References of "Bayatfar, Abbas"
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See detailOptimisation Methodology Applied to Ship Design
Amrane, Amirouche ULg; Bayatfar, Abbas ULg; Rigo, Philippe ULg

in Practical Design of Ships and Other Floating Structures, CECO 20-25 October 2013 (2013, October)

Optimization with mathematical algorithms can be very helpful to find the best solution (minimum weight, minimum cost, maximum inertia, …). Typically, finite element analysis (FEA) tools are used in ship ... [more ▼]

Optimization with mathematical algorithms can be very helpful to find the best solution (minimum weight, minimum cost, maximum inertia, …). Typically, finite element analysis (FEA) tools are used in ship structural assessment. But, to build a FEM model from a CAD one is not easy and needs a big amount of manual work. This paper presents an innovative optimization workflow by which the following steps are automatically carried out, without any manual intervention. First, from the 3D CAD model, an idealized CAD model is created by the idealization module to take into account the FEM needs. Then, the idealized CAD model is transferred to the FEM tool. After that, the FEM model is meshed, loaded and solved. The obtained results (stress, volume etc.) are transferred to the optimizer. The optimizer evaluates the values of the objective function and the constraints previously defined and modify the design variables (plate thickness and the stiffener scantling) to create a new structural model. After several iterations, the optimum solution is evaluated. [less ▲]

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See detailAn Optimisation Methodology for Ship Structural Design using CAD/FEM Integration
Amrane, Amirouche ULg; Bayatfar, Abbas ULg; Rigo, Philippe ULg

in 12th International Conference on Computer and IT Applications in the Maritime Industries, COMPIT’13, Cortona 15-17 April 2013 (2013, April)

In ship structural design, scantling optimisation using mathematical algorithms is not yet largely implemented in industry. Optimisation with mathematical algorithms can be very helpful to find the best ... [more ▼]

In ship structural design, scantling optimisation using mathematical algorithms is not yet largely implemented in industry. Optimisation with mathematical algorithms can be very helpful to find the best solution (minimum weight, minimum cost, maximum inertia,etc.). Typically, finite element analysis (FEA) tools are used in ship structural assessment. But, to build a FEM model from a CAD one is not easy. It needs a big amount of manual work. In the present work, an innovative optimisation workflow was developed. The following steps are carried automatically without any manual intervention. First, from the 3D CAD model, an idealized CAD model is created by the idealization module to take into account the FEM needs. Then, the idealized CAD model is transferred to the FEM tool. After that, the FEM model is meshed and loaded. After FEM solving, the results (stress, displacement, volume etc.) are transferred to the optimiser. The optimiser evaluates the values of the objective function and the constraints previously defined and modify the design variables (plate thickness and the stiffener scantling) to create a new structural model. After several iterations, the optimum solution is evaluated. [less ▲]

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See detailULTIMATE STRENGTH ANALYSIS OF STEEL PLATES USING ISO/DIS 1872-2 AND ULSAP
Nguyen, Tien dung; Rigo, Philippe ULg; Bayatfar, Abbas ULg

in Nguyen Thien Tong (Ed.) International Conference on Advances in Computational Mechanics (2012, August)

Ultimate limit states (or ultimate strength) have been assessed that is the much better basis than the allowable working stresses. Today, we design and strength assessment the structural types such as ... [more ▼]

Ultimate limit states (or ultimate strength) have been assessed that is the much better basis than the allowable working stresses. Today, we design and strength assessment the structural types such as aerospace structures, offshore platforms, ships and land-based structures following the ISO STANDARD. Aim of this paper is to perform benchmark calculation in order to validating formulas of ISO Standard [1]. An effective approach for plate, using the ISO/DIS 1872-2 standard [1] and ULSAP (Mestro software) [2], are calculated in the current research for studying the ultimate strength problems of plates with six load cases: longitudinal compression, transverse compression, biaxial compression with/without lateral pressure. The trends of ISO Standard results in some cases agree well to the Maestro results. Other cases are not similar. The values of ISO results were found smaller than Maestro results. For this reason, the ISO results are not more conservative than ULSAP results. [less ▲]

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