Academic literature on the topic 'Topological Optimisation'
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Journal articles on the topic "Topological Optimisation"
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Almeida, Henrique A., and Paulo J. Bártolo. "Topological Optimisation of Scaffolds for Tissue Engineering." Procedia Engineering 59 (2013): 298–306. http://dx.doi.org/10.1016/j.proeng.2013.05.125.
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Almeida, Henrique de Amorim, and Paulo Jorge da Silva Bártolo. "Virtual topological optimisation of scaffolds for rapid prototyping." Medical Engineering & Physics 32, no. 7 (September 2010): 775–82. http://dx.doi.org/10.1016/j.medengphy.2010.05.001.
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Xie (Mike), Yi Min, Zhi Hao Zuo, Xiaodong Huang, Tim Black, and Peter Felicetti. "Application of Topological Optimisation Technology to Bridge Design." Structural Engineering International 24, no. 2 (May 2014): 185–91. http://dx.doi.org/10.2749/101686614x13830790993366.
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Xu, Yihong, and Chuanxi Zhu. "On super efficiency in set-valued optimisation in locally convex spaces." Bulletin of the Australian Mathematical Society 71, no. 2 (April 2005): 183–92. http://dx.doi.org/10.1017/s0004972700038168.
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The set-valued optimisation problem with constraints is considered in the sense of super efficiency in locally convex linear topological spaces. Under the assumption of nearly cone-subconvexlikeness, by applying the separation theorem for convex sets, Kuhn-Tucker and Lagrange necessary conditions for the set-valued optimisation problem to attain its super efficient solutions are obtained. Also, Kuhn-Tucker and Lagrange sufficient conditions are derived. Finally two kinds of unconstrained programs equivalent to set-valued optimisation problems are established.
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Baublys, Adolfas. "IMPROVEMENT OF FREIGHT TRANSPORT TECHNOLOGIES AND IMPLEMENTATION OF NEW TECHNOLOGIES." TRANSPORT 18, no. 5 (October 31, 2003): 193–97. http://dx.doi.org/10.3846/16483840.2003.10414096.
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The synthesis of regional (urban) road transport freight system topological structure enables the assessment of impact exercised by various structural characteristics on the functioning of the system. For this reason the quality of project solutions in the stage of system structural synthesis increases. Models of optimisation and simulation (included into the simulation procedure of optimisation of topological structure) have other possibilities as well. For instance, simulation model enables the solution of such various objectives of functional analysis of systems as, for example, the efficiency comparison analysis of stability of structure undergoing the changes of meanings of system parameters, the analysis of managing impacts of various types, loading technologies, etc.
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Billenstein, D., C. Dinkel, and F. Rieg. "Automated Topological Clustering of Design Proposals in Structural Optimisation." International Journal of Simulation Modelling 17, no. 4 (December 15, 2018): 657–66. http://dx.doi.org/10.2507/ijsimm17(4)454.
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KAMAHORI, Mizuki, Hiroshi ISAKARI, Toru TAKAHASHI, and Toshiro MATSUMOTO. "A structural optimisation using shape and topological derivatives simultaneously." Proceedings of OPTIS 2018.13 (2018): 111. http://dx.doi.org/10.1299/jsmeoptis.2018.13.111.
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Matamala, Adelio R., and Ernesto Estrada. "Generalised topological indices: Optimisation methodology and physico-chemical interpretation." Chemical Physics Letters 410, no. 4-6 (July 2005): 343–47. http://dx.doi.org/10.1016/j.cplett.2005.05.096.
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YOSHIMITSU, Ichi, Hiroshi ISAKARI, Toru TAKAHASHI, and Toshiro MATSUMOTO. "A topological optimisation for 3D elastostatic problem with boundary element method." Proceedings of The Computational Mechanics Conference 2016.29 (2016): 4_115. http://dx.doi.org/10.1299/jsmecmd.2016.29.4_115.
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Skworcow, P., D. Paluszczyszyn, and B. Ulanicki. "Pump schedules optimisation with pressure aspects in complex large-scale water distribution systems." Drinking Water Engineering and Science Discussions 7, no. 1 (February 10, 2014): 121–49. http://dx.doi.org/10.5194/dwesd-7-121-2014.
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Abstract. This paper considers optimisation of pump and valve schedules in complex large-scale water distribution networks (WDN), taking into account pressure aspects such as minimum service pressure and pressure-dependent leakage. An optimisation model is automatically generated in GAMS language from a hydraulic model in EPANET format and from additional files describing operational constraints, electricity tariffs and pump station configurations. The paper describes in details how each hydraulic component is modelled. To reduce the size of the optimisation problem the full hydraulic model is simplified using module reduction algorithm, while retaining the nonlinear characteristics of the model. Subsequently, a nonlinear programming solver CONOPT is used to solve the optimisation model, which is in the form of Nonlinear Programming with Discontinuous Derivatives (DNLP). The results produced by CONOPT are processed further by heuristic algorithms to generate integer solution. The proposed approached was tested on a large-scale WDN model provided in EPANET format. The considered WDN included complex structures and interactions between pump stations. Solving of several scenarios considering different horizons, time steps, operational constraints, demand levels and topological changes demonstrated ability of the approach to automatically generate and solve optimisation problems for variety of requirements.
Dissertations / Theses on the topic "Topological Optimisation"
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Farsangi, Hossein E. "Topological optimisation of double layer grids using genetic algorithm." Thesis, University of Surrey, 2002. http://epubs.surrey.ac.uk/750/.
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He, Shiye. "Topological optimisation of artificial neural networks for financial asset forecasting." Thesis, London School of Economics and Political Science (University of London), 2015. http://etheses.lse.ac.uk/3225/.
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The classical Artificial Neural Network (ANN) has a complete feed-forward topology, which is useful in some contexts but is not suited to applications where both the inputs and targets have very low signal-to-noise ratios, e.g. financial forecasting problems. This is because this topology implies a very large number of parameters (i.e. the model contains too many degrees of freedom) that leads to over fitting of both signals and noise. This results in the ANN having very good in-sample performance on the data used for its training but poor performance outof-sample for forecasting. The main contribution of my research is to develop a new heuristic method called “ANN reduction” for optimising the topological structure of a feed-forward ANN in order to improve its out-of-sample performance (using an RMS measure). The research concentrated on the topological optimization of the graph representing an ANN, which reduces the effective degrees of freedom of the ANN whilst still maintaining its feed-forward (but incomplete) topology. Such reductions in the number of parameters have been attempted before in the literature, but our procedure is of a different (graph theoretic) nature and (in extremis) optimal for small-size ANNs. Two applications of the ANN reduction are also implemented and programmed for empirical simulations. For this purpose, two datasets generated from deterministic functions and three datasets derived from foreign exchange market prices are used for evaluating the ANN reduction applications. These applications generate new ANN topologies with some clear performance advantages over those obtained by the best complete ANNs, improving the generalization (out-of-sample) performance by up to 27.6% compared to the complete ANN on the function generated datasets and up to 14.1% on the financial forecasting problem for the FX data.
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Da, Daicong. "Topological optimization of complex heterogeneous materials." Thesis, Paris Est, 2018. http://www.theses.fr/2018PESC1102/document.
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Les propriétés effectives mécaniques et physiques des matériaux hétérogènes dépendent d'une part de leurs constituants, mais peuvent également être fortement modifiées par leur répartition géométrique à l'échelle de la microstructure. L'optimisation topologique a pour but de définir la répartition optimale de matière dans une structure en vue de maximiser un ou plusieurs objectifs tels que les propriétés mécaniques sous des contraintes telles que la masse de matière. Récemment, les développements rapides de l'impression 3D ou d'autres techniques de fabrication additive ont rendu possible la fabrication de matériaux avec des microstructures "à la demande", ouvrant de nouvelles perspectives inédites pour la conception de matériaux. Dans ce contexte, les objectifs de cette thèse sont de développer des outils de modélisation et de simulation numériques pour concevoir des matériaux et des structures hétérogènes ayant des propriétés optimisées basés sur l'optimisation topologique. Plus précisément, nous nous intéressons aux points suivants. Premièrement, nous proposons des contributions à l'optimisation topologique à une seule échelle. Nous présentons tout d'abord une nouvelle méthode d'optimisation topologique avec évolution pour la conception de structures continues par description lisse de bords. Nous introduisons également deux techniques d'homogénéisation topologique pour la conception de microstructures possédant des propriétés effectives extrêmes et des « méta propriétés » (coefficient de Poisson négatif).Dans une seconde partie, des techniques multi échelle basées sur l'optimisation topologique sont développées. Nous proposons d'une part une approche concourante de structures hétérogènes dont les microstructures peuvent posséder plus de deux matériaux. Nous développons ensuite une approche d'optimisation topologique dans un cadre d'homogénéisation pour des échelles faiblement séparées, induisant des effets de gradient. Enfin dans une troisième partie, nous développons l'optimisation topologique pour maximiser la résistance à la fracture de structures ou de matériaux hétérogènes. La méthode de champs de phase pour la fracture est combinée à la méthode BESO pour concevoir des microstructures permettant d'augmenter fortement la résistance à la rupture. La technique prend en compte l'initiation, la propagation et la rupture complète de la structureMechanical and physical properties of complex heterogeneous materials are determined on one hand by the composition of their constituents, but can on the other hand be drastically modified by their microstructural geometrical shape. Topology optimization aims at defining the optimal structural or material geometry with regards to specific objectives under mechanical constraints like equilibrium and boundary conditions. Recently, the development of 3D printing techniques and other additive manufacturing processes have made possible to manufacture directly the designed materials from a numerical file, opening routes for totally new designs. The main objectives of this thesis are to develop modeling and numerical tools to design new materials using topology optimization. More specifically, the following aspects are investigated. First, topology optimization in mono-scale structures is developed. We primarily present a new evolutionary topology optimization method for design of continuum structures with smoothed boundary representation and high robustness. In addition, we propose two topology optimization frameworks in design of material microstructures for extreme effective elastic modulus or negative Poisson's ratio. Next, multiscale topology optimization of heterogeneous materials is investigated. We firstly present a concurrent topological design framework of 2D and 3D macroscopic structures and the underlying three or more phases material microstructures. Then, multiscale topology optimization procedures are conducted not only for heterogeneous materials but also for mesoscopic structures in the context of non-separated scales. A filter-based nonlocal homogenization framework is adopted to take into account strain gradient. Finally, we investigate the use of topology optimization in the context of fracture resistance of heterogeneous structures and materials. We propose a first attempt for the extension of the phase field method to viscoelastic materials. In addition, Phase field methods for fracture able to take into account initiation, propagation and interactions of complex both matrix and interfacial micro cracks networks are adopted to optimally design the microstructures to improve the fracture resistance
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Vopařil, Jan. "Tvarová optimalizace klikového hřídele leteckého motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229512.
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This thesis describes the variety and the width of issues connected with crankshafts of combustion engines. It distinguishes different factors, which influence the shape and size of these crankshafts and the selected findings are then transferred into the design of crankshaft for the particular engine. The thesis also presents coherent description of application of topology optimization to the particular crankshaft and also different, more complex design procedures leading to the optimal shape of crankshaft are afterwards suggested. Quality of such a design is then verified by comparative analysis of fatigue of the crankshaft.
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Du, Jia-Zheng. "Methods and software development for sectional and topological optimization of frame structures." Reims, 2004. http://theses.univ-reims.fr/exl-doc/GED00000024.pdf.
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Afin de satisfaire les besoins industriels en calcul et optimisation des structures, des méthodes de l'optimisation de section et de topologie de structures de poutre ont été étudiées et des logiciels pertinents basés sur ces méthodes ont été développés en utilisant les logiciels MSC/Patran-Nastran comme plate-forme. En combinant la méthode de critère d'optimalité et la méthode de programmation mathématique, différentes méthodes sont utilisées pour traiter les limitations avec différentes propriétés. Le modèle original de l'optimisation de section est transformé en un problème dual selon la théorie duale pour améliorer l'efficacité de résolution. La méthode de "Approximate Scaling Step" et la méthode d'Elimination des Limitations Négatives permettent d'accélérer la procédure d'optimisation. Basé sur la méthode ICM (Independent Continuous Mapping), un modèle de l'optimisation topologique utilisant les variables continues (entre 0 et 1 au lieu de 0 ou 1) est établi. Trois critères de convergence sont introduits pour obtenir rapidement et précisément la topologie optimale d'une structure. Pour ne pas éliminer les éléments ayant leur variable topologique nulle au cours de l'optimisation, la méthode de faible matériau est utilisée et comparée à la méthode de section minime. L'optimisation de topologie dans plusieurs cas de chargement est étudiée sous trois types de limitations : les limitations locales de contraintes, les limitations globales de déplacements et leur combinaison. Les méthodes ci-dessus ont été implantées dans les logiciels MSC/Patran&Nastran. Des exemples ont montré une amélioration importante de l'efficacité et de la précision dans l'optimisation de section et de topologieTo satisfy the requirement on computation and optimization of frame structures in the engineering field, some sectional and topological optimization methods of frame structures are studied and a relevant software based on the present study is developed using the MSC/Patran&Nastran software as platform. Combining the optimality criteria method and the mathematical programming method, several methods are adopted to deal with the constraints with different properties. The original sectional optimization model is transformed into a dual problem according to the dual theory in order to reduce the number of the design variables so speed up the resolution. The methods of Approximate Scaling Step and Deletion of Negative Constraints also largely improve the efficiency. Based on the ICM (Independent Continuous Mapping) method, a topological optimization model with continuous topological variables (between 0 and 1 instead of 0 or 1) is built. In order to quickly and accurately obtain the optimum topological structures, three criteria are introduced and a self-adaptive algorithm is proposed. To deal with the elements with their null topological variable, the weak material method is proposed and compared with the tiny section method. The topological optimization for multi-loading cases is studied with three conditions: the local stress constraints, the global displacement constraints and their combination. According to the above methods, the MSC/Patran&Nastran software is secondly developed. The examples clearly show the notable improvement of the efficiency and accuracy
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Laszczyk, Laurent. "Homogénéisation et optimisation topologique de panneaux architecturés." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00721807.
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La conception sur-mesure de matériaux architecturés à l'échelle du milli/centimètre est une stratégie pour développer des matériaux de structure plus performants vis-à-vis de cahiers des charges multifonctionels. Ce travail de thèse s'intéresse en particulier à la conception optimale de panneaux architecturés périodiques, dans le but de combiner des exigences mécaniques de flexion et de cisaillement, ainsi que de conductivité thermique. Le comportement élastique peut être prédit grâce à l'identification sur la cellule périodique des coefficients de la matrice des souplesses équivalente. Ces calculs d'homogénéisation ont été mis en oeuvre par éléments finis pour estimer en particulier les souplesses en flexion et en cisaillement transverse. Après validation expérimentale, cette méthode de calcul constitue un outil d'évaluation des performances mécaniques pour chaque géométrie de cellule périodique (2D ou 3D). À titre d'exemple, et dans un contexte de développement de solutions matériaux architecturés pour l'automobile, la conception de tôles "texturées" est proposée en menant une étude paramétrique à l'aide de cet outil. L'implémentation d'un algorithme d'optimisation topologique couplé à la procédure d'homogénéisation permet d'enrichir les méthodes de conception sur-mesure en élargissant l'espace de recherche des "architectures". Après l'étude modèle du compromis entre flexion et cisaillement, le cas industriel d'un panneau sandwich isolant est traité. Dans ce cas, l'optimisation fournit plusieurs compromis prometteurs entre rigidité en cisaillement et isolation thermique. Ces géométries ont été réalisées et testées, et une nouvelle version améliorée du panneau sandwich a été sélectionnée.
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Rakotondrainibe, Lalaina. "Optimisation topologique des liaisons dans les systèmes mécaniques." Thesis, Institut polytechnique de Paris, 2020. http://www.theses.fr/2020IPPAX101.
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L'optimisation topologique est communément appliquée aux pièces mécaniques. En général, elle n'implique qu'une seule pièce dont les liaisons mécaniques sont supposées fixes. Cette thèse propose une autre approche de l'optimisation topologique où les liaisons sont des variables de conception, au même titre que la géométrie et la topologie de la forme de la pièce. On s'intéresse aux vis longues normalisées avec précontrainte de serrage. Le modèle de la vis est idéalisé, le but étant d'obtenir une représentation fonctionnelle, mais réaliste et peu coûteuse en termes de temps de calcul. Le modèle idéalisé est complété par des contraintes mécaniques spécifiques à la vis.Le problème consiste à optimiser simultanément la structure d'une pièce, d'une part, et les positions et le nombre de vis, d'autre part. La structure élastique est représentée par une fonction ligne de niveaux et elle est optimisée avec la méthode de variations de frontière d'Hadamard. Les positions sont optimisées avec un algorithme de descente de gradient paramétrique. Le concept de gradient topologique est adapté pour ajouter une petite vis idéalisée au meilleur emplacement avec une orientation optimale pour optimiser le nombre de vis. Cette optimisation couplée (structure et liaisons) est illustrée par des cas tests académiques 2d et 3d. Elle est ensuite appliquée à un cas test industriel simplifié. Le couplage fournit une pièce plus performante que l'optimisation de forme à liaisons fixées. Cette approche tend par conséquent à optimiser les systèmes assemblésTopology optimization is commonly used for mechanical parts. It usually involves a single part and connections to other parts are assumed to be fixed. This thesis proposes an other approach of topology optimization in which connections are design variables, as well as the structure. We focus on standard long bolt with prestressed state. This connection model is idealized to be enough representative but computationally cheap. The idealized model is complemented with mechanical constraints specific to the bolt.The problem is to optimize concurrently the topology and the geometry of a structure, on the one hand, and the locations and the number of bolts, on the other hand. The elastic structure is represented by a level-set function and is optimized with Hadamard's boundary variation method. The locations are optimized using a parametric gradient-based algorithm. The concept of topological derivative is adapted to add a small idealized bolt at the best location with the optimal orientation, and thus optimizes the number of bolts. This coupled topology optimization (shape and connections) is illustrated with 2d and 3d academic test cases. It is then applied on a simplified industrial test case. The coupling provides more satisfactory performance of a part than shape optimization with fixed connections. The approach presented in this work is therefore one step closer to the optimization of assembled systems
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Doutre, Pierre-Thomas. "Comment intégrer et faire émerger des structures architecturées dans l'optimisation de pièces pour la fabrication additive par faisceaux d’électrons." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI039.
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Grâce à la fabrication additive, il est aujourd'hui possible de fabriquer de nouvelles géométries. Les perspectives offertes par les moyens de fabrications conventionnelles et additives sont très différentes. Des propositions de design très contraintes peuvent devenir beaucoup plus libres avec la fabrication additive. Cette liberté qu'elle offre fait émerger une multitude de possibilités. Dans ce manuscrit, nous nous sommes focalisés sur un type particulier de structures (les octetruss) ainsi que sur les moyens de fabrication EBM (Electron Beam Melting) de la société ARCAM. Les travaux présentés dans cette thèse ont été réalisés au sein des laboratoires G-SCOP et SIMAP ainsi qu'en partenariat avec l'entreprise POLY-SHAPE. Ce manuscrit est articulé autour de trois principaux points.Il s'agit tout d'abord de faire émerger des structures treillis lors du processus de conception. Pour cela, deux approches existantes sont détaillées. La première met en œuvre l'optimisation topologique et la seconde s'appuie sur le concept de matériau équivalent. Ensuite deux méthodologies permettent de faire émerger des zones dans lesquelles l'intégration de structures treillis est adaptée. La première consiste à réaliser les différentes zones en s'appuyant sur un champ de contraintes issu d'un calcul Eléments Finis, la seconde se base sur un résultat d'optimisation topologique pour établir les différentes zones. Cette seconde méthodologie est appliquée à un cas d'étude industriel.Ensuite nous étudions comment remplir les différentes zones avec des structures treillis adaptées en nous focalisant tout d'abord sur leur génération. Un accent particulier est porté sur l'intersection des différents barreaux par la mise en place de sphères. Une méthodologie permettant de générer des arrondis est également proposée. Une étude est menée sur l'ensemble des paramètres et informations à considérer pour intégrer une structure treillis à une zone donnée. Cette étude conduit à une proposition de méthodologie qui est appliquée à un cas d'étude industriel.Enfin, les aspects liés à la fabrication sont pris en compte. Pour cela, nous considérons différentes limites du moyen de fabrication EBM pour des structures treillis comme les dimensions maximales réalisables ou les problématiques thermiques. Une étude consistant à prédire la dépoudrabilité des pièces est réalisée. Enfin, des essais mécaniques sont effectués. Nos résultats sont comparés à ceux obtenus dans d'autres travaux. L'impact des arrondis sur le comportement mécanique d'une pièce est discutéThanks to additive manufacturing, it is now possible to manufacture new geometric shapes. The prospects offered by the methods of conventional and additive manufacturing are very different. Highly constrained design proposals can become much freer with additive manufacturing. The freedom it offers brings forward a multitude of possibilities. In this manuscript, we focused on a particular type of structures (the octetruss) as well as the use of EBM (Electron Beam Melting) of ARCAM as a means of manufacturing. The work presented in this thesis was carried out in the laboratories G-SCOP and SIMAP as well as in partnership with the company POLY-SHAPE. This manuscript focuses on three main points.The first of which is the action of emergence of lattice structures during the design process. For this, two existing approaches are detailed. The first uses topological optimization and the second is based on the concept of equivalent material. Following these, there are two methodologies used to identify areas in which the integration of lattice structures is possible and appropriate. The first consists of creating the different zones by relying on a stress field resulting from a finite element calculation, the second establishes the different zones using a topological optimization result. This second methodology is applied to an industrial case study.Secondly, we study how to fill the different areas with appropriate lattice structures by focusing first on their generation. Particular emphasis is placed on the intersection of the various bars by the establishment of spheres. A methodology for generating rounded-shape is also proposed. A study is carried out on all the parameters and information in order to integrate a lattice structure to a given area. This study leads to a proposed methodology that is applied to an industrial case study.Finally, aspects related to manufacturing are taken into account. For this, we consider different limits of the EBM manufacturing and what they mean for lattice structures; such as maximum achievable dimensions or thermal problems. A study to predict powder removal in order to extract the fabricated structure is performed. Mechanical tests are carried out. Our results are compared to those obtained in other works. The impact of curve on the mechanical behavior of a product is discussed
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Kulshreshtha, Kshitij. "Modelling and optimisation of the design and topology of flexible frames with rigid joints." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2010. http://dx.doi.org/10.18452/16230.
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Strukturoptimierung ist momentan stark auf Diskretisierungsmethoden angewiesen. In einfachen Fällen, wie die Simulation von Rahmen und Stabwerke, wo eine Diskretisierung nicht notwendig ist, werden nur die Dehnung oder die Stauchung der Stäbe betrachtet, und die Verbindungen sind frei, wie Kugelgelenke, um die Biegungen der Stäbe zu vermeiden. In dieser Dissertation wird eine diskretisierungsfreie Methode zur Modellierung und Optimierung eines Rahmens entwickelt, die die Biegung der Balken sowie die Dehnung oder Stauchung zusammen betrachtet, wobei starre Verbindungen angenommen werden. Starre Verbindungen entstehen, wenn die Balken zusammen geschweißt oder mit mehrere Nieten verbunden sind. Die Optimierungsprobleme, sowohl das Zustands- und als auch das Entwurfsproblem, sind durch die gesamte elastische Energie und die Arbeit der äußeren Kräfte gegeben. Für das Problem der optimalen Größeneinteilung wird darüber hinaus eine topologische Sensitivität zur Einführung neuer Balken zwischen zwei beliebigen Punkten auf dem Rahmen diskutiert.Structural optimisation currently relies heavily on methods based on discretisation. In simpler cases like the simulation of frames and trusses, where discretisation is not necessary, only the elongation or compression is considered and the joints are free, like ball and socket joints, in order to avoid bending the trusses. In this dissertation a discretisation free method for the modelling and optimisation of frames is developed which considers bending of the beams along with compression or elongation with joints between the beams being rigid. Rigid joints are commonly the result of welding two beams together or connecting them using mutiple rivets. The optimisation problems, both state and design optimisation, are formulated via the total elastic energy and the work done by external forces. Moreover, for the optimal sizing problem a topological sensitivity for introduction of new beams between any two arbitrary positions in the frame is discussed.
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Morretton, Elodie. "Une démarche de conception de pièces légères pour la fabrication additive basée sur l'optimisation topologique." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAI017.
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Les procédés de fabrication additive sont en pleine essor ces dernières années. De nombreux industriels cherchent à évaluer leur potentiel et leurs avantages. Ces nouvelles technologies impliquent des changements au niveau des manières de fabriquer mais également au niveau des manières de concevoir. Ce travail de thèse s’est intéressé à ce second aspect et apporte plus particulièrement des réponses à la question de recherche suivante :Quel guide méthodologique suivre pour une étude dont le but est de reconcevoir des pièces afin de s’approcher de l’optimum en termes de masse ?Pour traiter cette question, le problème a été abordé au regard de plusieurs questions sous-jacentes afin de combler les manques identifiés dans l’état de l’art réalisé que ce soit sur les problématiques du paramétrage de l’optimisation topologique ou sur celles des techniques de reconstruction. Nous avons réalisé plusieurs études de cas afin de pouvoir répondre à ces différentes questions et pouvoir ainsi lister les points critiques. Ce travail de thèse a été réalisé en partenariat avec un acteur de l’aéronautique : Zodiac Seats France. Ceci nous a permis de réaliser des études de cas sur des pièces existantes qui possédaient un certain niveau de complexité. Parmi ces études de cas, nous avons distingué deux types d’étude :- Une étude élémentaire pour effectuer des boucles rapides en faisant varier les choix et- Une série d’études industrielles pour regarder s’il y a convergence ou divergence entre les conclusions de l’étude élémentaire et des cas d’applications plus complexes.Puis, nous avons donné une description détaillée d’une méthode de conception pour la fabrication additive basée sur 5 grandes phases :- l’évaluation de la pièce candidate ou des pièces,- la modélisation,- l’optimisation topologique : obtention d’une forme de géométrie,- la reconstruction de la pièce à partir du résultat de l’optimisation topologique et intégration des contraintes de fabrication- l’optimisation dimensionnelle : affiner les dimensions de la géométrie reconstruite.A ces phases, viennent s’ajouter des étapes de contrôle via des analyses éléments finis. Cette démarche s’est construite autour d’observations faites lors du déroulement des études de cas. Pour chacune de ces phases, un ensemble de recommandations a été défini pour aider le concepteur dans l’obtention d’une pièce optimale en termes de masse. Enfin, nous avons donné ce descriptif de la méthode à un concepteur relativement novice pour avoir un nouveau regard sur celle-ci et pouvoir ainsi identifier des points à améliorer. A l’issue de ce travail de conception, ce concepteur a pointé plusieurs points manquants ainsi que plusieurs faiblesses dans l’argumentaire du guide méthodologique. Ses observations et son opinion, nous ont permis de prendre du recul vis-à-vis de notre travail.Les apports majeurs de ce travail de thèse sont :- La description détaillée d’une méthode composée de 5 grandes phases- Dans cette démarche, nous avons dénombré plusieurs étapes clés : une étape préliminaire d’évaluation du potentiel des pièces à reconcevoir au regard de la fabrication additive et plusieurs phases d’optimisation complémentaires (topologie et dimensions),- La mise en avant de l’importance de bien délimiter le périmètre de l’étude (pièce isolée ou dans le mécanisme),- L’identification des étapes au cours desquelles les contraintes de fabrication devront être intégrées- Le positionnement du concepteur au cœur de la méthode : les outils numériques permettent de ne réaliser qu’une partie du travail de conceptionAdditive manufacturing processes have been growing in recent years. Many industries seek to assess their potentials. These new technologies involve changes in terms of manufacturing but also in terms of designing. This work is interested in this second aspect. It brings answers to the following research question:What methodological guide to follow for a study whose goal is to redesign pieces in order to approach the optimum in terms of mass?To answer to this question, the problem is decomposed into several sub questions. These questions must fill the identified lacks in the state of the art, and deal with topological optimization parameters or reconstructions techniques for example. Several case studies are realized to answer to these sub questions and to list the critical points. This work is realized in partnership with an aerospace company: Zodiac Seats France. This allowed us to work on existing parts which have a certain complexity level. Two types of studies can be distinguished:- Basic study: to experiment different strategies and to make variation on the parameter choices rapidly.- Practical study: to check on more complex cases if there is a convergence with basic study conclusions.Then, a detailed description of a design method for additive manufacturing is provided. It is composed in 5 phases:- Evaluation of parts potential.- Model of parts.- Optimization of parts with topological optimization tools: obtaining the shape of the parts.- Reconstruction of parts from the topological result: integration of manufacturing constraints.- Optimization of reconstructed parts with dimensional optimization tools: refinement of the dimensions of reconstructed parts.Between these phases, checked step are added, based on finite element analysis. This method is built on practical observations obtained from the different case studies. For each phase, a set of recommendations is provided to help designers to design lightweight parts. Finally, this descriptive method is given to a novice designer to have the method tested. The aim of this test is having a new vision on this detailed method and identifying points to be improved. At the achievement of this design work, the designer noticed several missing points as well as several weaknesses in the method argument. His observations and his opinions gave us to take a step back from our work.The major contributions of this work are:- The description of a detailed method in 5 large phases.- In this method, there are several key steps : 1 step of evaluation of parts potential with regard to additive manufacturing as well as two complementary steps of optimization (shape and dimensions)- The perimeter of the parts study must be delimited clearly (isolated parts or in the mechanism),- The identification of the stages in which the manufacturing constraints have to be integrated- The position of the designer to the method heart: digital tools realize only one part of the design work
Book chapters on the topic "Topological Optimisation"
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Ballo, Federico, Massimiliano Gobbi, and Giorgio Previati. "Concurrent Topological Optimisation: Optimisation of Two Components Sharing the Design Space." In EngOpt 2018 Proceedings of the 6th International Conference on Engineering Optimization, 725–38. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-97773-7_64.
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Ballo, Federico Maria, Massimiliano Gobbi, Giampiero Mastinu, and Giorgio Previati. "Concurrent Topological Optimisation of Two Bodies Sharing Design Space." In Optimal Lightweight Construction Principles, 215–31. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60835-4_12.
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Feng, Z., P. Gu, M. Zheng, X. Yan, and D. W. Bao. "Environmental Data-Driven Performance-Based Topological Optimisation for Morphology Evolution of Artificial Taihu Stone." In Proceedings of the 2021 DigitalFUTURES, 117–28. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_11.
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AbstractTaihu stone is the most famous one among the top four stones in China. It is formed by the water's erosion in Taihu Lake for hundreds or even thousands of years. It has become a common ornamental stone in classical Chinese gardens because of its porous and intricate forms. At the same time, it has become a cultural symbol through thousands of years of history in China; later, people researched its spatial aesthetics; there are also some studies on its structural properties. For example, it has been found that the opening of Taihu stone caves has a steady-state effect which people develop its value in the theory of Poros City, Porosity in Architecture and some cultural symbols based on the original ornamental value of Taihu stone. This paper introduces a hybrid generative design method that integrates the Computational Fluid Dynamics (CFD) and Bi-directional Evolutionary Structural Optimization (BESO) techniques. Computational Fluid Dynamics (CFD) simulation enables architects and engineers to predict and optimise the performance of buildings and environment in the early stage of the design and topology optimisation techniques BESO has been widely used in structural design to evolve a structure from the full design domain towards an optimum by gradually removing inefficient material and adding materials simultaneously. This research aims to design the artificial Taihu stone based on the environmental data-driven performance feedback using the topological optimisation method. As traditional and historical ornament craftwork in China, the new artificial Taihu stone stimulates thinking about the new value and unique significance of the cultural symbol of Taihu stone in modern society. It proposes possibilities and reflections on exploring the related fields of Porosity in Architecture and Poros City from the perspective of structure.
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Hinze, Thomas, Lea Louise Weber, and Uwe Hatnik. "Walking Membranes: Grid-Exploring P Systems with Artificial Evolution for Multi-purpose Topological Optimisation of Cascaded Processes." In Membrane Computing, 251–71. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-54072-6_16.
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SCHWENK, H., P. GALLINARI, and X. DRIANCOURT. "Adaptive constrained optimisation for improving the topological maps." In Artificial Neural Networks, 1085–88. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-444-89488-5.50054-3.
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Farsangi, H. E. "Topological optimisation of double layer grids using a genetic algorithm." In Space Structures 5, 1: 459–468. Thomas Telford Publishing, 2002. http://dx.doi.org/10.1680/ss5v1.31739.0050.
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Almeida, H., and P. Bártolo. "Micro-CT based topological optimisation scheme for the design of scaffolds." In High Value Manufacturing: Advanced Research in Virtual and Rapid Prototyping, 577–82. CRC Press, 2013. http://dx.doi.org/10.1201/b15961-105.
Full textConference papers on the topic "Topological Optimisation"
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Rahon, D., P. F. Edoa, and M. Masmoudi. "Topological shape optimisation in reservoir engineering." In ECMOR VII - 7th European Conference on the Mathematics of Oil Recovery. European Association of Geoscientists & Engineers, 2000. http://dx.doi.org/10.3997/2214-4609.201406128.
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Lu, B., H. Ou, and Z. S. Cui. "Evolutionary Topological Optimisation for Preform Design." In THE 14TH INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2011. AIP, 2011. http://dx.doi.org/10.1063/1.3589536.
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Almeida, Henrique A., and Paulo J. Bártolo. "Topological Shear Stress Optimisation of Micro-CT Based Scaffolds." In ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20433.
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Additive manufacturing technologies are being used to fabricate scaffolds with controlled architecture for tissue engineering applications. These technologies combined with computer-aided design systems enable to produce three-dimensional structures layer-by-layer in a multitude of materials. Actual prediction of the effective mechanical properties of scaffolds produced by Additive manufacturing systems, is very important for tissue engineering applications. One of the existing computer based techniques for scaffold design is topological optimisation. The goal of topological optimisation is to find the best use of material for a body that is subjected to either a single load or a multiple load distribution. This paper proposes a topological optimisation scheme based on existing micro-CT data in order to obtain the ideal topological architectures of scaffolds, maximising its mechanical behaviour under shear stress solicitations. This approach is based on micro-CT data of real biological tissues to create the loading (shear stress) and constraint surfaces of the scaffold during the topological optimisation process. This particular topological optimisation scheme uses the surface boundaries to produce novel models with different characteristics, which are different from the initial micro-CT models. This approach enables to produce valid biomimetic scaffold topologies for tissue engineering applications.
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Almeida, Henrique A., and Paulo J. Ba´rtolo. "Computer Simulation and Optimisation of Tissue Engineering Scaffolds: Mechanical and Vascular Behaviour." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59460.
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Additive biomanufacturing processes are increasingly recognised as ideal techniques to produce scaffolds for tissue engineering applications. These scaffolds must be biocompatible, biodegradable, with appropriate porosity, pore structure and pore distribution and optimal vascularisation, with both surface and structural compatibility. Surface compatibility means a chemical, biological and physical suitability to the host tissue. Structural compatibility corresponds to an optimal adaptation to the mechanical behaviour of the host tissue. Recent advances in tissue engineering field are increasingly relying on modelling and simulation. This paper proposes a novel computational tool combining structural, computational fluid dynamics and topological optimisation schemes, to predict and optimise both mechanical and vascular behaviour of scaffolds for soft and hard tissue applications, with different topological architectures and levels of porosity. This tool is particularly important to quantify the structural heterogeneity and scaffold mechanical properties with a designed microstructure subjected to either a single or a multiple load distribution. This computational tool enables the simulation of biological flows in vascular passages of scaffolds. The blood flow considered in this study is a complex fluid comprising a suspension of red blood cells, white blood cells and platelets within a newtonian plasma. A topological optimisation scheme is being developed to obtain the ideal scaffold topological architectures.
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"LOCAL ENERGY MINIMISATIONS: AN OPTIMISATION FOR THE TOPOLOGICAL ACTIVE VOLUMES MODEL." In International Conference on Computer Vision Theory and Applications. SciTePress - Science and and Technology Publications, 2006. http://dx.doi.org/10.5220/0001373604680473.
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Paler, Alexandru, and Robert Basmadjian. "Clifford Gate Optimisation and T Gate Scheduling: Using Queueing Models for Topological Assemblies." In 2019 IEEE/ACM International Symposium on Nanoscale Architectures (NANOARCH). IEEE, 2019. http://dx.doi.org/10.1109/nanoarch47378.2019.181305.
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Blackenfelt, Michael, and Ulf Sellgren. "Design of Robust Interfaces in Modular Products." In ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/dac-14486.
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Abstract The design of module interfaces is very important when developing so-called modular products. The interfaces should not only be designed for the module variety but should also be specified early to allow parallel activities. This paper outlines an approach where the interfaces, in the beginning of the process, are defined within some bounds. Later when more information about the modules and their variety is available the interface is conceptualised by topological optimisation and detailed by shape optimisation. The shape optimisation is however complemented with Robust Design technique in order to increase the interface commonality for the variety range.
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Meah, N., M. Hunt, R. Evans, T. Racz, J. Verdicchio, A. Kudryavtsev, and Bill Dawes. "Digital Geometry and Morphing to Support Analysis and Design." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-76862.
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This paper describes the application of geometry morphing, integrated with meshing and flow simulation, to the topological optimisation of gas turbine film cooling holes. Using a Genetic Algorithm to manage the digitally represented geometry a wide range of novel cooling hole shapes can be generated and useful improvements in film cooling effectiveness are observed. The simulations suggest that modified vortical flow structures are responsible for improved coolant distribution and coverage at hole exit.
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Almeida, Henrique A., and Paulo J. Ba´rtolo. "The Use of Schwartz Geometries for Scaffold Design in Tissue Engineering Applications." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-25385.
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Additive biomanufacturing processes are increasingly recognised as ideal techniques to produce scaffolds for tissue engineering applications. Scaffolds provide a temporary mechanical and vascular support for tissue regeneration while shaping the in-growth tissues. These scaffolds must be biocompatible, biodegradable, with appropriate porosity, pore structure and pore distribution and optimal vascularisation, with both surface and structural compatibility. Surface compatibility means a chemical, biological and physical suitability to the host tissue. Structural compatibility corresponds to an optimal adaptation to the mechanical behaviour of the host tissue. Recent advances in the tissue engineering field are increasingly relying on modelling and simulation. The design of optimised scaffolds based on the fundamental knowledge of its microstructure is a relevant topic of research. This paper proposes the use of novel geometric structures based on the Triple Periodic Minimal Surfaces formulation, namely the Schwartz primitives, one of the a sub-classes of Triple Periodic Minimal Surfaces. Schwartz primitives enables the design of vary high surface-to-volume ratio structures with high porosity and mechanical/vascular properties. With the use of a computational tool combining structural, computational fluid dynamics and topological optimisation schemes, it is possible to predict and optimise both mechanical and vascular behaviour of scaffolds for soft and hard tissue applications, with different topological architectures and levels of porosity. This tool is particularly important to quantify the structural heterogeneity and scaffold mechanical properties with a designed microstructure subjected to either a single or a multiple load distribution. This computational tool enables the simulation of biological flows in vascular passages of scaffolds. The blood flow considered in this study is a complex fluid comprising a suspension of red blood cells, white blood cells and platelets within a newtonian plasma.
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R. M. Ribeiro, Rafael, Matheus S. S. Fogliatto, Henrique O. Caetano, Benvindo R. P. Junior, and Carlos D. Maciel. "Metaheuristic Search for Optimum Cost-Benefit Resilience Level by Redundancy Adding." In Congresso Brasileiro de Automática - 2020. sbabra, 2020. http://dx.doi.org/10.48011/asba.v2i1.1424.
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Modern systems have become increasingly more complex, and their analysis becomes signicantly more complex. Many practical aspects of complex network tools have mainly been applied to critical infrastructure, in particular, to study power systems' resilience. Blackout prevention, system resilience, and restoration consider the ability of the system's self-healing. The self-healing strategies depend, basically, on the existence of extra lines to re-route energy.Some studies suggested that there is an optimum cost-benefit point when adding power lines redundancies to a system considering the systems' resilience. One method to solve this optimisation problem is the use of a metaheuristic algorithm. These algorithms combine exploration and exploitation on the search for a solution. In this paper, a Chu-Beasley genetic algorithm is used to search for the optimum cost-benefit level of redundancy in a system. Thesystem used is from the Repository of Distribution Systems (REDS), and the function used to evaluate the resilience considers an efficiency coecient so that the resilience by cost curve would have a maximum point. This experiment is executed as a topological analysis. The expected results were obtained using estimated curves from Monte-Carlo simulations for a wide range of combination of parameters. The results from three different parameters of efficiency coefficient were compared to the expected values obtained. The results show that there is a best cost-benefit level of redundancy when an efficiency level is determinate. Also, the GA used has excellent performance for finding this point.