A novel resonant tri-coil transducer is proposed to induce thermoacoustic (TA) signals for detecting rail internal defects. It consists of a ferrite plate-backed and its associated circuits, shielding layer, three-dimensional printed enclosure supporting securing. General TA detection theory illustrated understand how detect For achieving electromagnetic (EM) field shaping focusing, the physical structure optimized. reduces backward EM fields interference. Then, an equivalent circuit model...

Rail foot corrosion is an important issue for electrified railway system. It usually initiates at the bottom of rail edges covered by a clip and hardly accessible to conventional online inspection systems. To address this problem, study combines air-coupled ultrasonic transducer (AUT) laser-induced guided wave detect corrosion. The sensitivity below 500 kHz examined considering impact clip. results have shown that A <sub xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A novel compact multiple-input-multiple-output (MIMO) antenna with a wide impedance bandwidth and high port isolation is proposed for vehicular base stations. The design consists of four identical vertically-polarized monopole-based elements, which are symmetrical about the central axis placed 90 degrees apart from each other. wideband decoupling features theoretically analyzed experimentally demonstrated. Four resonant frequencies created by F-shaped radiator, independent reflector...

A gain-enhanced wideband multiple-input multiple-output (MIMO) antenna with dual polarization and high isolation is proposed for microbase station application. It includes two mutually orthogonal bowtie dipole radiators, four parasitic elements the switch function of ON-/OFF-state, vertical stubs, a cavity, which are fed by pair 50 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\Omega $...

A finite-element analysis (FEA) approach has been employed to predict the parasitic capacitance of secondary winding multisection, multilayer, and multiturn high-frequency high-voltage transformer by a two-dimensional-axisymmetric model using software COMSOL. With distribution magnetic field electric field, energy method is used calculate lumped capacitance. The 20 kHz, 40 kW with input voltage 380 V output 25 kV designed. windings different number sections, layers, turns investigated....

Efficient wireless power transmission to a designated location can reduce the size of implantable device and save source energy, but receiver coil rectifier circuit still occupy large area. This paper proposes novel magnetic resonant coupling (MRC)-based double figure-of-eight sensor system induce monitor heat. Implantable devices could obtain energy from surrounding electric field or heating effect. The fundamental generating effect by proposed coil-based is derived, conceptual architecture...

The current collector is a key component of most light rail transit (LRT) trains. It draws electric power from the catenary or for each moving train. Due to wear, tear, and harsh operating environments, will malfunction, which can lead unexpected interruptions train directly affect service reliability. This article presents an inductive coupling method health monitoring LRT trains powered by three-phase ac rail. system developed using proposed be easily fitted on so that it doubles up as...

A dual-coil magnet aimed at generating 90 T (at the center of bore) has been developed Wuhan National High Magnetic Field Center. This consists two coils nested coaxially. The inner coil is wound with eight layers 2.8 mm × 4.3 CuNb microcomposite wire in China; bore diameter 12 and outer 135 mm. was directly on 4 8 soft copper wire. All conductor were reinforced by Zylon/epoxy composite. driven a 1.6-MJ capacitor bank 11 1-MJ modules, respectively. At voltage 15.9 kV for 22.9 coil, produced...

A 100-T pulsed magnet with a bore size of 12 mm has been designed at the Wuhan National High Magnetic Field Center (WHMFC). This consists three coils. The inner coil will be wound from high-strength CuNb wire. middle and outer coils copper All reinforced Zylon/epoxy composite. In order to increase efficiency reduce coupling between them coil, have height 400 mm, which is shorter than 500-mm coil. are driven by 1.6- 11-MJ capacitor banks, combination 100-MJ/100-MW pulse generator 1000-V...

The high-frequency (HF) modeling of induction motors plays a key role in predicting the motor terminal overvoltage and conducted emissions drive system. In this study, physics informed neural network-based HF method, which has merits high accuracy, good versatility, simple parameterization, is proposed. proposed model consists three-phase equivalent circuit with eighteen elements per phase to ensure accuracy. structure symmetric concerning its phase-start phase-end points. This symmetry...

An improved electromagnetically launched method for driving specimens of composite materials is developed. The electromagnetic expansion ring device consists a solenoid and sample rings. made up eight layers copper wire reinforced with Zylon fiber, which can produce magnetic field to 35 T. composed high-conductivity driver (6061-T6 aluminum ring) layer Zylon/epoxy that directly wound on the driver. driven by 100-kJ (25 kV, 320 $\mu\text{F}$) capacitor bank designed inducing pulsed current in...

Motor impedance and mode transformation have significant effects on the electromagnetic interference (EMI) generated in motor drive systems. Stator winding faults commonly cause failure; however, their early stages, they may not affect short-term operation of motor. To date, EMI noise under influence premature stator has been adequately studied, particularly differential-mode (DM) due to common-mode (CM)-to-DM transformation. This study investigates quantifies DM First, transmission line...

The single-probe setup (SPS) based on the inductive coupling approach is a promising candidate for in-circuit impedance measurement of an energized electrical system due to its noncontact characteristics and simple configuration. However, conventional SPS performs with frequency-domain measuring instrument via stepped swept-sine excitation. It measures at only single frequency time while sweeping across frequencies interest, which not inefficient but also fast enough capture time-variant...

The pulsed high magnetic field facility funded by the Chinese National Development and Reformation Committee has been developed at Wuhan High Magnetic Field Center (WHMFC). Magnets of short pulse, long pulse combination both with bore sizes from 12 to 34 mm have are operational for electric transport, magnetization, magneto-optics electron spin resonance temperatures in range 100 mK 350 K. power supplies these magnets consist a capacitor bank modules 1 MJ/25 kV each 2 0.8 each, MVA/100 MJ...

Pulsed magnets with fast cooling channels have been developed at the Wuhan National High Magnetic Field Center. Between inner and outer sections of a coil wound continuous length CuNb wire, G10 rods cross section 4 mm × 5 were inserted as spacers around entire circumference, parallel to axis. The free space between adjacent is 6 mm. liquid nitrogen flows freely in these rods, direction perpendicular through grooves provided rods. For typical 60 T pulsed magnetic field pulse duration 40 ms,...

The Cu–Nb micro-composite wires are used as the conductors for pulsed magnet above 80 T at Wuhan National High Magnetic Field Center (WHMFC). fatigue properties of carried out with uniaxial tensile test, high-cycle test and four-point bend room temperature studied. indicates that a higher loading rate can enhance hardening wire especially initial stage plastic deformation, leading to 4% increment strength from lowest strain level highest one. reveals ratcheting occurs in every cycle after...

The anisotropy of electromagnetic performance high temperature superconducting (HTS) tapes is significant. BSCCO and YBCO, both which have been employed in industry already, varied when they stand different orientations magnetic field. In HTS magnet design, adopting optimization can directly affect the amount magnet, namely affects economy magnets. Considering measurement results field characteristics critical current technical requirement diminutive superconductor energy system(SMES)...

This paper proposes an easy-to-use accurate high- frequency (HF) behavioral model of induction motor with a simple and straightforward parameterization process for conducted electromagnetic interference (EMI) analysis. The HF contains only six circuit elements per phase structure is intended time-domain simulation variable drive (VFD) systems. are determined by multilayer perceptron (MLP) neural network, in which the phase-to-frame impedance needed training purposes. Compared methods...

As time goes by, the rails of high-speed trains are subject to long-term extrusion and natural factors, defects will gradually appear. Therefore, early detection these is extremely important for maintenance or replacement rails. In this article, a set rail internal crack system proposed developed, which can be easily conveniently deployed daily To improve speed, thermoacoustic technology utilized researched. For head defects, induced by coil antenna used detection. foot bottom corrosion,...

This work presents a novel compact multiple-input multi-output (MIMO) antenna which can be applied in the fifth generation (5G) network and internet of things (IoT). It is fed by four coaxial cables consists spatial orthogonal elements where two them are same plane other another plane. Each realized with different inverted L-monopoles grounded stubs. Different create respective resonant frequencies. Long stubs produce extra resonance frequency modes. The broadband characteristic enabled...