A low-velocity impact energy recognition system for variable-thickness composite laminates and its working method

Abstract

The invention discloses a variable-thickness composite material laminated plate low-speed impact energy identification system and an operating method thereof. The variable-thickness composite materiallaminated plate low-speed impact energy identification system is formed by a plurality of fiber grating sensors, an energy monitoring precaution device, a fiber grating demodulation instrument and acomputer, wherein the energy monitoring precaution device utilizes a whitening empirical mode decomposition key algorithm to extract the impact aliasing signal characteristic value, establishes a variable-thickness plate impact energy characteristic set, determines the comprehensive thickness coefficient according to the first order component of a sensing network signal, corrects the energy characteristic set, and evaluates the impact energy through the impact energy characteristic constant of a sample signal; and when the composite material plate bears the low-speed impact load, the energy monitoring precaution device can accurately identify the impact energy.

Description

technical field [0001] The invention relates to monitoring and identification of impact energy of a composite material plate, in particular to a low-velocity impact energy identification system of a variable-thickness composite material laminate and a working method thereof. Background technique [0002] With the rapid development of modern high-tech, especially the development of the aerospace field at home and abroad, the use environment of materials is getting worse and worse, and the requirements for materials are becoming more and more stringent. New material technology is a high-performance new material developed to meet the needs of high-tech development. Compositing is an important development direction of new materials, and it is also one of the most vital branches of new materials. Composite materials have developed into one of the four major material systems alongside metallic materials, inorganic non-metallic materials, and polymer materials. [0003] Composite ...

AI Technical Summary

Problems solved by technology

But there are such shortcomings: the method of ultrasonic C-scanning takes a long time, especially the detection of large-area damage takes longer, and it is an off-line monitoring method. Although the scanning result can give the size and shape of the damage area, it cannot give the impact Energy Test Results

In recent years, scholars from various countries have studied composite material variable thickness structures, but due to the serious aliasing of impact signals of composite material variable thickness laminates, there are few related studies on impact monitoring.

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