9th IET International Conference on Computation in Electromagnetics (CEM 2014)
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- Location: London, UK
- Conference date: 31 March-1 April 2014
- ISBN: 978-1-84919-817-2
- Conference number: CP627
- The following topics are dealt with: computational electromagnetics; numerical methods; electromagnetic compatibility; electromagnetic interference; and code validation.
1 - 20 of 77 items found
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NSA simulation in semi-anechoic chamber using ray tube tracing method
- Author(s): Qian Xu ; Yi Huang ; Xu Zhu ; Lei Xing ; P. Duxbury ; J. Noonan
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A CAD software tool based on ray tube tracing technique has been successfully developed for anechoic chamber design which can deal with a chamber of an arbitrary shape and arbitrary layout of radio absorbing material (RAM). The normalised site attenuation (NSA) characteristics of a semianechoic chamber were estimated using the ray tube tracing method. The NSA values obtained for 3 m and 10 m semianechoic chambers with different height of transmitting antennas were compared with the values given in CISPR standard and a good agreement was obtained. It is shown that this software is robust and accurate for chamber simulation.
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Parallelisation of Coil Field Calculations
- Author(s): B.A. Saxby ; S.P. Malton ; J. Simkin
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Parallelisation of the Opera FEA simulation software from Cobham Technical Services, Vector Fields Software is necessary in order for it to make best use of modern hardware. This paper considers the parallelisation of the calculation of electromagnetic fields due to coils of tightly wound thin wires. Results showing excellent parallel speedup for realistic industrial models are presented.
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Generalized spectral decomposition approach to a stochastic finite integration technique electrokinetic formulation
- Author(s): L. Codecasa and L. Di Rienzo
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In order to efficiently solve a stochastic finite integration technique electrokinetic formulation a recently proposed generalized spectral decomposition approach is applied. Compared to a classical polynomial chaos expansion, the proposed approach dramatically reduces the computational burden. The results are validated by comparison with those obtained with high order polynomial chaos expansion, taken as the reference solution.
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BT RSS as a bending indicator in a deformable mobile device
- Author(s): H. Pohjonen ; M. Björksten ; M. Rouvala
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Bluetooth (BT) connectivity is today an essential feature in mobile devices complementing cellular connectivity. This paper discusses simulations of received signal strength (RSS) in a deformable product concept which includes two BT radiators and highlights opportunities and challenges to use RSS simulations during product concept phase.
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Coupling compensation of the antenna array response for direction finding applications
- Author(s): T.S. Ghazaany ; S. Zhu ; R.A. Alhameed ; S.M.R. Jones ; J.M. Noras ; T. Van Buren ; T. Suggett ; S. Marker
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In this research work the improvement of AOA estimation accuracy by applying a decoupling matrix derived using the receiving mode approach has been investigated using data measured in an anechoic chamber. The receiver was a 4-element uniform circular array with quarter wavelength inter-element spacing deployed on a square metal plate. The performance of the angle of arrival estimation error has been observed for two groups of direction finding algorithms, namely phase comparison-based (interferometry) and covariance-based algorithms. Mutual coupling compensation on AOA was found to improve accuracy by approximately 50%.
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Identification of rational function in s-domain describing a magnetic material frequency characteristics
- Author(s): M. Szewczyk ; J. Pawlowski ; K. Kutorasinski ; S. Burow ; S. Tenbohlen ; W. Piasecki
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High frequency magnetic cores are being used in different applications, from low-power electronic devices, up to high power components. For different material types it is required to identify material-specific equivalent circuit in order to simulate its behaviour in wide frequency range. This paper presents a method for obtaining such an equivalent circuit with the use of a rational function in s-domain such as it represents the material frequency characteristics. For the method presentation the measured data obtained for a real magnetic core was used.
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Computation of the Inverse Magnetostriction and its Application in Mechanical Stress Sensing
- Author(s): A. Belahcen ; T. Peussa ; D. Singh ; P. Rasilo
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This paper presents investigations on the modelling and use of inverse magnetostriction in contactless mechanical stress sensing. The emphasis is on the dynamic behaviour of the magneto-mechanical system and the eddy currents induced in the sensed part as well as their effect on the evaluation of the stress-induced magnetization and stress. The measurements show that the stress-induced magnetization depends strongly on the pre-magnetization. The simulations show that the eddy currents reduce the sensed voltage and the magnetic flux density and introduce time-delay. An analytical method is also proposed for online application.
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Efficient finite element assembly of high order whitney forms
- Author(s): N. Marsic and C. Geuzaine
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This paper presents an efficient method for the finite element assembly of high order Whitney elements. We start by reviewing the classical assembly technique and by highlighting the most time consuming part. Then, we show how this classical approach can be reformulated into a computationally efficient matrix - matrix product. We also address the problem of the basis orientation by considering more than one reference space. We conclude by presenting numerical results on a wave guide problem.
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A Circuit Human Body Model for an Indirect Lightning Strike Analysed by means of an FDTD Method
- Author(s): V.A. Alrim ; S.A. Amanatiadis ; A.X. Lalas ; C.S. Antonopoulos
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In the present paper, a simplified human body, stroked by a lightning touch voltage, is implemented via lumped elements and analysed through the finite-difference time-domain (FDTD) method. The results, so extracted, are compared with those of an electronic circuit simulator. Furthermore, the current induced to the human body in the vicinity of a lightning stroked object, is accurately calculated by the FDTD algorithm, which overwhelms the circuit modeller that is unable to simulate non-contact scenarios.
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Efficient Stochastic FDTD Algorithm with Optimised GPU Acceleration
- Author(s): A.N. Papadimopoulos ; G.G. Pyrialakos ; N.V. Kantartzis ; T.D. Tsiboukis
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A robust implementation of a stochastic finite-difference time-domain (S-FDTD) technique on modern graphics processing units (GPU) is introduced in this paper for complex media with high levels of statistically-variable heterogeneities. The featured method is compared to the multiple-realisation Monte-Carlo FDTD process, while both schemes are developed on an optimal CUDA (compute unified device architecture) programming platform. Therefore, via the GPU's enhanced parallelised features, a significant speedup is attained with regard to serialised computations as verified by several numerical results.
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A General Method to Calculate Harmonic Response of Teeth in Electric Machine
- Author(s): Yumin Xiao and Ping Zhou
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The harmonic components of electromagnetic force induce structure vibration and noise in electrical machines. There are many ways to calculate the harmonic force components. A general method is proposed to calculate the harmonic force components on teeth in this paper (it is available in ANSYS Maxwell v16). The period of data collection is based on rotating speed instead of the frequency of applied source. Discrete Fourier Transform (NDFT) with non-uniform time interval is applied to deal with the data transformation. Finally the calculated harmonic force spectrums are applied to the Harmonic Response to determine the vibration of the structure. Validation and calculation results are also showed.
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Scaling the huygens absorbing boundary condition code on shared memory architecture
- Author(s): H. Almeer ; F. Costen ; J.-P. Berenger ; R. Himeno ; H. Yokota
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The code of the FDTD method and the Huygens Absorbing Boundary Condition (HABC) is parallelized with OpenMP on shared memory architecture. The parallelisation efficiency of the strong scaling and the weak scaling is presented.
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An Interpretation of Adjoint Sensitivity Analysis for Shape Optimal Design of Electromagnetic Systems
- Author(s): Hyang-beom Lee and N. Ida
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This paper gives an interpretation of the meaning of the adjoint system and its variable, that are introduced in the process of shape optimal design of electro-magnetic systems with sensitivity analysis. Sensitivity formulas for the discrete and continuum approach are compared and the meaning of the adjoint system is discussed. The adjoint system simplifies sensitivity calculations, and provides the link information between the objective function and design variables.
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Magnetic forces and stresses in ferromagnetic material
- Author(s): L. Vandevelde and S.G. Ghalamestani
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1.14
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In this paper, the effect of the stresses in ferromagnetic materials is described based on the Chu model formulation. Such formulation is applied for the identification of the magnetoelastic behaviour of the magnetic materials. It is shown that a compressive stress is present in the ferromagnetic material, even if the stress tensor τ̄c is zero, which, as a result, tries to shorten the magnetic flux path length and shrink the magnetic core. The effect is further illustrated on a single-phase transformer core.
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Hybrid MoM/PO Antenna Modelling
- Author(s): J.A.L. Simpson
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Results of modelling antennas installed near electrically large platforms using a hybrid method-of-moments/physical optics code are reported here. A half-wavelength wire monopole driven by a delta-gap voltage source was positioned in two locations on a representative ship on a ground plane. All parts of the model were perfectly electrically conducing although the antenna was insulated from its mechanical support by a small air gap. The model was divided into physical optics and moment method domains and radiation pattern calculations were made using the hybrid method.
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Forward Solution for Lorentz Force Evaluation with Different Models of the Permanent Magnet
- Author(s): J. Mengelkamp ; K. Porzig ; M. Carlstedt ; M. Ziolkowski ; H. Brauer ; J. Haueisen
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In Lorentz force evaluation the model of the permanent magnet influences the accuracy of the forward solution. We assess the forward solution by modelling the permanent magnet with a varying number of magnetic dipoles. Our model comparison shows that a model with 10 dipoles is well suited for the forward calculation of Lorentz forces.
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GPU-Accelerated Mixed Precision Algebraic Multigrid Preconditioners for Discrete Elliptic Field Problems
- Author(s): C. Richter ; S. Schöps ; M. Clemens
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2.03
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In this paper the use of a mixed precision implementation of Krylov subspace methods with multigrid preconditioners is proposed for solving the large linear systems stemming from Finite Element or Finite Difference method discretizations of elliptic problems as they occur e.g. in electrostatics. The computational limits in speed and memory are discussed using the numerical example of a large scale 3D high voltage isolator model.
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Embedded Carbon Fibre Composite (CFC) Model for Arbitrary Contour Surfaces
- Author(s): Xuesong Meng ; P. Sewell ; A. Vukovic ; H. Nasser ; T.M. Benson
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A hollow circular cylinder composed of thin carbon fibre composite materials is modelled using the numerical Transmission Line Modelling (TLM) method. This is used as a canonical example of an object whose perimeter intersects the mesh at a variety of angles and inter sample positions. In this model, the thin cylinder wall is linearized and then embedded within the relatively coarse mesh. The embedded model eliminates the need for fine discretisation thus reducing the time step and memory requirements for the numerical method. To verify the accuracy of the embedded model the resonant frequencies of the CFC cylinder are compared with the analytical results of the equivalent metal cylinder. The scattering of the plane wave of the CFC cylinder is also analysed.
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A Mortar Edge Element Method with Overlapping for Time Domain Magnetodynamic calculations
- Author(s): A. Christophe ; F. Rapetti ; L. Santandrea ; G. Krebs ; Y. Le Bihan
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This paper deals with a mortar finite element approach with overlapping grids combined with an edge element discretization in space and an implicit Euler scheme in time. The bidirectional transfer of information between fixed and moving subdomains is described and its accuracy examined. The new method is exposed for a simple magnetodynamic problem.
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Higher-Order Eggshell Method for Computation of Forces Acting on Ferromagnetic Bodies
- Author(s): L. Korous ; P. Karban ; F. Mach ; I. Doležel
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2.07
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An alternative higher-order Eggshell method is proposed for determining forces acting on a ferromagnetic body in magnetic field. The strongly nonlinear problem is solved by the Newton method effectively implemented in our codes Agros2D and Hermes. The computation exhibits substantially higher parameters (accuracy, time of solution) than the algorithms used even in available professional codes. The methodology is illustrated with a typical example.
