International Journal of Applied Electromagnetics and Mechanics - Volume 50, issue 1

Authors: Wang, Bo | Zhuang, Yiqi | Li, Xiaoming | Zhang, Yanlong | Qi, Zengwei | Ren, Xiaojiao

Article Type: Research Article

Abstract: A low profile planar monopole antenna with a small stub fed by a bent microstrip line with high gain is presented for RFID reader applications. The proposed antenna operates in microwave band of RFID, namely, 2.4 GHz band and 5.8 GHz band. A wide impedance bandwidth of 820 MHz has been achieved from 2 GHz to 2.82 GHz for the lower band, while the upper band covers 500 MHz from 5.6 GHz to 6.1 GHz. This paper minimizes the size of the antenna through modifying L-shape microstrip feed line. The antenna has a compact size of 40 mm × …37.5 mm × 1.6 mm, however, with a high gain critical for RFID reader applications. The antenna achieves 4.3 dBi and 8.1 dBi in 2.4 GHz band and 5.8 GHz band, respectively. Furthermore, crucial parameters are investigated to examine the effects of the antenna parameters on reflection coefficient as well as the impedance bandwidth of the antenna. Show more

Keywords: Compact antenna, modified L-shape, dual band

DOI: 10.3233/JAE-140154

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 1-10, 2016

Authors: Islam, M.M. | Islam, M.T. | Faruque, M.R.I. | Misran, N. | Samsuzzaman, M. | Hossain, M.I. | Alam, T.

Article Type: Research Article

Abstract: In this paper, a disc-shaped monopole antenna has been investigated for super-wideband applications with a structure of parasitic element. The proposed SWB antenna consists of disc-shaped patch and a partial ground plane with a structure of parasitic element. The parasitic element consists of 4 rectangular embedded slots on the ground plane. This parasitic element on the ground plane leads the UWB frequency band into the SWB frequency band. This proposed SWB antenna is fed by a microstrip line and is printed on low dielectric FR4 material of 1.6 mm thickness. All the simulations are performed using commercially available, finite element …method (FEM) based Ansoft high-frequency structure simulator (HFSS) software and CST Microwave Studio. Measured results exhibit that the proposed disc-shaped antenna shows a wide bandwidth which covers from 2.90 GHz to more than 20 GHz, with a compact dimension of 25 mm × 33 mm for VSWR < 2, observing a SWB frequency. A good combination is noticed between simulation and measurement. The simple construction, sharply, surface current flow, much impedance bandwidth, nearly omnidirectional radiation patterns, stable peak gain (3.20-6.22 dBi) and a considerable bandwidth dimension ratio (≥ 2062. 22) are a good deal sounder than the existing super wideband antennas which make it appropriate for many wireless communication systems such as L, C, X, UWB, Ku, and SWB bands. Show more

Keywords: Microstrip line, parasitic element, SWB, UWB

DOI: 10.3233/JAE-140188

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 11-28, 2016

Authors: Abd Fatah, Abdul Yasser | Mazlan, Saiful Amri | Koga, Tsuyoshi | Zamzuri, Hairi | Imaduddin, Fitrian

Article Type: Research Article

Abstract: Magnetorheological (MR) valve is widely applied in a lot of applications that utilizes the flow mode, which is one of the working modes available for MR fluid devices. This paper introduces the serpentine flux path method in an MR valve, whereby using this method it can help to increase the effective region of the valve. The magnetic flux is guided into the annular gap of the valve, as the magnetic flux can be weaved by alternating the magnetic and non-magnetic materials. The method is simulated using Finite Element Method Magnetics to see the effects of weaving steps and thicknesses of …non-magnetic materials to the magnetic flux distribution and pressure drop change in the valve. The results show that MR effective region can be increased with the serpentine flux path method, and the additional steps and thicknesses of non-magnetic materials help to further increase the pressure drops within the valve. Show more

Keywords: Magnetorheological fluid, magnetorheological valve, serpentine flux path, FEMM simulation

DOI: 10.3233/JAE-150037

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 29-44, 2016

Authors: Alam, T. | Islam, M.T. | Faruque, M.R.I. | Mansor, F. | Arshad, H. | Samsuzzaman, M.

Article Type: Research Article

Abstract: A novel compact microstrip patch circularly polarised antenna for mobile wireless application is presented in this paper. The proposed antenna is incorporated with quadrilateral shape radiator, inverted S-shape partial ground plane and 50 Ω microstrip feed line. A wide impedance bandwidth of 109.13% (1.69-5.75 GHz with measured 3 dB axial ratio (AR) bandwidth of 22.22% (2-2.5 GHz) is realized with overall electrical size of 0.26 λ × 0.21 λ × 0.01 λ at lower-end frequency. The antenna also exhibits good performance of circular polarization (CP) radiation with lower 3d B AR beamwidth of ± …60°. In addition, the specific absorption rate of the presented antenna is analysed. Show more

Keywords: Antenna, circular polarization, wideband, wireless communication

DOI: 10.3233/JAE-150043

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 45-49, 2016

Authors: Yaqoob, M.Z. | Shakir, I. | Ghaffar, A. | Khan, Y. | Naqvi, Q.A.

Article Type: Research Article

Abstract: Based on frame work of extended classical scattering theory, an analytical solution to transmission of an electromagnetic wave through nihility circular cylinder with anisotropic plasma coating is formulated, by expanding the incident wave, transmitted wave as well as scattered wave in the form of cylindrical vector wave function (CVWFs). The anisotropic effects associated with the parallel and perpendicular polarizations are described and analyzed. Further the scattering matrices approach is used to calculate the scattering coefficients. Under special condition, the results are found to be in good agreement with literature, which shows the accuracy of present work. Further, the effect of …plasma parameters and external magnetic field strength (B) on scattering echo width is studied. The results show that the plasma based scatterer can be used for the controlling, manipulation and tuning of electromagnetic waves. Show more

Keywords: Anisotropic, nihility, cylinder, scatterring, parallel and perpendicular polarization

DOI: 10.3233/JAE-150047

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 51-61, 2016

Authors: Chen, Junwei | Zhang, Bo | Ding, Ye | Ding, Han

Article Type: Research Article

Abstract: On the basis of the differential quadrature finite element method (DQFEM), this paper analyzes the field distribution of a new sinusoidal-edged Halbach magnet array in linear permanent-magnet actuators. By applying the proposed generalized blending function mapping from the irregular computational domain to the rectangular one, the magnetic field produced by a single sinusoidal-edged permanent magnet is solved. Then the magnetic field due to the magnet array is obtained by superposition. Numerical results show that the magnetic field obtained by the DQFEM is not only accurate in the middle part of the array, but also effective near the boundaries of the …array. In addition, the sinusoidal-edged Halbach magnet array produces a larger flux density with a small harmonic distortion, compared with rectangular and trapezoidal ones. Finally, design optimization is implemented and optimal solutions are achieved to compromise between the amplitude of flux density and the harmonic distortion. Show more

Keywords: Halbach magnet array, sinusoidal-edged, differential quadrature, DQFEM

DOI: 10.3233/JAE-150069

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 63-80, 2016

Authors: Pfützner, Helmut | Shilyashki, Georgi | Gerstbauer, Erich | Trenner, Gerald

Article Type: Research Article

Abstract: This paper puts a novel methodology of ``multi-directionally non-linear magnetic equivalent-circuit calculation'' (MACC) for discussion. It models transformer cores of Goss texture through local elements that are represented by non-linear magnetic resistances. From its concept, it allows for 2D or 3D distributions of induction components, considering arbitrary degrees of non-linearity and anisotropy. The present work describes modelling of rotational magnetization by means of a network of elements for flux in three different directions, the rolling direction (RD), the transverse direction (TD) and the diagonal direction (DD) in overlaps. Other directions are assumed to be ``hard'', thus being neglected. A 3-phase …core package is modelled by 41 elements, assuming two main flux paths. Three sets of nonlinear permeability functions are attributed to the individual elements, starting with roughly estimated induction distributions. The corresponding system of Kirchhoff equations is solved in well known ways. Step-wise approximations of the set of induction components are performed until they correspond with the set of permeability values in acceptable grades. The resulting local distribution of induction components indicates maximum values of TD-components in the T-joint region and the adjoining yoke regions corresponding to maximum rotational magnetization. In comparison with experimental findings, the results of modelling show similar tendencies. However, as a specific advantage of MACC-modelling, it allows flexible and rapid checks of consequences of changes of material parameters and geometric parameters, respectively. Show more

Keywords: Numerical magnetic modelling, electric equivalence circuits, transformer cores, induction distribution, rotational magnetization, non-linear systems

DOI: 10.3233/JAE-150072

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 81-95, 2016

Authors: Huang, Chengguang | Wu, Feng | Zhao, Jin | Zhou, Dehong

Article Type: Research Article

Abstract: This paper presents a novel single and multiple open circuit fault detection and identification method for three phase Voltage Source Inverter (VSI) fed vector controlled drives. In healthy condition, d-axis reference voltage is constant. When fault occurs, it is distorted, which is applied to detect the insulated-gate bipolar transistors (IGBTs) open circuit fault occurrence. The d-axis reference voltage distorted last for an interval time, the fault can be isolated by calculating the instant current vector rotating angles when the d-axis reference voltage gets distorted and recovered to constant, respectively, combined with space position of the current arc trajectory. The proposed …method is fair robust to load torque changes and variable speed, and can be embedded into the existing drive software as a subroutine without excessive computational effort. The feasibility of the proposed fault diagnosis algorithm is evaluated by both simulation and experimental results. Show more

Keywords: PWM voltage-source-inverter, induction motor drives, inverter, open-circuit, fault diagnosis

DOI: 10.3233/JAE-150073

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 97-111, 2016

Authors: Liu, Shuang | Liu, Jinjie | Wu, Zheng | Li, Jianxiong

Article Type: Research Article

Abstract: Bifurcation control for electromechanical coupling torsional vibration in rolling mill system driven by DC motor is studied in this paper. Considering the electromechanical devices under unsaturated magnetic circuit, the dynamical equation of electromechanical coupling vibration in rolling mill drive system is deduced by using the dissipation Lagrange equation. Analysing the system equilibrium point and characteristic roots. Choosing the torsional rigidity of rotating shaft as a bifurcation parameter and the necessary and sufficient conditions of Hopf bifurcation are given. The bifurcation characteristics of the system is investigated and the Washout filter is adopted to control the Hopf bifurcation, then the effect …of the filter's time constant and the linear gain on the location of bifurcation point is analyzed. The Normal Form factor is obtained by using the Direct Normal Form method. It is revealed that, the nonlinear gain can modify the periodic solution's amplitude and Hopf bifurcation type. Numerical simulations are also performed, which confirm the analytical results. Show more

Keywords: Main drive system of rolling mill, electromechanical coupling, Hopf bifurcation, Washout filter, Normal Form

DOI: 10.3233/JAE-150083

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 113-125, 2016

Authors: Mahmoud, Imed | Rehaoulia, Habib

Article Type: Research Article

Abstract: The present paper deals with design, modelling and characteristics of a biomedical system. The involved biomedical system is a syringe pump generally used for continuous drug infusion. The syringe pump consists of a linear switched reluctance motor (LSRM) coupled to a syringe plunger. In order to determine the axial force to control the syringe plunger, it was necessary to begin by evaluating the thrust force. For that purpose, an analytical approach is developed to evaluate the different forces and pressures involved. In addition, an experimental bench was conceived to determine the thrust force and validate the analytical model of the …syringe. Consequent results constituted the key element for designing and modelling the LSRM with the help of finite element methods (FEM). The final step is reserved to predict the dynamic performances of all the biomedical system with and without saturation. Show more

Keywords: Linear switched reluctance motor, syringe pump, modeling, finite-element methods and dynamic performances

DOI: 10.3233/JAE-150085

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 50, no. 1, pp. 127-143, 2016