4bcc23ec-293e-4d3e-8539-b6f8b20e15e020210319101531016naunmdt@crossref.orgMDT DepositInternational Journal of Applied Mathematics and Informatics2074-127810.46300/91014http://www.naun.org/cms.action?id=3064319202131920211510.46300/91014.2021.15https://www.naun.org/cms.action?id=23306Yvon GardanCresticUrca (Reims University), Reims, FranceNicolasGardanDINCCS, MICADO, Charleville-Mézières, FranceThe linear process of design-engineeringmanufacturing is nowadays obsolete. Even DFX (Design For X) methodologies are often replaced by Simulation for XFD (X being also Design) approaches. Optimization is also often applied before design. For instance, engineering design optimization of mechanical structures is nowadays essential in the mechanical industry (automotive, aeronautics ...). But optimizing mechanical structures cannot be efficient without taking in account other phases of the design-manufacturing process. In some cases, optimization is only based on trade kwnowledge. Engineers must then design parts or assemblies that are a better compromise, between mechanical and functional performance, weight, manufacturing costs etc. In this paper, after giving an overview on the different disciplines in design optimization of mechanical structures, we propose some trends to take into account the trade knowledge in the optimization/design phases. We propose an integrated approach to optimization in a functional design process with a methodological point of view. We present three different industrial cases of optimization on three examples : one in mechanical structures optimization, on based only on trade knowledge and the third mixing calculus and knowledge31920213192021713https://www.naun.org/main/UPress/ami/2021/a042013-002(2021).pdf10.46300/91014.2021.15.2https://www.naun.org/main/UPress/ami/2021/a042013-002(2021).pdf10.1080/10426918608953170Madux, K. C., Jain, S.C. "CAE for the manufacturing engineer: the role of process simulation in concurrent engineering", Manufacturing Simulation and Processes, ASME, 20, 1-15, 1986 10.1016/0142-694x(95)00021-iSharpe, J.E.E. "Computer Tools for Integrated Conceptual Design ", Design Studies, 16(4), 471-488, 1995 Yvon Gardan, Anthony Lerouge, Nicolas Gardan, and Elvis Kwassi. "A methodology to optimize design : fundamentals and case study". the 13th International conference on Mathematical and computational methods 10.1016/j.cirp.2008.09.007Roy, R., Hinduja, S., Teti, R., "Recent advances in engineering design optimization: Challenges and future trends", CIRP Annals, Manufacturing technology, 2008 10.1016/j.compind.2007.06.013Danesi, F. Gardan, N. Gardan Y. Reimeringer, M. "P4LM: A methodology for product lifecycle management", Computers in Industry 59 (2008) 304-317 Arora, J., Introduction to Optimum Design, McGraw-Hill, 1989. Bendsoe, M. P., Sigmund, O., Topology Optimization, Theory, Methods and Applications, Springer, 2003 Haftka, R. T., Guerdal, Z., Elements of Structural Optimization, Kluwer Academic Publishers, 1996. Marcelin, J. L., "Optimisation des structures et d'éléments mécaniques", Cépaduès, Toulouse, 2006 N. Gardan, M. Reimeringer, F. Danesi, Y. Gardan "Graphonumerical parameters: collaborative parameters based on scenarios and ontologies " Proceedings of the PLM07, 11-13 Juillet 2007, KilometroRosso, Italie 10.1016/s0957-4174(03)00096-4Nicolas Gardan, Yvon Gardan "An application of knowledge based modelling using scripts ", Expert Systems With Applications, Pergamon press, Elsevier Science Ltd., Volume 25, Issue 4, November 2003, Pages 555-568 Michael Reimeringer, Nicolas Gardan, Yvon Gardan, Hassan Ugur "CADFORSIM : Rules to improve the mesh quality" –– Proceedings of the TMCE 2008, April 21-25, 2008, Izmir, Turkey 10.1109/cgiv.2007.43E. Brosse, Y. Gardan, E. Perrin - "Forging-dedicated CAD: how getting forging preform by using trade knowledge and feature reorganization" 4th International Conference Computer Graphics, Imaging and Visualization 14, 15 - 17 August 2007 • Bangkok • Thailand, 2007 Nicolas Gardan, Alexandre Schneider, "Topological optimization of internal patterns and support in additive manufacturing" - unpublished