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E Michielssen - One of the best experts on this subject based on the ideXlab platform.

  • a parallel fft accelerated transient Field Circuit simulator
    IEEE Transactions on Microwave Theory and Techniques, 2005
    Co-Authors: Ali E Yilmaz, Jianming Jin, E Michielssen
    Abstract:

    A novel fast electromagnetic Field-Circuit simulator that permits the full-wave modeling of transients in nonlinear microwave Circuits is proposed. This time-domain simulator is composed of two components: 1) a full-wave solver that models interactions of electromagnetic Fields with conducting surfaces and finite dielectric volumes by solving time-domain surface and volume electric Field integral equations, respectively, and 2) a Circuit solver that models Field interactions with lumped Circuits, which are potentially active and nonlinear, by solving Kirchoff's equations through modified nodal analysis. These Field and Circuit analysis components are consistently interfaced and the resulting coupled set of nonlinear equations is evolved in time by a multidimensional Newton-Raphson scheme. The solution procedure is accelerated by allocating Field- and Circuit-related computations across the processors of a distributed-memory cluster, which communicate using the message-passing interface standard. Furthermore, the electromagnetic Field solver, whose demand for computational resources far outpaces that of the Circuit solver, is accelerated by a fast Fourier transform (FFT)-based algorithm, viz. the time-domain adaptive integral method. The resulting parallel FFT accelerated transient Field-Circuit simulator is applied to the analysis of various active and nonlinear microwave Circuits, including power-combining arrays.

  • a fast hybrid Field Circuit simulator for transient analysis of microwave Circuits
    IEEE Transactions on Microwave Theory and Techniques, 2004
    Co-Authors: Kemal Aygun, B C Fischer, Jun Meng, B Shanker, E Michielssen
    Abstract:

    A plane-wave-time-domain accelerated time-domain integral-equation solver is coupled to a SPICE-like transient Circuit simulator to analyze electromagnetic platform-Circuit interactions. The hybrid Field-Circuit simulator simultaneously solves surface-wire-volume time-domain integral equations that model electromagnetic interactions with the platform and modified nodal analysis equations that govern the behavior of the potentially nonlinear lumped Circuits. A shielded nonlinear microwave amplifier is analyzed using the proposed scheme, and its immunity to electromagnetic interference is assessed.

Kay Hameyer - One of the best experts on this subject based on the ideXlab platform.

  • Eddy Currents and Non-Conforming Sliding Interfaces for Motion in 3-D Finite Element Analysis of Electrical Machines
    IEEE Transactions on Magnetics, 2015
    Co-Authors: Stefan Böhmer, Christian Kruttgen, Björn Riemer, Kay Hameyer
    Abstract:

    This paper presents non-conforming sliding interfaces for motion in 3-D finite element simulations. Sliding interfaces are favorable, especially for Field Circuit coupling in comparison to other approaches such as the Lockstep method because an arbitrary position of the rotor is possible. A previously presented approach by the authors is extended to take eddy-currents into account. The sliding interfaces approach utilizes specific Lagrange multiplier to handle the relative motion between stator and rotor which require a magnetic scalar potential formulation. The formulation is presented as well as methods to compute the mandatory cohomology basis functions.

  • acoustic simulation of a special switched reluctance drive by means of Field Circuit coupling and multiphysics simulation
    IEEE Transactions on Industrial Electronics, 2010
    Co-Authors: M Van Der Giet, E Lange, D A P Correa, Ivan Eduardo Chabu, Silvio Ikuyo Nabeta, Kay Hameyer
    Abstract:

    The approach presented in this paper consists of an energy-based Field-Circuit coupling in combination with multiphysics simulation of the acoustic radiation of electrical machines. The proposed method is applied to a special switched reluctance motor with asymmetric pole geometry to improve the start-up torque. The pole shape has been optimized, subject to low torque ripple, in a previous study. The proposed approach here is used to analyze the impact of the optimization on the overall acoustic behavior. The Field-Circuit coupling is based on a temporary lumped-parameter model of the magnetic part incorporated into a Circuit simulation based on the modified nodal analysis. The harmonic force excitation is calculated by means of stress tensor computation, and it is transformed to a mechanical mesh by mapping techniques. The structural dynamic problem is solved in the frequency domain using a finite-element modal analysis and superposition. The radiation characteristic is obtained from boundary element acoustic simulation. Simulation results of both rotor types are compared, and measurements of the drive are presented.

  • testcase a benchmark problem for coupled Field Circuit simulations
    Compel-the International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 2009
    Co-Authors: M Van Der Giet, E Lange, Kay Hameyer
    Abstract:

    Purpose – The purpose of this paper is to present an experimental setup for the verification of coupled electromagnetic Field‐Circuit simulation, called TESTCASE. By means of simple and well‐defined geometries, the comparison of different coupling approaches among each other and with measurements should be possible.Design/methodology/approach – The physical setup consists of a C‐core in conjunction with a reluctance rotor. The TESTCASE is designed to work in static operation and with motion induced voltage.Findings – Simulation results using different approaches as well as measurement results are presented. Practical issues in measurement and simulation are discussed. It was found that particular care has to be taken concerning the modeling of the air around the TESTCASE structure.Originality/value – With the proposed approach, it is possible to evaluate the coupled Field Circuit problem on a defined and well‐known geometry. Simulation results can be compared to measurements.

  • an efficient Field Circuit coupling based on a temporary linearization of fe electrical machine models
    IEEE Conference on Electromagnetic Field Computation, 2009
    Co-Authors: E Lange, Francois Henrotte, Kay Hameyer
    Abstract:

    A Field-Circuit coupling method is presented, whose basic idea is to extract from the finite-element (FE) model a linearized lumped parameter representation of the electrical machines, to be used in the Circuit simulator model of the power electronic supply. The dynamic coupled model of the complete drive obtained this way can be iterated over a limited period of time, with a time step adapted to the high frequency of electronic commutations. When the temporary representation of the machine has come, or is expected to have come under a given accuracy threshold, a new FE simulation is performed, a new set of lumped is generated and the process is repeated. This method allows decoupling the time constants of the Field problem from that of the Circuit problem, which is typically one or two orders of magnitude smaller. This yields a considerable saving of computation time with a controllable, at least a posteriori, loss of accuracy.

  • Optimal control of electromagnetic actuator considering energy loss minimisation in electric Circuit
    Computation in Electromagnetics, 2008. CEM 2008. 2008 IET 7th International Conference on, 2008
    Co-Authors: Slawomir Stepien, Grzegorz Szymanski, Kay Hameyer
    Abstract:

    A finite element - based simulation of the single - phase electromagnetic actuator control including 3D electromagnetic Field, Circuit and movement model coupling to optimal control is presented. The subject of this paper is to study an optimal control technique that minimises quadratic energy function in the electric Circuit. As a new contribution an algorithm based on Linear Quadratic Problem coupled with electromagnetic actuator model in a closed - loop control system is proposed.

Li Jun Jiang - One of the best experts on this subject based on the ideXlab platform.

  • transient heterogeneous electromagnetic simulation with dgtd and behavioral macromodel
    IEEE Transactions on Electromagnetic Compatibility, 2017
    Co-Authors: Huan Huan Zhang, He Ming Yao, Li Jun Jiang, Yu Zhang
    Abstract:

    A novel hybrid Field-Circuit simulation method is proposed for transient heterogeneous electromagnetic simulations. It adopts the discontinuous Galerkin time domain (DGTD) method and behavioral macromodel trained by artificial neural network to analyze the electromagnetic structure and Circuit network, respectively. Due to the feature of DGTD method and behavioral macromodel, the proposed method can handle not only electromagnetic structures with complex geometries and materials but also manage Circuits with unknown internal details. It provides a new approach that has the trainable accuracy to meet today's IP projection requestions. It is also the first time for DGTD algorithm to work with the behavior model. Numerical examples have been benchmarked to demonstrate the capability of the proposed method.

  • novel time domain integral equation method hybridized with the macromodels of Circuits
    Electrical Design of Advanced Packaging and Systems Symposium, 2016
    Co-Authors: Huan Huan Zhang, He Ming Yao, Li Jun Jiang
    Abstract:

    This work presents a novel transient Field-Circuit simulation method based on the time-domain integral equation (TDIE) and Circuit macromodels. The traditional Field-Circuit simulation method constructs the Kirchoff's equations for lumped Circuits with SPICE models, but they cannot handle problems with unknown Circuit structures. The proposed method creates parametric macromodels to represent the port constitutive relations of the unknown Circuits. Then the obtained macromodel is coupled with TDIE to enable the transient Field-Circuit cosimulation. Numerical examples are given to demonstrate the validity of the proposed method. The proposed method is targeted to solve unknown I/O modeling issues in general signal integrity problems.

  • coupling dgtd and behavioral macromodel for transient heterogeneous electromagnetic simulations
    International Symposium on Electromagnetic Compatibility, 2016
    Co-Authors: Huan Huan Zhang, He Ming Yao, Li Jun Jiang, Yu Zhang
    Abstract:

    A novel transient Field-Circuit cosimulation method based on the discontinuous Galerkin time domain (DGTD) method and Circuit behaviour macromodels for heterogeneous electromagnetics such as EMC problems is proposed. The traditional Field-Circuit simulation method needs to know the detail of the Circuits, which cannot handle problems with unknown systems due to IP protections. To overcome this problem, the proposed method utilizes the artificial neural network (ANN) to create trainable behavioral macromodels of the unknown Circuits based on the port currents and port voltages. The obtained macromodel is then coupled with DGTD that describes the behavior of electromagnetic subsystem to form equations of the whole system, which can be solved to obtain transient Fields, voltages and currents. Numerical examples have been benchmarked to demonstrate the capability of the proposed method.

  • embedding the behavior macromodel into tdie for transient Field Circuit simulations
    IEEE Transactions on Antennas and Propagation, 2016
    Co-Authors: Huan Huan Zhang, Li Jun Jiang
    Abstract:

    A novel transient Field-Circuit simulation method based on the time-domain integral equation (TDIE) and Circuit macromodels is proposed. The traditional Field-Circuit simulation process constructs Kirchoff’s equations for linear or nonlinear lumped Circuits, which cannot handle problems with unknown Circuit structure. The proposed method creates parametric behavior macromodels to represent the port constitutive relations of the Circuits. Artificial neural network technique is adopted to estimate the model parameters based on the known port voltages and currents. Then, the obtained macromodel is coupled with TDIE that describes the behavior of electromagnetic subsystem to form the equations of a whole system, which can be solved to obtain the Fields, voltages, and currents. Numerical examples are presented to demonstrate the validity of the proposed method.

Huan Huan Zhang - One of the best experts on this subject based on the ideXlab platform.

  • transient heterogeneous electromagnetic simulation with dgtd and behavioral macromodel
    IEEE Transactions on Electromagnetic Compatibility, 2017
    Co-Authors: Huan Huan Zhang, He Ming Yao, Li Jun Jiang, Yu Zhang
    Abstract:

    A novel hybrid Field-Circuit simulation method is proposed for transient heterogeneous electromagnetic simulations. It adopts the discontinuous Galerkin time domain (DGTD) method and behavioral macromodel trained by artificial neural network to analyze the electromagnetic structure and Circuit network, respectively. Due to the feature of DGTD method and behavioral macromodel, the proposed method can handle not only electromagnetic structures with complex geometries and materials but also manage Circuits with unknown internal details. It provides a new approach that has the trainable accuracy to meet today's IP projection requestions. It is also the first time for DGTD algorithm to work with the behavior model. Numerical examples have been benchmarked to demonstrate the capability of the proposed method.

  • novel time domain integral equation method hybridized with the macromodels of Circuits
    Electrical Design of Advanced Packaging and Systems Symposium, 2016
    Co-Authors: Huan Huan Zhang, He Ming Yao, Li Jun Jiang
    Abstract:

    This work presents a novel transient Field-Circuit simulation method based on the time-domain integral equation (TDIE) and Circuit macromodels. The traditional Field-Circuit simulation method constructs the Kirchoff's equations for lumped Circuits with SPICE models, but they cannot handle problems with unknown Circuit structures. The proposed method creates parametric macromodels to represent the port constitutive relations of the unknown Circuits. Then the obtained macromodel is coupled with TDIE to enable the transient Field-Circuit cosimulation. Numerical examples are given to demonstrate the validity of the proposed method. The proposed method is targeted to solve unknown I/O modeling issues in general signal integrity problems.

  • coupling dgtd and behavioral macromodel for transient heterogeneous electromagnetic simulations
    International Symposium on Electromagnetic Compatibility, 2016
    Co-Authors: Huan Huan Zhang, He Ming Yao, Li Jun Jiang, Yu Zhang
    Abstract:

    A novel transient Field-Circuit cosimulation method based on the discontinuous Galerkin time domain (DGTD) method and Circuit behaviour macromodels for heterogeneous electromagnetics such as EMC problems is proposed. The traditional Field-Circuit simulation method needs to know the detail of the Circuits, which cannot handle problems with unknown systems due to IP protections. To overcome this problem, the proposed method utilizes the artificial neural network (ANN) to create trainable behavioral macromodels of the unknown Circuits based on the port currents and port voltages. The obtained macromodel is then coupled with DGTD that describes the behavior of electromagnetic subsystem to form equations of the whole system, which can be solved to obtain transient Fields, voltages and currents. Numerical examples have been benchmarked to demonstrate the capability of the proposed method.

  • embedding the behavior macromodel into tdie for transient Field Circuit simulations
    IEEE Transactions on Antennas and Propagation, 2016
    Co-Authors: Huan Huan Zhang, Li Jun Jiang
    Abstract:

    A novel transient Field-Circuit simulation method based on the time-domain integral equation (TDIE) and Circuit macromodels is proposed. The traditional Field-Circuit simulation process constructs Kirchoff’s equations for linear or nonlinear lumped Circuits, which cannot handle problems with unknown Circuit structure. The proposed method creates parametric behavior macromodels to represent the port constitutive relations of the Circuits. Artificial neural network technique is adopted to estimate the model parameters based on the known port voltages and currents. Then, the obtained macromodel is coupled with TDIE that describes the behavior of electromagnetic subsystem to form the equations of a whole system, which can be solved to obtain the Fields, voltages, and currents. Numerical examples are presented to demonstrate the validity of the proposed method.

Arjan Verweij - One of the best experts on this subject based on the ideXlab platform.

  • optimized Field Circuit coupling for the simulation of quenches in superconducting magnets
    arXiv: Computational Physics, 2017
    Co-Authors: Idoia Cortes Garcia, Sebastian Schöps, B Auchmann, Michal Maciejewski, Lorenzo Bortot, Marco Prioli, Arjan Verweij
    Abstract:

    In this paper, we propose an optimized Field/Circuit coupling approach for the simulation of magnetothermal transients in superconducting magnets. The approach improves the convergence of the iterative coupling scheme between a magnetothermal partial differential model and an electrical lumped-element Circuit. Such a multi-physics, multi-rate and multi-scale problem requires a consistent formulation and a dedicated framework to tackle the challenging transient effects occurring at both Circuit and magnet level during normal operation and in case of faults. We derive an equivalent magnet model at the Circuit side for the linear and the non-linear settings and discuss the convergence of the overall scheme in the framework of optimized Schwarz methods. The efficiency of the developed approach is illustrated by a numerical example of an accelerator dipole magnet with accompanying protection system.

  • optimized Field Circuit coupling for the simulation of quenches in superconducting magnets
    IEEE Journal on Multiscale and Multiphysics Computational Techniques, 2017
    Co-Authors: Idoia Cortes Garcia, Sebastian Schöps, B Auchmann, Michal Maciejewski, Lorenzo Bortot, Marco Prioli, Arjan Verweij
    Abstract:

    In this paper, we propose an optimized Field/Circuit coupling approach for the simulation of magnetothermal transients in superconducting magnets. The approach improves the convergence of the iterative coupling scheme between a magnetothermal partial differential model and an electrical lumped-element Circuit. Such a multiphysics, multirate, and multiscale problem requires a consistent formulation and a dedicated framework to tackle the challenging transient effects occurring at both the Circuit and magnet level during normal operation and in case of faults. We derive an equivalent magnet model at the Circuit side for the linear and the nonlinear settings and discuss the convergence of the overall scheme in the framework of optimized Schwarz methods. The efficiency of the developed approach is illustrated by a numerical example of an accelerator dipole magnet with accompanying protection system.