Evaluation Methods for Damage of Aircraft Brake Moving Disc Based on Image Segmentation

Abstract

There exists several problems such as low detection efficiency and strong subjectivity in evaluation for damage of aircraft brake moving disc based on personal experiences. This paper proposes a new evaluation method based on the image segmentation. This study reviews the backgrounds and literature of related researches and analyzes the various categories and features of brake moving disc. The image data set of damage area has been semantically segmented base on U-Net model and the model for quantitative analysis of the rust area and the calculation model for maximum radial width in shedding area have also been constructed. Finally, the image data of brake moving disc on Cessna 525 has been used to validate these models. The results show that: (1) the image segmentation of different categories of brake moving discs based on U-Net model works well and the average accuracy, average recall rate, average pixel accuracy and average ratio of Intersection over Union are 91%, 91%, 90% and 87% respectively. (2) the evaluation result for damage of brake moving disc is consistent with the empirical judgement form mechanics, thus verifying that the proposed algorithm is reasonable and feasible. The research results provide a reference basis for mechanical engineers to scientifically and quantitatively determine the degree of damage to aircraft braking moving disc and replacement needs.