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Analyse de sensibilité 3D par la méthode de l'état adjoint : application au forgeage

Abstract : The 3D sensitivity analysis in forging, purpose of this work, deals with computing the gradient of several objective functions with respect to parameters . This gradient is a very useful tool because the user, using this information, knows how to modify the parameters in order to obtain an optimal forging process.
Different sensitivity analysis techniques can be used. We have chosen the adjoint state method because its cost does not depend on the number of parameters. During the implementation of the adjoint state method in the FORGE3® software, we have studied three major points :
- storing data in order to compute backwardly the adjoint sensitivities
- differentiation of the unilateral contact condition
- treatment of remeshing and transfer of data
Several applications to academic examples are performed, the goal is to verify the accuracy of the adjoint sensitivities. Moreover, the computational time and the memory space required by the adjoint state method are quite acceptable.
Finally, a gear forging problem proposed by ASCOFORGE company is handled. The first optimisation results are very encouraging. Then, there is no major obstacle to apply the adjoint state differentiation method to large industrial 3D problems.
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Submitted on : Monday, April 5, 2004 - 5:59:09 PM
Last modification on : Thursday, September 24, 2020 - 5:22:54 PM
Long-term archiving on: : Wednesday, September 12, 2012 - 3:20:11 PM

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  • HAL Id : tel-00005755, version 1

Citation

Mehdi Laroussi. Analyse de sensibilité 3D par la méthode de l'état adjoint : application au forgeage. Mécanique [physics.med-ph]. École Nationale Supérieure des Mines de Paris, 2003. Français. ⟨tel-00005755⟩

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