Rapid coupling optimization method for a tube hydroforming process

Chebbah, M. S.; Naceur, Hakim; Hecini, Mabrouk

doi:10.1243/09544054jem1607

Cited by 14 publications

(11 citation statements)

References 19 publications

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“…In this paper, the approximation is computed by using the evaluation points obtained considering CCD technique. The response surfaces are built using Moving Least Squares (MLS) approximations based on DA and constructed within a moving region of interest [7]. The DA method was developed initially by Nayroles et al [8], the approximating functions are polynomials fitted to the nodal values of each local domain by a weighted least-squares approximation.…”

Section: Optimization Proceduresmentioning

confidence: 99%

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Geometrical parameters optimization for tube hydroforming using response surface method

Chebbah

Azaouzi²

2014

AIP Conference Proceedings

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In tube hydroforming (THF) the optimal thickness variation of a product is influenced by the geometrical, material and process parameters. In this study different values of initial tube length combined with various fillet and entry radii of the die are taken into account to predict an acceptable T-shaped tube of which the minimum wall thickness fulfills the industrial demand. To reach this goal, an integrated optimization approach, using the classical explicit dynamic (ED) incremental approach using ABAQUS ® commercial code together with an optimization algorithm was developed. This latter consists in constructing an explicit form of the objective function by response surface methodology (RSM) based on diffuse approximation (DA) according to the design variables. To search the global optimum of the objective function, the sequential quadratic programming (SQP) algorithm has been used.

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Section: Optimization Proceduresmentioning

confidence: 99%

“…Different weighting functions have been proposed in the literature, they differ in both the shape of the domain of influence, and in functional form. In this work the truncated Gaussian spherical weight function [7] is used.…”

Section: Optimization Proceduresmentioning

confidence: 99%

Geometrical parameters optimization for tube hydroforming using response surface method

Chebbah

Azaouzi²

2014

AIP Conference Proceedings

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“…1–3 An imperative issue in the case of multidisciplinary design and optimization is to address the unavoidable couplings among these disciplines. 4–6 Thus, the complex couplings and dependencies should be considered to get the optimal solutions during the process of complex system design. 7–9 With the requirements of high computational precision for highly complex design problems, the traditional theories of complex system design have evident limitations as they have no consideration of interdisciplinary couplings.…”

Section: Introductionmentioning

confidence: 99%

A serialization-based partial decoupling approach for multidisciplinary design optimization of complex systems

Yuan

Liu

Wang

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part B:

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The optimization for multidisciplinary engineering systems is highly complicated, which involves the decomposing of a system into several individual disciplinary subsystems for obtaining optimal solutions. Managing the coupling between subsystems remains a great challenge for global optimization as the existing methods involve inefficient iterative solving processes and thus have higher time cost. Some strategies such as discipline reorder, coupling suspension and coupling ignoring can to some extent reduce the execution cost. However, there are still some deficiencies for these approaches such as uniform handling of the couplings, complete decoupling and heavy burden of system optimizer. To overcome the above drawbacks, a serialization-based partial decoupling approach is proposed in this study, which consists of three main steps. First, different disciplines are clustered into some subsystems by analyzing the interdisciplinary sensitivities. Then, for each subsystem, a serialization process is proposed to ensure no coupling loops exist and the subsystem can be solved with no iteration, which can reduce the time cost for solving the disciplinary problem to a large degree. Finally, a local optimization model is constructed for each subsystem to maintain the scale of the global optimizer and ensure mutual independence and parallel processing. The proposed three-layer framework ensures the feasibility of solving for each subsystem and improves the efficiency of optimization execution. Several experiments have been conducted to demonstrate the effectiveness and feasibility of the proposed approach.

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“…They obtained optimal pressure loading paths for AA6061 aluminum alloy tubes with different wall thicknesses and corner fillets. Chebbah et al 3 studied on optimization of tube hydroforming parameters to reduce defects that may occur at the end of the forming process such as necking and wrinkling. A specific methodology was proposed based on the coupling between an inverse finite-element model for the rapid simulation of the tube hydroforming process and a response surface method based on diffuse approximation.…”

Section: Introductionmentioning

confidence: 99%

Contraction process of the circular tubes on the conical die: Theory and experiment

Siyahpoosh

Niknejad

2014

Proceedings of the Institution of Mechanical Engineers, Part B:

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A new theoretical model of plastic behavior of circular metal tubes during the contraction process as a metal forming and energy absorber processes is presented in this study. Some theoretical relations are developed to predict the axial load versus the axial displacement of the contraction process, based on the theoretical model. Some quasi-static experiments were performed on circular aluminum and brazen tubes to validate the theoretical analysis. In this research, effects of tube radius, contraction ratio, tube wall thickness and angle of conical die on energy absorption characteristics of circular tubes under axial quasi-static loading are investigated by the experimental and theoretical methods. Results show that there is an admissible agreement between the theoretical results and experimental measurements. Experimental results show that there is a steady force during the end zone of the process which is an important factor in viewpoint of the energy absorption. Also, the steady force increases by increment of die semi-angle, tube radius, friction coefficient and the contraction ratio.

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Rapid coupling optimization method for a tube hydroforming process

Cited by 14 publications

References 19 publications

Geometrical parameters optimization for tube hydroforming using response surface method

Geometrical parameters optimization for tube hydroforming using response surface method

A serialization-based partial decoupling approach for multidisciplinary design optimization of complex systems

Contraction process of the circular tubes on the conical die: Theory and experiment

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