Air-breathing hypersonic unmanned aerial vehicle damage characteristic analysis method

Abstract

The invention discloses an air-breathing hypersonic unmanned aerial vehicle damage characteristic analysis method, which comprises the steps of establishing an unmanned aerial vehicle full-fuselage stress model considering elastic factors, and analyzing unsteady aerodynamic force; according to the obtained stress information, establishing a whole-body damage dynamic model of the unmanned aerial vehicle; establishing an unmanned aerial vehicle longitudinal elastic model, analyzing the key difference between the unmanned aerial vehicle longitudinal elastic model and the longitudinal rigid body model, and demonstrating the necessity of considering the aerodynamic elasticity when the damage characteristics of the air-breathing hypersonic unmanned aerial vehicle are studied; for different flight states, analyzing damage characteristics of each surface of the unmanned aerial vehicle, and determining key variables influencing damage evolution. According to the method, the whole unmanned aerial vehicle body serves as a research object, the influence caused by elastic vibration of the unmanned aerial vehicle in the flight process is fully considered, a damage model and unmanned aerial vehicle flight are dynamically combined, the influence of the attack angle, the flight speed, the height and the rudder deflection angle of the unmanned aerial vehicle on fuselage damage accumulation is analyzed, and key variables influencing fuselage damage are found out.

Description

technical field [0001] The invention belongs to the field of hypersonic unmanned aerial vehicles, and in particular relates to a method for analyzing damage characteristics of a hypersonic unmanned aerial vehicle. Background technique [0002] Air-breathing hypersonic drones have become the focus of technological development in various countries because of their extremely high military application value. At the same time, due to the complex aerodynamic characteristics of UAVs flying at hypersonic speeds, the fuselage is extremely prone to fatigue damage, which accumulates continuously during the flight, endangering flight safety. Therefore, if the fatigue damage of the fuselage is not analyzed timely and accurately, and appropriate measures are not taken to slow down the evolution of the damage, the structural failure of the UAV may occur, and even the aircraft may crash. Therefore, it is of great significance to carry out research on the damage characteristics of hypersoni...

AI Technical Summary

Problems solved by technology

However, there are certain defects in these research results. First, the hypersonic UAV models they studied are all rigid-body models; , during the flight of the drone, due to the elastic deformation of the fuselage surface, unsteady air pressure is formed around the drone, and the fuselage is subjected to unsteady aerodynamic force

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