On the Dynamics of Lubricated Cylindrical Roller Bearings, Part II: Linear and Nonlinear Vibration Analysis

Chippa, Shriniwas; Sarangi, Mihir

doi:10.1080/10402004.2013.830799

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…For the small length/diameter ratio inducing minute bending deformation of the rotor, the model adopted here has neglected the tilt and skew effect of roller, which has been considered in the dynamic model of Gupta 25 and Kushwaha et al 21 Significant works on the lubrication of the roller bearings have been done by Rahnejat and Gohar, 4, Rahnejat, 27 and Chippa and Sarangi. 26,28 In this work, the assumption of no slipping between roller and raceways is employed. Additionally, the effect of stiffness from lubricated film is neglected, and only the damping effect is considered.…”

Section: Restoring Force Of Bearingmentioning

confidence: 99%

The resonance effect induced by the variable compliance vibration for an elastic rotor supported by roller bearings

Liu

Martínek

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part K:

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Owing to orbital rotation of the rolling element complement and depending on the state of bearing preload, the dynamic stiffness of bearing alters. This causes a vibration at a frequency equivalent to the number of rolling elements multiplied by the cage speed named as variable compliance vibration, which could be much larger than the system nature frequencies. In this paper, the resonance effect induced by the variable compliance vibration of an elastic rotor is discussed. Simplified bearing and the Timoshenko elements are employed to model the system, and then cascade plots and frequency spectrums are mainly obtained as results with two types of resonance in low-speed region. Firstly, resonance of variable compliance frequency would occur while the variable compliance frequency meets the system nature frequencies, which are different in the horizontal and vertical directions. Secondly, resonance of sub-harmonic frequencies which are close to the system nature frequencies would occur while the variable compliance frequency meets the sum of system nature frequencies.

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Section: Restoring Force Of Bearingmentioning

confidence: 99%

The resonance effect induced by the variable compliance vibration for an elastic rotor supported by roller bearings

Liu

Martínek

et al. 2014

Proceedings of the Institution of Mechanical Engineers, Part K:

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“…Further, these relationship were used in the linear and nonlinear vibration of rotor-bearing system. 7 In most of the reported work on EHL finite line contact analysis, a steady-state condition is assumed. However, in true sense these machine elements are subjected to dynamic loading conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Further, these relationship were used in the linear and non-linear vibration of rotor-bearing system. 7…”

Section: Introductionmentioning

confidence: 99%

Transient elastohydrodynamic analysis of finite line contact under load impulse

Chippa¹,

Borse²

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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Numerical analysis is performed to study the transient behavior of EHL finite line contact of a cylindrical roller and flat plane under load impulse. In the present work, effect of pressure on the density and viscosity of lubricant is considered. Finite difference method is used to discretize the governing equations. Multilevel Multi-integration method is used to calculate the elastic deformation. Moreover, Multigrid method is implemented to accelerate the convergence process. Uniqueness of this finite line contact analysis is that it provides an ability to determine the transient behavior of lubricated contact even at the edges of roller. Results show that the load impulse causes squeezing and separation movement within the contact that develops film dimple and pressure ripples at the inlet region, which propagate towards the exit region due to the entrainment motion. It is noticed that the time taken by oil film [Formula: see text] to travel the Hertzian contact width and the time period [Formula: see text] of load impulse decides the behavior of lubricated contacts. Firstly, under a relatively heavy load when the contact width is large enough so that [Formula: see text], then a significant rise in central film thickness (CFT), central minimum film thickness (CMFT) and minimum film thickness (MFT) occurs after the execution of load impulse. Further, under the light load generating a relatively small contact width such that [Formula: see text], then comparatively a small rise in CFT occurs right during the load impulse. Lastly, for a given load if the time period of impulse [Formula: see text] is large enough satisfying the condition [Formula: see text], then a considerable reduction in CFT, CMFT and MFT takes place during the application of load impulse. Moreover, as compare to other cases, for [Formula: see text] the steady state condition is reestablished after a relatively more number of time cycles. It is observed that the maximum pressure and MFT occurs at the contact edges of roller which can be controlled by a proper choice of the radius of end profile [Formula: see text].

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“…In order to improve the quality of bearing, people have done a lot of research. Shriniwas P. Chippa developed a new method to curve-fit relations of stiffness and damping coefficients of a single roller-to-race contact of lubricated roller bearings [4,5]. Thapliyal P studied the influence of Cu nanofluids on the rolling contact fatigue life of bearing steel [6].…”

Section: Introductionmentioning

confidence: 99%

Study on the Analysis Method of Bearing Vibration Influencing Factors (Part I: Theory)

Xia¹,

Liu²,

Chen³

et al. 2017

dtetr

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Bearing vibration is affected by many factors, and the identification of its influencing factors belongs to the problem of poor information. It is difficult to draw a convincing conclusion by using a single method to analyze. In this paper, a new method is proposed based on the principle of qualitative fusion. The influencing factors of the bearing vibration are comprehensively analyzed by combining membership degree, close degree and gray correlation degree, and then the representative main influencing factors of bearing vibration are obtained.

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On the Dynamics of Lubricated Cylindrical Roller Bearings, Part II: Linear and Nonlinear Vibration Analysis

Cited by 8 publications

References 27 publications

The resonance effect induced by the variable compliance vibration for an elastic rotor supported by roller bearings

The resonance effect induced by the variable compliance vibration for an elastic rotor supported by roller bearings

Transient elastohydrodynamic analysis of finite line contact under load impulse

Study on the Analysis Method of Bearing Vibration Influencing Factors (Part I: Theory)

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