Scattering by linearly vibrating objects

Kleinman, R. E.; Mack, Richard B.

doi:10.1109/tap.1979.1142085

Cited by 53 publications

(24 citation statements)

References 3 publications

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“…Researchers who have made efforts for analytical solutions or mathematical expressions for such problems rarely have decent results in return. Since early 1950s, many researchers have been studying the scattered EM fields from various objects undergoing different types of motion [4][5][6][7][8][9][10]. The role of numerical techniques becomes more and more significant as most nonlinear and complicated problems can be mathematically modeled and numerically solved.…”

Section: Introductionmentioning

confidence: 99%

Em Fields Inside a Rotating Circular Hollow Dielectric Cylinder: Numerical Simulation in 2ds

Ho¹,

Tsai²,

Tsai³

2016

PIER M

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Abstract-The electromagnetic (EM) fields inside a rotating circular hollow dielectric cylinder were numerically calculated in two dimensions, and the numerical results were presented in this paper. The simulation was carried out by using the method of characteristics (MOC) for the solutions of the time-domain Maxwell equations with the application of the passing center swing back grids (PCSBG) technique in the modified O-type grid system. To illustrate the effects of the rotating hollow dielectric cylinder on the EM fields inside the cylinder, the cylinder may be set to rotate at impractically, extremely high angular frequencies. The use of PCSBG is to overcome the difficulty of the deformed grid cells resulting from the rotating object while the modified O-type grid system satisfies the requirement of minimum number of grid within the shortest wavelength of interest in the larger radius regions where the regular O-type grid fails. A Gaussian EM pulse is utilized as excitation source and set to illuminate the hollow cylinder which is made of either non-magnetic or impedance matching materials. For clear examinations the numerical results of EM fields at and around the cylinder center are exhibited. Several electric field distributions are also shown.

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Section: Introductionmentioning

confidence: 99%

Em Fields Inside a Rotating Circular Hollow Dielectric Cylinder: Numerical Simulation in 2ds

Ho¹,

Tsai²,

Tsai³

2016

PIER M

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“…Most of the time, such efforts typically end up in vain. Since the 1970s, many researchers have been making efforts in the study of scattered EM waves from uniformly moving or vibrating mirrors; some developed various theories while others worked on numerical solutions [3][4][5][6][7][8][9]. It is obvious that the role of numerical techniques becomes more and more important because many nonlinear and intricate problems can be numerically solved as well as because of the tremendous advance of computing power in both hardware and algorithm.…”

Section: Introductionmentioning

confidence: 99%

Radiated Em Fields From a Rotating Current-Carrying Circular Cylinder: 2-Dimensional Numerical Simulation

Ho¹,

Lai²,

Chen³

et al. 2011

PIER M

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Abstract-The radiated electromagnetic (EM) fields from a rotating current-carrying circular cylinder were numerically simulated in two dimensions using the method of characteristics (MOC), and the numerical results were presented in this paper. To overcome the difficulty of the grid cell distortion caused by the rotating cylinder, the passing center swing back grids (PCSBG) technique is employed in collaboration of MOC in a modified O-type grid system. In order to have clear demonstration of radiated EM fields, the circular cylinder is set to be evenly divided in radial direction into an even number of slices that are made of perfect electric conductor (PEC) and nonelectric nonmagnetic material, alternatively. The surface current is assumed to have a Gaussian profile and to flow uniformly along the axial direction on the PEC surface. The radiated electric and magnetic fields around the cylinder were recorded as functions of time and reported along with the corresponding spectra which were obtained through proper Fourier transformation. Several field distributions over the whole computational space are also given.

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“…There have been many studies investigating this issue. Some studies focus on the derivation of the theoretical solutions for the EM scattering by perfect conductors in uniform translational motion [1][2][3][4][5][6][7][8][9][10][11], some on the EM scattering by linearly vibrating objects [12][13][14], some on the simulation of the scattered EM fields from perfect planes moving and vibrating [15][16][17], and one on a moving dielectric half-space [18]. Among them, Harfoush et al provided computational results, in addition to the theoretical analysis, by using the finite-difference time-domain (FDTD) technique, in which both Faraday's and Ampere's laws were employed as aides to respectively approximate the magnetic and electric fields immediately next to the moving surface whenever the surface travels away from the grid point [3].…”

Section: Introductionmentioning

confidence: 99%

Simulation of Scattered Em Fields From Rotating Cylinder Using Passing Center Swing Back Grids Technique in Two Dimensions

Ho¹

2009

PIER

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Abstract-In this paper, a new numerical technique, passing center swing back grids (PCSBG's) for the resolution of the grid distortion difficulty due to the rotational motion of objects is introduced. This proposed swing-back-grids approach alongside of the method of characteristics (MOC) is developed to solve EM scattering problems featured with rotating objects. The feasibility of such combination is apparent from the fact that MOC defines all field quantities in the centroid of the grid cell. The scattered EM fields from a rotating circular cylinder under the excitation of an EM pulse are predicted in two dimensions and the electric field distributions recorded at several time instances are demonstrated. In order to confirm that the cylinder is rotating and scattering EM fields simultaneously, the circular cylinder is uniformly divided into an even number of slices with one perfect reflector and one non-reflector alternatively since a rotating circular cylinder causes no relativistic effects.

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Scattering by linearly vibrating objects

Cited by 53 publications

References 3 publications

Em Fields Inside a Rotating Circular Hollow Dielectric Cylinder: Numerical Simulation in 2ds

Em Fields Inside a Rotating Circular Hollow Dielectric Cylinder: Numerical Simulation in 2ds

Radiated Em Fields From a Rotating Current-Carrying Circular Cylinder: 2-Dimensional Numerical Simulation

Simulation of Scattered Em Fields From Rotating Cylinder Using Passing Center Swing Back Grids Technique in Two Dimensions

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