Method for monitoring bending moment of airplane wing in real time based on FBG (fiber bragg grating)

Abstract

The invention provides a method for monitoring the bending moment of an airplane wing in real time based on an FBG (fiber bragg grating), and the method comprises the following steps: 1, pasting FBG sensors on the airplane wing; 2, converting a central wavelength signal of the FBG sensor into a stress value of a measurement point; 3, carrying out the solving of a stress of the surface of the airplane wing in an axial direction; 4, calibrating the unit flexural rigidity; 5, calculating the bending moment through the stress value of the measurement point. Through the above steps, n groups of FBG sensors are pasted on the airplane wing, and a known concentrated force is applied to the tail end of an airplane wing rigid shaft. Moreover, the relation between the stress and the bending moment is built through the plane stress state of the surface of the airplane wing, thereby achieving an effect of converting the stresses measured by the FBG sensors into bending moments, and solving a problem of the real-time monitoring of the bending moment of the airplane wing.

Description

Technical field: [0001] The invention provides a method for real-time monitoring of aircraft wing bending moment based on optical fiber grating, specifically relates to real-time monitoring of bending moment of aircraft wing by using optical fiber grating, and is suitable for aircraft in service and in aircraft full-aircraft fatigue tests The invention relates to real-time monitoring of the bending moment of an aircraft wing by using an optical fiber grating, and belongs to the technical field of test and measurement. Background technique: [0002] Aircraft is a structure with high value and maintenance cost, and its safe service is of great significance to both national defense and civilian use. During the whole life cycle of the aircraft, it will experience a specific load history, and the load history of the aircraft is a key factor in determining its service life. The wing is the key to ensure the safe flight of the aircraft, and its bending moment is one of the most im...

AI Technical Summary

Problems solved by technology

At present, my country has not yet realized the long-term, real-time online monitoring of the bending moment of the wing of the aircraft in service. The existing method of wing load research is based on the monitoring method of strain gauges, which can only realize individual aircraft Short-term monitoring, and the measurement equipment is complicated, the calibration process is cumbersome, and the reliability is low. It is impossible to calibrate every aircraft in service, and it is impossible to realize long-term, real-time online monitoring of the aircraft.

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