Hypersonic velocity aircraft wing spar structural reliability analysis method based on stress-strength interference theory

Abstract

The invention discloses a hypersonic velocity aircraft wing spar structural reliability analysis method based on a stress-strength interference theory. The method comprises the steps that according to a geometric structure, proposed by NASA, of a six-degree-of-freedom hypersonic velocity aircraft universal model and an aerodynamic derivative equation, a stress analysis model of a wing spar root is built; flight constraint conditions of different flight phases are determined according to a flight envelope, the structural strength of the wing spar root is analyzed by combining material strength characteristic parameters at different temperatures; a stress-strength interference model is built according to a random load capacity and strength analysis data, and under the situation that the structural strength degrades along with increasing of flight frequency, the structural reliability of the model is calculated. According to the hypersonic velocity aircraft wing spar structural reliability analysis method based on the stress-strength interference theory, the frequency of the random load action on wing spars of an aircraft in the flight course is organically combined with wing spar structural strength degradation, and the accuracy of the reliability analysis is improved.

Description

technical field [0001] The invention belongs to the technical field of structural safety and reliability, and relates to a reliability analysis method for the structural strength of a wing spar of a hypersonic aircraft. Background technique [0002] As one of the most important parts on the aircraft, the main function of the wing is to generate lift and control the flight attitude of the aircraft. During the execution of the mission, the hypersonic vehicle traverses subsonic, transonic, supersonic and hypersonic speeds, and its flight altitude spans the continuous flow region, transition flow region and rarefied flow region. Constantly changing, the interaction between the aircraft and the surrounding atmosphere produces complex aerodynamic interference phenomena, which greatly affects the aerodynamic load distribution, center of pressure and moment on the wing surface. The root of the wing spar not only needs to bear the gravity of the aircraft itself, but also bears the s...

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Problems solved by technology

[0003] In the field of aerospace, the current structural reliability research mainly focuses on rocket and aircraft engine components, aircraft propeller blades, landing gear structures, etc. There are few studies on the reliability analysis of aircraft wings, and the reliability analysis of hypersonic aircraft wings research, there are no relevant research papers

Moreover, in the existing research on reliability analysis, most of them focus on the influence of static stress on structural reliability, and do not consider the influence of load cycles and structural strength degradation on reliability. For example, the paper "Aero-engine Blade Fatigue Life and Reliability Research", "UAV Wing Reliability Analysis Based on Moment Method", and "Sensitivity Analysis of Aircraft Wing Spar Structure Strength Reliability"

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