International Journal of Applied Electromagnetics and Mechanics - Volume 48, issue 4

Authors: Cong, Haoxi | Li, Qingmin | Xing, Jinyuan | Siew, W.H.

Article Type: Research Article

Abstract: An arc chain model of multi-field coupling dynamics integrating the electromagnetic force, the thermal buoyancy force, the wind load force and the air resistance force of the secondary arc is established, and the motion equations of secondary arc for long-distance transmission lines are constructed. In addition, the arc root model is established after depth analysis of the formation and motion mechanism of the arc root, and the method of selecting optimal length of the current element is proposed. The motion trajectory and the arcing time of secondary arc are obtained with the established arc chain model, and the simulation results …are compared with the experimental results to verify the validity of the proposed model. What's more, the arcing time and its dispersion with different wind speed and direction is calculated, and the results showed that the proposed arc model can effectively take into account of the wind influence factor. Finally the electromagnetic force, the thermal buoyancy and the wind load which imposed on the arc are calculated with different secondary current and wind speed, the results show that the wind load force has great influence on the secondary arc and the arc column is affected more greatly by wind than the arc root. Show more

Keywords: Secondary arc, arc chain model, multi-field coupling dynamics, simulation modeling, wind load

DOI: 10.3233/JAE-140191

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 48, no. 4, pp. 423-436, 2015

Authors: Li, Junfeng | Yin, Haibin | Zhong, Guoliang | Wang, Mingpeng

Article Type: Research Article

Abstract: In this paper, a controller based on error and the inverse segmented model, is used to control the position of an SMA actuator. First an inverse model using three segments for both heating and cooling processes is built and experiments are used to validate the model and to identify the parameters. Then a controller, which is based on inverse segmented model and the value of error between the reference and actual displacement, is proposed in the position control process. Furthermore, experimental results demonstrate that the proposed controller performs better than both traditional PID controller and inverse segmented model controller.

Keywords: SMA actuator, inverse hysteresis compensation, tracking control

DOI: 10.3233/JAE-140193

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 48, no. 4, pp. 437-446, 2015

Authors: Lu, Feng | Ma, Yao | Xiong, Run | Duan, Yan-Tao | Su, Li-Yuan

Article Type: Research Article

Abstract: In this paper, uniaxial anisotropic perfectly matched layer (UPML) absorbing boundary condition (ABC) of dispersive materials is presented for 2-D finite-difference time-domain (FDTD) method with weighted Laguerre polynomials (WLP). Taking advantage of the auxiliary differential equation (ADE) technique, our proposed algorithm avoids not only the complicated formulations but also the convolution integral. Using ADE scheme, the relationship between field components and auxiliary differential variables is derived in Laguerre domain. Substituting auxiliary differential variables into UPML-ABC, the electric field E of order q can be expressed directly by magnetic field H in Laguerre domain. Inserting magnetic field …H of order q$ into electric field, and using central difference scheme, the formulations of uniaxial anisotropic dispersive media PML are obtained. One numerical example of wave propagation in 2-D dispersive materials is simulated. Numerical results validate the efficiency of the presented method. Show more

Keywords: Auxiliary differential equation (ADE), finite-difference time-domain (FDTD), perfectly matched layer (PML), uniaxial anisotropic dispersive materials, weighted laguerre polynomials (WLP).

DOI: 10.3233/JAE-140196

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 48, no. 4, pp. 447-457, 2015

Authors: Hossain, M.I. | Faruque, M.R.I. | Islam, M.T.

Article Type: Research Article

Abstract: In this paper, a metamaterial embedded planar inverted-F antenna (PIFA) is proposed for cellular phone. A dual band PIFA is designed to operate both GSM 900 MHz and DCS 1800 MHz. The ground plane of conventional PIFA is modified using a double negative (DNG) metamaterial array. The investigation is performed using the Finite Integration Technique (FIT) of CST Microwave Studio. The specific absorption rate (SAR) values are calculated considering two different holding positions-cheek and tilt. The results indicate that the proposed metamaterial embedded antenna produces lower SAR in the human head compared to conventional PIFA. Moreover, the modified antenna substrate …leads to slight improvement of the antenna performances. Show more

Keywords: Finite integration technique (FIT), planar inverted-F antenna (PIFA), human head model, metamaterial, specific absorption rate (SAR)

DOI: 10.3233/JAE-140201

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 48, no. 4, pp. 459-467, 2015

Authors: Bu, Wenshao | Lu, Chunxiao | Zu, Conglin | Zhang, Haitao | Xiao, Juanya

Article Type: Research Article

Abstract: BLIM, i.e. bearingless induction motor, is a multi-variable, nonlinear and strong coupling object. To achieve its dynamic decoupling control with high performance, a novel dynamic decoupling control strategy is proposed. After analyzing the working principle and mathematical model of BLIM, the state equations based on stator flux orientation are established firstly. On the basis of reversibility analysis of BLIM system, the inverse system dynamic mathematical model based on stator flux orientation is derived. And then, adopting inverse system method, the control system of BLIM is uncoupled to four linear subsystems, including: motor speed subsystem, stator flux-linkage subsystem, and two radial …displacement components subsystems. System simulation results have shown that reliable dynamic decoupling control between relevant variables can be realized, higher static and dynamic control performance can be achieved; in particular, the influence of rotor parameters on the identification precision of motor magnetic flux-linkage can be avoided effectively. The proposed inverse system decoupling control strategy based on stator flux orientation is effective and feasible; a new way has been provided for high performance decoupling control of bearingless induction motor. Show more

Keywords: Three-phase bearingless induction motor, stator flux orientation, model of inverse system, modeling and simulation, decoupling control strategy

DOI: 10.3233/JAE-140202

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 48, no. 4, pp. 469-480, 2015

Article Type: Other

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 48, no. 4, pp. 481-487, 2015