A5101772895- Physics of Superconductivity and Magnetism
- Metal Forming Simulation Techniques
- Theoretical and Computational Physics
- Magnetic properties of thin films
- Advanced Condensed Matter Physics
- Metallurgy and Material Forming
- Superconducting Materials and Applications
- High-Velocity Impact and Material Behavior
- Electromagnetic Launch and Propulsion Technology
- Laser and Thermal Forming Techniques
- Magnetic and transport properties of perovskites and related materials
- Superconductivity in MgB2 and Alloys
- Magnetic Field Sensors Techniques
- Energy Load and Power Forecasting
- Power Transformer Diagnostics and Insulation
- Magnetic Bearings and Levitation Dynamics
- Power Quality and Harmonics
- Iron-based superconductors research
- Magnetic confinement fusion research
- Electric Motor Design and Analysis
- Power Systems Fault Detection
- High voltage insulation and dielectric phenomena
- Chemical and Physical Properties of Materials
- Graph Theory and Algorithms
- Induction Heating and Inverter Technology
China Three Gorges University
2015-2024
China Energy Engineering Corporation (China)
2023
Huazhong University of Science and Technology
2010-2018
Nanjing University
1987-2013
University of South China
2013
Collaborative Innovation Center of Advanced Microstructures
1997
National Laboratory of Solid State Microstructures
1997
Institute of Solid State Physics
1987
In the paper, effects of current frequency on electromagnetic sheet metal forming process are investigated using an efficient finite element model, which couples analysis circuit, electromagnetic, and mechanical equations. Based initial electrical structural parameters system, model calculates pulsed flowing through coil, consequent magnetic force acting sheet, finally generated deformation. The maximum displacement in axial direction analyzed for two sheets by changing capacitance capacitor...
At present, the cylindrical coil is used to generate electromagnetic force in tube expansion process. The obtained radial end of less than one middle for effects. Hence, deformation inhomogeneous axial direction. This paper presents a method named with concave obtain more homogeneous deformation. By using COMSOL software, it gives simulations effect geometry parameters on distribution and behavior given AA6063-T6 tube. Simulations show that suitable can Furthermore, range by 36 mm, which better coil.
Electromagnetic forming is widely used in processing of lightweight alloys and provides significant improvements the limits materials. However, coils are difficult to wind, which means that small tube bulge processes quite challenging because coil must be placed inside generate repulsive electromagnetic force required. To solve this problem, a novel method uses attraction for proposed. The special discharge circuit consists wide pulse power supply (2 MJ/25 kV/6400 μF) narrow (25 kJ/25 kV/80...
In this paper, an electromagnetic forming (EMF) system with energy of 200 kJ (25 kV, 640 μF) was designed and fabricated to flange a large-scale aluminum alloy sheet bore, whose outer diameter, bore thickness are mm, 180 5 respectively. The stress distribution the midplane coil calculated check structural strength. And multiphysics coupled finite element model, which involves coupling circuit, field, deformation thermal built assess capacity EMF system. Furthermore, experimental results...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> Coils for pulsed magnets in the range of 50–75 T are developed with optimized combinations conductors and reinforcement prototype laboratory Wuhan High Magnetic Field Center (WHMFC). The basic design tool is a Pulsed Magnet Design Software package (PMDS) calculating capacitor discharge, conductor heating, mechanical stresses residual stress, including plastic deformation winding tension. A 1 MJ...
In this article, electromagnetic bulging of high-strength, low-conductivity Ti-6Al-4V using a T3 copper driver plate at room temperature was described. The investigation conducted employing numerical simulation method. Numerical prediction the deformation contour and thickness distribution were closely correlated with experimental results. force on impact between workpiece varying time obtained. Besides, velocity strain rate determined by analyzing process. Energy efficiency process to be...
MgB2 bulk samples were synthesized by the usual solid-state reaction method. AC losses of sample measured using ac susceptibility system (ACS) in external dc magnetic fields up to 7 T. The dependence on temperature (T), frequency (f) and magnitude field (Bac) was experimentally obtained. A comparison is made between properties that high-Tc superconductor Ag-Bi2223 low-Tc NbTi. It found mechanism may still be same as superconductors can explained flux creep models.
Magnetic field measurement is one of the key contents in electromagnetic protection. In this paper, a magnetic system based on distributed sensing and high-accuracy numerical integration method proposed. And sensor with simple structure, small size, wide band designed, which includes three coils that can realize accurate three-dimensional field. The output coil differential signal needs to be reduced by integrator. To solve problems traditional analog integrator common digital integrator,...
The accuracy of voltage transformer (VT) measurements is imperative for the security and reliability power systems equitability energy transactions. integration a substantial number electric vehicles (EVs) their charging infrastructures into grid poses new challenges VT measurement fidelity, including instabilities harmonic disruptions. This paper introduces an innovative error prediction model that synthesizes Multivariate Variational Mode Decomposition (MVMD) with deep learning framework...
Based on the diversified application scenarios at Ant Group, we built Knowledge Graph Platform (AKGP). It has constructed numerous domain-specific knowledge graphs related to merchants, companies, accounts, products, and more. AKGP manages trillions of structured graphs, serving search, recommendation, risk control other businesses. However, as demand increasing for various workloads such graph pattern matching, representation learning, cross-domain reuse, existing warehouse systems based...
The effect of the motional electromagnetic force in forming circuit on workpiece velocity is analyzed. differential equations unconsidering and considering are solved numerically. results without unavailable because they violate law conservation energy, while with can accurately reflect process. Furthermore, it found that electrical energy transforms into kinetic due to force.
The effects of Y-doping on spin entropy Ca3Co4O9+δ have been investigated through measurements magnetothermopower and magnetic properties. temperature dependence thermopower at 4 T is weaker than that 0 T, showing a clear field-induced suppression large contribution from entropy. results demonstrate Co4+ concentration decreases with increasing level, which gives rise to enhanced A suitable model adopted explain commendably the enhancement.
Background: Electronic voltage transformer (EVT) is an essential metering device for future substation automation systems. One of the main drawbacks EVT its poor long-term stability, which affects measurement accuracy. This will, in turn, adversely affect entire protection and control systems it employed for. Objective: Aiming at reducing error over operation, prediction method combining Prophet, temporal convolutional network (TCN) selfattention proposed this paper. Methods: The based on...
Background: Currently, how to measure the magnetic field accurately is a difficulty in study of strong field. Methods: This paper summarizes several methods measurement techniques for pulsed presently, principles and characteristics various are compared analyzed. The maximum intensity electromagnetic induction method can reach 103T. magneto-optical effect Faraday 0.1~10T, error within 10-2T. Results: MOKE up 100T, with an 3×10-2T. Zeeman be measured 1~20T. Conclusion: existential problems...