As the key component of TBM main driving system, the main bearing plays an indispensable role both in its service life and the normal operation of the TBM. While prior investigations predominantly focused on static analyses of the main bearing, only a scant few delved into its dynamic characteristics and the vibration mechanism. In order to explore the dynamic characteristics of TBM main bearing, a comprehensive dynamics model of the TBM main bearing considering local defects is established, the vibration mechanism of the main bearing with local defects is revealed, and the influence of uneven load is investigated. Furthermore, the effects of roller wear and bearing clearance on the vibration response of the main bearing are analyzed, which systematically describes the real motion of the main bearing. Finally, a main bearing scaling test rig is constructed, and the proposed model is validated through experiments and simulations, demonstrating its good accuracy. In addition, the results show that the incremental imposition of uneven load correlated with a rising trend in the root mean square (RMS) value of vibration response. Moreover, maintaining an optimal axial clearance is pivotal in ensuring the reliable operation of the main bearing. The research work in this paper provides theoretical scaffolding for the defect diagnosis of TBM main bearing, whilst also serves as an analytical cornerstone for future explorations into the dynamics of various types of thrust bearings.

中文翻译：

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TBM主轴承缺陷振动机理及动态特性研究


主轴承作为TBM主传动系统的关键部件，无论是其使用寿命还是TBM的正常运行都起着不可或缺的作用。虽然先前的研究主要集中在主轴承的静态分析上，但很少有人深入研究其动态特性和振动机制。为了探究TBM主轴承的动态特性，建立了考虑局部缺陷的TBM主轴承综合动力学模型，揭示了局部缺陷主轴承的振动机理，并研究了不均匀载荷的影响。进一步分析了滚子磨损和轴承间隙对主轴承振动响应的影响，系统地描述了主轴承的真实运动情况。最后搭建了主轴承缩垢试验台，并通过实验和仿真对所提出的模型进行了验证，证明了其良好的准确性。此外，结果表明，不均匀载荷的增量施加与振动响应均方根（RMS）值的上升趋势相关。此外，保持最佳的轴向间隙对于确保主轴承可靠运行至关重要。本文的研究工作为TBM主轴承的缺陷诊断提供了理论支架，同时也为未来探索各类推力轴承的动力学奠定了分析基石。