Large-scale unmanned aerial vehicle take-off front wheel lifting test flight control law and design method thereof

Abstract

The invention discloses a large-scale unmanned aerial vehicle take-off front wheel lifting test flight control law and a design method thereof. The design method comprises the steps: adding a preset skewness of a longitudinal control surface into a longitudinal instruction of a large-scale unmanned aerial vehicle, and controlling an elevator through the preset skewness to enable the large unmannedaerial vehicle to rise in a head-up direction; in the acceleration skating process of the large unmanned aerial vehicle, when the speed of the large unmanned aerial vehicle reaches the set speed, giving a front wheel lifting instruction, wherein the set speed is smaller than the front wheel lifting speed in a normal take-off state; and when the large unmanned aerial vehicle lifts the front wheelaccording to the front wheel lifting instruction, immediately giving an engine shutdown instruction and a reverse deflection instruction of the longitudinal control surface, wherein the engine shutdown instruction is used for decelerating and stopping the large unmanned aerial vehicle, and the reverse deflection instruction is used for controlling the elevator to make the large unmanned aerial vehicle to flight in the head-down direction and controlling the front wheel to be put down. The front wheel can be lifted by the large unmanned aerial vehicle at the speed lower than the front wheel lifting speed in the normal take-off state, and meanwhile, it is guaranteed that the large unmanned aerial vehicle cannot take off from the ground or rush out of a runway.

Description

technical field [0001] The invention relates to the technical field of large-scale unmanned aerial vehicle control, in particular to a control law and a design method thereof for a large-scale unmanned aerial vehicle to take off and lift the front wheel for a flight test. Background technique [0002] Large drones refer to drones weighing more than one ton that need to take off on regular airport runways. Due to the characteristics of UAV control law design, before the first flight of large-scale UAVs, no special test flight with the front wheel was carried out, and there was no control law specially designed for the test flight of UAV with the front wheel. The first flight of the UAV brings risks, and once the large UAV fails to take off, the losses will be relatively large. [0003] Now the main parameters of the normal take-off control law of large UAVs are fixed, and two situations are prone to occur: [0004] 1) The aircraft rolls at high speed on the runway and reach...

AI Technical Summary

Problems solved by technology

During the first flight of the XX UAV, the aircraft failed to take off due to the failure to lift the front wheel when it reached the scheduled take-off speed. The aircraft rushed out of the runway and hit the building and was damaged.

When another UAV was performing a high-speed taxiing test, it took off unexpectedly when it was less than the scheduled take-off speed. Although there was no accident by luck, it was also a serious accident symptom.

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