@inproceedings{Oestman1997, author = {{\"O}stman, L.}, title = {Knowledge Elicitation through a Pragmatic Inquiry}, doi = {10.25643/bauhaus-universitaet.454}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4547}, year = {1997}, abstract = {This is a paper about knowledge in design and how to elicit knowledge from design processes. The paper is a preparation for an empirical study of interaction in the design process. Reasonings of three authors - Sch{\"o}n, Broadbent and Lundequist - on design processes is presented. They all have a pragmatic perspective in common, and regard the process as an activity without a definite form. Design is seen as an activity of creating models of forms and shapes, by addressing expert knowledge ­ in a dialogic way ­ to problematic situations. Due to the pragmatic approach I find the pragmatist Dewey´s understanding of knowledge and elecitation of knowledge appropiate for studying design processes. According to him it is possible to build up objectified descriptions of experiences, also of such, which are based on experiences of emotional and intuitive nature. There need not be a definite border, which separates tacit knowledge from explicit knowledge - when it comes to the question of the possibility of verbal descriptions. Tacit knowledge is possible to articulate within pragmatic thinking. The conclusion is, that it is possible to study the tacit knowledge of design processes, and get some qualitative insights useful for theory building. A study of design processes can look at three different forms of knowledge. It appears as a pre­cognitive understanding of the design situation, as integrated in the design activity - seeing the situation as something known - and in the process of creating something new.}, subject = {Entwurf}, language = {en} } @inproceedings{ZolotovAkimovSidorov, author = {Zolotov, Alexander B. and Akimov, Pavel and Sidorov, Vladimir}, title = {DISCRETE-CONTINUAL BOUNDARY ELEMENT METHODS OF ANALYSIS FOR TWO-DIMENSIONAL AND THREE-DIMENSIONAL STRUCTURES}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3041}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30419}, pages = {22}, abstract = {The aim of this paper is to present so-called discrete-continual boundary element method (DCBEM) of structural analysis. Its field of application comprises buildings constructions, structures and also parts and components for the residential, commercial and un-inhabitant structures with invariability of physical and geometrical parameters in some dimensions. We should mention here in particular such objects as beams, thin-walled bars, strip foundations, plates, shells, deep beams, high-rise buildings, extensional buildings, pipelines, rails, dams and others. DCBEM comes under group of semianalytical methods. Semianalytical formulations are contemporary mathematical models which currently becoming available for realization due to substantial speed-up of computer productivity. DCBEM is based on the theory of the pseudodifferential boundary equations. Corresponding pseudodifferential operators are discretely approximated using Fourier analysis or wavelet analysis. The main DCBEM advantages against the other methods of the numerical analysis is a double reduction in dimension of the problem (discrete numerical division applied not to the full region of the interest but only to the boundary of the region cross section, as a matter of fact one is solving an one-dimensional problem with the finite step on the boundary area of the region), one has opportunities to carrying out very detailed analysis of the specific chosen zones, simplified initial data preparation, simplistic and adaptive algorithms. There are two methods to define and conduct DCBEM analysis developed - indirect (IDCBEM) and direct (DDCBEM), thus indirect like in boundary element method (BEM) applied and used little bit more than direct.}, subject = {Architektur }, language = {en} } @inproceedings{ZimmermannBartels, author = {Zimmermann, J{\"u}rgen and Bartels, Jan-Hendrik}, title = {TREE-BASED METHODS FOR RESOURCE INVESTMENT AND RESOURCE LEVELLING PROBLEMS}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3040}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30405}, pages = {6}, abstract = {The execution of project activities generally requires the use of (renewable) resources like machines, equipment or manpower. The resource allocation problem consists in assigning time intervals to the execution of the project activities while taking into account temporal constraints between activities emanating from technological or organizational requirements and costs incurred by the resource allocation. If the total procurement cost of the different renewable resources has to be minimized we speak of a resource investment problem. If the cost depends on the smoothness of the resource utilization over time the underlying problem is called a resource levelling problem. In this paper we consider a new tree-based enumeration method for solving resource investment and resource levelling problems exploiting some fundamental properties of spanning trees. The enumeration scheme is embedded in a branch-and-bound procedure using a workload-based lower bound and a depth first search. Preliminary computational results show that the proposed procedure is promising for instances with up to 30 activities.}, subject = {Architektur }, language = {en} } @inproceedings{ZangSommer, author = {Zang, Di and Sommer, G.}, title = {ALGEBRAICALLY EXTENDED 2D IMAGE REPRESENTATION}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3039}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30396}, pages = {10}, abstract = {We present an algebraically extended 2D image representation in this paper. In order to obtain more degrees of freedom, a 2D image is embedded into a certain geometric algebra. Combining methods of differential geometry, tensor algebra, monogenic signal and quadrature filter, the novel 2D image representation can be derived as the monogenic extension of a curvature tensor. The 2D spherical harmonics are employed as basis functions to construct the algebraically extended 2D image representation. From this representation, the monogenic signal and the monogenic curvature signal for modeling intrinsically one and two dimensional (i1D/i2D) structures are obtained as special cases. Local features of amplitude, phase and orientation can be extracted at the same time in this unique framework. Compared with the related work, our approach has the advantage of simultaneous estimation of local phase and orientation. The main contribution is the rotationally invariant phase estimation, which enables phase-based processing in many computer vision tasks.}, subject = {Architektur }, language = {en} } @inproceedings{WoszczynaKaminskiMajetal., author = {Woszczyna, Anna and Kaminski, Mieczysław and Maj, Marek and Ubysz, Andrzej}, title = {ANALYSING THE INFLUENCE OF THE REINFORCED CONCRETE CHIMNEY GEOMETRY CHANGES ON THE STRESSES IN THE CHIMNEY SHAFT}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3038}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30388}, pages = {7}, abstract = {Analysis of the reinforced concrete chimney geometry changes and their influence on the stresses in the chimney mantle was made. All the changes were introduced to a model chimney and compared. Relations between the stresses in the mantle of the chimney and the deformations determined by the change of the chimney's vertical axis geometry were investigated. The vertical axis of chimney was described by linear function (corresponding to the real rotation of the chimney together with the foundation), and by parabolic function (corresponding to the real dislocation of the chimney under the influence of the horizontal forces - wind). The positive stress pattern in the concrete as well as the negative stress pattern in the reinforcing steel have been presented. The two cases were compared. Analysis of the stress changes in the chimney mantle depending on the modification in the thickness of the mantle (the thickness of the chimney mantle was altered in the linear or the abrupt way) was carried out. The relation between the stresses and the chimney's diameter change from the bottom to the top of the chimney was investigated. All the analyses were conducted by means of a specially developed computer program created in Mathematica environment. The program makes it also possible to control calculations and to visualize the results of the calculations at every stage of the calculation process.}, subject = {Architektur }, language = {en} } @inproceedings{WolkowiczRuthStahr, author = {Wolkowicz, Christian and Ruth, J{\"u}rgen and Stahr, Alexander}, title = {TOOL TO CHECK TOPOLOGY AND GEOMETRY FOR SPATIAL STRUCTURES ON BASIS OF THE EXTENDED MAXWELL'S RULE}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3037}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30370}, pages = {8}, abstract = {One of the simplest principle in the design of light-weight structures is to avoid bending. This can be achieved by dissolving girders into members acting purely in axial tension or compression. The employment of cables for the tensioned members leads to even lighter structures which are called cable-strut structures. They constitute a subclass of spatial structures. To give fast information about the general feasibility of an architectural concept employing cable-strut structures is a challenging task due to their sophisticated mechanical behavior. In this regard it is essential to control if the structure is stable and if pre-stress can be applied. This paper presents a tool using the spreadsheet software Microsoft (MS) Excel which can give such information. Therefore it is not necessary to purchase special software and the according time consuming training is much lower. The tool was developed on basis of the extended Maxwell's rule, which besides topology also considers the geometry of the structure. For this the rank of the node equilibrium matrix is crucial. Significance and determination of the rank and the implementation of the corresponding algorithms in MS Excel are described in the following. The presented tool is able to support the structural designer in an early stage of the project in finding a feasible architectural concept for cable-strut structures. As examples for the application of the software tool two special cable-strut structures, so called tensegrity structures, were examined for their mechanical behavior.}, subject = {Architektur }, language = {en} } @inproceedings{WittwerBecker, author = {Wittwer, Christof and Becker, Rainer}, title = {MODELLBASIERTE ERTRAGSKONTROLLE F{\"U}R PV ANLAGEN IN VERNETZTEN GEB{\"A}UDEN}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3036}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30363}, pages = {5}, abstract = {Subject of the paper is the realisation of a model based efficiency control system for PV generators using a simulation model. A standard 2-diodes model of PV generator is base of the ColSim model, which is implemented in ANSI C code for flexible code exporting. The algorithm is based on discretisized U-I characteristics, which allows the calculation of string topologies witch parallel and serial PV cells and modules. Shadowing effects can be modelled down to cell configuration using polar horizon definitions. The simulation model was ported to a real time environment, to calculate the efficiency of a PV system. Embedded System technology allows the networked operation and the integration of standard I/O devices. Futher work focus on the adaption of shadowing routine, which will be adapted to get the environment conditions from the real operation.}, subject = {Architektur }, language = {de} } @inproceedings{Wittenberg, author = {Wittenberg, Reinhold}, title = {AUFBAU EINES MANAGEMENT-INFORMATIONS-SYSTEMS (M-I-S) UND BAUSTELLEN-CONTROLLINGS}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3035}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30356}, pages = {7}, abstract = {Die meisten Insolvenzen in Deutschland kommen aus der Bauindustrie. Die Gr{\"u}nde hierf{\"u}r sind vielschichtig, jedoch kann mittels eines modern ausgerichteten M-I-S und Baustellen-Controllings fr{\"u}hzeitig erkannt werden, wie sich die Baustellenergebnisse entwickeln. Hierzu ist es notwendig, dass die Arbeitskalkulation st{\"a}ndig auf dem Laufenden gehalten wird. Nur wenn dies geschieht, sind monatliche Soll-/ Ist-Vergleiche und eine Betrachtung der cost-to-complete m{\"o}glich und sinnvoll. Eine monatlich rollierende Prognose des Baustellenergebnisses zum Bauende erm{\"o}glicht, dass gravierende Ver{\"a}nderungen des Ergebnisses umgehend aufgedeckt werden. Nur in Kenntnis dieser Entwicklungen kann das Management fr{\"u}hzeitig (im Sinne eines Fr{\"u}hwarnsystems) agieren und Steuerungsmaßnahmen ergreifen. Die Ergebnisprognose zum Bauende ist allein als Steuerungsinstrument nicht ausreichend. Die Finanzsituation der Baustelle muß auch regelm{\"a}ßig gepr{\"u}ft werden, d.h. der Leistungsstand mit der Rechnungsstellung an den Bauherren abgeglichen sowie die unbezahlten Rechnungen des Bauherren {\"u}berpr{\"u}ft werden. Das beste Prognoseergebnis ist wertlos, wenn der Bauherr seine bezogenen Leistungen nicht verg{\"u}tet. Die wirtschaftlichen Daten stehen den Verantwortlichen online im Baustellen-Informations-System (B-I-S) zur Verf{\"u}gung. Ein Ampelsystem verdeutlicht die wirtschaftliche Lage der Baustelle.}, subject = {Architektur }, language = {de} } @inproceedings{WillenbacherHuebler2000, author = {Willenbacher, Heiko and H{\"u}bler, Reinhard}, title = {Relationen zwischen Dom{\"a}nenmodellen Ansatz zur Schaffung einer integrierenden computergest{\"u}tzten Bauplanungsumgebung}, doi = {10.25643/bauhaus-universitaet.617}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-6178}, year = {2000}, abstract = {Die zunehmend erforderliche Kooperation verschiedener Beteiligter unterschiedlicher Fachbereiche und der Einsatz hochspezialisierter Fachapplikationen in heterogenen Systemumgebungen unterstreichen die Bedeutung und Notwendigkeit neuer Konzepte und M{\"o}glichkeiten zur Schaffung einer computergest{\"u}tzten Integrationsebene. Ziel einer computergest{\"u}tzten Integrationsebene ist die Verbesserung der Kooperation und Kommunikation unter den Beteiligten. Grundlage daf{\"u}r ist die Etablierung eines effizienten und fehlerfreien Daten- und Informationsaustausches zwischen den verschiedenen Fachplanern und -applikationen. Die Basis f{\"u}r die Datenintegrationsebene bildet ein digitales Bauwerksmodell im Sinne eines >virtuellen Bauwerks<, welches alle relevanten Daten und Informationen {\"u}ber ein zu planendes oder real existierendes Bauwerk zur Verf{\"u}gung stellt. Bei der Verwirklichung einer Bauwerksmodell-orientierten Datenintegrationsebene und deren Modellverwaltung erweist sich speziell die Definition des Bauwerksmodells also die Spezifikation der relevanten auszutauschenden Daten als {\"a}ußerst komplex. Der hier vorzustellende Relationen-orientierte Ansatz, d.h. die Realisierung des Daten- und Informationsaustauschs mittels definierter Relationen und Beziehungen zwischen dynamisch modifizierbaren Dom{\"a}nenmodellen, bietet Ans{\"a}tze zur: * Verringerung und Beherrschung der Komplexit{\"a}t des Bauwerksmodells (Teilmodellbildung) * Realisierung eines effizienten Datenaustauschs (Relationenmanagement) Somit stellt der Relationenorientierte Ansatz einen ad{\"a}quaten L{\"o}sungsweg zur Modellierung eines digitalen Bauwerksmodells als Datenintegrationsebene f{\"u}r den Lebenszyklus eines Bauwerkes dar.}, subject = {Bauwesen}, language = {de} } @article{WernerEshete1997, author = {Werner, F. and Eshete, T.}, title = {Grundlagen zur Methodik der Verschneidung stahlbautypischer K{\"o}rper in einem CAD-System}, doi = {10.25643/bauhaus-universitaet.460}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4601}, year = {1997}, abstract = {Der Effekt des praktischen Einsatzes von CAD-Systemen im Stahlbau ersch{\"o}pft sich heute weitgehend in einer Verbesserung der Qualit{\"a}t der Planungsunterlagen und in der Verk{\"u}rzung der Bearbeitungszeiten. Dabei ist bei schwierigen individuellen Konstruktionen die Einsparung an Arbeitszeit oft nicht sehr markant gegen{\"u}ber einer traditionellen Arbeitsweise. Die dreidimensionale Erfassung, Speicherung und Verarbeitung von Konstruktionsdaten im Rechner verlangt neben gr{\"o}ßeren Rechenleistungen neue Verfahren f{\"u}r die Behandlung dieser Daten. Die M{\"o}glichkeiten der Automatisierung stahlbautypischer Produktionsvorg{\"a}nge und einer variablen, computergest{\"u}tzten Planung erfordern wissenschaftlich-technische Betrachtungen des Gesamtproblems. Ausgehend von den Anforderungen des Stahlbaus wird ein neues dreidimensionales Volumenmodell f{\"u}r den rechnergest{\"u}tzten Entwurf und die Konstruktion erarbeitet. Es werden grundlegende Methoden zur Problembehandlung aufgezeigt. Die Methodik basiert im wesentlichen auf der Methode der Inzidenz-Matrizen, um die Beziehungen zwischen topologischen und geometrischen Informationen eines K{\"o}rpers darzustellen. Die Ermittlung der lokalen Mannigfaltigkeiten wird mit dem Euler-Polyedersatz verglichen und an Beispielen demonstriert. Eine neue Methode zur Ermittlung der lokalen Mannigfaltigkeiten wird dargestellt. Stahlbauspezifische Konstruktionen werden erzeugt und ihre Gestalt nach Anforderungen ver{\"a}ndert. Im besonderen werden stahlbauspezifische Ausklinkungen und Verschneidungen erarbeitet und an Beispielen pr{\"a}sentiert.}, subject = {Stahlbau}, language = {de} } @inproceedings{WenderWillenbacherHuebler, author = {Wender, K. and Willenbacher, Heiko and H{\"u}bler, Reinhard}, title = {BENUTZERAD{\"A}QUATE NAVIGATIONS- UND RECHERCHETECHNOLOGIEN F{\"U}R VERTEILTE DYNAMISCHE DIGITALE BAUWERKSMODELLE}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3034}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30349}, pages = {13}, abstract = {Hinsichtlich der Integration einzelner Bauwerkslebensphasen und der verschiedenen Beteiligten, insbesondere innerhalb von Bauplanungs- und Revitalisierungsprozessen, bestehen aktuell entscheidende Defizite. Die generelle Zielstellung der in diesem Beitrag vorgestellten Forschungsarbeiten besteht in der Unterst{\"u}tzung und Verbesserung der Integration durch die disziplin- und lebensphasen{\"u}bergreifende Bereitstellung s{\"a}mtlicher bauwerksbezogener Informationen. Dies erfordert einerseits geeignete Ans{\"a}tze zur Modellierung und Integration der vielf{\"a}ltigen disziplinspezifischen Daten, andererseits geeignete L{\"o}sungen, die einen globalen Zugriff, Navigation und Recherche im Gesamtdatenbestand erm{\"o}glichen. Die Modellierung und Verwaltung bauwerksbezogener Daten ist seit l{\"a}ngerem Gegenstand diverser Forschungsarbeiten. Im Rahmen des SFB 524 wurde ein eigener Ansatz basierend auf einem laufzeitdynamischen Partialmodellverbund entwickelt. Dieser wird in den wesentlichen Grundz{\"u}gen anderen Ans{\"a}tzen gegen{\"u}bergestellt. Den Schwerpunkt dieses Beitrags bildet jedoch die Entwicklung einer geeigneten flexiblen Navigations- und Rechercheschicht zu Realisierung projektglobaler Informationsrecherche. Aus der Sicht der Modellierung und Datenverwaltung wie auch aus der Sicht der Informationsrecherche und Informationspr{\"a}sentation in Planungsprozessen ergeben sich verschiedene Anforderungen an derartige Recherchewerkzeuge, wobei der wesentlichste Grundsatz maximale Flexibilit{\"a}t hinsichtlich verf{\"u}gbarer Darstellungstechniken und deren freie Kombination mit Techniken formaler Suchanfragen ist. Das entwickelte Systemkonzept basiert auf einem Framework, welches verschiedene Grundtypen von Recherchemodulen und deren Interaktionsprinzipien vorgibt. Einzelne Recherchemodule werden als Auspr{\"a}gungen dieser Modultypen realisiert und k{\"o}nnen je nach Bedarf laufzeitdynamisch in die Navigationsschicht integriert werden. Die technische Realisierung des Systems erfolgt im Umfeld vorhandener Prototypen aus vorangegangenen Forschungsaktivit{\"a}ten. Dieses technische Umfeld gibt verschiedene Rahmenbedingungen vor, welche im Vorfeld prototypischer Implementierungen verschiedene Adaptionen des generellen Systemkonzepts notwendig machen. Der vorliegende Beitrag stellt den aktuellen Entwicklungsstand der Systeml{\"o}sung aus konzeptioneller und technischer Sicht sowie erste prototypische Realisierungen von Recherchemodulen vor.}, subject = {Architektur }, language = {de} } @inproceedings{Weitzmann, author = {Weitzmann, R{\"u}diger}, title = {SIMPLIFIED CYCLE-BASED DESIGN OF EXTREMELY LOADED STRUCTURES}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3033}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30338}, pages = {14}, abstract = {The design of safety-critical structures, exposed to cyclic excitations demands for non-degrading or limited-degrading behavior during extreme events. Among others, the structural behavior is mainly determined by the amount of plastic cycles, completed during the excitation. Existing simplified methods often ignore this dependency, or assume/request sufficient cyclic capacity. The paper introduces a new performance based design method that considers explicitly a predefined number of re-plastifications. Hereby approaches from the shakedown theory and signal processing methods are utilized. The paper introduces the theoretical background, explains the steps of the design procedure and demonstrates the applicability with help of an example. This project was supported by German Science Foundation (Deutsche Forschungsgemeinschaft, DFG)}, subject = {Architektur }, language = {en} } @article{WehnerSteinmannHuebler1997, author = {Wehner, R. and Steinmann, Frank and H{\"u}bler, Reinhard}, title = {FLEXOB - Entwicklungstool f{\"u}r dynamische, modellbasierte CAD-Systeme}, doi = {10.25643/bauhaus-universitaet.457}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4571}, year = {1997}, abstract = {Objektorientierte Modellierungstechniken werden gegenw{\"a}rtig vor allem Entwicklern von CAD-Systemen angeboten. Sie erzeugen {\"u}ber die Schritte OO-Modellanalyse und OO-Softwaredesign OO-Programme, die mit ihrer Compilation das durch den Softwareingenieur gefundene Modell festschreiben. Generell, aber insbesondere im Bauwerksdesign, ist dieses Vorgehen unbefriedigend, da hier eine Normung von Modellen nicht gelingt, der Entwurfsprozeß vergleichsweise lang ist und eine Kooperation von Ingenieurgewerken mit verschiedenen Modelldom{\"a}nen die Regel sind. Dar{\"u}ber hinaus weisen die Modelle in fr{\"u}hen Phasen ein hohes Maß an Unsch{\"a}rfe und Abstraktion auf. CAD-Tools, die diese Phasen unterst{\"u}tzen, ben{\"o}tigen deshalb: statt eines genormten Produktmodells ein einheitliches, kognitiv begr{\"u}ndetes Modellstrukturierungsparadigma, f{\"u}r das mit der Objektorientierung eine m{\"o}gliche Auspr{\"a}gung gegeben ist, ein explizites, verf{\"u}gbares Dom{\"a}nenmodell zur fortw{\"a}hrenden Interpretation von Bauwerksmodellen, deskriptive Elemente, die die Interpretation von Objekten und Attributen erleichtern, ein Konzept zur Behandlung von Unsch{\"a}rfe und Abstraktion. Hieraus ergeben sich f{\"u}r die Entwicklung von CAD-Systemen folgende Forderungen : Explizite Verf{\"u}gbarkeit von Klassenobjekten und deren Erzeugung und Ver{\"a}nderung zur Laufzeit, Vererbung auf Klassen- und Instanzniveau, Erweiterte Attributkonzepte (Facetten), Unterst{\"u}tzung der Aggregation als einer wesentlichen Modellstrukturierungsrelation, Verf{\"u}gbarkeit von OO-Schnittstellen zum Aufbau von CAD-Systemen aus Tools einerseits, sowie zur Trennung von Modellverwaltung und Modellrepr{\"a}sentation andererseits. Als ein herausragendes Merkmal des Objektorientierten Paradigmas wird die Anwendungsn{\"a}he genannt, da Erscheinungen der behandelten Dom{\"a}ne sich analog in Modellen und Programmen wiederfinden (sollen). Unter der Grundannahme, daß dieses Paradigma auch durch den Anwender zur Erstellung seiner Modellwelten verwendet wird, will FLEXOB eine homogene Umgebung schaffen, die die Modellwelt des Softwareingenieurs zu Analysezwecken dem Anwender zur Verf{\"u}gung stellt und die die Erweiterung dieser Modellwelt auf deskriptivem Niveau erm{\"o}glicht. Das Tool FLEXOB und einige wesentliche Implementationsdetails werden im Beitrag vorgestellt. Es handelt sich bei diesem Tools um eine C++ Klassenbibliothek, die entweder als Objektmodul oder als Windows-DLL verwendet werden kann. Aspekte des Nutzungsregimes solch flexibler Modellverwaltungen werden im Beitrag ebenfalls angespochen.}, subject = {CAD}, language = {de} } @inproceedings{WallFoersterNeumannetal., author = {Wall, Wolfgang A. and F{\"o}rster, Christiane and Neumann, Malte and Ramm, Ekkehard}, title = {ADVANCES IN FLUID-STRUCTURE INTERACTION}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.2916}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-29161}, pages = {17}, abstract = {For the dynamic behavior of lightweight structures like thin shells and membranes exposed to fluid flow the interaction between the two fields is often essential. Computational fluid-structure interaction provides a tool to predict this interaction and complement or eventually replace expensive experiments. Partitioned analyses techniques enjoy great popularity for the numerical simulation of these interactions. This is due to their computational superiority over simultaneous, i.e. fully coupled monolithic approaches, as they allow the independent use of suitable discretization methods and modular analysis software. We use, for the fluid, GLS stabilized finite elements on a moving domain based on the incompressible instationary Navier-Stokes equations, where the formulation guarantees geometric conservation on the deforming domain. The structure is discretized by nonlinear, three-dimensional shell elements. Commonly used sequential staggered coupling schemes may exhibit instabilities due to the so-called artificial added mass effect. As best remedy to this problem subiterations should be invoked to guarantee kinematic and dynamic continuity across the fluid-structure interface. Since iterative coupling algorithms are computationally very costly, their convergence rate is very decisive for their usability. To ensure and accelerate the convergence of this iteration the updates of the interface position are relaxed. The time dependent, 'optimal' relaxation parameter is determined automatically without any user-input via exploiting a gradient method or applying an Aitken iteration scheme.}, subject = {Architektur }, language = {en} } @inproceedings{VossCoulonGebhardt1997, author = {Voß, A. and Coulon, Carl-Helmut and Gebhardt, F.}, title = {KI-Methoden beim Entwurf komplexer Geb{\"a}ude}, doi = {10.25643/bauhaus-universitaet.420}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20111215-4207}, year = {1997}, abstract = {Anhand von Ergebnissen aus dem FABEL-Projekt wird gezeigt, welche Beitr{\"a}ge Methoden der K{\"u}nstlichen Intelligenz, insbesondere der Wissensverarbeitung beim Entwurf komplexer Geb{\"a}ude leisten k{\"o}nnen. Exemplarisch werden spezialisierte wissensintensive Methoden, und allgemeine fallbasierte Methoden zum Retrieval und zur Wiederverwendung fr{\"u}herer Entw{\"u}rfe vorgestellt. Es werden Fragen der Integration von Wissen, F{\"a}llen und Daten diskutiert. Der Prototyp des FABEL-Projekts verwendet die Metapher der virtuellen Baustelle, um die verschiedenen Methoden als Planungswerkzeuge in einem CAD-System integriert anzubieten. Ein Planungsmodell dient der zus{\"a}tzlichen Orientierung des Planers. Die Ergebnisse sind interessant f{\"u}r den Entwurf komplexer Unikate, d{\"u}rften aber auch als Zusatz zu elektronisch angebotenen Katalogen relevant sein.}, subject = {Bauentwurf}, language = {de} } @inproceedings{Volkova, author = {Volkova, Viktorija}, title = {APPLICTION OF THE PHASE TRAJECTORIES MAPPING TO IDENTIFICATION}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3032}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30329}, pages = {7}, abstract = {The reduction of oscillation amplitudes of structural elements is necessary not only for maintenance of their durability and longevity but also for elimination of a harmful effect of oscillations on people and technology operations. The dampers are widely applied for this purpose. One of the most widespread models of structural friction forces having piecewise linear relation to displacement was analysed. T The author suggests the application of phase trajectories mapping in plane "acceleration - displacement". Unlike the trajectories mapping in a plane "velocity - displacement", they don't require large number of geometrical constructions for identification of the characteristics of dynamic systems. It promotes improving the accuracy. The analytical assumptions had been verified by numerical modeling. The results show good enough coincide between numerical and analytical estimation of dissipative characteristic.}, subject = {Architektur }, language = {en} } @inproceedings{UngerKoenke, author = {Unger, J{\"o}rg F. and K{\"o}nke, Carsten}, title = {DISCRETE CRACK SIMULATION OF CONCRETE USING THE EXTENDED FINITE ELEMENTMETHOD}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3030}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30303}, pages = {12}, abstract = {The extended finite element method (XFEM) offers an elegant tool to model material discontinuities and cracks within a regular mesh, so that the element edges do not necessarily coincide with the discontinuities. This allows the modeling of propagating cracks without the requirement to adapt the mesh incrementally. Using a regular mesh offers the advantage, that simple refinement strategies based on the quadtree data structure can be used to refine the mesh in regions, that require a high mesh density. An additional benefit of the XFEM is, that the transmission of cohesive forces through a crack can be modeled in a straightforward way without introducing additional interface elements. Finally different criteria for the determination of the crack propagation angle are investigated and applied to numerical tests of cracked concrete specimens, which are compared with experimental results.}, subject = {Architektur }, language = {en} } @inproceedings{Ubysz, author = {Ubysz, Andrzej}, title = {MATHEMATICAL DESCRIPTION OF SELF-EXCITED VIBRATIONS IN SILO WALLS}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3029}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30294}, pages = {7}, abstract = {The paper contains a description of dynamic effects in the silo wall during the outflow of a stored material. The work allows for determining the danger of construction damage due to resonant vibrations and is of practical importance by determining the influence of cyclic pressures and vibro-creeping during prolonged use of a silo. The paper was devised as a result of tests on silo walls in semi-technical scale. The model is generally applicable and allows for identification of parameters in real- size silos as well.}, subject = {Architektur }, language = {en} } @inproceedings{TrummerDenzlerSuesse, author = {Trummer, Michael and Denzler, J. and S{\"u}ße, Herbert}, title = {PRECISE 3D MEASUREMENT WITH STANDARD MEANS AND MINIMIAL USER INTERACTION - EXTENDED SINGLE-VIEW RECONSTRUCTION}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3028}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30282}, pages = {8}, abstract = {The paper proposes a new method for general 3D measurement and 3D point reconstruction. Looking at its features, the method explicitly aims at practical applications. These features especially cover low technical expenses and minimal user interaction, a clear problem separation into steps that are solved by simple mathematical methods (direct, stable and optimal with respect to least error squares), and scalability. The method expects the internal and radial distortion parameters of the used camera(s) as inputs, and a plane quadrangle with known geometry within the scene. At first, for each single picture the 3D position of the reference quadrangle (with respect to each camera coordinate frame) is calculated. These 3D reconstructions of the reference quadrangle are then used to yield the relative external parameters of each camera regarding the first one. With known external parameters, triangulation is finally possible. The differences from other known procedures are outlined, paying attention to the stable mathematical methods (no usage of nonlinear optimization) and the low user interaction with good results at the same time.}, subject = {Architektur }, language = {en} } @inproceedings{Traversoni, author = {Traversoni, Leonardo}, title = {MOVEMENT DETECTION AND RECOGNITION WITH QUATERNION WAVELETS}, editor = {G{\"u}rlebeck, Klaus and K{\"o}nke, Carsten}, organization = {Bauhaus-Universit{\"a}t Weimar}, doi = {10.25643/bauhaus-universitaet.3027}, url = {http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20170327-30274}, pages = {8}, abstract = {We show how a Morlet type quaternion wavelet may be tuned to a pair of stereoscopic {\O}lms in order to detect moving objects and calculate its velocity shape volume and other characteristics. We show some practical examples of simple objects taken with normal pocket avi cameras.}, subject = {Architektur }, language = {en} }