Transient analysis of non-uniform tilting-pad journal bearing for wind turbine main shaft under dynamical loading

IF 4.5 1区 工程技术 Q1 ENGINEERING, MECHANICAL Mechanism and Machine Theory Pub Date : 2024-09-19 DOI:10.1016/j.mechmachtheory.2024.105792
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Abstract

The non-uniform distributed tilting-pad journal bearing (NDTPJB), designed for large megawatt wind turbine main shafts, has not been assessed for transient stability under typical random wind conditions. Particularly, the dynamic interaction between low-speed, heavy-load operations with varying magnitude and direction, and the bearing's asymmetric structure, has not been fully explored. A new transient tribo-dynamic model is developed to analyze 6MW wind turbine's NDTPJB transient friction behavior, accounting for variable wind loads, pad distribution asymmetry, mixed lubrication (ML), and elastic pivot effects. Key parameters affecting tribo-dynamic friction performance—pad wrap angle, pad distribution count, and pivot stiffness—were comprehensively investigated. Findings show that dynamic loading cause asymmetrical behaviors in main and secondary pads, with performance significantly affected by the number of bottom distributed pads and improved stability with setting the number of above distributed pads to three. The stiffness of pivots significantly and complexly affects bearing dynamics, optimization of stiffness should be conducted after pad distribution determination. These discoveries guide further research and enhancements of NDTPJB in large rotating machinery under low-speed and heavy-load conditions.
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风力涡轮机主轴非均匀斜垫式轴颈轴承在动态载荷下的瞬态分析
为大型兆瓦级风力涡轮机主轴设计的非均匀分布斜垫式轴颈轴承(NDTPJB)尚未对典型随机风力条件下的瞬态稳定性进行评估。特别是,低速、重载、不同幅度和方向的运行与轴承的非对称结构之间的动态相互作用尚未得到充分探讨。本文建立了一个新的瞬态摩擦动力学模型,用于分析 6MW 风力涡轮机 NDTPJB 的瞬态摩擦行为,其中考虑到了可变风载荷、衬垫分布不对称、混合润滑 (ML) 和弹性枢轴效应。全面研究了影响三动态摩擦性能的关键参数--衬垫包角、衬垫分布数量和枢轴刚度。研究结果表明,动态载荷会导致主垫和副垫的非对称行为,底部分布垫的数量对性能有显著影响,而将上面分布垫的数量设为三个时,稳定性会得到改善。枢轴的刚度会对轴承的动力学产生重要而复杂的影响,因此应在确定衬垫分布后对刚度进行优化。这些发现为进一步研究和改进低速重载条件下大型旋转机械中的 NDTPJB 提供了指导。
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来源期刊
Mechanism and Machine Theory
Mechanism and Machine Theory 工程技术-工程:机械
CiteScore
9.90
自引率
23.10%
发文量
450
审稿时长
20 days
期刊介绍: Mechanism and Machine Theory provides a medium of communication between engineers and scientists engaged in research and development within the fields of knowledge embraced by IFToMM, the International Federation for the Promotion of Mechanism and Machine Science, therefore affiliated with IFToMM as its official research journal. The main topics are: Design Theory and Methodology; Haptics and Human-Machine-Interfaces; Robotics, Mechatronics and Micro-Machines; Mechanisms, Mechanical Transmissions and Machines; Kinematics, Dynamics, and Control of Mechanical Systems; Applications to Bioengineering and Molecular Chemistry
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