circular zone
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2020 ◽  
Vol 37 (3) ◽  
pp. 374 ◽  
Author(s):  
Sajid Ali ◽  
Chris Jacobsen
Keyword(s):  

2019 ◽  
Vol 20 (6) ◽  
pp. 616
Author(s):  
Seyed Ehsan Chavoshi ◽  
Seyed Ebrahim Moussavi Torshizi

The spot heating of a metal part leads to many small deformations. The applications of this method are straightening the bridge parts, turbo-machinery shafts, and so forth. The movement of the heat source on a given path (line heating) leads to an increase in the deformation and the possibility of creating complex bends. However, it is complicated to predict and control the path and velocity of the heat source as well as determining the heat intensity. In the pipes, this method requires simultaneous control over the two torches on both sides of the pipe. The present study aims at investigating the mechanism of deformation and increasing the bending angle in thick pipes by means of a simple heating method. At first, the maximum bending in heating a large circular zone (entitled “wide heating”) is obtained by simulating the process using finite element method and optimizing it applying the genetic aggregation algorithm. Then, a new method for simultaneous heating within two zones is introduced. The interaction between two zones leads to the development of the shortening mechanism in the pipe wall and a significant increase in the bending angle. In this method, there is no need to move the torch where the temperature is controlled more accurately. To evaluate the finite element model, several pipe heating tests are performed with their results being agreed well with the simulation results.


2011 ◽  
Author(s):  
A. Firsov ◽  
R. Belkhou ◽  
M. Idir ◽  
A. Svintsov ◽  
S. Zaitsev ◽  
...  
Keyword(s):  
X Rays ◽  

2010 ◽  
Vol 47 (6) ◽  
pp. 11-29 ◽  
Author(s):  
J. Survilo

Rated Power Determination for Medium/Low Voltage TransformersThe power estimation is performed for the medium/low voltage transformer of a low voltage network. The factors to be accounted for in the estimation are the load density and the fed zone shape. From variously shaped fed zones that of hexagonal shape compactly covers a greater territory and has better indices as compared with rectangles and triangles. The study is framed on an apt canonical model - a circular fed zone with constant continuous load density. The model can be used for comparison of indices at the discrete load dislocation in hexagonal or squared fed zones, extending the results obtained for a circular zone using relative ratios. The transformer power is determined by the fed zone radius, which has a natural limit, since the voltage deviation for the farthest consumer should not exceed the allowable value. Under these conditions, optimization can be performed by a given load density, changing the radius of the fed zone and the density of current in phase conductors.


1999 ◽  
Vol 21 (2) ◽  
pp. 198
Author(s):  
Joseph Pegna ◽  
Thierry P. Hilaire ◽  
George Nagy

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