The effects of active controls on the suppression of flutter and gust alleviation of two different types of subsonic aircraft (The Arava, twin turboprop STOL transport and the Westwind twin-jet business transport) are in¬vestigated. The active controls are introduced in pairs which include, in any chosen wing strip, a leading-edge (L.E.) control and a trailing-edge (T.E.) control. Each control surface is allowed to be driven by a combined linear-rotational sensor system, located on the activated strip. The control law, which translates the sensor signals into control surface rotations, is based on the concept of aerodynamic energy. All but one of the control-law parameters have been pre-optimized using two dimensional aerodynamic theory. The pre-optimized coefficients insure the effectiveness of each of the L.E. - T.E. systems in controlling any type of disturbance. The best locations of a single active system, are determined for the purpose of flutter suppression and for the purpose of gust alleviation (which includes alleviation of the maximum bending moment of the wing and alleviation of the accelerations along the fuselage, including the e.g. of the aircraft). Optimum locations for multi-sets of active controls are also determined.
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