Dokument-ID Dokumenttyp Verfasser/Autoren Herausgeber Haupttitel Abstract Auflage Verlagsort Verlag Erscheinungsjahr Seitenzahl Schriftenreihe Titel Schriftenreihe Bandzahl ISBN Quelle der Hochschulschrift Konferenzname Quelle:Titel Quelle:Jahrgang Quelle:Heftnummer Quelle:Erste Seite Quelle:Letzte Seite URN DOI Abteilungen
OPUS4-3959 Masterarbeit / Diplomarbeit Kavrakov, Igor Structural Optimization of Composite Cross-Sections and Elements using Energy Methods Structural optimization has gained considerable attention in the design of structural engineering structures, especially in the preliminary phase. This study introduces an unconventional approach for structural optimization by utilizing the Energy method with Integral Material Behavior (EIM), based on the Lagrange's principle of minimum potential energy. An automated two-level optimization search process is proposed, which integrates the EIM, as an alternative method for nonlinear structural analysis, and the bilevel optimization. The proposed procedure secures the equilibrium through minimizing the potential energy on one level, and on a higher level, a design objective function. For this, the most robust strategy of bilevel optimization, the nested method is used. The function of the potential energy is investigated along with its instabilities for physical nonlinear analysis through principle examples, by which the advantages and limitations using this method are reviewed. Furthermore, optimization algorithms are discussed. A numerical fully functional code is developed for nonlinear cross section, element and 2D frame analysis, utilizing different finite elements and is verified against existing EIM programs. As a proof of concept, the method is applied on selected examples using this code on cross section and element level. For the former one a comparison is made with standard procedure, by employing the equilibrium equations within the constrains. The validation of the element level was proven by a theoretical solution of an arch bridge and finally, a truss bridge is optimized. Most of the principle examples are chosen to be adequate for the everyday engineering practice, to demonstrate the effectiveness of the proposed method. This study implies that with further development, this method could become just as competitive as the conventional structural optimization techniques using the Finite Element Method. 96 urn:nbn:de:gbv:wim2-20190815-39593 10.25643/bauhaus-universitaet.3959 Professur Modellierung und Simulation - Konstruktion
OPUS4-3815 Wissenschaftlicher Artikel Völker, Conrad; Mämpel, Silvio; Kornadt, Oliver Measuring the human body's micro-climate using a thermal manikin The human body is surrounded by a micro-climate which results from its convective release of heat. In this study, the air temperature and flow velocity of this micro-climate were measured in a climate chamber at various room temperatures, using a thermal manikin simulating the heat release of the human being. Different techniques (Particle Streak Tracking, thermography, anemometry, and thermistors) were used for measurement and visualization. The manikin surface temperature was adjusted to the particular indoor climate based on simulations with a thermoregulation model (UCBerkeley Thermal Comfort Model). We found that generally, the micro-climate is thinner at the lower part of the torso, but expands going up. At the head, there is a relatively thick thermal layer, which results in an ascending plume above the head. However, the micro-climate shape strongly depends not only on the body segment, but also on boundary conditions: the higher the temperature difference between the surface temperature of the manikin and the air temperature, the faster the air flow in the micro-climate. Finally, convective heat transfer coefficients strongly increase with falling room temperature, while radiative heat transfer coefficients decrease. The type of body segment strongly influences the convective heat transfer coefficient, while only minimally influencing the radiative heat transfer coefficient. 12 Indoor Air 24, 6 567 579 urn:nbn:de:gbv:wim2-20181025-38153 10.25643/bauhaus-universitaet.3815 Professur Bauphysik
OPUS4-3417 Konferenzveröffentlichung Schwedler, Michael; Könke, Carsten Integrierte Tragwerksanalysen mittels Bauwerksinformationsmodellen und isogeometrischer FE-Methoden Integrierte Tragwerksanalysen mittels Bauwerksinformationsmodellen und isogeometrischer FE-Methoden 978-3-00-041256-1 Institut für Strukturmechanik
OPUS4-3416 Konferenzveröffentlichung Hatahet, Tareq; Könke, Carsten Rational Framework for Probability of Collapse in Buildings Rational Framework for Probability of Collapse in Buildings Institut für Strukturmechanik
OPUS4-3348 Wissenschaftlicher Artikel Zhuang, Xiaoying; Huang, Runqiu; Rabczuk, Timon; Liang, C. A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage Mathematical Problems in Engineering Institut für Strukturmechanik
OPUS4-3346 Wissenschaftlicher Artikel Amiri, Fatemeh; Millán, D.; Shen, Y.; Rabczuk, Timon; Arroyo, M. Phase-field modeling of fracture in linear thin shells Phase-field modeling of fracture in linear thin shells 7 Theoretical and Applied Fracture Mechanics 102 109 Institut für Strukturmechanik
OPUS4-3345 Wissenschaftlicher Artikel Thai, Chien H.; Ferreira, A.J.M.; Bordas, Stéphane Pierre Alain; Rabczuk, Timon; Nguyen-Xuan, Hung Isogeometric analysis of laminated composite and sandwich plates using a new inverse trigonometric shear deformation theory Isogeometric analysis of laminated composite and sandwich plates using a new inverse trigonometric shear deformation theory 19 European Journal of Mechanics 89 108 Institut für Strukturmechanik
OPUS4-3344 Wissenschaftlicher Artikel Nanthakumar, S.S.; Lahmer, Tom; Rabczuk, Timon Detection of multiple flaws in piezoelectric structures using XFEM and level sets Detection of multiple flaws in piezoelectric structures using XFEM and level sets 14 Computer Methods in Applied Mechanics and Engineering 98 112 Institut für Strukturmechanik
OPUS4-3342 Wissenschaftlicher Artikel Chen, Lei; Nguyen-Thanh, Nhon; Nguyen-Xuan, Hung; Rabczuk, Timon; Bordas, Stéphane Pierre Alain; Limbert, Georges Explicit finite deformation analysis of isogeometric membranes Explicit finite deformation analysis of isogeometric membranes 26 Computer Methods in Applied Mechanics and Engineering 104 130 Institut für Strukturmechanik
OPUS4-3343 Wissenschaftlicher Artikel Vu-Bac, N.; Lahmer, Tom; Keitel, Holger; Zhao, Jun-Hua; Zhuang, Xiaoying; Rabczuk, Timon Stochastic predictions of bulk properties of amorphous polyethylene based on molecular dynamics simulations Stochastic predictions of bulk properties of amorphous polyethylene based on molecular dynamics simulations 14 Mechanics of Materials 70 84 Institut für Strukturmechanik