国外文献 > 1.轴承 > 8. 系统与应用 > 系统集成
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| 标 题： |
A comprehensive dynamic model of double-row spherical roller bearing - Model development and case studies on surface defects, preloads, and radial clearance
双列球面滚子轴承的综合动态模型——表面缺陷、预载荷与径向间隙的建模与发展及案例研究 |
| 作 者： |
M. Cao
J. Xiao |
| 关键词： |
Dynamic system modeling [动态系统建模]
Spherical roller bearing [ 圆柱滚子轴承]
Dynamics [ 动力学]
Vibration [ 振动]
Waviness [ 波浪状]
Surface defect [ 表面缺陷]
Health monitoring [ 健康监测] |
| 出版年： |
2008 |
| 期刊名： |
Mechanical Systems and Signal Processing
机械系统与信号处理 |
| 年卷期： |
2008, vol.22, no.2 |
| 摘 要： |
Bearing excitation is one of the most important mechanical sources for vibration and noise generation in machine systems of a broad range of industries. Although extensively investigated, accurately predicting the vibration/acoustic behavior of bearings remains a challenging task because of its complicated nonlinear behaviors. While some ground work has been laid out on single-row deep-grooved ball (DGB) bearing, comprehensive modeling effort on spherical roller bearing (SRB) has yet to be carried out. This is mainly due to the facts that SRB system carries one more extra degree of freedom (DOF) on the moving race (could be either inner or outer race) and in general has more rolling elements compared with DGB. In this study, a comprehensive SRB excitation source model is developed. In addition to the vertical and horizontal displacements considered in previous investigations, the impacts of axial displacement/load are addressed by introducing the DOF in the axial shaft direction. Hence, instead of being treated as pre-assumed constants, the roller-inner/outer race contact angles are formulated as functions of the axial displacement of the moving race to reflect their dependence on the axial movement. The approach presented in this paper accounts for the point contacts between rollers and inner/outer races, as well as line contacts when the loads on individual rollers exceed the limit for point contact. A detailed contact-damping model reflecting the influences of the surface profiles and the speeds of the both contacting elements is developed and applied in the SRB model. Waviness of all the contact surfaces (including inner race, outer race, and rollers) is included and compared in this analysis. Extensive case studies are carried out to reveal the impacts of surface waviness, radial clearance, surface defects, and loading conditions on the force and displacement responses of the SRB system. System design guidelines are recommended based on the simulation results. This model is also applicable for bearing health monitoring, as demonstrated by the numerical case studies showing the frequency response of the system with moderate-to-large point defects on both inner and outer races, as well as the rollers. Comparisons between the simulation results and some conclusions reflecting common sense available in open literature serves as first hand partial validation of the developed model. Future validation efforts and further improvement directions are also provided. The comprehensive model developed in this investigation is a useful tool for machine system design, optimization, and performance evaluation.
轴承激励是众多工业领域机械系统中产生振动和噪声最重要的机械源之一。尽管已进行了广泛研究，但由于轴承具有复杂的非线性行为，准确预测其振动/声学特性仍是一项艰巨的任务。虽然在单列深沟球轴承（DGB）方面已有部分基础研究，但针对圆柱滚子轴承（SRB）的综合建模工作尚未开展。这主要是因为SRB系统的移动轨道（可能是内圈或外圈）额外增加了一个自由度（DOF），且与DGB相比，通常具有更多的滚动元件。本研究开发了一种全面的SRB激励源模型。除以往研究中考虑的垂直和水平位移外，还通过引入轴向方向上的自由度，对轴向位移/载荷的影响进行了分析。因此，滚子内/外圈接触角不再被视为预先假设的常数，而是被设定为移动滚子轴向位移的函数，以反映其与轴向运动之间的依赖关系。本文提出的方法考虑了滚子与内/外圈之间的点接触，以及当单个滚子上的载荷超过点接触极限时的线接触情况。同时，本文建立了一个详细的接触阻尼模型，用于反映接触面轮廓及两个接触元件速度的影响，并将其应用于SRB模型中。分析还纳入并比较了所有接触表面（包括内圈、外圈和滚子）的波纹特性。通过大量案例研究，揭示了表面波纹、径向间隙、表面缺陷以及载荷条件对SRB系统受力和位移响应的影响。基于仿真结果，提出了系统设计的指导建议。该模型同样适用于轴承健康监测，数值案例研究展示了系统在内圈、外圈及滚子上存在中等至较大点缺陷时的频率响应。模拟结果与现有公开文献中一些常识性结论的对比，为所开发模型提供了初步的部分验证。此外，还提出了未来验证工作的方向和进一步改进的建议。本研究建立的综合模型是机器系统设计、优化及性能评估的实用工具。 |
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