Patent ID: 8024079
Filing Date: 2011-09-20
Classification: B64C,Y02T

Abstract:
1. A computer implemented method for symmetric and anti-symmetric control of aircraft flight control surfaces to reduce wing-body loads, the computer implemented method comprising: sending commands to symmetrically deploy outboard control surfaces to shift wing air-loads inboard based on airplane state and speed brake deployment of an aircraft; limiting surface rate retraction on a wing with peak loads to reduce maximum loads due to wheel checkback accompanied by utilization of opposite wing control surfaces to retain roll characteristics, wherein the wing-body loads are reduced using the symmetric and anti-symmetric control of the aircraft flight control surfaces; limiting a pilot commanded rate of gravity change for commanded normal acceleration and aircraft rate of gravity change response to acceptable magnitudes such that aircraft actuation systems and signal processing deploys wing-body load alleviation control surfaces in accordance with prescribed schedules; responsive to initiation of a positive gravity maneuver, shifting airloads inboard on a swept wing to move a center of pressure forward, wherein the tail load required to perform the positive gravity maneuver is reduced; responsive to initiation of a negative gravity maneuver, retracting speed brakes to reduce the positive tail load and aft body design loads during the negative gravity maneuver; and filtering out high gain feedback commands from wing structural modes above one hertz by a set of linear and non-linear filters.