scholarly journals A Novel Planar Differential Koch Fractal Eddy Current Probe with Parallel Wound Topological Structure

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Guolong Chen ◽  
Zheng Cao ◽  
Weimin Zhang
Keyword(s):  
Eddy Current ◽  
Model Simulation ◽  
Three Dimensional ◽  
Complex Surface ◽  
Detailed Comparison ◽  
Element Model ◽  
Structure Design ◽  
Topological Transformation ◽  
Coil Structure ◽  
Novel Method

Flexible planar eddy current probes are widely used to detect conductive components with complex surface. In this study, topological transformation is applied to design a differential Koch coil exciting eddy current probe. Two kinds of Koch exciting coils, Koch A and Koch B , were obtained by topological transformation from a three-dimensional differential exciting eddy current probe. Finite element model simulation is conducted to visualize the differences of eddy current distributions induced by the probes and get the defect signal. A detailed comparison is made among the two kinds of Koch eddy current probes and a circular eddy current probe by experiments. The experiments demonstrate that the sensitivity of the Koch A eddy current probe is higher than that of another two probes for detecting the defect which is shorter than the size of the probe. This work provides a novel method for improving the performance of eddy current probes in the coil structure design.

scholarly journals Analysis of AC Transport Loss in Conductor on Round Core Cables

2021 ◽  
Author(s):  
Jiabin Yang ◽  
Chao Li ◽  
Mengyuan Tian ◽  
Shuyu Liu ◽  
Boyang Shen ◽  
...  
Keyword(s):  
Eddy Current ◽  
Complex Geometry ◽  
Layer Structure ◽  
Single Layer ◽  
Element Model ◽  
Structure Design ◽  
Ac Loss ◽  
Shielding Effect ◽  
Transport Loss ◽  
Electro Magnetic

AbstractThe conductor on round core (CORC) cable wound with second-generation high-temperature superconducting (HTS) tapes is a promising cable candidate with superiority in current capacity and mechanical strength. The composing superconductors and the former are tightly assembled, resulting in a strong electro-magnetic interaction between them. Correspondingly, the AC loss is influenced by the cable structure. In this paper, a 3D finite-element model of the CORC cable is first built, and it includes the complex geometry, the angular dependence of critical current and the periodic settings. The modelling is verified by the measurements conducted for the transport loss of a two-layer CORC cable. Subsequently, the simulated results show that the primary transport loss shifts from the former to the superconductors as the current increases. Meanwhile, the loss exhibited in the outer layer is larger than that of the inner layer, which is caused by the shielding effect among layers and the former. This also leads to the current inhomogeneity in CORC cables. In contrast with the two-layer case, the simulated single-layer structure indicates stronger frequency dependence because the eddy current loss in the copper former is always dominant without the cancellation of the opposite-wound layers. The core eddy current of the single structure is denser on the outer surface. Finally, the AC transport losses among a straight HTS tape, a two-layer cable and a single-layer cable are compared. The two-layer structure is confirmed to minimise the loss, meaning an even-numbered arrangement makes better use of the cable space and superconducting materials. Having illustrated the electro-magnetic behaviour inside the CORC cable, this work is an essential reference for the structure design of CORC cables.

Fitting Analysis of Soil Strength Parameter Based on the Finite Element Method

2012 ◽  
Vol 204-208 ◽  
pp. 382-388
Author(s):  
Bin Yang ◽  
Li Ying Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Internal Force ◽  
Soil Strength ◽  
Structure Design ◽  
Strength Parameter ◽  
Navigation Lock ◽  
Element Method

Abstract: This paper takes the project of the navigation lock in Jialing River as an example to study the lock head structure design layout, and build up a three-dimensional finite element model and carry on the nonlinear numerical calculations by using large finite software ABAQUS, and calculating the structural internal force of the lock head by the 3D nonlinear finite element method. This paper utilizes the numerical analysis method to analyze soil strength parameters. Combining with the FEM calculation data, the data-fit between the influencing factors and the side piers’ stress and displacement was found. This provides new thoughts to analyze the influence of multivariate interaction on the lock head structure.

Development of electrostatic induction coal dust concentration sensor based on plate-ring detection electrode

2021 ◽  
Author(s):  
jiange chen ◽  
Dewen Li ◽  
Kequan Wang ◽  
Jie Wang ◽  
Guoqing Liu ◽  
...  
Keyword(s):  
Coal Dust ◽  
Three Dimensional ◽  
Element Model ◽  
Central Moment ◽  
Structure Design ◽  
Dust Concentration ◽  
Detection Accuracy ◽  
Induction Signal ◽  
Electrostatic Induction ◽  
Detection Electrode

Abstract In order to increase the detection accuracy of coal dust and reduce the maintenance of the coal dust concentration sensor, in this paper, the electrostatic sensor of the plate-ring detection electrode was developed for the detection of coal dust concentration. Through the establishment of the three-dimensional finite element model of the plate-ring detection electrode and the simulation results of COMSOL, the superiority of the plate-ring detection electrode was demonstrated, and the basis for the structure design of the plate-ring detection electrode was provided. The plate-ring detection electrode and the processing circuit of the tiny electrostatic induction signal were designed. Electrostatic induction dust concentration sensor with plate-ring detection electrode was developed. Experiments and data analysis proved that the 1.5-order central moment of the electrostatic induction signal had a high degree of fit with the dust concentration value. The mathematical relationship between the electrostatic induction signal and the dust concentration was determined. The detection error of coal mine dust concentration sensor based on plate-ring detection electrode did not exceed 10%.

Finite Element Study on Influence of Ring Beam at Top Window Sill Elevation on Temperature Effect of Masonry

2012 ◽  
Vol 204-208 ◽  
pp. 4110-4114
Author(s):  
Wei Jun Yang ◽  
Ning Guo ◽  
Hai Dian Zhang
Keyword(s):  
Finite Element ◽  
Model Simulation ◽  
Element Model ◽  
Masonry Structure ◽  
Structure Design ◽  
Brick Masonry ◽  
Effect Analysis ◽  
Control And Prevention ◽  
Finite Element Model Simulation ◽  
Difference Effect

This paper mainly studies on the problem of the temperature cracks of the concrete perforated brick masonry structure by finite element model simulation and the stress distribution of masonry at the top window sill elevation under temperature difference effect. Analysis the influence of setting ring beam at the top window sill elevation on temperature stress of masonry, Summed up some measures about control and prevention of masonry temperature cracks at the top window sill elevation, it can be referenced for concrete perforated brick masonry structure design and construction.

scholarly journals A fully three-dimensional finite-element model applied to velocities on Storglaciären, Sweden

1995 ◽  
Vol 41 (137) ◽  
pp. 91-102 ◽  
Author(s):  
Brian Hanson
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Simulation ◽  
Three Dimensional ◽  
Element Model ◽  
Three Dimensions ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Type Power ◽  
Flow Plane

AbstractA finite-element model that solves the stress-balance equations for glacier dynamics in three dimensions has been developed by extending previous flow-plane models. This model retains all terms of the stress tensor and uses a Glen-type power law for viscosity calculations. In the paper, the model is applied to Storglaciären, Sweden, to explore both the glacier’s dynamics and the model’s characteristics. Values of the stiffness parameterBof 0.20–0.22 MPa year1/nwere required to match observed strain rates on Storglaciären. Overall velocities required imposition of a problematically small sliding speed. Stress fields implied by the model simulation showed that the glacier receives its largest driving force from a high-slope zone near the equilibrium line, and that a large proportion of the resistive stress comes from lateral drag. Lateral drag is enhanced on this glacier by being frozen to its sidewalls and by a turning of the main flow as it comes out of the main, or northern, cirque.

Three-Dimensional Finite Element Modeling and Front Crash Process Analysis of Car Bodywork

2010 ◽  
Vol 44-47 ◽  
pp. 920-923
Author(s):  
Li Xin Guo ◽  
Jie Gong ◽  
Jin Li Li
Keyword(s):  
Finite Element ◽  
Traffic Accidents ◽  
Process Analysis ◽  
Three Dimensional ◽  
Element Model ◽  
Economic Loss ◽  
Structure Design ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Front Crash

Traffic accidents cause to a large quantity of personnel casualty and economic loss every year. The safety in vehicle crash has been one of important criterions in vehicle design. In this study a three-dimensional finite element model was established and the front crash process of car bodywork was analyzed. The simulation results show that the structure design of car bodywork is reasonable and of safety for the passengers. The investigation of this study not only validates the rationality of the car bodywork design but also provides a detailed numerical simulation model for further investigation as well as improvement and optimization of the car bodywork structure.

scholarly journals Embedded Discrete Fracture Modeling as a Method to Upscale Permeability for Fractured Reservoirs

Energies ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 812 ◽  
Author(s):  
Zhenzhen Dong ◽  
Weirong Li ◽  
Gang Lei ◽  
Huijie Wang ◽  
Cai Wang
Keyword(s):  
Fluid Flow ◽  
Multiphase Flow ◽  
Fractured Reservoirs ◽  
Three Dimensional ◽  
Detailed Comparison ◽  
Fine Grid ◽  
Equivalent Permeability ◽  
Fracture Modeling ◽  
Discrete Fracture ◽  
Novel Method

Fractured reservoirs are distributed widely over the world, and describing fluid flow in fractures is an important and challenging topic in research. Discrete fracture modeling (DFM) and equivalent continuum modeling are two principal methods used to model fluid flow through fractured rocks. In this paper, a novel method, embedded discrete fracture modeling (EDFM), is developed to compute equivalent permeability in fractured reservoirs. This paper begins with an introduction on EDFM. Then, the paper describes an upscaling procedure to calculate equivalent permeability. Following this, the paper carries out a series of simulations to compare the computation cost between DFM and EDFM. In addition, the method is verified by embedded discrete fracture modeling and fine grid methods, and grid-block and multiphase flow are studied to prove the feasibility of the method. Finally, the upscaling procedure is applied to a three-dimensional case in order to study performance for a gas injection problem. This study is the first to use embedded discrete fracture modeling to compute equivalent permeability for fractured reservoirs. This paper also provides a detailed comparison and discussion on embedded discrete fracture modeling and discrete fracture modeling in the context of equivalent permeability computation with a single-phase model. Most importantly, this study addresses whether this novel method can be used in multiphase flow in a reservoir with fractures.

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