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Dive into the research topics where Zhiyong Hong is active.

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Featured researches published by Zhiyong Hong.


Superconductor Science and Technology | 2006

Numerical solution of critical state in superconductivity by finite element software

Zhiyong Hong; A.M. Campbell; T. A. Coombs

A numerical method is proposed to analyse the electromagnetic behaviour of systems including high-temperature superconductors (HTSCs) in time-varying external fields and superconducting cables carrying AC transport current. The E–J constitutive law together with an H-formulation is used to calculate the current distribution and electromagnetic fields in HTSCs, and the magnetization of HTSCs; then the forces in the interaction between the electromagnet and the superconductor and the AC loss of the superconducting cable can be obtained. This numerical method is based on solving the partial differential equations time dependently and is adapted to the commercial finite element software Comsol Multiphysics 3.2. The advantage of this method is to make the modelling of the superconductivity simple, flexible and extendable.


Superconductor Science and Technology | 2011

An improved FEM model for computing transport AC loss in coils made of RABiTS YBCO coated conductors for electric machines

Mark Douglas Ainslie; Victor Manuel Rodriguez-Zermeno; Zhiyong Hong; Weijia Yuan; Tj Flack; T. A. Coombs

AC loss can be a significant problem for any applications that utilize or produce an AC current or magnetic field, such as an electric machine. The authors investigate the electromagnetic properties of high temperature superconductors with a particular focus on the AC loss in superconducting coils made from YBCO coated conductors for use in an all-superconducting electric machine. This paper presents an improved 2D finite element model for the cross-section of such coils, based on the H formulation. The model is used to calculate the transport AC loss of a racetrack-shaped coil using constant and magnetic field-dependent critical current densities, and the inclusion and exclusion of a magnetic substrate, as found in RABiTS (rolling-assisted biaxially textured substrate) YBCO coated conductors. The coil model is based on the superconducting stator coils used in the University of Cambridge EPEC Superconductivity Groups all-superconducting permanent magnet synchronous motor design. To validate the modeling results, the transport AC loss of a stator coil is measured using an electrical method based on inductive compensation by means of a variable mutual inductance. Finally, the implications of the findings on the performance of the motor are discussed.


Physical Review B | 2007

Behavior of bulk high-temperature superconductors of finite thickness subjected to crossed magnetic fields : Experiment and model

Ph. Vanderbemden; Zhiyong Hong; T. A. Coombs; S. Denis; Marcel Ausloos; J. Schwartz; I. Rutel; N. Hari Babu; D.A. Cardwell; A.M. Campbell

Crossed-magnetic-field effects on bulk high-temperature superconductors have been studied both experimentally and numerically. The sample geometry investigated involves finite-size effects along both (crossed-)magnetic-field directions. The experiments were carried out on bulk melt-processed Y-Ba-Cu-O single domains that had been premagnetized with the applied field parallel to their shortest direction (i.e., the


IEEE Transactions on Applied Superconductivity | 2010

Design and Test of a Superconducting Magnetic Energy Storage (SMES) Coil

Weijia Yuan; Wei Xian; Mark Douglas Ainslie; Zhiyong Hong; Yu Yan; R Pei; Y Jiang; T. A. Coombs

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Superconductor Science and Technology | 2008

The design, magnetization and control of a superconducting permanent magnet synchronous motor

Y Jiang; R Pei; Wei Xian; Zhiyong Hong; T. A. Coombs

axis) and then subjected to several cycles of the application of a transverse magnetic field parallel to the sample


Superconductor Science and Technology | 2007

A numerical method to estimate AC loss in superconducting coated conductors by finite element modelling

Zhiyong Hong; Q Jiang; R Pei; A.M. Campbell; T. A. Coombs

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IEEE Transactions on Applied Superconductivity | 2015

Study on No-Insulation HTS Pancake Coils With Iron Core for Superconducting DC Induction Heaters

Yawei Wang; Deqiang Xu; Hao Sun; Xu Liu; J. Sheng; Ke Li; Zhiyong Hong; Zhijian Jin; Z. Y. Li

plane. The magnetic properties were measured using orthogonal pickup coils, a Hall probe placed against the sample surface, and magneto-optical imaging. We show that all principal features of the experimental data can be reproduced qualitatively using a two-dimensional finite-element numerical model based on an


IEEE Transactions on Applied Superconductivity | 2007

Computer Modeling of Magnetisation in High Temperature Bulk Superconductors

Zhiyong Hong; A.M. Campbell; T. A. Coombs

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IEEE Transactions on Applied Superconductivity | 2009

The Next Generation of Superconducting Permanent Magnets: The Flux Pumping Method

T. A. Coombs; Zhiyong Hong; Yu Yan; Colin Rawlings

power law and in which the current density flows perpendicularly to the plane within which the two components of magnetic field are varied. The results of this study suggest that the suppression of the magnetic moment under the action of a transverse field can be predicted successfully by ignoring the existence of flux-free configurations or flux-cutting effects. These investigations show that the observed decay in magnetization results from the intricate modification of current distribution within the sample cross section. The current amplitude is altered significantly only if a field-dependent critical current density


Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering | 2011

Comparison of first- and second-order 2D finite element models for calculating AC loss in high temperature superconductor coated conductors

Mark Douglas Ainslie; Tj Flack; Zhiyong Hong; T. A. Coombs

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Collaboration


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T. A. Coombs

University of Cambridge

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Zhijian Jin

Shanghai Jiao Tong University

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Z. Y. Li

Shanghai Jiao Tong University

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R Pei

University of Cambridge

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Weijia Yuan

University of Cambridge

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Y Jiang

University of Cambridge

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Daoyu Hu

Shanghai Jiao Tong University

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Wei Wu

Shanghai Jiao Tong University

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Yawei Wang

Shanghai Jiao Tong University

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