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Visual inspection of aircraft skin:Automated pixel-level defect detection by instance segmentation

Chinese Journal of Aeronautics 2022年第10期35卷 254-264页

作者： Meng DING Boer WU Juan XU Abdul Nasser KASULE Hongfu ZUO College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key Laboratory of Civil aircraft Health Monitoring and Intelligent Maintenance of CAAC Nanjing 210016China

skin defect inspection is one of the most significant tasks in the conventional process of aircraft *** paper proposes a vision-based method of pixel-level defect detection,which is based on the Mask Scoring ***,an attention mechanism and a feature fusion module are introduced,to improve feature ***,a new classifier head—consisting of four convolutional layers and a fully connected layer—is proposed,to reduce the influence of information around the area of the ***,to evaluate the proposed method,a dataset of aircraft skin defects was constructed,containing 276 images with a resolution of 960×720 *** results show that the proposed classifier head improves the detection and segmentation accuracy,for aircraft skin defect inspection,more effectively than the attention mechanism and feature fusion *** with the Mask R-CNN and Mask Scoring R-CNN,the proposed method increased the segmentation precision by approximately 21%and 19.59%,*** results demonstrate that the proposed method performs favorably against the other two methods of pixellevel aircraft skin defect detection.

关键词： aircraft skin Automatic non-destructive testing Defect inspection Instance segmentation Machine vision

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Optimum alternate material selection methodology for an aircraft skin

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Chinese Journal of Aeronautics 2023年第7期36卷 476-488页

作者： Fareed AHMAD Mohammed Al AWADH Sahar NOOR Industrial Engineering Department University of Engineering and TechnologyPeshawar 25000Pakistan Department of Industrial Engineering College of EngineeringKing Khalid UniversityAbha 62529Saudi Arabia

Weight penalty has been a challenge for design engineers of aerospace ***’s high-efficiency combat aircraft undergoes intense stress and strain during flying missions,which require stronger and stiffer materials to retain structural *** metallic materials have been successfully used for the construction of aircraft structures and components,metals still have a low strength-to-weight *** paper aims to develop an alternate optimised material selection methodology to replace the metallic skin of a medium-sized military *** search for the optimum material will result in reduced aircraft weight which will be benefitted by extra payload on the *** selection methodology is comprised of finding design pressure limits on the aircraft skin,and comparison of properties(strength,elastic modulus,shear modulus,etc.)and performance(safety factor,deflection,and stress)of the existing metallic skin with alternate optimised *** comparison was made under aerodynamic pressure,bending force,and twisting *** Fibre Reinforced Polymer/Epoxy(CFRP)Uni-Directional(UD)prepreg(elastic modolus is 209 GPa)was selected as an alternate optimum material to replace the aluminium alloy skin of the aircraft *** selected alternate optimum material resulted in the reduction of aircraft skin weight by 30%.

关键词： aircraft skin Carbon Fibre Reinforced Plastic(CFRP) Material index Material selection methodology Optimum material

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