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Alleviation of Atmospheric Flow Disturbance Effects on Aircraft Response

Hahn, Klaus-Uwe and Schwarz, Carsten Walter (2008) Alleviation of Atmospheric Flow Disturbance Effects on Aircraft Response. In: ICAS 2008 Proceedings. Optimage Ltd., Edingburgh, UK and ICAS. 26. Congress of International Council of Aeronautical Sciences (ICAS), 2008-09-14 - 2008-09-19, Anchorage, Alaska, USA. ISBN 0-9533991-9-2.

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Abstract

Since the air is the element of flying, air motion is an essential parameter in aeronautics. This paper gives an overview of the results of offline simulations, full flight simulator studies and results from in-flight simulation experiments to investigate the alleviation of atmospheric flow disturbance effects on aircraft response. The studies are part of the DLR project “Weather and Flying” aiming at the improvement of flight operation and safety in adverse weather conditions. Gusts and turbulence strongly affect the passenger comfort and the safety of aircraft. Another important air mass motion adversely affecting aircraft operation is wake vortex. This well known hazardous flow field is produced by aircraft themselves. Active control technology can be applied to alleviate these flow disturbance effects on aircraft motion in case of an encounter. DLR is developing the Integrated Ride and Loads Improvement System (IRLIS) to cope with the phenomena mentioned above. It can be shown that the aircraft response encountering natural and aircraftinduced (wake vortex) turbulence can be improved significantly by a feed-forward controller. Based on a forward-looking sensor, the controller generates aerodynamic surface deflections to counter the vertical accelerations generated by gusts as well as the roll response induced by lift variations along the wing span. For this investigation it is assumed that a LIDAR sensor is able to provide the necessary flow field information ahead of the a/c. In addition to the standard control surfaces (elevator, aileron and rudder) the a/c is supposed to be equipped with special flaps for independent direct lift control. Simulation results show a clear tendency that IRLIS can significantly improve the situation in adverse atmospheric flow fields.

Document Type:Conference or Workshop Item (Paper)
Title:Alleviation of Atmospheric Flow Disturbance Effects on Aircraft Response
Authors:
AuthorsInstitution or Email of Authors
Hahn, Klaus-UweUNSPECIFIED
Schwarz, Carsten WalterUNSPECIFIED
Date:September 2008
Journal or Publication Title:ICAS 2008 Proceedings
Editors:
EditorsEmail
Grant, Professor I.UNSPECIFIED
Publisher:Optimage Ltd., Edingburgh, UK and ICAS
ISBN:0-9533991-9-2
Status:Published
Keywords:Wake Vortex, Gusts, Aircraft Response, Disturbance Measurement, Control
Event Title:26. Congress of International Council of Aeronautical Sciences (ICAS)
Event Location:Anchorage, Alaska, USA
Event Type:international Conference
Event Dates:2008-09-14 - 2008-09-19
Organizer:International Council of Aeronautical Sciences (ICAS)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Wake Vortices (old)
Location: Braunschweig
Institutes and Institutions:Institute of Flight Systems > Flight Dynamics and Simulation
Deposited By: Carsten Walter Schwarz
Deposited On:03 Apr 2009
Last Modified:22 Oct 2009 14:33

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