Scattering of electromagnetic waves by arrays of ferrite cylindrical shells

1988 ◽  
Vol 66 (12) ◽  
pp. 1106-1114 ◽  
Author(s):  
M. Z. El-Gamal ◽  
L. Shafai
Keyword(s):  
Present Method ◽  
Electromagnetic Waves ◽  
Perturbation Technique ◽  
Cylindrical Shells ◽  
Antenna Gain ◽  
Shell Wall ◽  
Point Matching ◽  
Dc Magnetic Field ◽  
Matching Technique ◽  
Shell Wall Thickness

A method is developed that enables the solution of scattering by a finite number of cylindrical shells in a simple and accurate form. It is based on the analytical formulation using the boundary-value problem and a utilization of a point-matching technique. The method is then applied to study the effect of the shell-wall thickness as well as the effect of the applied dc magnetic field on the scattering properties of arrays of infinite anisotropic cylindrical shells. It is also used to determine the size and spacing of passive dielectric and magnetized ferrite reflectors to improve the directivity of antennas. In this latter case, a combination of the present method and a known space-perturbation technique is employed to optimize the antenna gain.

Calculation of gravitational strains and stresses in a solid of revolution by a mixed point-matching technique

1980 ◽  
Vol 15 (2) ◽  
pp. 83-88
Author(s):  
R J De Wilde ◽  
J Clement ◽  
J M Hellemans ◽  
R Boving
Keyword(s):  
Present Method ◽  
Axisymmetric Body ◽  
Matching Method ◽  
Point Matching ◽  
Solid Of Revolution ◽  
Matching Technique ◽  
Elasticity Problems ◽  
Body Load ◽  
Element Technique ◽  
Linear And Nonlinear Elasticity

This paper presents a point-matching method for solving axisymmetric body-load problems. It can be used for both linear and nonlinear elasticity problems. The change of boundary shape and boundary conditions requires only a few program modifications. The validity of each solution is evaluated by error analysis. The present method is compared with a finite-element technique.

scholarly journals Anisotropic Metasurface with Asymmetric Propagation of Electromagnetic Waves and Enhancements of Antenna Gain

IEEE Access ◽  
2021 ◽  
pp. 1-1
Author(s):  
Chia-Chi Chung ◽  
Fei-Peng Lai ◽  
Sheng-Xue Huang ◽  
Yen-Sheng Chen
Keyword(s):  
Electromagnetic Waves ◽  
Antenna Gain

Accurate Calculation of Stress Distributions in Multiholed Plates

1965 ◽  
Vol 87 (3) ◽  
pp. 331-335 ◽  
Author(s):  
L. E. Hulbert ◽  
F. W. Niedenfuhr
Keyword(s):  
Computer Program ◽  
Plane Stress ◽  
Symmetric Groups ◽  
Thin Plates ◽  
Stress Distributions ◽  
Accurate Calculation ◽  
Point Matching ◽  
Shallow Shells ◽  
Matching Technique ◽  
Stress Functions

This paper discusses the application of the point-matching technique in obtaining the solution of many problems involving multiholed thin plates undergoing generalized plane stress. The stress functions appropriate to plates with symmetric groups of holes are described. A large number of problems solved by a computer program are described and compared with published results. Problems are solved also for which there are no known published results. Two interesting new problems are discussed in detail. The results show the power and flexibility of the technique. The extension of the methods to permit the solution of problems in the deflection of thin, multiholed plates and shallow shells is discussed.

Point-matching technique for rectangular-cross-section dielectric rod

1971 ◽  
Vol 7 (17) ◽  
pp. 497 ◽  
Author(s):  
A.L. Cullen ◽  
O. Özkan ◽  
L.A. Jackson
Keyword(s):  
Cross Section ◽  
Rectangular Cross Section ◽  
Point Matching ◽  
Matching Technique

Solution of axisymmetric torsion problems by point matching

1971 ◽  
Vol 6 (2) ◽  
pp. 124-133 ◽  
Author(s):  
G J Matthews ◽  
C J Hooke
Keyword(s):  
Boundary Conditions ◽  
Numerical Technique ◽  
Point Matching ◽  
Analytical Results ◽  
Elasticity Equations ◽  
Matching Technique ◽  
Basic Solutions ◽  
Axisymmetric Bodies

A general numerical technique is presented for the solution of the problem of torsion of axisymmetric bodies. The method superimposes a number of basic solutions of the elasticity equations using the point-matching technique so as to satisfy approximately the prescribed boundary conditions of a body. Results obtained by this technique are compared with those obtained by alternative experimental and theoretical techniques for various body geometries to assess the accuracy of the method. The technique is then applied to the problem of the torsion of shouldered shafts since large discrepancies exist between the experimental and analytical results available for this type of structure.

Calculation of stress-concentration factors for grooved shafts in bending using the point-matching technique

1973 ◽  
Vol 8 (2) ◽  
pp. 113-118 ◽  
Author(s):  
G J Matthews ◽  
C J Hooke
Keyword(s):  
Stress Concentration ◽  
Numerical Technique ◽  
Pure Bending ◽  
Point Matching ◽  
Matching Technique ◽  
Concentration Factors ◽  
Stress Concentration Factors ◽  
Stress Concentration Effect ◽  
Axisymmetric Bodies ◽  
Good Agreement

A general numerical technique is presented for the solution of the problem of elastic bending of axisymmetric bodies. Results obtained by this method are compared with existing results for grooved and shouldered shafts in pure bending and good agreement is obtained in each case. Additional results are presented for the stress-concentration effect of flat-bottomed circumferential grooves in cylindrical shafts for which no experimental or analytical results are available.

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