Automatic measurement system for surface parameters of prefabricated component of three-dimension braiding composite material

Abstract

The invention relates to an automatic measurement system for the surface parameters (the braiding angle and the pitch) of a prefabricated component of a three-dimension braiding composite material. The system comprises a hardware portion and a software portion; The hardware portion serves as a collection system of fabrics, and comprises image calibration based on a gauge block and image collection based on a natural light plus Polaroid plus CCD camera scheme; and the software portion serves as a processing system of fabrics images, and comprises image preprocessing with histogram equalization and BMED (block matching 3D) filter, angular point detection and parameter measurement. The Polaroid principle is combined with the CCD camera to effectively reduce adverse influence, caused by surface reflection of the prefabricated component of the carbon fiber material, on image processing; the angular point detection algorithm, in which clone connection, least square fitting, autocorrelation and ACSS are combined, improves the accuracy of ACSS angular point detection algorithm; and each braiding angle and each pitch of images of the prefabricated component of the three-dimension braiding composite material can be measured automatically.

Description

technical field [0001] The invention relates to an automatic measurement system for surface parameters of three-dimensional braided composite material prefabricated parts. The system has better automatic measurement effect on the surface parameters of three-dimensional braided composite material prefabricated parts made of carbon fiber, belongs to the technical field of image processing, and can be applied to three-dimensional Automated measurement of preform surface parameters (braid angle and flower pitch) in the weaving field. Background technique [0002] Three-dimensional braided composite material is a new kind of network structure composite material. It was produced with the emergence of three-dimensional overall weaving high-tech textile technology in the 1980s. Three-dimensional braided composite material technology uses three-dimensional braiding technology to weave fiber bundles into the required structural shape to form a prefabricated part, and then use the pre...

AI Technical Summary

Problems solved by technology

First of all, the three-point angle measurement method and the four-point angle measurement method need to manually point the fabric image on the computer display screen. This method has strong subjective dependence and low automation; the method of measuring the average braiding angle based on the angular power spectrum It is not suitable for measuring a single weaving angle; the measurement of weaving angle based on the curve fitting method depends on the quality of the curve fitting; the measurement of flower node length based on the wavelet transform multi-resolution analysis method depends on the fabric image template The interception of and the solution of related parameters

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