Coaxial rotor low-speed mixing
AssigneeSikorsky Aircraft Corporation
InventorsMatthew T. Luszcz, Matthew A. White, Kenneth S. Wittmer
Life of this patent
Estimating the term…
Abstract
A system and method for estimating rotor mixing commands for an aircraft includes receiving signals indicative of reference commands from one or more controllers; receiving signals indicative of airspeed and sideslip angle for the aircraft, the sideslip angle being indicative of a direction of flight for the aircraft; calculating a sine and cosine of the sideslip angle; determining gains for roll and pitch as a function of the airspeed, the determining including referencing a look-up table that indexes the gain constants with the airspeed; and determining the one or more rotor mixing commands from the determined gains, the one or more rotor mixing commands being applied synchronously to the rotors in the aircraft.
Claims15
A method for estimating rotor mixing commands for an aircraft, comprising:
- receiving signals indicative of reference commands from one or more controllers;
- receiving signals from one or more sensors indicative of airspeed and sideslip angle for the aircraft, the sideslip angle being indicative of a direction of flight for the aircraft;
- calculating a sine and cosine of the sideslip angle;
- determining gains for roll and pitch as a function of the airspeed, the determining includes referencing a look-up table that indexes the gain with the airspeed;
- and
- determining the one or more rotor mixing commands from the determined gain, the one or more rotor mixing commands being applied synchronously to the rotors in the aircraft.
A system for estimating mixing commands for an aircraft, comprising:
- a processor that receives signals indicative of reference commands from one or more controllers, receives signals from one or more sensors indicative of airspeed and sideslip angle for the aircraft and determines a sine and cosine of the sideslip angle, wherein the sideslip angle being indicative of a direction of flight for the aircraft;
- and
- a memory that indexes gain constants for roll and pitch with the airspeed;
- wherein the processor determines gains for roll and pitch as a function of the airspeed;
- and
- wherein the processor determines the one or more rotor mixing commands as a function of the determined gains and communicates the one or more rotor mixing command to a servo of a rotor system associated with the processor, the servo being displaced in response to the one or more rotor mixing commands.
Dependencies are inferred from the claim text.