Dynamic characteristics and damage detection equipment of UAV composite wing in windy sand-hot environment

Abstract

A detection device and detection method for composite wing dynamic characteristics and damage of an unmanned aerial vehicle under wind-sand and heat environments. The detection device comprises an environmental simulation mechanism (1), an excitation and vibration mechanism (2), a rotary working table (3), a multi-point flexible fixture (4), a first speed reducer (5), a first motor (6), a composite wing (7), an automatic detection mechanism (8) and a suspension mechanism (9). The detection device may simulate a wind environment, a thermal environment, a hot air environment and a sand environment to different extents, and accurately positions a damage location and dynamic characteristics by means of the dual detection of a laser vibrometer (34) and an ultrasonic flaw detector (35); the multi-point flexible fixture (4) may achieve non-damage clamping of a composite material, and will not cause damage at a clamping position thereof due to the clamping; the multi-point flexible fixture (4) may cause the composite wing to rotate along with the rotary working table (3) to a suitable excitation and vibration direction, thus ensuring a vibration and excitation effect; and the excitation and vibration mechanism (2) may cause a damaged composite wing to be tested to generate new damage and cracks under different vibration and excitation strengths, which helps a designer evaluate the tendency of decrease in the dynamic characteristics thereof.

Description

technical field [0001] The invention belongs to the technical field of dynamic characteristics and damage detection, and in particular relates to the dynamic characteristics and damage detection equipment of UAV composite wings in a sandstorm-heat environment. Background technique [0002] As military drones continue to evolve, the game-changing tool of any future war will surely be drones. The U.S. uses Predator drones to attack al Qaeda in Yemen and Pakistan. The UK uses drones to equip fighter squadrons. The Israeli army believes that the country with the best drone technology will be the winner in future wars. However, UAV crash accidents are also frequently staged. Since September 2001, there have been more than 400 major UAV crash accidents in the U.S. military, which is comparable to the accidents of U.S. military manned aircraft in the same period. At the beginning of its service, the Predator UAV had 4.79 accidents per 100,000 hours of flight, and the Reaper UAV ...

AI Technical Summary

Problems solved by technology

However, the detection techniques and methods used by the above-mentioned instruments and equipment are single and have single functions.

For objects such as composite wings, traditional damage detection equipment cannot meet the needs of accurate and rapid damage detection for large-scale composite wings; in addition, high-temperature environments will cause composite wings to creep, and this irreversible Plastic deformation will seriously cause the shape and size of the composite wing to change, or even rupture, making it unreliable and unsafe; the wind and sand environment will seriously erode the composite wing, causing cracks and the development of corrosion fatigue. The service life of the composite wing is greatly shortened. However, the above-mentioned traditional, single-function dynamic characteristics and damage detection equipment cannot meet the dynamic characteristics and damage detection requirements of UAV composite wings in the sand-heat environment. Therefore, , it is particularly important to design and invent an equipment system that can simulate the wind-sand-thermal environment and realize the dynamic characteristics and damage detection of UAV composite wings in the above-mentioned complex environment

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