A real-time monitoring method of wing external load based on grating fiber optic sensor

Abstract

The invention provides a wing external load real-time monitoring method based on a fiber bragg grating sensor. The real-time monitoring method comprises the following steps: a, constructing a fiber bragg grating monitoring system; b, establishing an aircraft wing external load mathematic model, carrying out universe stress calculation on the wing model, and finding out an external load stress concentration area of an aircraft wing; c, arranging the fiber bragg grating monitoring system in the aircraft wing external load stress concentration area; d, continuously applying external load to the aircraft wing, acquiring central wavelength offset data of a fiber bragg grating group by the fiber bragg grating monitoring system through a signal receiver, and drawing a relation curve of the magnitude of the external load and the central wavelength offset data of the fiber bragg grating group, wherein the external load causes strain of a strain gauge, so that the central wavelength of the fiber bragg grating group offsets; and e, mounting a fiber bragg grating detecting system on the aircraft wing, and monitoring real-time load of the wing in a flight process of an aircraft according to the relation curve.

Description

[0001] Patent cross-reference [0002] This application claims the priority right of the Chinese invention patent application with application number CN201510663034.3 submitted on October 14, 2015. technical field [0003] The invention relates to the field of aerospace technology, in particular to a method for real-time monitoring of wing external loads based on a grating optical fiber sensor. Background technique [0004] During the actual flight, the aircraft is subjected to random loads in various environments, and structural damage occurs from time to time. Carry out real-time monitoring of aircraft structure, control its own damage during flight, adopt economical maintenance and structural life health management, and prolong the life of the aircraft. [0005] The external loads on the aircraft during flight are mainly 1) aerodynamic force, 2) mass force, and 3) concentrated loads from other components. When the aircraft is turning or skidding, the side load will be ...

AI Technical Summary

Problems solved by technology

The external load of the aircraft seriously affects the aircraft fuselage and aircraft components. Failure to repair the aircraft fuselage and aircraft components in time will greatly reduce the service life of the aircraft

However, for the impact of the load on the fuselage and aircraft components during the flight of the aircraft, it is currently repaired through experience or when the aircraft fuselage and components are damaged. At this time, the maintenance has already had an impact on the life of the aircraft, reducing the cost of maintenance. aircraft life

[0006] For the real-time monitoring of aircraft flight process, the existing technology usually uses resistive sensors to monitor, and its monitoring effect and accuracy are not accurate enough, and the significance of aircraft maintenance guidance is not strong.

Images