Damage detection system of long and thin composite material and detection method thereof

Abstract

The invention discloses a damage detection system of long and thin composite material and detection method thereof. The damage detection system of the long and thin composite material comprise a measurement device for measuring modal shape of the long and thin composite material, a Fourier modal curvature computing module and a judgment module; the modal shape measurement device comprises a force hammer for knocking h measurement points uniformly distributed on the long and thin composite material at intervals, an acceleration sensor for measuring the acceleration of the measurement point and a modal shape measurement module; the modal shape measurement module connected with the acceleration sensor generates the modal shape (WX) based on the acceleration, the Fourier modal curvature computing module computes the Fourier modal curvature (w'x) through the formula (F1), the judgment module is connected with the Fourier modal curvature computing module, if the Fourier modal curvature (w'x) is greater than a predetermined threshold value, the judgment module judges that the measurement point with the Fourier modal curvature (w'x) greater than the predetermined threshold value is the damage position.

Description

Technical field [0001] The invention belongs to the field of nondestructive testing of composite materials, and particularly relates to a damage detection system and a detection method for slender composite materials. Background technique [0002] Composite materials have a wide range of applications in wind turbines, aircraft blades, and aero engines, and have a high incidence of damage. Therefore, rapid damage detection is very important. Traditional non-destructive testing techniques are difficult to meet the requirements of on-line, in-situ and damage detection versatility in engineering structural damage detection to varying degrees. For example, magnetic particle detection methods can only be applied to surface damage detection of ferromagnetic materials, and fluorescence detection methods only It can be applied to the surface crack detection of structural parts and needs to be identified in a special lighting environment. X-ray detection equipment is expensive and electrom...

AI Technical Summary

Problems solved by technology

The patent tracks the displacement of the feature points of the reflective stickers on the thin-walled beams, and can obtain the vibration information of multiple points on the thin-walled parts, and can simultaneously analyze the vibration information of multiple points, and then can obtain the natural frequency and the mode shape under the natural frequency , but the patent needs to track the reflective stickers, which limits the scope of application, and the non-destructive testing cannot be carried out only through the mode shape, and the damage location of the composite material cannot be quickly identified, so it is not suitable for on-site guidance for the one-dimensional structure damage detection of composite materials

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