International Journal of Applied Electromagnetics and Mechanics - Volume 32, issue 3

Authors: Yang, Fuqian | An, Linan

Article Type: Research Article

Abstract: The field-assisted sintering techniques have the potential to produce bulk nanostructured materials from micron and submicron particles. Using the perturbation theory, the electrothermal, elastic deformation of a consolidated material has been analyzed. The material carries a uniform, axial electric current. Explicit expression of the temperature and stress fields has been obtained to the first order of approximation. The maximum temperature difference is proportional to the electric energy input to the material, and …the average pressure applied to the pressing die is a nonlinear function of the electric current. Show more

DOI: 10.3233/JAE-2010-1068

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 3, pp. 125-132, 2010

Authors: Andy, A.U. | Abayomi, A.T. | Kennefick, C.M.

Article Type: Research Article

Abstract: Resistance to heat was simulated and measured in a computer model as an annihilation of the elastic stress arising from the electric field in the radiation. The elastic stress created from the electromagnetic wave was superimposed with the elastic stresses produced by the rotation of a grain, which was represented in two dimensions as an ellipse in the simulation. Both the tilt angle of the grain with respect to the applied force and the aspect ratio …of the grain were varied in the computer program. Results are reported here for a ratio of wavelength to total grain length of 10. Annihilation of an elastic stress from the electric field of up to 80 to 90 percent was seen for aspect ratios of 8/7 to 2 in several ranges of grain tilt angle. For this same range in aspect ratio, steep transitions in the amount of annihilation were seen near the ends of the grain. An elongated grain, with an aspect ratio of 10 and rotating counterclockwise, exhibited extinction of 50 to nearly 90 percent of the electric field near the lower end of the grain throughout the tilt angle range of 5° to 85°. Show more

Keywords: Electric field, heat, electromagnetic wave, radiation, elastic stress

DOI: 10.3233/JAE-2010-1072

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 3, pp. 133-143, 2010

Authors: Fujita, Yuya | Kawaguchi, Hideki

Article Type: Research Article

Abstract: Authors have been working in devlopment of the Finite Difference Time Domain (FDTD) / the Finite Integration Technique (FIT) dedicated computer for high performance computation of microwave simulation. Especially the dedicated computer with optimized memory access architecture was proposed to reduce overhead of Neuman bottleneck in FDTD calculation. Based on the optimized memory architecture, dedicated computer was implemented on fully customized Printed Circuit Board (PCB) by using the Field Programable Gate Array …(FPGA) and asynchronous Static Random Access Memory (SRAM). This paper presents a newly developed FDTD/FIT dedicated computer based on Synchronous Dynamic Random Access Memory (SDRAM) for larger scale and higher performance simulation. Show more

DOI: 10.3233/JAE-2010-1073

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 3, pp. 145-157, 2010

Authors: Xiong, Su-Ming | Hou, Peng-Fei | Yang, Shi-You

Article Type: Research Article

Abstract: We use the 2D general solutions of orthotropic electro-magneto-thermo-elastic material to construct the 2D Green's function for a steady line heat source in the interior of two-phase orthotropic electro-magneto-thermo-elastic plane by ten newly introduced harmonic functions with undetermined constants. The corresponding coupled field can be obtained by substituting these functions into the general solution, and the undetermined constants can be obtained by the continuous conditions and equilibrium conditions. All components of coupled …field are expressed in terms of elementary functions and are convenient to use. Show more

Keywords: 2D Green's function, line heat source, two-phase, orthotropic, electro-magneto-thermo-elastic

DOI: 10.3233/JAE-2010-1076

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 3, pp. 159-175, 2010

Authors: Rattan, Munish | Patterh, Manjeet Singh | Sohi, B.S.

Article Type: Research Article

Abstract: The optimization of Yagi-Uda antenna is a subject of continuous research since its invention because of its multimodal pattern and complexity due to the presence of parasitic elements. Particle Swarm Optimization (PSO) is a new, high performance evolutionary technique, which has recently been used for optimization problems in antennas and electromagnetics. In this paper, PSO has been used to simultaneously optimize the gain, front-to-back ratio, input resistance and beamwidth of Yagi-Uda array. The antenna array geometry …with good performance, compared to the results in available literature, has been obtained. Show more

Keywords: Antenna array synthesis, particle swarm optimization

DOI: 10.3233/JAE-2010-1077

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 3, pp. 177-182, 2010

Authors: Andreescu, R. | Spellman, B. | Furlani, E.P.

Article Type: Research Article

Abstract: A non-contact magnetoelastic torque transducer consisting of a non-magnetic shaft with a portion of its length coated with a magnetostrictive material is studied. A phenomenological theory is developed for predicting the magnetic field of the transducer as a function of coating properties, residual strain, and applied torque. This theory takes into account stress-induced anisotropy and variations in magnetoelastic energy within the coating. The resulting model is used to investigate the effect of quiescent stress states on …the sensitivity, hysteresis and linearity. Show more

Keywords: Magnetic torque sensor, non-contact torque sensor, magnetoelastic sensor, magnetostrictive torque sensor

DOI: 10.3233/JAE-2010-1078

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 3, pp. 183-193, 2010