Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigation of shock waves in explosive blasts using fibre optic pressure sensors
To design buildings and structures mitigating the effects of explosive blasts, need are accurate models of the pressure-time-lapse, to calculate the transient forces on the structures. Modelling the behaviour of blast waves propagating into a region including obstructions remains one of the most challenging problems. For example, there are still uncertainties in realistic modelling of the real gas effects, especially in the vicinity of an explosion. Numerical modelling of blast waves is quite advanced, but accurate tracking of shocks across tens and hundreds of metres, which are typical distances for the scale relevant to a civil engineer, requires high computational costs. Pressure (side-on or reflected) is a very useful parameter of the blast wave; however, it is very difficult to measure accurately and need a high bandwidth resolution is required to measure the impulse force. The authors described miniature all-optical pressure sensors, fabricated by wafer etching techniques, less than 1 mm exp2 in overall cross-section with rise times in the micro-s regime and pressure ranges typically 900 kPa (9 bar). Their performance is suitable for experimental studies of the pressure-time history for test models exposed to shocks initiated by an explosive charge. The small size and fast response of the sensors promises higher quality data than has been previously available from conventional electrical sensors, with potential improvements to numerical models of blast effects. Results from blast tests are presented in which up to six sensors were multiplexed, embedded within test models in a range of orientations relative to the shock front.
Investigation of shock waves in explosive blasts using fibre optic pressure sensors
To design buildings and structures mitigating the effects of explosive blasts, need are accurate models of the pressure-time-lapse, to calculate the transient forces on the structures. Modelling the behaviour of blast waves propagating into a region including obstructions remains one of the most challenging problems. For example, there are still uncertainties in realistic modelling of the real gas effects, especially in the vicinity of an explosion. Numerical modelling of blast waves is quite advanced, but accurate tracking of shocks across tens and hundreds of metres, which are typical distances for the scale relevant to a civil engineer, requires high computational costs. Pressure (side-on or reflected) is a very useful parameter of the blast wave; however, it is very difficult to measure accurately and need a high bandwidth resolution is required to measure the impulse force. The authors described miniature all-optical pressure sensors, fabricated by wafer etching techniques, less than 1 mm exp2 in overall cross-section with rise times in the micro-s regime and pressure ranges typically 900 kPa (9 bar). Their performance is suitable for experimental studies of the pressure-time history for test models exposed to shocks initiated by an explosive charge. The small size and fast response of the sensors promises higher quality data than has been previously available from conventional electrical sensors, with potential improvements to numerical models of blast effects. Results from blast tests are presented in which up to six sensors were multiplexed, embedded within test models in a range of orientations relative to the shock front.
Investigation of shock waves in explosive blasts using fibre optic pressure sensors
Watson, S. (Autor:in) / MacPherson, W.N. (Autor:in) / Barton, J.S. (Autor:in) / Jones, J.D.C. (Autor:in) / Tyas, A. (Autor:in) / Pichugin, A.V. (Autor:in) / Hindle, A. (Autor:in) / Parkes, W. (Autor:in) / Dunare, C. (Autor:in) / Stevenson, T. (Autor:in)
2006
6 Seiten, 12 Bilder, 15 Quellen
Aufsatz (Konferenz)
Englisch
Anstiegszeit , Ätzverfahren , Bauingenieurwesen , Baustatik , Bauwerk , Detonationswelle , Druckerhöhung , Druckmessumformer , Explosion , Fabry-Perot-Resonator , Gebäude , Membran , optische Datenübertragung , Schockwellenversuch , Siliciumdioxid , Silicium-Wafer , Stoßbeanspruchung , Stoßwelle , Wafer (Halbleiterplättchen) , Modellsimulation , Simulationsmodell
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