Refine
Year of publication
- 2004 (37) (remove)
Document Type
- Conference Proceeding (37) (remove)
Keywords
- Bauingenieurwesen (3)
- CAD (3)
- civil engineering (3)
- Elektromagnetischer Schutzschild (2)
- Arbeitsbelastung (1)
- Audio-visual Art (1)
- Bewertung von Studienleistungen . Studierendenmobilität (1)
- Blitz (1)
- Blitzrisiko (1)
- Blitzschlag (1)
- Blitzschutz (1)
- Bologna-Prozess (1)
- Direct lightning strike (1)
- Direkter Blitzschlag (1)
- ECTS (1)
- Elektronische Kunst (1)
- European Credit Transfer System (1)
- Europäisches Leistungspunktesystem (1)
- Fibroblast (1)
- Hybrid Art (1)
- Hybride Kunst (1)
- Induzierte Spannungen (1)
- Kalkulation (1)
- Karosseriebau (1)
- Karosserieleichtbau (1)
- Klangkunst (1)
- Leichtbau (1)
- Leichtbauwerkstoffe (1)
- Lightning (1)
- Lightning Protection (1)
- Lightning Risk (1)
- Magnetische Felder (1)
- Materialmischbauweise (1)
- Maßstabsgetreues Modell (1)
- Mechanische Beanspruchung (1)
- Medienkunst (1)
- Risiko (1)
- Risikoabwägung (1)
- Risk (1)
- Risk Assessment (1)
- Risk Management (1)
- Sound Art (1)
- Stahlbeton (1)
- UML (1)
- Unified Modeling Language (1)
- Workload (1)
- calculations (1)
- celldrum technology (1)
- electromagnetic shield (1)
- electromagnetic shielding (1)
- induced voltages (1)
- magnetic fields (1)
- reinforced concrete (1)
- scaled model (1)
Institute
- Fachbereich Energietechnik (10)
- Solar-Institut Jülich (7)
- Fachbereich Maschinenbau und Mechatronik (5)
- Fachbereich Medizintechnik und Technomathematik (5)
- Fachbereich Elektrotechnik und Informationstechnik (3)
- Fachbereich Luft- und Raumfahrttechnik (3)
- IfB - Institut für Bioengineering (3)
- Fachbereich Bauingenieurwesen (2)
- Fachbereich Gestaltung (1)
- ZHQ - Bereich Hochschuldidaktik und Evaluation (1)
In the paper the results obtained from experiments at a modelled reinforced building in case of a direct lightning strike are compared with calculations. The comparison includes peak values of the magnetic field Hmax, its derivative (dH/dt)max and of induced voltages umax in typical cable routings. The experiments are performed at a 1:6 scaled building and the results are extrapolated using the similarity relations theory. The calculations are based on the approximate formulae given in IEC 62305-4 and have to be supplemented by a rough estimation of the additional shielding effect of a second reinforcement layer. The comparison shows, that the measured peak values of the magnetic field and its derivative are mostly lower than the calculated. The induced voltages are in good agreement. Hence, calculations of the induced voltages based on IEC 62305-4 are a good method for lightning protection studies of buildings, where the reinforcement is used as a grid-like electromagnetic shield.
For the application of the concept of Lightning Protection Zones (LPZ), the knowledge of the magnetic fields and induced voltages inside a structure is necessary. Laboratory experiments have been conducted at a downscaled model of a building (scale factor 1:6) to determine these electromagnetic quantities in case of a direct strike to the structure. The model (3 m x 2 m x 2 m) represented a small industrial building using the reinforcement of the concrete as electromagnetic shield. The magnetic fields and magnetic field derivatives were measured at several location inside the scaled model. Further, the voltages induced on three typical cable routes inside the model was determined. The influence of the lightning current waveshape, point-of-strike, bonding of the cable routes, and bridging of an expansion joint in the middle of the building on these quantities was studied.
1) In Karosseriestrukturen steht der richtige Werkstoffeinsatz stärker den je im Spannungsfeld von Leichtbau, Kosten (Stückzahlen) und Leistungsanforderung 2) In „klassischen“ Strukturen von Modulträgern und Klappen hat sich die Materialmischbauweise verstärkt in den letzten Jahren durchgesetzt 3) Unter Aspekten des konzeptionellen Leichtbaus erscheint der verstärkte Einsatz von Leichtbauwerkstoffen im Vorderwagen sowie in der Dachstruktur zielführend 4) Offene Strukturprofile in Materialmischbauweise liefern für eine Vielzahl von Anwendungen ein interessantes und bis dato kaum genutztes Potential 5) Neue Entwicklungen bei den Fügetechnologien (i.b. kontinuierliche Fügeverbindungen und kombinierte Verfahren) unterstützen den wirtschaftlichen Karosserieleichtbau 6) Werkstoffinnovationen sowie neuartige Fertigungsverfahren machen den Konstruktionswerkstoff „Stahl“ auch in der Zukunft im Karosseriebau weiterhin sehr attraktiv
Recently, in his vision for space exploration, US president Bush announced to extend human presence across the solar system, starting with a human return to the Moon as early as 2015 in preparation for human exploration of Mars and other destinations. In Europe, an exploration program, termed AURORA, was established by ESA in 2001 – funded on a voluntary basis by ESA member states – with a clear focus on Mars and the ultimate goal of landing humans on Mars around 2030 in international cooperation. In 2003, a Human Spaceflight Vision Group was appointed by ESA with the task to develop a vision for the role of human spaceflight during the next quarter of the century. The resulting vision focused on a European-led lunar exploration initiative as part of a multi-decade, international effort to strengthen European identity and economy. After a review of the situation in Europe concerning space exploration, the paper outlines an approach for a consistent positioning of exploration within the existing European space programs, identifies destinations, and develops corresponding scenarios for an integrated strategy, starting with robotic missions to the Moon, Mars, and near-Earth asteroids. The interests of the European planetary in-situ science community, which recently met at DLR Cologne, are considered. Potential robotic lunar missions comprise polar landings to search for frozen volatiles and a sample return. For Mars, the implementation of a modest robotic landing mission in 2009 to demonstrate the capability for landing and prepare more ambitious and complex missions is discussed. For near-Earth asteroid exploration, a low-cost in-situ technology demonstration mission could yield important results. All proposed scenarios offer excellent science and could therefore create synergies between ESA’s mandatory and optional programs in the area of planetary science and exploration. The paper intents to stimulate the European discussion on space exploration and reflects the personal view of the authors.
Solar sails enable missions to the outer solar system and beyond, although the solar
radiation pressure decreases with the square of solar distance. For such missions, the solar sail may gain a large amount of energy by first making one or more close approaches to the sun. Within this paper, optimal trajectories for solar sail missions to the outer planets and into near interstellar space (200 AU) are presented. Thereby, it is shown that even near/medium-term solar sails with relatively moderate performance allow reasonable transfer times to the boundaries of the solar system.