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Seminar by Bram Elsenaar |
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Date: March 14, 2005
Time: 10:30am
Location: NIA, Rm 404
Speaker: Bram Elsenaar, NLR, ret.
Subject: "Wake Turbulence: Do We Know Enough to Manage the Safety Aspects?"
Additional Information: Presentation (PDF)
Aircraft trailing vortices or wake turbulence create a safety problem. In the 70’s safe separation distances have been defined on the basis of physical reasoning and flight tests. These separation distances are generally accepted as safe. It can be argued that present ruling is too conservative for many conditions causing unnecessary restrictions on airport capacity. Both in Europe and the US research is ongoing to see if these rules can be modified, depending on specific airport and weather scenarios. It is far from obvious how the safety aspects due to rule change can be assessed. A rational way to do this is a probabilistic safety assessment based on a complete simulation of the various elements of wake turbulence and its consequences. These elements have been studied in various programs sponsored by the European Commission. The presentation will focus on aspects like wake generation and characterisation, wake transport and decay due to weather, wake vortex encounters and integration aspects into an ATM system. A significant progress has been made in the last years and it will finally be identified if and where knowledge is still missing.
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