Nonlinear dynamic model for skidding behavior of angular contact ball bearings

Han, Qinkai; Chu, Fulei

doi:10.1016/j.jsv.2015.06.008

Cited by 129 publications

(36 citation statements)

References 23 publications

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“…Slip conditions can be extracted from the frequency signature. Several papers describe techniques to quantitatively assess the initiation and amount of roller slippage . However, given the limited duration of the event in our measurements and limited component‐level tests and simulation done on the bearing used in our experiments, we use a more qualitative approach.…”

Section: Analysis Of the Characteristic Bearing Frequenciesmentioning

confidence: 99%

Gearbox high‐speed‐stage bearing slip induced by electric excitation in a test facility

2018

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The goal of this paper is to investigate the behaviour of the high-speed stage of a wind turbine gearbox during transient grid-loss events triggered at different power levels in a full-scale nacelle dynamometer test. The gear mesh behaviour and the bearing roller slip during these events are characterized by strain measurements placed in the gear teeth roots and embedded in the outer rings of the tapered roller bearing locating pair. From our experiments, we conclude that the high-speed stage experiences a multidimensional loading consisting of bending and torsional deformation during the transient event. This loading propagates throughout the gearbox and results in unfavourable loading conditions at the bearing that have the potential to go beyond the preload during the torque reversals that occur during the grid-loss event. During the torque reversal, roller slip can occur in the bearings. It is observed that the slip behaviour is directly linked to the initial power level of the generator.Electrically induced excitation that typically leads to dynamic torque events can therefore cause mechanical gearbox degradation.An emergency stop is a good example of a transient event. As a braking mechanism, the blade pitch is changed to its maximum value as fast as possible to stop the turbine and keep it safe. It is suspected that these events significantly influence turbine and subcomponent lifetime. This hypothesis is shared by many researchers. Bruce et al use simulations to show that during emergency stop events, the HSS bearings can be overloaded, thereby causing excessive stress. 7 Also, Heidenreich et al link torque reversals that occur during emergency stops to the thickness of the bearing oil film as a possible explanation for premature failure. 8,9 Further, Greco et al link white etching crack phenomena that causes premature bearing failure to extreme loads as likely being induced by emergency stops or generator power line losses. 10 Most experimental investigations discussed in literature are based on bearing-level test rigs, general experience from the field, or simulations of the whole turbine system. Full-system tests, however, are not documented often. Dynamometer testing can help understand which mechanisms govern the HSS behaviour during the most important dynamic events because the dynamometer environment offers full control of testing conditions. In addition, certain dynamic events can be reproduced by defining the speed and torque inputs, and both external and internal gearbox instrumentation can be used because the gearbox is easier to access. This work focuses on the grid-loss event conducted in a full-scale dynamometer test with the complete nacelle. During this test, the generator currents go to zero almost instantaneously while the gearbox is still at full speed. The grid-loss test is initiated at different power levels to understand the consistency in system response to such an event. We focus particularly on the HSS bearing and gear response to the grid-loss event.

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Section: Analysis Of the Characteristic Bearing Frequenciesmentioning

confidence: 99%

Gearbox high‐speed‐stage bearing slip induced by electric excitation in a test facility

2018

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“…LANIADO-JACOME 等 [10] 建立滚子轴承有限元接触仿真模型，研究滚子与内外滚道之间的滑动。 JAIN 等 [11] 忽略离心力和陀螺力对接触角的影响，建立了风电装备高速输出轴轴承的动力学模型，研究了滚动体的打滑特性。邵毅敏等 [12] 针对某车用深沟球轴承，建立滚动体自转和公转两自由度动力学模型，研究了滚动体进入载荷区所出现的咬入滑动现象，并考虑转子加速等瞬态工况的影响规律。最近，作者 [13] 基于 EULER 方程建立了角接触轴承时变动力学模型，初步分析了滚动体三维空间运动行为。尽管国内外相关学者均对轴承打滑的动力学问题进行了一些研究工作，但研究对象局限于止推滚动轴承(承受轴向载荷)和深沟球轴承(承受径向载荷)。近期，刘红彬等 [14] 、贾永川和邓四二 [15] …”

Section: 润滑状态下轴承的打滑动力学仿真。unclassified

Dynamic Skidding Behavior of Skew Cylindrical Roller Bearings under Time-variable Loads

Han¹

2017

JME

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Abstract：Considering the radial clearance and roller crown profile, the load distribution analysis of cylindrical roller bearings under combined radial forces and bending moments is conducted by utilizing the slice method to solve the three dimensional line contact problem. The time-variable friction forces and moments between the skew roller and inner/outer raceways are then derived based upon the Hertz contact theory and elastohydrodynamic lubrication. By taking the discontinuous contacts between the roller and cage into account, a nonlinear dynamic model is established for analyzing the skidding behavior of skew cylindrical roller bearings under time-variable loads. Through comparisons with both reference and experimental results, the proposed model is verified. From detailed numerical simulations, it is shown that increasing the values of radial load, bending moment or amplitude of time-variable load would all reduces the maximum roller slipping velocity, and attenuates the roller skidding. After considering the time-variable radial load, the frequency of time-varying slipping velocity is not the orbital speed but the combination of the inner race frequency and orbital speed.Key words：cylindrical roller bearing；dynamic skidding；time-variable load；skew roller 0 前言 *

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“…Han focused on the skidding behavior of the rolling bearings and pointed out that the skidding behavior varied periodically and led to the change of slipping frequencies. e radial and axial load had obvious impact on the skidding situations and should be considered carefully in the design of rotating machinery [12,13]. Other factors such as lubrication conditions [14][15][16], cage shape [17,18], and other structural parameters [19][20][21] were also investigated and proved to have effects under specific working conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Thermal‐Related Fit Clearance between Outer Ring and Pedestal on the Vibration of Full Ceramic Ball Bearing

Shi

Bai

Zhang³

et al. 2019

Shock and Vibration

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Full ceramic bearing can work under a wide range of temperatures, but the thermal deformation difference between the ceramic outer ring and steel pedestal has a great increase with the rise of temperature and leads to obvious impact and friction. In this paper, the thermal deformation difference is considered and the fit clearance is taken as the boundary condition of the dynamic model. Investigations on the dynamic response of the outer ring are conducted, and the effect of thermal-related fit clearance is analyzed at different working temperatures and rotation speeds through parametric study and experiments. Results show that the vibration of the outer ring grows with the temperature and shows different changes with rotation speed as the temperature changes. The variation of working temperature brings difference in the interactions between the outer ring and the pedestal, and the trends of vibration with rotation speed also change at different temperatures. Impact and friction make great contributions to the interactions between the outer ring and the pedestal and show different changes with temperature. This study puts forward a method for the calculation of bearing vibration at variable temperatures and provides theoretical basis for the application of the full ceramic bearings.

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Nonlinear dynamic model for skidding behavior of angular contact ball bearings

Cited by 129 publications

References 23 publications

Gearbox high‐speed‐stage bearing slip induced by electric excitation in a test facility

Gearbox high‐speed‐stage bearing slip induced by electric excitation in a test facility

Dynamic Skidding Behavior of Skew Cylindrical Roller Bearings under Time-variable Loads

Effect of Thermal‐Related Fit Clearance between Outer Ring and Pedestal on the Vibration of Full Ceramic Ball Bearing

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