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- tensile membrane structure, lightweight structure, parametric design, visual programming, interoperability, BIM, IFC, RF-COM, Grasshopper3D, Rhinoceros, Revit, Allplan (1)
- Висячие покрытия, Параметрическое проектирование, Визуальное программирование, Обмен данными, BIM, IFC, RF-COM, Grasshopper3D, Rhinoceros, Revit, Allplan (1)
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This paper presents the integration of a spline based extension model into a probability hypothesis density (PHD) filter for extended targets. Using this filter the position and extension of each object as well as the number of present objects can jointly be estimated. Therefore, the spline extension model and the PHD filter are addressed and merged in a Gaussian mixture (GM) implementation. Simulation results using artificial laser measurements are used to evaluate the performance of the presented filter. Finally, the results are illustrated and discussed.
Mechanical properties after stretching testings were calcu-lated and experimentally determined via Tempcore method for bar core, bar surface and whole bar cross section. It was displayed on the base of experiments and imitating simulation that deformation in core and surface areas of a bar are equal and therefore influence of structural parameters in the core area is principally decisive for initiating of neck forming in the surface area. The results showed that resistance to destruction of martensite surface layer has rather less effect on bar properties in general in comparison with previous investigations. It is concluded that improvement of core structure quality can help to lower brittleness of the whole bar. It was also proved that used techniques provide good concordance between the obtained results and experimental data. Therefore, the additivity rule for structural components can be used successfully for determination of whole bar parameters, taking into account thickness of surface layer that can be measured easily using hardness sensor. It will simplify practically quality control of products.
Jahresbericht 2019
(2019)
The Lake Constance region is due to its scenic attractiveness one of the most visited destinations in German-speaking countries. Scenic attractiveness as well as so-called landscape stereotypes also play a decisive role in tourism marketing. Tour operators reproduce supra-individual landscape concepts and establish mental geographies that ultimately influence the choice of destinations. A growing trend in tourism is the emergence of creative narratives in tourism marketing and tourism offers induced by creative companies. By means of a discourse-analytical investigation, whose theoretical and conceptual frame of reference is the hegemony and discourse theory of Laclau and Mouffe (1985), recurring landscape stereotypes are identified in tourist promotional material for the destination Bodensee. Based on these results as well as expert interviews with regional tourism stakeholders, a discussion of the creative economic potential for regional tourism marketing will take place. The investigation shows that these potentials are currently not being exhausted. At the same time, creative tourism can help a rural region, such as Lake Constance, to position itself as an alternative to city tourism, while at the same time addressing the lucrative target group 60plus.
设计城市
(2019)
BIM im Membranbau
(2019)
Die fortschreitende Digitalisierung wird zurzeit zu einem der wichtigsten Themen und zugleich zu einer der größten Herausforderungen für die Bauwirtschaft. Building Information Modeling (BIM) kommt eine immer größere Bedeutung zu.
Es ist sicherlich richtig, dass derzeit nur wenige Projekte im Bauwesen den geforderten BIM-Anforderungen der Bauherrschaft genügen. Es ist zu erwarten, dass in den kommenden Jahren auch an Membranbauprojekte immer mehr Anforderungen bezüglich BIM gestellt werden. Aus diesem Grund ist es wichtig, dass sich Planungsbüros für leichte Flächentragwerke mit dem Thema BIM befassen.
Ziel dieser Arbeit ist die Ausarbeitung eines Konzepts für die effiziente durchgehende Umsetzung der Building Information Modeling-Arbeitsmethode bei der Tragwerksplanung im Membranbau.
Es werden vorhandene Funktionalitäten untersucht und alternative Interoperabilitätskomponenten entwickelt. Aufbauend auf den möglichen Werkzeugketten werden verschiedene Einsatzverfahren vorgeschlagen. Darauffolgend wird eines der möglichen Verfahren an einem realen Tragwerk implementiert. Die erhaltenen Ergebnisse werden einer kritischen Analyse unterzogen.
Abschließende Rückschlüsse, Beurteilung der angewandten Planungsmethoden und Ausblick fassen das behandelte Thema zusammen.
Bei der Arbeit verwendete Methoden schließen den parametrischen Entwurf, manuelle Modellierung in zwei verschiedenen Softwareumgebungen und textliche Programmierung mit C#-Sprache ein.
Die Relevanz des untersuchten Themas erstreckt sich überwiegend auf praktisch tätige Ingenieure aus den Bereichen leichte Flächentragwerke, Sondertragwerke, Membranbau, wird aber auch für wissenschaftliche Mitarbeiter der Forschungsinstitutionen, BIM-Spezialisten und Produkthersteller von Interesse sein.
Das Potential der Offshore-Windenergie, welches hauptsächlich auf hohe mittlere Windgeschwindigkeiten zurückzuführen ist, kann nicht ignoriert werden. Trotzdem zeigt die Betrachtung der aktuell installierten Leistung und der Stromgestehungskosten, dass zusätzliche Risiko- und Kostenfaktoren existieren. Diese sind vor allem auf die Installation, die Energiewandlersysteme und die Netzanbindung zurückzuführen. Getriebeschäden sind einer dieser großen Kostenfaktoren. Aus diesem Grund gewinnen getriebelosen Windkraftanlagen mit permanentmagneterregten Synchrongeneratoren immer mehr an Relevanz. In der Netzanbindung von ganzen Offshore-Windparks überwiegt die Hochspannungs-Gleichstrom-Übertragung (HGÜ) ab einer Übertragungsdistanz von 80 km. Diese Tendenz ist sinkend. Steigende windparkinterne Spannungen auf 66 kV fördern zusätzlich den Verzicht auf Umspannplattformen, welche für die HGÜ-Technik aktuell sinnvoll sind. Diese und weitere bereits in Aussicht stehenden Entwicklungen führen zu einer Einschränkung der Risiko- und Kostenfaktoren. Es wird demnach davon ausgegangen, dass die Offshore-Windenergie, als Ergänzung zur Onshore-Windenergie, eine wichtige Rolle im Rahmen der Energiewende einnimmt.
Low temperature carburizing of a series of austenitic stainless with various combinations of chromium and nickel equivalents was performed. The investigation of the response towards low temperature carburized for three stainless steels with various Cr- and Ni-equivalents showed that the carbon uptake depends significantly on the chemical composition of the base material. The higher carbon content in the expanded austenite layer of specimen 6 (1.4565) and specimen 4 (1.4539/AISI 904L) compared to specimen 2 (1.4404/AISI 316L) is assumed to be mainly related to the difference in the specimens’ chromium content. More chromium leads to more lattice expansion. Along with the higher carbon content, higher hardness values and higher compressive residual stresses in the expanded austenite zone are introduced than for low temperature carburized AISI 316L. The residual stresses obtained from X-ray diffraction lattice strain investigation depend strongly on the chosen X-ray elastic constants. Presently, no values are known for carbon (or nitrogen) stabilized expanded austenite. Nevertheless, first principle elastic constants for γ′&minus Fe4C appear to provide realistic residual stress values. Magnetic force microscopy and measurement with an eddy current probe indicate that austenitic stainless steels can become ferromagnetic upon carburizing, similar for low temperature nitriding. The apparent transition from para- to ferromagnetism cannot be attributed entirely to the interstitially dissolved carbon content in the formed expanded austenite layer but appears to depend also on the metallic composition of the alloy, in particular the Ni content.