model can be easily applied to different configurations of inductors with various winding and air gap arrangements for assessing and reducing the near magnetic field. Simulations and experiments are conducted to validate the developed theory.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Jing Yu, Shuai Zhang, Yanchuan Liu, Jinlong Wang
Summary: The study investigated a stepwise induction cladding process using simulations and experiments, applying three types of alloy powders onto a grey cast-iron substrate. A coupled electromagnetic and heat transfer model helped analyze the process, revealing the roles of eddy currents and Joule heating. The simulation results provided insights into the metallurgical bonding process of the alloyed coating, which was challenging to observe experimentally.
MATERIALS RESEARCH EXPRESS
(2021)
Article
Energy & Fuels
Umer Ehsan, Muhammad Jawad, Umar Javed, Khurram Shabih Zaidi, Ateeq Ur Rehman, Anton Rassolkin, Maha M. Althobaiti, Habib Hamam, Muhammad Shafiq
Summary: The paper aims to provide a step-by-step comprehensive procedural guideline for practical implementation of relay testing procedures and a detailed insight analysis of relay settings. The experimental results are scrutinized to document a detailed theoretical and technical analysis. Additionally, the paper covers shortcomings of existing literature by documenting specialized literature that covers all aspects of protection relays.
Article
Thermodynamics
Mohamed Fterich, Houssam Chouikhi, Sadoth Sandoval-Torres, Hatem Bentaher, Ahmed Elloumi, Aref Maalej
Summary: PV/T systems are a new technology for generating both electricity and thermal energy simultaneously. An experimental device using aluminum square tubes to enhance electrical efficiency was presented in this study. Analysis and simulations were conducted to predict heat transfer and temperature distribution, showing that high airflow experiment resulted in higher thermal efficiency. Outlet air temperature at high airflow could be used for drying process.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Cailing Huo, Youhua Wang, Chengcheng Liu, Gang Lei
Summary: This study proposes a residual flux density measurement method for power transformer cores based on magnetising inductance, which is verified through experiments and shown to have higher accuracy compared to widely used voltage integration methods.
IET ELECTRIC POWER APPLICATIONS
(2022)
Article
Computer Science, Information Systems
Michael Prantner, Nejila Parspour
Summary: This paper analyzes and optimizes the heating power of implanted devices in minimally invasive thermal ablation procedures. The study focuses on the selection of optimal implanted coils based on spatial, electrical, and magnetic parameters. The research finds that maximizing the ratio of heating power to required magnetic field strength reduces the risk of unwanted heating and enhances the safety and well-being of patients.
Article
Materials Science, Multidisciplinary
Lucian Pislaru-Danescu, Elena Chitanu, Lucia-Andreea El-Leathey, Virgil Marinescu, Dorian Marin, Beatrice-Gabriela Sbarcea
ELECTRONIC MATERIALS LETTERS
(2018)
Article
Engineering, Electrical & Electronic
Lucian Pislaru-Danescu, Alexandru M. Morega, Jean Bogdan Dumitru, Mihaela Morega, Nicolae Calin Popa, Floriana D. Stoian, Daniela Susan-Resiga, Sorin Holotescu, Marius Popa
IEEE TRANSACTIONS ON MAGNETICS
(2018)
Article
Chemistry, Multidisciplinary
Gabriela Telipan, Lucian Pislaru-Danescu, Eduard-Marius Lungulescu, Ioana Ion, Virgil Marinescu
Summary: This study developed three types of dry polarizable electric bioimpedance sensors for skin bioimpedance monitoring without skin preparation. The sensors utilized conductive polypyrrole and hybrid nanocomposite polypyrrole-Ag as sensitive materials, and were characterized by various analytical techniques. The sensors demonstrated good bioimpedance performance across a frequency range and showed linear impedance-frequency curves in the frequency range of interest.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Mechanical
Lucian Pislaru-Danescu, Alexandru-Mihail Morega, Rares-Andrei Chihaia, Ionel Popescu, Mihaela Morega, Lica Flore, Marius Popa, Eros-Alexandru Patroi
Summary: This paper discusses the innovative technical solutions required for using a linear magnetostrictive motor in outer space, along with the resulting significant construction changes. The study employs a bias coil and PWM power sources to control the two coils of the LMM, reducing Joule losses and providing cooling with three Peltier elements.
Article
Chemistry, Analytical
Lucian Pislaru-Danescu, George-Claudiu Zarnescu, Gabriela Telipan, Victor Stoica
Summary: The purpose of this study was to highlight a method of making equipment for the investigation of low frequency bioimpedance. A constant current is injected into the human body, and the biological signal is extracted from the electrodes for analysis. The system is designed to minimize interference and ensure accurate measurements. The results obtained are consistent with previous studies.
Article
Engineering, Mechanical
Lucian Pislaru-Danescu, George-Claudiu Zarnescu, Eros-Alexandru Patroi, Rares-Andrei Chihaia, Gabriela Telipan
Summary: A microactuation process was developed using four coils to generate a pulsatory rotating magnetic field. A small actuator stator with an ABS opened box and E-type ferrite cores was constructed. Simulations and experiments showed that the Duty Cycle should be limited to 0.7 to avoid magnetic nanofluid saturation at 45 mT. The process has applications in small motors, small flat pumps, and manipulating sheet matrix for displays or chemical droplets mixing.
Article
Chemistry, Analytical
George-Claudiu Zarnescu, Lucian Pislaru-Danescu, Athanasios Tiliakos
Summary: A modular electromagnetic transducer that optimizes energy transfer from electric and/or magnetic fields is proposed in this paper. Consideration is given to both magnetic field resonance coupling and the influence of the electric field. Experimental results demonstrate increased energy transfer efficiency when using both electric and magnetic fields. New formulas for estimating the near-field region and the self-capacitance of the RF transformer coil are proposed.
Article
Engineering, Electrical & Electronic
Yelda Veli, Alexandru M. Morega, Lucian Pislaru-Danescu, Mihaela Morega
Summary: The paper discusses the numerical analysis of two designs of planar, miniature flyback transformers powered by a PWM voltage supply at high frequency. One design uses a nonmagnetic medium in the magnetic circuit, while the other design uses a magnetic nanofluid. The study includes varying the air gap in the ferrite core's central column for enhancing stored magnetic energy, accompanied by thermal analysis.
UNIVERSITY POLITEHNICA OF BUCHAREST SCIENTIFIC BULLETIN SERIES C-ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
(2021)
Proceedings Paper
Engineering, Electrical & Electronic
G. Telipan, L. Pislaru-Danescu, I. Ion, V Marinescu
CAS 2020 PROCEEDINGS: 2020 INTERNATIONAL SEMICONDUCTOR CONFERENCE
(2020)
Article
Engineering, Electrical & Electronic
Yelda Veli, Alexandru-Mihail Morega, Lucian Pislaru-Danescu, Mihaela Morega
REVUE ROUMAINE DES SCIENCES TECHNIQUES-SERIE ELECTROTECHNIQUE ET ENERGETIQUE
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
Yelda Veli, Alexandru M. Morega, Lucian Pislaru-Danescu, Mihaela Morega, Gabriela Telipan
2019 11TH INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING (ATEE)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
L. Pislaru-Danescu, A. M. Morega, M. Morega, A. A. Dobre
2019 11TH INTERNATIONAL SYMPOSIUM ON ADVANCED TOPICS IN ELECTRICAL ENGINEERING (ATEE)
(2019)
Proceedings Paper
Engineering, Electrical & Electronic
Yelda Veli, Alexandru M. Morega, Lucian Pislaru-Danescu, Mihaela Morega
2018 INTERNATIONAL CONFERENCE ON APPLIED AND THEORETICAL ELECTRICITY (ICATE)
(2018)
Article
Multidisciplinary Sciences
Alexandra M. Morega, Juan Ordonez, Mihaela Morega, Lucian Pislaru-Danescu, Alin A. Dobre
PROCEEDINGS OF THE ROMANIAN ACADEMY SERIES A-MATHEMATICS PHYSICS TECHNICAL SCIENCES INFORMATION SCIENCE
(2018)
