【摘要】 针对动态载荷环境下机械装备金属结构件疲劳裂纹扩展延伸问题，提出一种基于Lamb波损伤特征融合的疲劳裂纹扩展预测模型。首先从Lamb波信号传播特性出发，分析对比对称模式下Lamb波损伤信号和基准信号传播过程中的特性变化，在此基础上提取能够敏感表达结构损伤的相关系数和相位差异特征，通过变量标准化变换后进一步构建出疲劳裂纹扩展预测模型，最后利用金属结构件全寿命周期疲劳实验数据对模型进行验证。结果表明：所提模型能够准确预测动态载荷环境下疲劳裂纹扩展过程，与其他预测模型相比优势明显，可为机械装备关键结构件合理检修计划制定提供一定参考借鉴。更多还原

【Abstract】 In order to solve the fatigue crack extension problem of metal structure component of mechanical equipment under dynamic load environment, a fatigue crack extension prediction model based on Lamb wave damage feature fusion is proposed. Firstly, starting from the spread characteristics of Lamb wave signal, the characteristic variations of Lamb wave damage signal and benchmark signal during spread process under symmetry mode are analyzed and compared, the correlation coefficient and the phase difference features, which can sensitively express the structure damage, are extracted on this basis, and the fatigue crack extension prediction model is further constructed after variable normalization transformation. Finally, this model is verified using the whole life cycle fatigue experimental data of metal structure component. The results show that the proposed model can accurately predict the fatigue crack extension process under dynamic load environment, the proposed model has obvious advantages compared with other prediction models, and can provide a certain reference for making reasonable maintenance plan of mechanical equipment key structure component.更多还原