HAL (Le Centre pour la Communication Scientifique Directe), 2021
Topology optimization is devoted to the optimal design of structures: It aims at finding the best... more Topology optimization is devoted to the optimal design of structures: It aims at finding the best material distribution inside a working domain while fulfilling mechanical, geometrical and manufacturing specifications. Conceptually different from parametric or size optimization, topology optimization relies on a freeform approach enabling to search for the optimal design in a larger space of configurations and promoting disruptive design. The need for lighter and efficient structural solutions has made topology optimization a vigorous research field in both academic and industrial structural engineering communities. This contribution presents a Research and Development software platform for shape and topology optimization where the computational process is carried out in a level set framework combined with a body-fitted approach.
HAL (Le Centre pour la Communication Scientifique Directe), Sep 12, 2019
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Nous nous intéressons à l'optimisation topologique en mécanique du contact par la méthode des lig... more Nous nous intéressons à l'optimisation topologique en mécanique du contact par la méthode des lignes de niveau. Nous considérons une structure linéaire élastique contrainte unilatéralement par des supports rigides et possédant une interface en auto-contact. Le contact est modélisé par les conditions aux limites de Signorini et la friction par la loi de Coulomb. En pénalisant les conditions aux limites, le problème non linéaire obtenu est traité numériquement à l'aide des méthodes de point fixe et de Newton-Raphson. La compliance élastique de la structure est minimisée sous une contrainte de volume. Mots clés-optimisation topologique; contact; ligne de niveau; adaptation de maillage.
This article presents a numerical method for facial reconstruction. The problem is the following:... more This article presents a numerical method for facial reconstruction. The problem is the following: if I only have a dry skull, can I reconstruct a virtual face that would enhance the identification of the subject? Our approach combines classical features as the use of a skulls/faces database to learn the relations between the two items and more original aspects: (i) we use an original shape matching method to link the unknown skull to the database templates; (ii) the final face is seen as an elastic 3d mask which is adapted onto the unknown skull. Using our method the skull is considered as a whole surface-represented by a surface triangulation-and not restricted to some anatomical landmarks, allowing a dense description of the skull/face relationship. In particular, our approach is fully-automated. We present some preliminary results to show its efficiency.
This article presents a new numerical method for facial reconstruction. The problem is the follow... more This article presents a new numerical method for facial reconstruction. The problem is the following: given a dry skull, reconstruct a virtual face that would help in the identification of the subject. The approach combines classical features as the use of a skulls/faces database and more original aspects: (1) an original shape matching method is used to link the unknown skull to the database templates; (2) the final face is seen as an elastic 3D mask that is deformed and adapted onto the unknown skull. In this method, the skull is considered as a whole surface and not restricted to some anatomical landmarks, allowing a dense description of the skull/face relationship. Also, the approach is fully automated. Various results are presented to show its efficiency.
Partial differential equations/Numerical analysis An optimization method for elastic shape matchi... more Partial differential equations/Numerical analysis An optimization method for elastic shape matching Une méthode d'optimisation pour l'appariement de formes élastiques
Tetrahedral remeshing in the context of large-scale numerical simulation and high performance com... more Tetrahedral remeshing in the context of large-scale numerical simulation and high performance computing
Mesh deformation strategies in shape optimization. Application to forensic facial reconstruction. (Méthodes de déformation de maillage en optimisation de forme. Application à la reconstruction faciale pour la médecine légale)
This thesis is devoted to the conception, the development and the analysis of mesh deformation st... more This thesis is devoted to the conception, the development and the analysis of mesh deformation strategies for shape modeling, processing and comparison -as shape matching and surface reconstruction- and, in a rather independent concern, for devising a robust computational method for facial reconstruction. Facial reconstruction is about the estimation of a facial shape from the sole datum of the underlying skull and is a challenging problem in anthropology and forensic science. The main contribution of the thesis is the design of a novel method for shape matching, borrowing techniques from the shape optimization context. Under the sole assumption that the two shapes share the same topology, the desired mapping is achieved as a sequence of elastic displacements by minimizing an energy functional based on a signed distance function. Several numerical examples are presented to show the efficiency of the method.Also, a novel method for generating a closed surface mesh model of an initial...
HAL (Le Centre pour la Communication Scientifique Directe), 2021
Topology optimization is devoted to the optimal design of structures: It aims at finding the best... more Topology optimization is devoted to the optimal design of structures: It aims at finding the best material distribution inside a working domain while fulfilling mechanical, geometrical and manufacturing specifications. Conceptually different from parametric or size optimization, topology optimization relies on a freeform approach enabling to search for the optimal design in a larger space of configurations and promoting disruptive design. The need for lighter and efficient structural solutions has made topology optimization a vigorous research field in both academic and industrial structural engineering communities. This contribution presents a Research and Development software platform for shape and topology optimization where the computational process is carried out in a level set framework combined with a body-fitted approach.
HAL (Le Centre pour la Communication Scientifique Directe), Sep 12, 2019
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Nous nous intéressons à l'optimisation topologique en mécanique du contact par la méthode des lig... more Nous nous intéressons à l'optimisation topologique en mécanique du contact par la méthode des lignes de niveau. Nous considérons une structure linéaire élastique contrainte unilatéralement par des supports rigides et possédant une interface en auto-contact. Le contact est modélisé par les conditions aux limites de Signorini et la friction par la loi de Coulomb. En pénalisant les conditions aux limites, le problème non linéaire obtenu est traité numériquement à l'aide des méthodes de point fixe et de Newton-Raphson. La compliance élastique de la structure est minimisée sous une contrainte de volume. Mots clés-optimisation topologique; contact; ligne de niveau; adaptation de maillage.
This article presents a numerical method for facial reconstruction. The problem is the following:... more This article presents a numerical method for facial reconstruction. The problem is the following: if I only have a dry skull, can I reconstruct a virtual face that would enhance the identification of the subject? Our approach combines classical features as the use of a skulls/faces database to learn the relations between the two items and more original aspects: (i) we use an original shape matching method to link the unknown skull to the database templates; (ii) the final face is seen as an elastic 3d mask which is adapted onto the unknown skull. Using our method the skull is considered as a whole surface-represented by a surface triangulation-and not restricted to some anatomical landmarks, allowing a dense description of the skull/face relationship. In particular, our approach is fully-automated. We present some preliminary results to show its efficiency.
This article presents a new numerical method for facial reconstruction. The problem is the follow... more This article presents a new numerical method for facial reconstruction. The problem is the following: given a dry skull, reconstruct a virtual face that would help in the identification of the subject. The approach combines classical features as the use of a skulls/faces database and more original aspects: (1) an original shape matching method is used to link the unknown skull to the database templates; (2) the final face is seen as an elastic 3D mask that is deformed and adapted onto the unknown skull. In this method, the skull is considered as a whole surface and not restricted to some anatomical landmarks, allowing a dense description of the skull/face relationship. Also, the approach is fully automated. Various results are presented to show its efficiency.
Partial differential equations/Numerical analysis An optimization method for elastic shape matchi... more Partial differential equations/Numerical analysis An optimization method for elastic shape matching Une méthode d'optimisation pour l'appariement de formes élastiques
Tetrahedral remeshing in the context of large-scale numerical simulation and high performance com... more Tetrahedral remeshing in the context of large-scale numerical simulation and high performance computing
Mesh deformation strategies in shape optimization. Application to forensic facial reconstruction. (Méthodes de déformation de maillage en optimisation de forme. Application à la reconstruction faciale pour la médecine légale)
This thesis is devoted to the conception, the development and the analysis of mesh deformation st... more This thesis is devoted to the conception, the development and the analysis of mesh deformation strategies for shape modeling, processing and comparison -as shape matching and surface reconstruction- and, in a rather independent concern, for devising a robust computational method for facial reconstruction. Facial reconstruction is about the estimation of a facial shape from the sole datum of the underlying skull and is a challenging problem in anthropology and forensic science. The main contribution of the thesis is the design of a novel method for shape matching, borrowing techniques from the shape optimization context. Under the sole assumption that the two shapes share the same topology, the desired mapping is achieved as a sequence of elastic displacements by minimizing an energy functional based on a signed distance function. Several numerical examples are presented to show the efficiency of the method.Also, a novel method for generating a closed surface mesh model of an initial...
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Papers by Chiara Nardoni