OPTIMIZATION OF THE ELECTRON BEAM INPUT MODE DURING WELDING OF THE THIN-WALLED STRUCTURES

2020 ◽  
pp. 64-67
Author(s):  
В.С. Тынченко ◽  
С.О. Курашкин ◽  
Д.В. Рогова
Keyword(s):  
Mathematical Model ◽  
Electron Beam ◽  
Steady State ◽  
Energy Distribution ◽  
Minimum Time ◽  
Efficient Energy ◽  
Thin Walled Structures ◽  
Input Mode ◽  
Thin Walled ◽  
Technological Mode

В статье рассматривается проблема оптимизации режима ввода электронного луча при сварке тонкостенных конструкций. Предлагается математическая модель позволяющая формировать технологический режим ввода луча с минимальным временем выхода процесса на установившейся режим и максимально эффективным распределением энергии. Optimization of the electron beam input mode during welding of the thin-walled structures The article deals with the problem of optimizing the mode of electron-beam input when welding thin-walled structures. A mathematical model is proposed that allows the formation of a technological mode of beam input with a minimum time for the process to reach a steady state and the most efficient energy distribution.

scholarly journals Mathematical models of beam input and output in the process of electron beam welding of thin-walled structures

2020 ◽  
Vol 1515 ◽  
pp. 052048
Author(s):  
S O Kurashkin ◽  
V S Tynchenko ◽  
Yu N Seregin ◽  
V E Petrenko ◽  
A V Milov ◽  
...  
Keyword(s):  
Electron Beam ◽  
Mathematical Models ◽  
Electron Beam Welding ◽  
Thin Walled Structures ◽  
Input And Output ◽  
Thin Walled

scholarly journals Pressure distribution of a horizontal well in a bounded reservoir with constant pressure top and bottom

2020 ◽  
Vol 39 (1) ◽  
pp. 154-160
Author(s):  
J.J. Orene ◽  
E.S. Adewole
Keyword(s):  
Mathematical Model ◽  
Steady State ◽  
Pressure Distribution ◽  
Horizontal Well ◽  
Constant Pressure ◽  
Horizontal Wells ◽  
Minimum Time ◽  
Pressure Derivative ◽  
Dimensionless Pressure ◽  
Lateral Extent

The purpose of this study is to develop a mathematical model using Source and Green’s functions for a Horizontal Wells in a Bounded Reservoir with Constant Pressure at the Top and Bottom for the interpretation of pressure responses in the reservoir based on dimensionless pressure and pressure derivative. Reservoir and well parameters investigated revealed what sets of reservoir/ well parameters combination that will prolong infinite activity of the reservoir before steady state sets in. Results show that dimensionless lateral extent does not directly affect the dimensionless pressure and dimensionless pressure derivative for very short well lengths as used in this paper. Dimensionless pressure increases with reservoir pay thickness and delay the time for steady state conditions. In fact external fluid invasion is strongly affected by the size of the pay thickness, thus the minimum time for steady state period to set in is according to the relation TD ≥ LD/5. Keywords: Bounded, reservoir, steady-state conditions, horizontal well, constant pressure.

Dynamic Stability of Monosymmetrical Thin-Walled Structures

1972 ◽  
Vol 39 (4) ◽  
pp. 1055-1059 ◽  
Author(s):  
A. A. Ghobarah
Keyword(s):  
Steady State ◽  
Dynamic Stability ◽  
Nonlinear Differential Equations ◽  
Parametric Instability ◽  
Split Ring ◽  
State Response ◽  
Thin Walled Structures ◽  
Ring Section ◽  
Thin Walled ◽  
Energy Formulation

A study is made on the dynamic stability of thin-walled beams of monosymmetrical cross section. Under the action of axial periodic loads, the parametric excitation of the coupled flexural-torsional type of vibrations is investigated. The nonlinear differential equations and the appropriate boundary conditions used in the analysis of the problem were obtained using the energy formulation. The effect of large angles of rotation and the effect of longitudinal deformations were taken into account. The parametric stability of a thin-walled beam of monosymmetrical split ring section is studied. The study included the establishment of the regions of parametric instability. The steady-state response and the transient growth of the amplitude of oscillations are investigated when the system is parametrically excited. Attention is focused on the response when the coupled flexural-torsional type of vibrations of predominant torsional characteristics is excited. The effect of viscous damping on the steady-state and the transient responses is also included in the analysis.

Automation of Electron Beam Input During the Welding of Thin-Walled Structures

2021 ◽  
pp. 88-99
Author(s):  
Vadim Tynchenko ◽  
Sergei Kurashkin ◽  
Valeriya Tynchenko ◽  
Sergei Dokshanin ◽  
Anna Leonteva
Keyword(s):  
Electron Beam ◽  
Thin Walled Structures ◽  
Thin Walled

Properties of Twofold Tape Loops: The Influence of the Subtended Angle

2019 ◽  
Vol 11 (2) ◽  
Author(s):  
Marinus G. de Jong ◽  
Werner W. P. J. van de Sande ◽  
Just L. Herder
Keyword(s):  
Energy Distribution ◽  
Cross Section ◽  
Energy State ◽  
Linear Guide ◽  
Curvature Analysis ◽  
Transverse Curvature ◽  
Thin Walled Structures ◽  
Constant Radius ◽  
Thin Walled ◽  
Key Aspects

Tape springs are thin-walled structures with zero longitudinal and constant transverse curvature. Folding them twice and connecting both ends creates a tape loop which acts as a linear guide. At this time, there is insufficient understanding of the influence of the tape spring's cross section on its behavior. This study investigates the influence of the subtended angle on the tape spring's behavior, especially the energy distribution and the fold radius. First, some key aspects in the design of a twofold tape loop are discussed. By performing a curvature analysis of this folded geometry, the different regions within a tape spring are identified. This information is used to identify the influence of the subtended angle on the geometry and energy state of the tape loop. The fold radius and fold angle are determined by analyzing the geometry of the fold region. The analysis showed that the energy within the transition regions cannot be neglected. The energy within these regions and the length of the transition regions both increase with the subtended angle. It is also shown that the fold radius is not constant when the subtended angle is small. The subtended angle should be above 100 deg to ensure a constant radius.

Energy Distribution in Electron Beams

1972 ◽  
Vol 30 ◽  
pp. 568-569
Author(s):  
Tamotsu Ohno
Keyword(s):  
Electron Beam ◽  
Energy Distribution ◽  
Cross Section ◽  
Integral Curve ◽  
Electron Beams ◽  
Electron Gun ◽  
Angular Divergence ◽  
Apparent Increase ◽  
Integral Width ◽  
The Cross

The energy distribution in an electron; beam from an electron gun provided with a biased Wehnelt cylinder was measured by a retarding potential analyser. All the measurements were carried out with a beam of small angular divergence (<3xl0-4 rad) to eliminate the apparent increase of energy width as pointed out by Ichinokawa.The cross section of the beam from a gun with a tungsten hairpin cathode varies as shown in Fig.1a with the bias voltage Vg. The central part of the beam was analysed. An example of the integral curve as well as the energy spectrum is shown in Fig.2. The integral width of the spectrum ΔEi varies with Vg as shown in Fig.1b The width ΔEi is smaller than the Maxwellian width near the cut-off. As |Vg| is decreased, ΔEi increases beyond the Maxwellian width, reaches a maximum and then decreases. Note that the cross section of the beam enlarges with decreasing |Vg|.

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