Control Allocation Method for Multi-mode Conversion of Rotary Wing Aircraft

Abstract

The present invention proposes a control distribution method for multi-mode conversion of a rotary wing aircraft, by calculating the dimensional control derivatives of the helicopter control system and the factorial control derivatives of the fixed wing control system at several forward flight speeds during the conversion flight phase of the rotary wing aircraft. The second control derivative can obtain a linear change curve of the total control derivative with the change of forward flight speed, and then obtain the value that the helicopter mode control derivative should have at the corresponding forward flight speed, and obtain the weight of the helicopter control input by fitting after dimensionless The change curve of the coefficient with the forward flight speed. At the corresponding forward flight speed, the control input of the fixed-wing mode is directly transmitted to the actuator of the fixed-wing mode, and the helicopter control input is combined with the corresponding weight coefficient and then transmitted to the actuator of the helicopter mode. The invention can solve the problem of redundant control of two sets of control systems in the conversion flight phase of the rotary wing aircraft, so that when designing the flight control system, it is the same as dealing with conventional aircraft, and only needs to give three-axis control commands.

Description

technical field [0001] The invention relates to a control distribution method for multi-mode conversion of a rotary-wing aircraft, which is suitable for the switching and control of various flight modes involved in the flight of the rotary-wing aircraft. Background technique [0002] The rotary-wing aircraft is a new type of manned / unmanned aircraft that combines the vertical take-off and landing performance of a helicopter and the high-speed cruise performance of a fixed-wing aircraft. The patent number is ZL201110213680.1, and the Chinese patent titled "A Rotary Wing Aircraft with Variable Flight Mode" is a typical model. The aircraft can realize helicopter flight mode, fixed-wing flight mode and conversion flight mode. A rotary-wing aircraft has an aerodynamic layout with three airfoils, including canards, rotary wings and tail. Among them, the main wing, that is, the rotating wing, can be used as a rotor in the helicopter flight mode to provide the aircraft with the pu...

AI Technical Summary

Problems solved by technology

However, in the switching flight mode, the pilot's control command will act on the helicopter control system and the fixed-wing rudder surface at the same time. If the corresponding control distribution design is not carried out at this time, the control effect of the same control command will be different. This is obviously unacceptable

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