🤖 AI Summary
Existing data-driven mechanical fault diagnosis (MFD) research lacks a systematic analysis of industrial deployment challenges—particularly regarding noise robustness, feature transferability, and adaptability to unknown faults. To address this gap, this paper proposes the first comprehensive, multi-dimensional taxonomy covering signal processing, feature learning, model generalization, and industrial deployment, enabling unified evaluation of deep learning, graph neural networks, and physics-informed methods across their applicability boundaries. The survey systematically reviews key techniques—including time-frequency analysis, 1D-CNNs, LSTMs, Transformers, self-supervised pretraining, and digital twin–assisted diagnosis—and synthesizes optimal method combinations for twelve representative fault scenarios. It identifies three critical bottlenecks hindering real-world adoption: few-shot learning, cross-operating-condition transfer, and model interpretability.