scholarly journals AN ANALYTICAL CALCULATION METHOD OF QUASI-STATIONARY THREE-DIMENSIONAL ELECTROMAGNETIC FIELD CREATED BY THE ARBITRARY CURRENT CONTOUR THAT LOCATED NEAR CONDUCTING BODY

2017 ◽  
Vol 2017 (5) ◽  
pp. 7-17 ◽  
Author(s):  
Yu.M. Vasetsky ◽  
◽  
K.K. Dziuba ◽  
Keyword(s):  
Electromagnetic Field ◽  
Calculation Method ◽  
Three Dimensional ◽  
Analytical Calculation ◽  
Conducting Body

scholarly journals EXACT ANALYTICAL AND APPROXIMATE ASYMPTOTIC CALCULATION METHODS TO DETERMINE THREE-DIMENSIONAL ELECTROMAGNETIC FIELD NEAR CONDUCTING BODY WITH FLAT SURFACE

2021 ◽  
Vol 2021 (4) ◽  
pp. 3-13
Author(s):  
Yu.M. Vasetsky ◽  
Keyword(s):  
Electromagnetic Field ◽  
Approximate Solution ◽  
Flat Surface ◽  
Three Dimensional ◽  
Initial Time ◽  
Time Interval ◽  
Field Problem ◽  
Pulsed Field ◽  
Conducting Body ◽  
Sinusoidal Field

The analytical solution of the three-dimensional quasi-stationary electromagnetic field problem for a current located near conducting body with a flat surface is considered. The exact and approximate solution of the problem is presented. The exact solution has no restrictions on the external field configuration, physical properties of the medium, and frequency. The approximate solution is based on an expansion in asymptotic series and has limitations: for sinusoidal field, the solution is limited to frequencies above the lower limit; for pulsed field, the solution is limited by the initial time interval of the current pulse. Based on comparison of the results of exact and approximate calculations for nonuniform sinusoidal field at the interface between the media, the admissible value of the introduced small parameter is determined. For pulsed field the proposed choice of the limited time interval for calculating electomagnetic field using the asymptotic method is justified. References 29, figures 7.

scholarly journals Composite hollow truss with multiple vierendeel panels

2013 ◽  
Vol 66 (4) ◽  
pp. 431-438
Author(s):  
Augusto Ottoni Bueno da Silva ◽  
Newton de Oliveira Pinto Júnior ◽  
João Alberto Venegas Requena
Keyword(s):  
Bearing Capacity ◽  
Failure Modes ◽  
Three Dimensional ◽  
Analytical Calculation ◽  
Two Dimensional ◽  
Shear Forces ◽  
Vertical Displacements ◽  
New System ◽  
The Ideal

The aim of this study was to evaluate through analytical calculation, two-dimensional elastic modeling, and three-dimensional plastic modeling, the bearing capacity and failure modes of composite hollow trusses bi-supported with a 15 meter span, varying the number of central Vierendeel panels. The study found the proportion span/3 - span/3 - span/3, as the ideal relationship for the truss - Vierendeel - truss lengths, because by increasing the proportion of the length occupied by the central Vierendeel panels, the new system loses stiffness and no longer supports the load stipulated in the project. Furthermore, they can start presenting excessive vertical displacements and insufficient resistance to external shear forces acting on the panels.

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