中国机械工程 ›› 2026, Vol. 37 ›› Issue (9): 2153-2165.DOI: 10.3969/j.issn.1004-132X.2026.09.008

• 智能诊断与运维专栏 • 上一篇    

面向样本不平衡的机翼大梁裂纹损伤识别方法

王雷1(), 付海朋2(), 秦中瑞2   

  1. 1.中国民航大学工程技术训练中心, 天津, 300300
    2.中国民航大学电子信息与自动化学院, 天津, 300300
  • 收稿日期:2025-10-27 出版日期:2026-09-25 发布日期:2026-10-21
  • 通讯作者: 付海朋
  • 作者简介:王雷,男,1987年生,实验师。研究方向为数据分析与智能故障诊断。E-mail:lei_wang@cauc.edu.cn
    付海朋*(通信作者),男,2000年生,硕士研究生。研究方向为人工智能与故障诊断。E-mail:1713018257@qq.com。
  • 基金资助:
    中央高校基本科研业务费专项资金(3122024045);天津市教委科研计划项目(自然科学)(2018KJ237)

A Sample-imbalance-oriented Method for Crack Damage Identification in Wing Spars

WANG Lei1(), FU Haipeng2(), QIN Zhongrui2   

  1. 1.Engineering Techniques Training Center,Civil Aviation University of China,Tianjin,300300
    2.College of Electronic Information and Automation,Civil Aviation University of China,Tianjin,300300
  • Received:2025-10-27 Online:2026-09-25 Published:2026-10-21
  • Contact: FU Haipeng

摘要:

针对机翼大梁裂纹检测中普遍存在的类别样本不平衡问题,提出了一种基于跨尺度特征融合的改进Swin Transformer V2(CSFF-ISTV2)裂纹分类模型,并设计了三元组动态权重平衡损失函数。在Swin Transformer V2模块中引入全局注意力机制,增强全局长距离依赖建模能力,同时结合门控线性单元与Swish激活函数优化多层感知机,提高特征表达精度;构建跨尺度注意力融合结构,弥补单尺度感受野特征提取不足的缺陷;通过三元组动态权重平衡损失强化少数裂纹样本的识别能力。实验结果表明:在多类别显著样本不平衡工况下,所提模型几何平均准则值为86.27%,准确率为98.29%;相较于基线Swin Transformer V2,两项指标分别提高了33.5%和4.44%。

关键词: 机翼大梁, 损伤识别, Swin Transformer V2, 特征融合, 权重平衡

Abstract:

Aiming at the problem of class sample imbalance in crack detection of wing spars, a crack classification model was proposed based on cross-scale feature fusion with an improved Swin Transformer V2(CSFF-ISTV2), and a triplet dynamic weight balance loss function was designed. First, the global attention mechanism was introduced into the Swin Transformer V2 module to enhance the global long-range dependence modeling ability. At the same time, the multi-layer perceptron was optimized by combining the gated linear unit and the Swish activation function to improve the accuracy of feature expression. Second, a cross-scale attention fusion structure was constructed to make up for the deficiency of single-scale receptive field feature extraction. Finally, the recognition ability of a few crack samples was enhanced by the triplet dynamic weight balance loss. The experimental results show that the geometric mean criterion value of the proposed model is 86.27% and the accuracy is 98.29% under the condition of significant sample imbalance across multiple categories. Compared with the baseline Swin Transformer V2, the two indicators are improved by 33.5% and 4.44%, respectively.

Key words: wing spar, damage identification, Swin Transformer V2, feature fusion, weight balancing

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