Aircraft modal suppression system
AssigneeThe Boeing Company
InventorsAbhijit J. M. Chakravarty, Steven R. Cooper, John K. H. Ho, Chuong B. Tran
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Abstract
Accelerations due to excitation of the natural modes of an aircraft's body are suppressed by an active suppression system. Dedicated accelerometers are positioned in the aircraft at optimal locations for sensing modal induced lateral accelerations. The accelerometer produced signals are processed through control logic which, in response thereto, and in response to aircraft velocity and altitude related signals produces output control signals. The control signals effect rudder deployment creating forces to suppress the natural mode induced accelerations.
Claims19
An aircraft modal suppression control system for suppressing aircraft body deflections due to natural body flexure modes, the modal suppression system comprising:
- control surface means controllably deploying responsive to input control signals;
- sensor means including one sensor predeterminedly located on the aircraft body to produce an excitation signal representative of excitation of the body in at least two natural modes;
- velocity means for producing a velocity signal representative of aircraft velocity;
- and
- control logic means for producing predetermined control surface control signals responsive to said excitation signal and said velocity signal such that said control surface means is deployed to create forces on the aircraft body to suppress said natural mode excitations.
An aircraft modal suppression control system for suppressing aircraft body deflections due to natural body flexure modes, the modal suppression system comprising:
- control surface means controllably deploying responsive to input control signals;
- sensor means including means predeterminedly located on the aircraft body to produce an excitation signal representative of excitation of the body in at least one predetermined natural mode;
- and
- control logic means including filtering means for predeterminedly filtering said excitation signal to produce control surface control signals of predetermined phase to optimally suppress said natural mode excitations.
Dependencies are inferred from the claim text.