{ "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/2c3b6f1b52137054f3f44fa2d208a5532/lemloh", "tags" : [ "Bioaccumulation","Heavy","Metal-containing","Rare","depletion","earth","element","metal","myown","particle" ], "intraHash" : "c3b6f1b52137054f3f44fa2d208a5532", "interHash" : "930505dd8fa6b55b1f394cd6be38a5d1", "label" : "A common process of bioaccumulation of rare earth elements, iron, and aluminium in three Tetrahymena species", "user" : "lemloh", "description" : "", "date" : "2025-07-25 17:19:54", "changeDate" : "2025-07-25 17:19:54", "count" : 4, "pub-type": "article", "journal": "Ecotoxicology and Environmental Safety", "year": "2025", "url": "https://www.sciencedirect.com/science/article/pii/S0147651325009492", "author": [ "Jana Kohl-Chandramohan","Michael Schweikert","Tobias Junginger","Ingo Hartenbach","Marie-Louise Lemloh" ], "authors": [ {"first" : "Jana", "last" : "Kohl-Chandramohan"}, {"first" : "Michael", "last" : "Schweikert"}, {"first" : "Tobias", "last" : "Junginger"}, {"first" : "Ingo", "last" : "Hartenbach"}, {"first" : "Marie-Louise", "last" : "Lemloh"} ], "volume": "302","pages": "118604--","abstract": "Understanding how organisms interact with elements used in technical applications is essential because of the increasing prevalence of these elements in the environment. The unicellular eukaryote ciliate Tetrahymena can tolerate high concentrations of cytotoxic metals and is known to have developed several detoxification strategies, in particular the intracellular bioaccumulation. In this study, we systematically investigated the process of tolerance and intracellular bioaccumulation of several metals (La, Ce, Sm, Eu, Gd, Dy, Fe, and Al) in three species of the ciliate Tetrahymena (T. pyriformis, T. thermophila, and T. pigmentosa). In all three species and for all tested elements, treatment of the cells with dissolved metals in an organic growth medium leads to an intracellular bioaccumulation and formation of biogenic metal-containing particles within the food vacuoles of the cells. Stable particles are excreted into the surrounding medium within 2\u202Fh. The particles have a species-dependent diameter between 2.4 and 3.2\u202Fµm and consist of the respective added metal La, Ce, Sm, Eu, Gd, Dy, Fe, or Al together with the elements C, O, P, Na, Mg, K, and Ca. Intracellular bioaccumulation is associated with a 26\u201387\u202F% depletion of the rare earth element concentrations in the medium within 48\u202Fh. The understanding of microbial bioaccumulation pathways is a promising approach for the development of new bio-inspired strategies for recycling or remediation applications.", "issn" : "01476513", "doi" : "https://doi.org/10.1016/j.ecoenv.2025.118604", "bibtexKey": "kohlchandramohan2025common" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29e914ceab1b231a2ad91a1286ff12363/gkeck", "tags" : [ "zone;numerical","discrete","model;extrusion;grooved","feed","contact","conveying;superquadrics","element","method;elastic-plastic","simulation;regrind;solids" ], "intraHash" : "9e914ceab1b231a2ad91a1286ff12363", "interHash" : "9c5ddedd2950b4d9d31b23c50b3a81ef", "label" : "Enhanced Processing of Regrind as Recycling Material in Single-Screw Extruders", "user" : "gkeck", "description" : "", "date" : "2025-05-28 15:58:44", "changeDate" : "2025-05-28 15:58:44", "count" : 2, "pub-type": "article", "journal": "Polymers", "year": "2021", "url": "", "author": [ "Philipp Thieleke","Christian Bonten" ], "authors": [ {"first" : "Philipp", "last" : "Thieleke"}, {"first" : "Christian", "last" : "Bonten"} ], "volume": "13","number": "10", "doi" : "10.3390/polym13101540", "bibtexKey": "Thieleke.2021" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29248d60b51d940e72d252bd41aeac060/walthermaier", "tags" : [ "CEL","Euler","Finite","Lagrangian","Method","SLD","breaking","chip","deep","drilling","element","hole","ifw","simulation" ], "intraHash" : "9248d60b51d940e72d252bd41aeac060", "interHash" : "6d8b14b29e7b0ccac37c6d71a8526017", "label" : "Coupled Eulerian-Lagrangian (CEL) simulation of the chip breaking in a single lip deep hole drilling process (SLD)", "user" : "walthermaier", "description" : "", "date" : "2025-05-05 13:49:40", "changeDate" : "2025-05-05 13:49:40", "count" : 2, "pub-type": "article", "journal": "Procedia CIRP","publisher":"Elsevier BV", "year": "2025", "url": "http://dx.doi.org/10.1016/j.procir.2025.02.014", "author": [ "Walther Maier","Johannes Ramme","Moritz Dingler","Hans-Christian Möhring" ], "authors": [ {"first" : "Walther", "last" : "Maier"}, {"first" : "Johannes", "last" : "Ramme"}, {"first" : "Moritz", "last" : "Dingler"}, {"first" : "Hans-Christian", "last" : "Möhring"} ], "volume": "133","number": "(2)","pages": "72\u201377","abstract": "In this work, chip formation is optimized with Coupled Eulerian-Lagrangian (CEL) simulation starting with developed helical workpiece. The chips generated in the simulation are compared with the chip shapes from experimental deep hole drilling. The results of the simulations document the drilling process based on the angle of rotation and the simulation time. The chip formation on the inner and outer cutting edge of the drilling tool is shown in 3D. Chip breaking with and without pulsation as well as simulations with different pulsation amplitudes, are compared.", "issn" : "2212-8271", "doi" : "10.1016/j.procir.2025.02.014", "bibtexKey": "Maier_2025" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29248d60b51d940e72d252bd41aeac060/veroeff_ifw", "tags" : [ "Finite","Lagrangian","chip","deep","simulation","CEL","Method","Euler","SLD","drilling","hole","element","ifw","breaking" ], "intraHash" : "9248d60b51d940e72d252bd41aeac060", "interHash" : "6d8b14b29e7b0ccac37c6d71a8526017", "label" : "Coupled Eulerian-Lagrangian (CEL) simulation of the chip breaking in a single lip deep hole drilling process (SLD)", "user" : "veroeff_ifw", "description" : "", "date" : "2025-05-05 13:49:40", "changeDate" : "2025-05-05 13:49:40", "count" : 2, "pub-type": "article", "journal": "Procedia CIRP","publisher":"Elsevier BV", "year": "2025", "url": "http://dx.doi.org/10.1016/j.procir.2025.02.014", "author": [ "Walther Maier","Johannes Ramme","Moritz Dingler","Hans-Christian Möhring" ], "authors": [ {"first" : "Walther", "last" : "Maier"}, {"first" : "Johannes", "last" : "Ramme"}, {"first" : "Moritz", "last" : "Dingler"}, {"first" : "Hans-Christian", "last" : "Möhring"} ], "volume": "133","number": "(2)","pages": "72\u201377","abstract": "In this work, chip formation is optimized with Coupled Eulerian-Lagrangian (CEL) simulation starting with developed helical workpiece. The chips generated in the simulation are compared with the chip shapes from experimental deep hole drilling. The results of the simulations document the drilling process based on the angle of rotation and the simulation time. The chip formation on the inner and outer cutting edge of the drilling tool is shown in 3D. Chip breaking with and without pulsation as well as simulations with different pulsation amplitudes, are compared.", "issn" : "2212-8271", "doi" : "10.1016/j.procir.2025.02.014", "bibtexKey": "Maier_2025" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/28a0adca701ecec9c8466f065b61025c4/mhahn", "tags" : [ "Airy","Continuum","Discrete","Element","Fracture,","Framework","Lattice","Material","Method,","Spring","function,","isd","myown","stress" ], "intraHash" : "8a0adca701ecec9c8466f065b61025c4", "interHash" : "8d8876703cba4f69fedbe0f9a848cb57", "label" : "Discrete element representation of continua: Proof of concept and determination of the material parameters", "user" : "mhahn", "description" : "", "date" : "2024-11-05 17:39:35", "changeDate" : "2024-11-05 17:39:35", "count" : 2, "pub-type": "article", "journal": "Computational Materials Science", "year": "2010", "url": "https://www.sciencedirect.com/science/article/pii/S0927025610005008", "author": [ "Manfred Hahn","Thomas Wallmersperger","Bernd-H. Kröplin" ], "authors": [ {"first" : "Manfred", "last" : "Hahn"}, {"first" : "Thomas", "last" : "Wallmersperger"}, {"first" : "Bernd-H.", "last" : "Kröplin"} ], "volume": "50","number": "2","pages": "391-402","abstract": "A common approach for the modelling of metal or microfibre reinforced materials is to see these materials as a continuum on the macro scale. A major drawback is that an equation based on the continuum theory is unable to predict the various complicated microscopic effects, even though those effects have a strong influence on the macroscopic behaviour, e.g. on fracture, fatigue and life time. A large number of attempts has been made to correct the shortcomings of the continuum-based theories. One interesting alternative to common approaches for the numerical modelling of discontinuous materials is the Discrete Element Method (DEM). Within the DEM, the individual particles are modelled as stiff (or rigid) bodies which interact via contact forces. This simplification has the advantage of the complicated microscopic behaviour being represented by a simple system of linear equations based on a relatively small number of parameters. This paper describes the requirement for new computational methods for the modelling of fracture mechanics. First of all a proof of the described method will be shown. Then two examples are presented in order to verify the Discrete Element Method. Furthermore it will be shown how the corresponding material parameters are gained and implemented and how the boundary conditions have to be modelled in order to achieve exact results for the stress and strain fields of 2D shells.", "language" : "Englisch", "issn" : "0927-0256", "doi" : "https://doi.org/10.1016/j.commatsci.2010.08.031", "bibtexKey": "HAHN2010391" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/23cf357e5fab8091577fb8277627d764c/mhahn", "tags" : [ "Continuum","Discrete","Element","Fracture","Framework","Lattice","Material","Method","Model","isd","myown" ], "intraHash" : "3cf357e5fab8091577fb8277627d764c", "interHash" : "6df393aa802b448c156cb19600e1eb0c", "label" : "Discrete Element Method for the thermal field: Proof of concept and determination of the material parameters", "user" : "mhahn", "description" : "", "date" : "2024-11-05 17:34:21", "changeDate" : "2024-11-05 17:40:31", "count" : 2, "pub-type": "article", "journal": "Computational Materials Science", "year": "2011", "url": "https://www.sciencedirect.com/science/article/pii/S0927025611002370", "author": [ "Manfred Hahn","Mathias Schwarz","Bernd-H. Kröplin","Thomas Wallmersperger" ], "authors": [ {"first" : "Manfred", "last" : "Hahn"}, {"first" : "Mathias", "last" : "Schwarz"}, {"first" : "Bernd-H.", "last" : "Kröplin"}, {"first" : "Thomas", "last" : "Wallmersperger"} ], "volume": "50","number": "10","pages": "2771-2784","abstract": "The physical behaviour of materials and complicated components is nowadays numerically predicted by using the Finite Element Method (FEM). Another method, older than the finite element idea, is the Discrete Element Method (DEM), with which it is possible to make continuum-based calculations not only in the mechanical field but also in the thermal field, as will be shown in this paper. One major drawback of the FEM is that continuum-based methods are unable to include the stochastically distributed microscopic effects in the macroscopically oriented calculations. The Discrete Element Method is one method with which these effects can be considered. For making realistic fracture and life time predictions for components at high temperatures, it is important to adapt the DEM for the thermal field. This paper describes the mathematical proof of the 2D Discrete Element Method (or Lattice Model) for the thermal field. It will specifically be shown that the heat flux inside the framework can be transferred to the heat conduction equation. Furthermore, some examples demonstrate how the heat flux can be calculated with this method and how the corresponding material parameters are found and implemented. Also, as will be shown in this paper, anisotropic or orthotropic heat flux effects can be integrated in the DEM model.", "language" : "Englisch", "issn" : "0927-0256", "doi" : "https://doi.org/10.1016/j.commatsci.2011.04.028", "bibtexKey": "HAHN20112771" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d039e8c24ebde8350d35d5245aae735f/rkavalenta", "tags" : [ "aneurysm","cerebral","element","finite","flow-diverting","hemodynamics","modeling","patient","specific","stent","test_bmt","thrombosis","cardiovascularSystem","fluidDynamics" ], "intraHash" : "d039e8c24ebde8350d35d5245aae735f", "interHash" : "c7cb0cfb109625ad5fd1963128532723", "label" : "Personalizing flow-diverter intervention for cerebral aneurysms: from computational hemodynamics to biochemical modeling", "user" : "rkavalenta", "description" : "", "date" : "2024-01-30 13:22:45", "changeDate" : "2024-02-01 09:53:18", "count" : 2, "pub-type": "article", "journal": "International Journal for Numerical Methods in Biomedical Engineering", "year": "2014", "url": "https://doi.org/10.1002/cnm.2663", "author": [ "T. W. Peach","M. Ngoepe","K. Spranger","D. Zajarias-Fainsod","Y. Ventikos" ], "authors": [ {"first" : "T. W.", "last" : "Peach"}, {"first" : "M.", "last" : "Ngoepe"}, {"first" : "K.", "last" : "Spranger"}, {"first" : "D.", "last" : "Zajarias-Fainsod"}, {"first" : "Y.", "last" : "Ventikos"} ], "volume": "30","number": "11","pages": "1387--1407","abstract": "SUMMARY This paper presents the computational modeling of a variety of flow-diverting stents, deployed in a number of patient-specific aneurysm geometries. We consider virtual device deployment and hemodynamics as well as thrombus formation, with the scope to assess pre-operatively the efficacy of specific devices in treating particular aneurysms. An algorithm based on a linear and torsional spring analogy is developed for the fast virtual deployment of stents and similar minimally invasive devices in patient-specific vessel geometries. The virtual deployment algorithm is used to accurately deploy a total of four stent designs in three aneurysm geometries. A variety of different flow-diverting stent designs, representing the commercially available and the entirely novel, are presented, varying in both mesh design and porosity. Transient computational hemodynamics simulations are performed on multiple patient-specific geometries to predict the reduction in aneurysm inflow after the deployment of each device. Further, a thrombosis initiation and growth model is implemented, coupled with the hemodynamic computations. Hemodynamic simulations show large variations in flow reduction between devices and across different aneurysm geometries. The industry standard of flow-diverters with 70% porosity, assumed to offer the best compromise in flexibility and flow reduction, is challenged in at least one aneurysm geometry. Copyright ? 2014 John Wiley & Sons, Ltd.", "issn" : "20407939", "doi" : "https://doi.org/10.1002/cnm.2663", "bibtexKey": "peach2014personalizing" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/24c2fba5abd3be1a2cbd76e282693e0df/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "4c2fba5abd3be1a2cbd76e282693e0df", "interHash" : "60f62d6bbc113e11c77620de70afadd0", "label" : "Development of a sustainable construction method for segmented thin walled concrete structures", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Concrete Structures for Sustainable Community, FIB Symposium, June 11-14, 2012, Stockholm","publisher":"Swedish Concrete Association","address":"Stockholm", "year": "2012", "url": "", "author": [ "Werner Sobek","Jan Mittelstädt" ], "authors": [ {"first" : "Werner", "last" : "Sobek"}, {"first" : "Jan", "last" : "Mittelstädt"} ], "pages": "567--570","abstract": "Mass reduction and saving of resources due to an application of new high-tech material com-bined with a focus on the design for recyclability of structural elements requires the develop-ment of new construction methods. This paper presents exemplarily first steps in the development of a construction method by point connections for thin walled, prefabricated, geometrically flexible and architecturally pleasant elements made of ultra-high-performance fiber reinforced concrete (UHPFRC) by the use of implants. General design issues of the implant construction, aspects on the design for assembly, disassembly and recyclability and first experimental results are presented that illustrate the enormous potential of this new construction method.", "isbn" : "978-91-980098-1-1", "bibtexKey": "sobek_development_2012" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2efa35ed93067fc38ece40d8b442a967b/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "efa35ed93067fc38ece40d8b442a967b", "interHash" : "ba6b7445bad031174a6c73386630a76f", "label" : "Thin walled elements made of UHPFRC - connection and load transfer by the use of implants", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Engineering a Concrete Future - Technology, Modeling and Construction, FIB Symposium, April 22-24, 2013, Tel-Aviv, Israel","publisher":"Israel Institute of Technology","address":"Tel-Aviv", "year": "2013", "url": "", "author": [ "Werner Sobek","Jan Mittelstädt" ], "authors": [ {"first" : "Werner", "last" : "Sobek"}, {"first" : "Jan", "last" : "Mittelstädt"} ], "pages": "193--196","abstract": "The practical application of a new high-tech material such as ultra-high performance fibre reinforced concrete (UHPFRC) requires the development of appropriate construction technologies. These technologies have to fully utilise the material's advantageous properties. They also have to consider the material's requirements with regard to production accurateness. This paper presents a construction technology for prefabricated thin-walled elements made of UHPFRC. The technology developed by the authors allows for an easy assembly, disassembly and recyclability of the UHPFRC elements, making maximum use of the material's properties. The construction technology uses built-in parts, so called implants, to pointwise connect thin-walled elements and to transfer high connection forces. The paper explains the general design of the implant components as well as their load-bearing behaviour under punctual compression loads.", "bibtexKey": "sobek_thin_2013" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2c29141035f570cda80fb93ec5bcffeff/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "c29141035f570cda80fb93ec5bcffeff", "interHash" : "3233769dc419ff9cffe0e42e94d6be35", "label" : "Conceptual design of an UHPFRC tower structure in segmental construction for offshore wind turbines", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Designing and building with UHPFRC - from innovation to large-scale realizations, RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete, October 1-3, 2013, Marseille, France","publisher":"RILEM","address":"Bagneux", "year": "2013", "url": "", "author": [ "Werner Sobek","Markus Plank","Björn Frettlöhr","Jochen Röhm","Dominique Corvez" ], "authors": [ {"first" : "Werner", "last" : "Sobek"}, {"first" : "Markus", "last" : "Plank"}, {"first" : "Björn", "last" : "Frettlöhr"}, {"first" : "Jochen", "last" : "Röhm"}, {"first" : "Dominique", "last" : "Corvez"} ], "pages": "423--432","abstract": "Apart from a few limited exceptions the vast majority of offshore wind turbines consist of substructures and towers made of steel. Some innovative concepts use gravity based hybrid constructions.\nAn economically and ecologically promising alternative could be the substitution of the steel tower by a centrically prestressed tower that combines the use of ultra-high performance fibre reinforced concrete (UHPFRC) with the segmental construction method.\nIn this paper the concept of the UHPFRC tower structure is presented. Within the limits of the conceptual design an Eigen frequency analysis was conducted. The results of the analysis were evaluated with respect to the Campbell-Diagram and point to the feasibility of this innovative concept.", "bibtexKey": "sobek_conceptual_2013" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/27af8c6ea1056c8a9009ee8cfbd042cea/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "7af8c6ea1056c8a9009ee8cfbd042cea", "interHash" : "3e80fbe3fdf985dfb157a9bf4e653e9b", "label" : "The glass screens of the Japan Post Tower", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Challenging Glass 3, Conference on Architectural and Structural Applications of Glass, June 28-29, 2012, Delft","publisher":"IOS Press","address":"Amsterdam", "year": "2012", "url": "", "author": [ "Lucio Blandini","Werner Sobek" ], "authors": [ {"first" : "Lucio", "last" : "Blandini"}, {"first" : "Werner", "last" : "Sobek"} ], "pages": "41--46", "bibtexKey": "blandini_glass_2012" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2a7f0267dc69c70c59db88858c05ef26b/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "a7f0267dc69c70c59db88858c05ef26b", "interHash" : "d5beae450163aebab6008964703b926e", "label" : "New Corinthians Stadium in São Paulo", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Beyond the Limits of Man, IASS Symposium, September 23-27, 2013, Wroclaw, Poland", "year": "2013", "url": "", "author": [ "Werner Sobek","Stephen Hagenmayer","Andreas Hoier","Kerstin Wolff" ], "authors": [ {"first" : "Werner", "last" : "Sobek"}, {"first" : "Stephen", "last" : "Hagenmayer"}, {"first" : "Andreas", "last" : "Hoier"}, {"first" : "Kerstin", "last" : "Wolff"} ], "pages": "Paper 1270","abstract": "Even though the Sport Club Corinthians Paulista has one of the most successful soccer teams in Brazil, the club has been waiting for decades for its own stadium. With the FIFA decision that the world cup 2014 will take in Brazil, the Corinthians were able to find sufficient financial\nsupport for the new Corinthians Arena. The team of Werner Sobek Stuttgart was selected for the design development of the concrete structure, and for all design phases of the very slender and elegant steel roof structure which spans almost 200 m with a perceptible structural height of 3 m only. The following article describes briefly the stadium design, and explains in detail the structural systems of the concrete structure and the steel roof. The\narticle concludes with an explanation of the construction sequences and the structural analysis.", "bibtexKey": "sobek_new_2013" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/22f2c5dcacbc04960332a916f8c403af4/jmueller", "tags" : [ "(structures),","actuators,","analysis,","annealing","damping,","element","equations,","finite","flexible","mathematical","model,","observability,","optimization,","placement,","sensor","shells","simulated","sobek","strain,","structures," ], "intraHash" : "2f2c5dcacbc04960332a916f8c403af4", "interHash" : "22dc8d6520be48dbc1e24df7a3376f73", "label" : "Optimal sensor placement for state estimation of flexible shell structures", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 2, "pub-type": "inproceedings", "booktitle": "2011 International Conference on Fluid Power and Mechatronics (FPM), August 17-20, 2011, Beijing, China", "year": "2011", "url": "", "author": [ "Martin Weickgenannt","Stefan Neuhäuser","Benjamin Henke","Werner Sobek","Oliver Sawodny" ], "authors": [ {"first" : "Martin", "last" : "Weickgenannt"}, {"first" : "Stefan", "last" : "Neuhäuser"}, {"first" : "Benjamin", "last" : "Henke"}, {"first" : "Werner", "last" : "Sobek"}, {"first" : "Oliver", "last" : "Sawodny"} ], "pages": "374--380","abstract": "This paper presents a method for optimal sensor placement for flexible shell structures. The optimization objectives are the number of sensors, as a surrogate for implementation cost, and an observability measure. The latter is derived from the observability gramian and considers observation energy of the least observable state. The methodology is tested on a flexible thin-shell structure that is modeled using Finite Element methods. The equations of motion are transformed into modal space and model reduction methods are applied. The resulting model is used for the optimization of the sensor locations. The optimization is performed by the Multi-objective Simulated Annealing algorithm that uses a dominance-based energy formulation for the comparison of different optimal solution candidates. 2011 IEEE.", "doi" : "10.1109/FPM.2011.6045791", "bibtexKey": "weickgenannt_optimal_2011" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/20ab249ebfaed60085998c71ebfe15e58/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "0ab249ebfaed60085998c71ebfe15e58", "interHash" : "586b3ebd4ba57eefcc0f98931ca735bc", "label" : "Zur Gradientenbetontechnologie und deren Anwendung auf gewichtsreduzierte einachsige Bauteile", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Deutscher Bautechnik-Tag, 11.-12. April 2013, Hamburg", "year": "2013", "url": "", "author": [ "Michael Herrmann","Werner Sobek" ], "authors": [ {"first" : "Michael", "last" : "Herrmann"}, {"first" : "Werner", "last" : "Sobek"} ], "bibtexKey": "herrmann_zur_2013" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2e5b06dbe9387444db1b6a1fc5c85943f/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "e5b06dbe9387444db1b6a1fc5c85943f", "interHash" : "78e595b15b4d58123c4503eb65d58d9f", "label" : "Advantages of switchable glazing for architectural applications based on liquid crystal technology", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Challenging Glass 1, Conference on Architectural and Structural Applications of Glass, May 22-23, 2008, Delft","publisher":"IOS Press","address":"Amsterdam", "year": "2008", "url": "", "author": [ "Walter Haase","Werner Sobek" ], "authors": [ {"first" : "Walter", "last" : "Haase"}, {"first" : "Werner", "last" : "Sobek"} ], "pages": "591--600","abstract": "Window units must satisfy numerous criteria, on the one hand allowing an unobstructed view of the exterior but also providing the desired amount of protection from direct sunlight and the associated heat transfer. In order to optimize the performance of windows under varying conditions, much effort has been directed towards the development of adaptive glazing systems based on smart materials. This article will outline the functional principles and properties of the most promising of such systems. By modifying conventional liquid crystal technologies used for display screens and introducing new materials and processes, a switchable glazing system with unique and promising characteristics was developed by the author. The functional principle and the advantages of this adaptive system over comparable systems are further presented herein.", "bibtexKey": "haase_advantages_2008" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/29d50524ab0b1b07e96bba266c4259f45/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "9d50524ab0b1b07e96bba266c4259f45", "interHash" : "aad6594781d894cf5b687121c6196ec3", "label" : "Experimental determination of the load-bearing behaviour of dry joints between precast elements made of UHPFRC", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Designing and building with UHPFRC - from innovation to large-scale realizations, RILEM-fib-AFGC International Symposium on Ultra-High Performance Fibre-Reinforced Concrete, October 1-3, 2013, Marseille, France","publisher":"RILEM","address":"Bagneux", "year": "2013", "url": "", "author": [ "Werner Sobek","Markus Plank","Dominique Corvez","Karl-Heinz Reineck" ], "authors": [ {"first" : "Werner", "last" : "Sobek"}, {"first" : "Markus", "last" : "Plank"}, {"first" : "Dominique", "last" : "Corvez"}, {"first" : "Karl-Heinz", "last" : "Reineck"} ], "pages": "607--616","abstract": "The application of ultra-high performance fibre reinforced concrete (UHPFRC) in structures entails in general the application of precast elements. Therefore the issue of how to join the elements is of highest importance. Dry joints allow the transfer of compressive and shear forces, whereby the magnitude of the transferable shear force depends amongst others on the cohesion factor and the friction coefficient. Values for these are stated in the respective design codes depending on the roughness of the joint surface. However, the classification of the surface roughness is often not very exact so that an experimental verification of the cohesion factor and the friction coefficient is advisable.\nLafarge commissioned the Institute for Lightweight Structures and Conceptual Design (ILEK) at the University of Stuttgart to carry out an experimental investigation to determine the effect of different surface roughnesses on the load-bearing behaviour of dry joints between precast elements made of UHPFRC.", "bibtexKey": "sobek_experimental_2013" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/25d8fb6805dcc43831c4ea62e117819bd/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "5d8fb6805dcc43831c4ea62e117819bd", "interHash" : "12b0c04371ad40e3ccda3be668f24b94", "label" : "Active vibration control of a double-curved shell structure using the example of Stuttgart SmartShell", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "ASME 2012 International Mechanical Engineering Congress & Exposition, IMECE 2012, November 9-15, 2012, Houston, TX, USA", "year": "2012", "url": "", "author": [ "Martin Weickgenannt","Oliver Sawodny","Stefan Neuhäuser","Werner Sobek" ], "authors": [ {"first" : "Martin", "last" : "Weickgenannt"}, {"first" : "Oliver", "last" : "Sawodny"}, {"first" : "Stefan", "last" : "Neuhäuser"}, {"first" : "Werner", "last" : "Sobek"} ], "bibtexKey": "weickgenannt_active_2012" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2ddae02a175b7a6ae08e9da33e3bba5a6/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "ddae02a175b7a6ae08e9da33e3bba5a6", "interHash" : "3cd53297dbc5f892823938108e0da614", "label" : "ILEK\\_Lab - experimental approaches in architectural education", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "Beyond the Limits of Man, IASS Symposium, September 23-27, 2013, Wroclaw, Poland", "year": "2013", "url": "", "author": [ "Christoph Witte","Stefan Neuhäuser","Jonathan Busse","Werner Sobek" ], "authors": [ {"first" : "Christoph", "last" : "Witte"}, {"first" : "Stefan", "last" : "Neuhäuser"}, {"first" : "Jonathan", "last" : "Busse"}, {"first" : "Werner", "last" : "Sobek"} ], "pages": "Paper 1272","abstract": "The following contribution discusses the results of a recently implemented workshop concept in architectural education. Following an experimental approach towards the exploration of new technologies within an interdisciplinary setting, students are encouraged to develop innovative ideas from a variety of subject areas not necessarily linked to architecture, and to explore their application and opportunities in an architectural con-text. A selection of resulting projects is presented along with a discussion of the benefits of the educational approach.", "bibtexKey": "witte_ilek_lab_2013" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2ae111d8b504f54e6081e2c198f09d457/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "ae111d8b504f54e6081e2c198f09d457", "interHash" : "20a98c7a265ac07e52d307bc92a5911d", "label" : "Optimal sensor placement for state estimation of a thin double-curved shell structure", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 2, "pub-type": "article", "journal": "Mechatronics", "year": "2013", "url": "", "author": [ "Martin Weickgenannt","Stefan Neuhäuser","Benjamin Henke","Werner Sobek","Oliver Sawodny" ], "authors": [ {"first" : "Martin", "last" : "Weickgenannt"}, {"first" : "Stefan", "last" : "Neuhäuser"}, {"first" : "Benjamin", "last" : "Henke"}, {"first" : "Werner", "last" : "Sobek"}, {"first" : "Oliver", "last" : "Sawodny"} ], "volume": "23","number": "3","pages": "346--354","abstract": "Thin double-curved shell structures are often found in architecture and engineering when large areas are spanned without intermediate supports. Due to their large span and low weight, the influence of external loads, like snow and wind, is significant and may lead to inefficiencies in the load bearing behavior as well as induce vibrations. Research has shown that such negative effects can be compensated by adding active components to the structure, allowing a load- and oscillation-dependent response to improve structural stability. A principal requirement of such systems is the determination of the current state through the implementation of appropriate sensors. This paper presents a method for optimal sensor placement on shell structures such that the state of oscillation of the system can be reconstructed and model-based methods for active vibration damping can be applied. The method uses the number of sensors as a surrogate for implementation cost and an observability measure as optimization objectives. The latter is derived from the observability gramian and considers the average observation energy. The influence of measurement noise and model uncertainties on the observability of the system is taken into account explicitly. The method is tested on a flexible thin shell structure that is modeled by Finite Element Methods using ANSYS. The equations of motion are transformed into modal space where model reduction methods are applied. The resulting model is used to optimize the sensor locations. The optimization is performed by the Multi-objective Simulated Annealing algorithm. The proposed concept is tested on an experimental plant and optimization results and exemplary optimal sensor configurations are presented. © 2013 Elsevier Ltd. All rights reserved.", "doi" : "10.1016/j.mechatronics.2013.01.009", "bibtexKey": "weickgenannt_optimal_2013" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2bb3bfbeb560d248a977e358ef37eb9f3/jmueller", "tags" : [ "Equations","Finite","Mechatronics,","Multiobjective","Observability,","Sensors,","Simulated","State","Structural","annealing,","element","estimation","method,","motion,","of","optimization,","sobek" ], "intraHash" : "bb3bfbeb560d248a977e358ef37eb9f3", "interHash" : "21b88514fe92cdf69b64fcb6355ca98b", "label" : "Pull out tests on thin walled elements made of UHPFRC - experimental study", "user" : "jmueller", "description" : "", "date" : "2023-11-27 15:10:57", "changeDate" : "2023-11-27 15:10:57", "count" : 1, "pub-type": "inproceedings", "booktitle": "4th Bond in Concrete Conference, June 17-20, 2012, Brescia, Italy","publisher":"Publisher Creations","address":"Manerbio, Brescia", "year": "2012", "url": "", "author": [ "Jan Mittelstädt","Werner Sobek" ], "authors": [ {"first" : "Jan", "last" : "Mittelstädt"}, {"first" : "Werner", "last" : "Sobek"} ], "volume": "2","pages": "915--922","abstract": "The development of new high tech materials, as being considered in this paper by ultra-high performance fiber reinforced concrete (UHPFRC), enables new possibilities for the structural design of thin walled, geometrical flexible, durable and aesthetically pleasant structures. As being part of the development of a construction technique for thin walled elements made of UHPFRC by the use of implants, the design of structural components, carrying the tensile forces in the area of load introductions and connections, is being required and will be presented in this paper. An experimental study on pull out tests on thin walled elements made of UHPFRC was carried out to analyze the general bond behavior of thin, perforated and armatured steel sheets. The influence of geometrical and boundary conditions as well as the variation constructive parameters will be presented. The focus of investigation was on the maximal pull out force, bond strength, cracking and splitting behavior of the samples.", "isbn" : "978-88-907078-3-4", "bibtexKey": "mittelstadt_pull_2012" } ] }