Progressive Knowledge-Guided Large Language Model Framework for Bearing Fault Diagnosis
渐进式知识引导的大型语言模型框架用于轴承故障诊断
Jinghan Wang, Gaoliang Peng, Yanjun Chen, Wei Zhang, Wentao Wu, Tianchen Liu
AI总结 提出渐进式物理引导多尺度振动信号处理框架,通过81维测量描述符、故障自适应分割和隐式知识编码,在四个数据集上实现98.49%诊断精度并降低12.6倍计算成本。
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基于振动的轴承故障诊断需要解决三个相互关联的测量挑战,包括全局统计特征效率与局部瞬态信号保真度之间的权衡、测量特征对底层故障物理的可追溯性不足,以及跨诊断尺度的多源测量信息融合无效。本文提出一个渐进式物理引导的多尺度振动信号处理框架,在统一诊断流程中解决所有三个挑战。一个源自轴承运动学和特征缺陷频率的81维测量描述符,建立了物理可追溯的特征空间,实现每样本约20毫秒的实时故障筛查。然后,一种故障自适应信号分割机制将分析注意力引导至基于物理先验的故障相关波形区域,无需手动特征工程。在训练过程中,结构化的故障机制知识进一步隐式编码到模型参数中,实现自主多尺度测量融合,推理时无需外部知识依赖。在四个公开基准数据集上,在不同运行条件下验证,该框架实现了98.49%的诊断准确率,相对于信号级基线计算成本降低了12.6倍。可解释性分析证实诊断特征激活与已建立的轴承故障力学一致,支持安全关键工业系统中的测量可追溯性。
Vibration-based bearing fault diagnosis requires resolving three interrelated measurement challenges, including the trade-off between global statistical feature efficiency and local transient signal fidelity, insufficient traceability of measurement features to underlying fault physics, and ineffective multi-source measurement information fusion across diagnostic scales. This paper presents a progressive physics-guided multi-scale vibration signal processing framework that addresses all three challenges within a unified diagnostic pipeline. An 81-dimensional measurement descriptor, derived from bearing kinematic theory and characteristic defect frequencies, establishes a physically traceable feature space enabling real-time fault screening at approximately 20 ms per sample. A fault-adaptive signal segmentation mechanism then directs analytical attention toward fault-relevant waveform regions guided by physics-based priors, without manual feature engineering. Structured fault mechanism knowledge is further encoded implicitly in model parameters during training, enabling autonomous multi-scale measurement fusion without external knowledge dependencies at inference. Validated on four public benchmark datasets under diverse operating conditions, the framework achieves 98.49% diagnostic accuracy with a 12.6-fold reduction in computational cost relative to signal-level baselines. Interpretability analysis confirms that diagnostic feature activations align with established bearing fault mechanics, supporting measurement traceability in safety-critical industrial systems.