scholarly journals Finite Element Analysis applied to Electromagnetic Forces calculation on Power Transformers

2021 ◽  
Author(s):  
LEONARDO HAUTRIVE MEDEIROS ◽  
GUILHERME MASCHIO ◽  
MICAEL MARCIO OLIVEIRA ◽  
ANTôNIO MARIO KAMINSKI JUNIOR ◽  
DANIELA MAIA BUENO ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Magnetic Core ◽  
Power Transformers ◽  
Element Analysis ◽  
Electromagnetic Forces ◽  
Operation Conditions ◽  
Axial Forces ◽  
Core Column ◽  
High Degree

High electromagnetic forces on power transformers windings may cause the equipment unavailability, resulting in technical and financial losses. To ensure its reliability, transformers must withstand the mechanical stresses demanded by the operation conditions. Once forces measurement and determination have a high degree of complexity, it is needed tools that support forces calculation and analysis accurately. This paper presents the Finite Element Analysis (FEA) applied to determine the electromagnetic forces and its distribution on transformer windings. A complete and close to the practice modeling is done, considering the magnetic core and lateral phases presence in a 3D and 3-phase configuration. The total, radial and axial forces over the windings, as well as its distribution around the core column and along its height are determined on the three phases. With precision and versatility, FEA may be widely applied by industry, contributing for more reliable transformers designs and in cost reduction.

Finite Element Analysis of Multi-Ropes Friction Hoister Main Shaft

2012 ◽  
Vol 538-541 ◽  
pp. 1935-1938 ◽  
Author(s):  
Ming Xia Yan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Structure Design ◽  
Main Shaft ◽  
Three Dimensional Model ◽  
Element Analysis ◽  
Operation Conditions ◽  
The Finite Element Analysis ◽  
Optimal Designing

Three-dimensional model of the main shaft of JKM4×4 hoister was built based on Pro/E. After having applied boundary conditions and loads to the model, the finite element analysis for the main shaft was conducted under extreme operation conditions with ANSYS, the stress and displacement distribution was presented and the stress biggest hazard points were found. Based on the analysis results, improvement methods for the main shaft structure design was given out, which provides references for further optimal designing the main shaft of hoister.

Use of Finite Element Analysis for Stud Pre-Tension Determination of Large Diameter Integral Flanges With Ring Joint Gaskets

2010 ◽  
Author(s):  
Upali Panapitiya ◽  
Haoyu Wang ◽  
Syed Jafri ◽  
Paul Jukes
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Oil And Gas ◽  
Large Diameter ◽  
Three Dimensional ◽  
Oil And Gas Industry ◽  
Element Analysis ◽  
Axial Forces ◽  
Three Dimensional Finite Element

Large diameter integral steel flanges are widely used in many applications in the oil and gas industry. The flanges of nominal pipe sizes, 26-inch and above with ring-joint gaskets as specified in ASME B 16.47 Standard, are used in the offshore applications for the transportation of oil and gas from production facilities. These pipelines require flanged connections at end terminations, mid-line tie-ins and expansion loops. The conventional design of large diameter steel flanges is based on one-dimensional analytical methods similar to the procedure in ASME VIII Boiler and Pressure Vessel Code, Division 1 Appendix 2. The effects of axial forces and bending moments are approximated by calculating an equivalent pressure. This usually results in conservative designs for the large flanges because it estimates the required stud pre-tension based on the assumption that the gasket will be unloaded entirely to a minimum stress, whereas only a small section of the gasket is subjected to low stress. This technical paper presents the quasi-static, nonlinear, and three-dimensional finite element models of large diameter steel flanged joint for the determination of stud pre-tension and change of stud tension under various loading conditions. The finite element analysis results are compared with the results obtained by using the equivalent pressure method and flange “Joint Diagram”.

Analysis and design of laterally unsupported portal frames for out-of-plane stability

2004 ◽  
Vol 31 (3) ◽  
pp. 440-452 ◽  
Author(s):  
Ilian Zinoviev ◽  
Magdi Mohareb
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Potential Energy ◽  
Finite Element Model ◽  
Element Model ◽  
Element Analysis ◽  
Analysis And Design ◽  
Axial Forces ◽  
Eigen Value ◽  
Out Of Plane

A methodology for the analysis and design of laterally unsupported portal frames is proposed. A finite element model is developed to predict the elastic critical load and associated buckling mode. Regression analysis is then conducted to find lateral displacement and rotation field expressions that closely approximate the buckled configurations predicted by the finite element analysis. The obtained functions are then substituted into the total potential energy expression, and the stationarity conditions are evoked. The resulting eigen-value problem is solved for the out-of-plane buckling loads that are then compared with those based on the finite element model. The agreement between the two solutions provides an indication of the accuracy of the simplified energy solution. The member destabilizing effects induced by axial forces are separated from those induced by strong axis bending. The separation of these two effects is subsequently exploited in a two-step eigen-value procedure, aimed at determining the key member resistances defined in the interaction check of the standard CSA-S16-01, while accurately modeling the boundary conditions of the member. These are (i) compressive resistance of the member in the absence of bending effects and (ii) flexural resistance of the member in the absence of axial force effects.Key words: portal frames, lateral buckling, finite element analysis, wide flange sections, frame design, principle of stationary potential energy.

scholarly journals Design and Model Test of a Modularized Prefabricated Steel Frame Structure with Inclined Braces

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Xuechun Liu ◽  
Ailin Zhang ◽  
Jing Ma ◽  
Yongqiang Tan ◽  
Yu Bai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Design Method ◽  
Steel Structures ◽  
Steel Frame ◽  
Frame Structure ◽  
Element Analysis ◽  
High Rise ◽  
High Degree ◽  
Steel Frame Structure

Modularized prefabricated steel structures have become the preferred design in the industrialization of steel structures due to their advantages of fast construction speed, high degree of industrialization, low labour intensity, and more. Prefabricated steel structures have some engineering applications, but all are low-rise structures with few applications in the field of high-rise buildings. Using finite element analysis with line and solid elements, full-scale experiments were conducted to study the single-span frame, which is the core load-bearing part of a modularized prefabricated high-rise steel frame structure with inclined braces. The mechanical mechanisms, computation methods, and design formulas of truss girders were obtained by comparing the finite element and model experiments and building a theoretical and experimental basis for the compilation of design codes. The mechanical characteristics under design load, the deformation and stress state, the elastic-plastic law of development, and the yield failure mode and mechanism under horizontal ultimate load were also obtained. Based on theoretical analysis, finite element analysis, and experiments, the design method of this frame was summarized and incorporated into the design code.

Finite Element Analysis of Three-Phase Three-Limb Power Transformers Under DC Bias

2014 ◽  
Vol 50 (2) ◽  
pp. 565-568 ◽  
Author(s):  
Oszkar Biro ◽  
Gergely Koczka ◽  
Gerald Leber ◽  
Kurt Preis ◽  
Bernhard Wagner
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Power Transformers ◽  
Element Analysis ◽  
Three Phase ◽  
Dc Bias
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