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- 저자 : Zhitao Xiao (검색결과 2 건)
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Surface Parameter Measurement of Braided Composite Preform Based on Faster R-CNN
Zhitao Xiao,Lei Pei,Lei Geng,Ying Sun,Fang Zhang,Jun Wu 한국섬유공학회 2020 Fibers and polymers Vol.21 No.3
Pitch length and surface braiding angle are two important parameters of braided composite preforms. In this paper,a method based on Faster R-CNN is proposed to measure the two parameters. First, after image acquisition, a fabric imagedatabase including initial cropped images, augmented images, and target images is established. Then, the target images areclassified into four categories according to the gray change characteristics. Third, a Faster R-CNN fabric detection model istrained on the fabric image database. Fourth, targets are detected by the trained network, and corners are detected based onthe detected targets. Finally, pitch lengths and surface braiding angles are measured based on the detected corners. Experimental results show that the proposed method achieves the automatic measurement of pitch lengths and surfacebraiding angles of 2D and 3D braided composite preforms with high accuracy.
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Jun Yan,Li Ma,Mengyu Gan,Xiao Li,Zhitao Li,Jihai Tang,Ying Tu,Haifeng Hu 한국고분자학회 2014 Macromolecular Research Vol.22 No.8
In this work, flake-like poly(2,3-dimethylaniline) (P(2,3-DMA)) with enhanced thermal stability andanticorrosive ability was synthesized by in situ polymerization using H2O2/Fe2+ catalytic oxidation system, comparingwith traditional oxidant ammonium persulfate (APS) synthetic method. The structure and morphology of thesamples were characterized Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD) and field-emissionscanning electron microscope (FESEM). The experimental results demonstrated that using H2O2/Fe2+ catalytic oxidationsystem was more inclined to form the two-dimensional P(2,3-DMA) flakes. The enhancement in thermostabilityand corrosion resistance was attributed to the formation of phenazine-like structures in the polymer chains,which could serve as templates to form the flake-like morphology. In addition, using H2O2/Fe2+ catalytic oxidationsystem is more environmental friendly than the APS method that can avoid ammonium pollution on aquatic life aswell as waters.
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