{ "types" : { "Bookmark" : { "pluralLabel" : "Bookmarks" }, "Publication" : { "pluralLabel" : "Publications" }, "GoldStandardPublication" : { "pluralLabel" : "GoldStandardPublications" }, "GoldStandardBookmark" : { "pluralLabel" : "GoldStandardBookmarks" }, "Tag" : { "pluralLabel" : "Tags" }, "User" : { "pluralLabel" : "Users" }, "Group" : { "pluralLabel" : "Groups" }, "Sphere" : { "pluralLabel" : "Spheres" } }, "properties" : { "count" : { "valueType" : "number" }, "date" : { "valueType" : "date" }, "changeDate" : { "valueType" : "date" }, "url" : { "valueType" : "url" }, "id" : { "valueType" : "url" }, "tags" : { "valueType" : "item" }, "user" : { "valueType" : "item" } }, "items" : [ { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2340afc5fafcc77a807e2074ea66f5655/petraheim", "tags" : [ "2021","aldinger","bechert","buga","computational","design","engineering","fabrication","finger","form-finding","heilbronn","integrative","itke","joints","knippers","lightweight","methods","modular","optimization","plate","robotic","segmented","shell","sonntag","structure","timber" ], "intraHash" : "340afc5fafcc77a807e2074ea66f5655", "interHash" : "6e81c9dcb5cfe86b6b5e6c16652f2c05", "label" : "Integrative structural design and engineering methods for segmented timber shells : BUGA Wood Pavilion", "user" : "petraheim", "description" : "", "date" : "2023-03-27 12:30:50", "changeDate" : "2023-05-16 11:39:36", "count" : 5, "pub-type": "article", "journal": "Structures","publisher":"Elsevier", "year": "2021", "url": "", "author": [ "Simon Bechert","Daniel Sonntag","Lotte Aldinger","Jan Knippers" ], "authors": [ {"first" : "Simon", "last" : "Bechert"}, {"first" : "Daniel", "last" : "Sonntag"}, {"first" : "Lotte", "last" : "Aldinger"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "34","number": "December","pages": "4814-4833","abstract": "The presented research describes the holistic development of a modular lightweight timber shell. So-called segmented timber shells approximate curved geometries with the use of planar plates, thus combining the excellent structural performance of double curved shells with the resource-efficient prefabrication of timber modules using only planar elements. Segmented timber shells constitute a novel building system that demands for innovative approaches on structural design and construction technologies. The geometric complexity of plate shells in conjunction with the particularities of the building material wood pose great challenges to the computational design and planning processes as structural requirements and fabrication constraints determine the shell design at early design phases. This paper discusses the design development and construction of the BUGA Wood Pavilion: A segmented timber shell structure made of hollow cassette components. Particular\r\nemphasis lies on the technical challenges of the employed building system, notably structural design and analysis, detailing solutions and the construction process. The authors further describe the integrative structural design and optimization methods developed for the timber shell in question. The BUGA Wood Pavilion demonstrates\r\nthe possibilities of lightweight and sustainable wood architecture merging the merits of integrative design, structural engineering and high-tech robotic fabrication methods.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.istruc.2021.10.032", "bibtexKey": "bechert2021integrative" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2340afc5fafcc77a807e2074ea66f5655/itke", "tags" : [ "modular","finger","sonntag","segmented","knippers","engineering","shell","2021","structure","itke","from:petraheim","fabrication","form-finding","buga","methods","aldinger","joints","heilbronn","plate","robotic","lightweight","integrative","design","optimization","timber","computational","bechert" ], "intraHash" : "340afc5fafcc77a807e2074ea66f5655", "interHash" : "6e81c9dcb5cfe86b6b5e6c16652f2c05", "label" : "Integrative structural design and engineering methods for segmented timber shells : BUGA Wood Pavilion", "user" : "itke", "description" : "", "date" : "2023-03-27 12:30:50", "changeDate" : "2023-05-16 11:39:36", "count" : 5, "pub-type": "article", "journal": "Structures","publisher":"Elsevier", "year": "2021", "url": "", "author": [ "Simon Bechert","Daniel Sonntag","Lotte Aldinger","Jan Knippers" ], "authors": [ {"first" : "Simon", "last" : "Bechert"}, {"first" : "Daniel", "last" : "Sonntag"}, {"first" : "Lotte", "last" : "Aldinger"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "34","number": "December","pages": "4814-4833","abstract": "The presented research describes the holistic development of a modular lightweight timber shell. So-called segmented timber shells approximate curved geometries with the use of planar plates, thus combining the excellent structural performance of double curved shells with the resource-efficient prefabrication of timber modules using only planar elements. Segmented timber shells constitute a novel building system that demands for innovative approaches on structural design and construction technologies. The geometric complexity of plate shells in conjunction with the particularities of the building material wood pose great challenges to the computational design and planning processes as structural requirements and fabrication constraints determine the shell design at early design phases. This paper discusses the design development and construction of the BUGA Wood Pavilion: A segmented timber shell structure made of hollow cassette components. Particular\r\nemphasis lies on the technical challenges of the employed building system, notably structural design and analysis, detailing solutions and the construction process. The authors further describe the integrative structural design and optimization methods developed for the timber shell in question. The BUGA Wood Pavilion demonstrates\r\nthe possibilities of lightweight and sustainable wood architecture merging the merits of integrative design, structural engineering and high-tech robotic fabrication methods.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.istruc.2021.10.032", "bibtexKey": "bechert2021integrative" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/27e2ca5a3aff35c16bb99676c359876b3/itke", "tags" : [ "Finite","layup","fiber","knippers","2022","engineering","analysis","filament","Fiber-reinforced","itke","serhan","from:petraheim","winding","(FEA)","Lamination","parameters","methodology","components","guo","buckling","polymer","gil","wound","design","optimization","structural","(FRP)","element","Coreless","architecture" ], "intraHash" : "7e2ca5a3aff35c16bb99676c359876b3", "interHash" : "4f98bbc60a12e811d97756c7daf76b15", "label" : "A design methodology for fiber layup optimization of filament wound structural components", "user" : "itke", "description" : "", "date" : "2022-04-22 12:30:17", "changeDate" : "2022-04-22 10:30:17", "count" : 6, "pub-type": "article", "journal": "Structures","publisher":"ELSEVIER SCI LTD", "year": "2022", "url": "", "author": [ "Yanan Guo","Marta Gil Pérez","Gokhan Serhat","Jan Knippers" ], "authors": [ {"first" : "Yanan", "last" : "Guo"}, {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Gokhan", "last" : "Serhat"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "38","pages": "1125-1136","abstract": "The applications of fiber-reinforced polymer (FRP) composites extend rapidly along with the development of new manufacturing techniques. However, due to the complexities introduced by the material and fabrication processes, the application of conventional structural design methods for construction members has been significantly challenging. This paper presents an alternative methodology to find optimum fiber layups for a given tube-shape geometry via a graphical optimization strategy based on structural performance requirements. The proposed technique employs simplified shell element models based on classical lamination theory (CLT) to avoid explicit fiber modeling in the FEA simulations. Lamination parameters are utilized to generate the reduced stiffness matrices for continuous multi-layer FRP lamination. The fiber layup of the component is retrieved from the optimal lamination parameters that maximize the structural performance. The case study results demonstrate that the developed method provides compact solutions, linking the structural design requirements with optimal fiber orientations and volumetric proportions. In addition, the determined solutions can be interpreted directly by the winding fabrication settings.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.istruc.2022.02.048", "bibtexKey": "guo2022design" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/27e2ca5a3aff35c16bb99676c359876b3/petraheim", "tags" : [ "(FEA)","(FRP)","2022","Coreless","Fiber-reinforced","Finite","Lamination","analysis","architecture","buckling","components","design","element","engineering","fiber","filament","gil","guo","itke","knippers","layup","methodology","optimization","parameters","polymer","serhat","structural","winding","wound" ], "intraHash" : "7e2ca5a3aff35c16bb99676c359876b3", "interHash" : "4f98bbc60a12e811d97756c7daf76b15", "label" : "A design methodology for fiber layup optimization of filament wound structural components", "user" : "petraheim", "description" : "", "date" : "2022-03-02 09:39:23", "changeDate" : "2022-04-22 10:34:03", "count" : 6, "pub-type": "article", "journal": "Structures","publisher":"ELSEVIER SCI LTD", "year": "2022", "url": "", "author": [ "Yanan Guo","Marta Gil Pérez","Gokhan Serhat","Jan Knippers" ], "authors": [ {"first" : "Yanan", "last" : "Guo"}, {"first" : "Marta", "last" : "Gil Pérez"}, {"first" : "Gokhan", "last" : "Serhat"}, {"first" : "Jan", "last" : "Knippers"} ], "volume": "38","pages": "1125-1136","abstract": "The applications of fiber-reinforced polymer (FRP) composites extend rapidly along with the development of new manufacturing techniques. However, due to the complexities introduced by the material and fabrication processes, the application of conventional structural design methods for construction members has been significantly challenging. This paper presents an alternative methodology to find optimum fiber layups for a given tube-shape geometry via a graphical optimization strategy based on structural performance requirements. The proposed technique employs simplified shell element models based on classical lamination theory (CLT) to avoid explicit fiber modeling in the FEA simulations. Lamination parameters are utilized to generate the reduced stiffness matrices for continuous multi-layer FRP lamination. The fiber layup of the component is retrieved from the optimal lamination parameters that maximize the structural performance. The case study results demonstrate that the developed method provides compact solutions, linking the structural design requirements with optimal fiber orientations and volumetric proportions. In addition, the determined solutions can be interpreted directly by the winding fabrication settings.", "language" : "eng", "doi" : "https://doi.org/10.1016/j.istruc.2022.02.048", "bibtexKey": "guo2022design" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24227971b3516b084125d1b37e8dcbac0/petraheim", "tags" : [ "2012","algorithm","architecture","based","dimcic","diss","dissertation","engineering","forschungsbericht","from:petraheim","genetic","grid","itke","optimisation","optimization","shell","structural" ], "intraHash" : "4227971b3516b084125d1b37e8dcbac0", "interHash" : "62f2af1051cae336f6d6ec10e72fed49", "label" : "Structural Optimization of Grid Shells based on Genetic Algorithms", "user" : "petraheim", "description" : "", "date" : "2020-06-24 13:42:52", "changeDate" : "2021-07-01 13:01:33", "count" : 2, "pub-type": "phdthesis", "series": "Forschungsberichte aus dem Institut für Tragkonstruktionen und Konstruktives Entwerfen","publisher":"Stuttgart: Institut für Tragkonstruktionen und Konstruktives Entwerfen","address":"ITKE, Stuttgart, Germany", "year": "2012", "url": "", "author": [ "Milos Dimcic" ], "authors": [ {"first" : "Milos", "last" : "Dimcic"} ], "editor": [ "Jan Knippers" ], "editors": [ {"first" : "Jan", "last" : "Knippers"} ], "volume": "32","abstract": "In the 21st century, as free form design gains popularity, free-form grid shells are becoming a universal structural solution, enabling merger of structure and facade into a single layer - a skin [31]. The subject of the presented work is the optimization of grid structures over some predefined free form shape, with the goal of generating\r\na stable and statically efficient structure. It is shown how combining design and FEM software in an iterative, Genetic Algorithms based, optimization process, stress and displacements in grid shell structures can be significantly reduced, whereby material can be saved and stability enhanced.\r\nWithin this research, design and static analysis software are combined in order to perform a statical optimization of grid shells,generated over a given free form surface. A plug-in for Rhinoceros 3D (software based on NURBS [44] geometry representation) is developed, that uses Genetic Algorithms as an optimization method and implements automated iterative calls to Oasys GSA (commercial FEM static analysis software) in order to generate a statically optimal grid shell. To make this possible, within this research some new types of automatic grid generation are developed. Voronoi\r\ndiagrams [11] were used together with the adapted Force-Density method [38] to develop a new type of grid structure that we called Voronax. In the presented work it was shown that, using the same free form surface, and using the same number of joints and structural members, we can generate much more efficient grid shells,\r\nwhen compared to the standard (uniform) grid structures, simply by modifying the structural grid, i.e., rearranging the structural members of the grid shell.\r\nThe work presented offers an explanation of the entire method and how it can be constructed. The results of the experiments are there to prove its efficiency and credibility. Once it is proved that the method works, its application can take various forms and be left to the creativity of the user and the requirements of the\r\nspecific project.", "isbn" : "978-3-922302-32-2", "language" : "eng", "bibtexKey": "dimcic2012structural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2b3a4cc8d934e1b348514210472f85a33/itke", "tags" : [ "waimer","2013","magna","knippers","engineering","shell","nature-inspired","optimization","structural","itke","optimisation","from:petraheim","freeform","architecture" ], "intraHash" : "b3a4cc8d934e1b348514210472f85a33", "interHash" : "e8b58afc64283d3e1854def733d09923", "label" : "Nature-inspired structural optimization of freeform shells", "user" : "itke", "description" : "", "date" : "2020-05-22 14:23:59", "changeDate" : "2020-05-22 12:23:59", "count" : 2, "pub-type": "inproceedings", "booktitle": "ICSA 2013- Structures and Architecture","address":"Guimaraes, Portugal", "year": "2013", "url": "", "author": [ "Frédéric Waimer","Riccardo La magna","jan Knippers" ], "authors": [ {"first" : "Frédéric", "last" : "Waimer"}, {"first" : "Riccardo", "last" : "La magna"}, {"first" : "jan", "last" : "Knippers"} ], "language" : "eng", "bibtexKey": "waimer2013natureinspired" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24227971b3516b084125d1b37e8dcbac0/itke", "tags" : [ "2012","algorithm","architecture","based","dimcic","diss","dissertation","engineering","forschungsbericht","from:petraheim","genetic","grid","itke","optimisation","optimization","shell","structural" ], "intraHash" : "4227971b3516b084125d1b37e8dcbac0", "interHash" : "62f2af1051cae336f6d6ec10e72fed49", "label" : "Structural Optimization of Grid Shells based on Genetic Algorithms", "user" : "itke", "description" : "", "date" : "2020-05-22 14:20:03", "changeDate" : "2020-06-24 11:41:45", "count" : 2, "pub-type": "phdthesis", "series": "Forschungsberichte aus dem Institut für Tragkonstruktionen und Konstruktives Entwerfen","publisher":"Stuttgart: Institut für Tragkonstruktionen und Konstruktives Entwerfen","address":"ITKE, Stuttgart, Germany", "year": "2012", "url": "", "author": [ "Milos Dimcic" ], "authors": [ {"first" : "Milos", "last" : "Dimcic"} ], "editor": [ "Jan Knippers" ], "editors": [ {"first" : "Jan", "last" : "Knippers"} ], "volume": "32","abstract": "In the 21st century, as free form design gains popularity, free-form grid shells are becoming a universal structural solution, enabling merger of structure and facade into a single layer - a skin [31]. The subject of the presented work is the optimization of grid structures over some predefined free form shape, with the goal of generating\r\na stable and statically efficient structure. It is shown how combining design and FEM software in an iterative, Genetic Algorithms based, optimization process, stress and displacements in grid shell structures can be significantly reduced, whereby material can be saved and stability enhanced.\r\nWithin this research, design and static analysis software are combined in order to perform a statical optimization of grid shells,generated over a given free form surface. A plug-in for Rhinoceros 3D (software based on NURBS [44] geometry representation) is developed, that uses Genetic Algorithms as an optimization method and implements automated iterative calls to Oasys GSA (commercial FEM static analysis software) in order to generate a statically optimal grid shell. To make this possible, within this research some new types of automatic grid generation are developed. Voronoi\r\ndiagrams [11] were used together with the adapted Force-Density method [38] to develop a new type of grid structure that we called Voronax. In the presented work it was shown that, using the same free form surface, and using the same number of joints and structural members, we can generate much more efficient grid shells,\r\nwhen compared to the standard (uniform) grid structures, simply by modifying the structural grid, i.e., rearranging the structural members of the grid shell.\r\nThe work presented offers an explanation of the entire method and how it can be constructed. The results of the experiments are there to prove its efficiency and credibility. Once it is proved that the method works, its application can take various forms and be left to the creativity of the user and the requirements of the\r\nspecific project.", "isbn" : "978-3-922302-32-2", "language" : "eng", "bibtexKey": "dimcic2012structural" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2b3a4cc8d934e1b348514210472f85a33/petraheim", "tags" : [ "2013","architecture","engineering","freeform","itke","knippers","magna","nature-inspired","optimisation","optimization","shell","structural","waimer" ], "intraHash" : "b3a4cc8d934e1b348514210472f85a33", "interHash" : "e8b58afc64283d3e1854def733d09923", "label" : "Nature-inspired structural optimization of freeform shells", "user" : "petraheim", "description" : "", "date" : "2020-05-18 14:39:53", "changeDate" : "2020-06-02 10:08:53", "count" : 2, "pub-type": "inproceedings", "booktitle": "ICSA 2013- Structures and Architecture","address":"Guimaraes, Portugal", "year": "2013", "url": "", "author": [ "Frédéric Waimer","Riccardo La magna","jan Knippers" ], "authors": [ {"first" : "Frédéric", "last" : "Waimer"}, {"first" : "Riccardo", "last" : "La magna"}, {"first" : "jan", "last" : "Knippers"} ], "language" : "eng", "bibtexKey": "waimer2013natureinspired" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/270cd658f5aeddea66235eee1a073bec1/mgeiger", "tags" : [ "Actuators,","Controllability,","Damping,","Eigenvalues","Gramian,","Gramian-based","Mathematical","Measurement,","Optimization,","active","actuator","actuators,","adaptive","algebra,","and","control","control,","controllability","controllability,","criterion,","damping,","eigenfunctions,","engineering","external","externally","high-rise","induced","loads,","matrix","model,","models,","modes","modification,","optimal","optimisation,","optimization","order","placement,","reduced","reduction,","response","spillover","spillover,","structure,","structures,","supports,","systems,","truss","vibration","vibrations," ], "intraHash" : "70cd658f5aeddea66235eee1a073bec1", "interHash" : "53ad49f8e25468c63611b703749d7cd3", "label" : "Gramian-based actuator placement with spillover reduction for active damping of adaptive structures", "user" : "mgeiger", "description" : "", "date" : "2019-11-08 16:11:00", "changeDate" : "2019-11-08 15:14:53", "count" : 5, "pub-type": "inproceedings", "booktitle": "2017 IEEE International Conference on Advanced Intelligent Mechatronics (AIM), July 3-7, 2017, Munich", "year": "2017", "url": "", "author": [ "Michael Heidingsfeld","Philipp Rapp","Michael Böhm","Oliver Sawodny" ], "authors": [ {"first" : "Michael", "last" : "Heidingsfeld"}, {"first" : "Philipp", "last" : "Rapp"}, {"first" : "Michael", "last" : "Böhm"}, {"first" : "Oliver", "last" : "Sawodny"} ], "pages": "904--909","abstract": "Adaptive structures are engineering structures with the ability to modify their response to external loads. This includes active damping of externally induced vibrations. The controller design is usually based on reduced order models that comprise the most important vibration modes of the structure. This can lead to unwanted excitation of the neglected modes, known as control spillover. One means to cope with this problem is by proper placement of the actuators. In this contribution, we present a method for optimal actuator placement for active damping of adaptive structures that explicitly considers spillover effects by optimizing the trade-off between controllability of the considered and neglected modes. The optimization criterion is based on the controllability Gramian. Under certain conditions, the globally optimal solution can be found. The proposed method is applied to a numerical example of a high-rise truss structure.", "doi" : "10.1109/AIM.2017.8014133", "bibtexKey": "heidingsfeld_gramian-based_2017" } ] }