B. Moulin, V. Feldgun, M. Karpel, L. Anguita, F. Rosich, H. Climent

Control laws for the alleviation of dynamic gust loads on a wind-tunnel model of a transport aircraft using wing-mounted control surfaces are evaluated. Three different wing-mounted control surfaces are considered: symmetrically-actuated ailerons, underwing forward-positioned control surfaces at about 0.8 of the wing span, and wing-tip forward-positioned control surfaces. The 5.3-meter-span cable-mounted wind-tunnel model was constructed at the TsAGI laboratories and tested there as part of the 3AS 5th- Framework European Commission research project. The length of a one-minus-cosign vertical gust velocity profile is tuned to yield maximal wing-root bending moment. All the control laws are based on simple low-pass filters for easy and robust application in the wind tunnel. Each is based on single input of a wing-tip accelerometer which is shown to react in time to allow the alleviation of the peak of the wing-root bending moment. All the three control means are shown to alleviate the extreme wing-root moments by 9-16% and the wing-tip accelerations by 26-33% at intermediate design flight velocities. The effects on section-loads envelopes at monitoring stations along the wing are also very favorable. The wing-tip and under-wing controls are found to be more effective than the existing aileron at these speeds. The ailerons become even less effective at higher speeds due to reduction in their aeroelastic effectiveness. They are also shown to be most problematic in creating aeroservoelastic instability when the gust-alleviation loop is closed. The effects of the designed control laws on the statistical response of the wing loads to continuous gusts are shown to be similar to their effects on discrete gusts.

International Forum on Aeroelasticity and Structural Dynamics, 2005, München

Conference Paper

englisch

21,0 x 29,7 cm, 18 Seiten

DGLR-Bericht, 2005, 2005-04, International Forum on Aeroelasticity and Structural Dynamics 2005; S.1-18; 2005; Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V., Bonn

NA

in getr. Zählung;

aeroelasticity, dynamic loads, gusts, loads (forces)

Bibliothek

2005