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A Method for Determining Lift Force and Drag Moment of Helical Wing

A technology of drag torque and determination method, applied in the field of aircraft control, can solve the problems of limiting the movement range of the aircraft, difficult mathematical model, large amount of calculation, etc., to achieve the effect of being concise and easy to understand, improve feasibility, and reduce the difficulty of placement

Active Publication Date: 2017-09-29
BEIJING INST OF AEROSPACE CONTROL DEVICES
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  • Abstract
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AI Technical Summary

Problems solved by technology

The magnitude of its force is proportional to the rotational speed, and the shape of the spiral wing has a direct impact on its lift, but the shape of the spiral wing is not fixed, so it is very difficult to establish a unified mathematical model
At present, most of the rotorcraft control adopts the method of fuzzy control. This method is simple in modeling, but has a large amount of calculation. In the application of small unmanned aerial vehicles (such as quadrotor aircraft), wireless data transmission must be carried out Human-machine control, which limits the range of motion of the aircraft and also limits its use

Method used

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  • A Method for Determining Lift Force and Drag Moment of Helical Wing

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Embodiment Construction

[0047] like figure 1 As shown, the present invention provides a method for determining the lift force and drag moment of a helical wing, and the steps are as follows:

[0048] (1) According to the laser 3D imaging stereo method based on the cooperative target, the helical wing is scanned by laser, and the point cloud on the surface of the helical wing is obtained, such as figure 2 and image 3 shown; figure 2 The laser scanning process is described in , the measured object is placed on a uniform turntable rotating at an angular velocity of Ω, the coordinate axis and laser position are shown in the figure, and R is the measured value. image 3 In is a schematic diagram of the point cloud obtained after scanning.

[0049] Specifically:

[0050] (1.1) Put the propeller on the uniaxial turntable, and place one of the blades of the propeller along the angular velocity direction of the uniaxial turntable;

[0051] (1.2) Make the single-axis turntable rotate at a constant spee...

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Abstract

A method for determining the lift force and drag moment of a helical wing. First, the three-dimensional point cloud of the helical wing is scanned by using the laser three-dimensional imaging method based on the cooperative target, and then one of the blades is analyzed by using the characteristic of the central symmetry of the helical wing. First divide the blade into n equal parts, then extract the geometric features of each part and calculate the lift coefficient and drag moment coefficient, and then superimpose the lift coefficient and drag moment coefficient of each part to obtain the lift coefficient and drag moment coefficient of the spiral wing coefficient. Finally, the relationship between the lift and angular velocity of the screw wing derived from the air resistance model and the relationship between the drag torque and angular velocity of the screw wing can be used to determine the lift and drag torque of the screw wing. The method can scan the spiral wing of any shape, and give the relationship between the lift force of the screw wing and its resistance moment and the angular velocity, and has wide applicability.

Description

technical field [0001] The invention relates to a method for determining the lift force and drag torque of a helical wing, and belongs to the technical field of aircraft control. Background technique [0002] Rotorcraft, such as helicopters as small as quadrotors, are a type of aircraft. The rotor is the main propulsion device. There are no advantages. In some cases where the geographical environment is complex, the space is small, and the need to continuously pay attention to a certain area, the rotorcraft is undoubtedly the most suitable choice. In terms of unmanned aerial vehicles, rotorcraft can be miniaturized, making it flexible, concealed, easy to operate, flexible in configuration, and have a wider range of operations. For example, it can be used for reconnaissance and individual combat in the military; for some large-scale monitoring, such as pipeline patrols, farmland disease and insect pest monitoring, small rotor drones can complete tasks more efficiently; in ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 魏宗康吕腾赵龙郭子伟
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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