scholarly journals Exciters of scalar modes of a circular waveguide.

2021 ◽  
Vol 2021 (5) ◽  
Author(s):  
V.A. Kaloshin ◽  
◽  
Van Chung Pham ◽  
Keyword(s):  
Finite Element ◽  
Time Domain ◽  
Finite Differences ◽  
Circular Waveguide ◽  
Optimization Of Parameters ◽  
Simulation And Optimization ◽  
Metal Waveguide

Various options for constructing broadband exciters ТМ01and ТЕ01 modes of a circular metal waveguide have been proposed and investigated. Electrodynamic simulation and optimization of parameters were carried out using finite element and finite differences in time domain methods.

scholarly journals Radiators of scalar modes of a circular waveguide.

2021 ◽  
Author(s):  
V.A. Kaloshin ◽  
◽  
Van Chung Pham ◽  
E.V. Frolova ◽  
◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Time Domain ◽  
Circular Waveguide ◽  
Dielectric Plate ◽  
Optimization Of Parameters ◽  
Anisotropic Dielectric ◽  
Simulation And Optimization ◽  
Metal Waveguide ◽  
Cylindrical Mirror

The frequency characteristics of the radiators of ТМ01 and ТЕ01modes of a circular metal waveguide are investigated. Radiators in the form of an open end of a circular waveguide with a stepped cut, including those with a cylindrical mirror, as well as an open end of a waveguide with an inhomogeneous anisotropic dielectric plate are considered. Numerical simulation and optimization of parameters were carried out using finite element and finite differences in time domain methods.

Design and Analysis of Viscoelastic Seismic Dampers

2002 ◽  
Author(s):  
N. Shimizu ◽  
H. Nasuno ◽  
T. Yazaki ◽  
K. Sunakoda
Keyword(s):  
Finite Element ◽  
Constitutive Relation ◽  
Time Domain ◽  
Dynamic Properties ◽  
Design Procedure ◽  
Fe Analysis ◽  
Damping Capacity ◽  
Element Formulation ◽  
Element Analysis ◽  
Equivalent Viscous Damping

This paper describes a methodology of design and analysis of viscoelastic seismic dampers by means of the time domain finite element analysis. The viscoelastic constitutive relation of material incorporating with the fractional calculus has been derived and the finite element formulation based on the constitutive relation has been developed to analyze the dynamic property of seismic damper. A time domain computer program was developed by using the formulation. Dynamic properties of hysteresis loop, damping capacity, equivalent viscous damping coefficient, and equivalent spring constant are calculated and compared with the experimental results. Remarkable correlation between the FE analysis and the experiment is gained, and consequently the design procedure with the help of the FE analysis has been established.

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