Effect of Unbalanced Rotor on the Dynamics of Cylindrical Roller Bearings

Sharma, Aditya; Amarnath, M.; Kankar, Pavan Kumar

doi:10.1007/978-3-319-06590-8_136

Cited by 15 publications

(3 citation statements)

References 15 publications

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“…The stress is mainly concentrated on the contact zone between the inner ring and rollers. [38][39][40] The inner raceway surface is flattened by the glass rollers (Fig. 13 b).…”

Section: Failure Simulationmentioning

confidence: 99%

Dynamic Analysis of Outer and Inner Race Defects on Thermoplastic Rolling Bearing System Using Implicit Finite Element Method

Gaaliche¹,

Chithambaram²,

Fathallah³

2022

The International Journal of Acoustics and Vibration

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This paper proposes an improved finite element dynamic model to analyze the vibration response of a rolling bearing system. The vibration responses of defect free and defective polypropylene (PP) bearings are analyzed using the finite element analysis and compared with the experimental results using the in house developed bearing fatigue test rig. The boundary conditions of this model are imposed to ensure an adequate homogeneity with the experimental apparatus. This study considers the viscoelastic property of thermoplastic to investigate the effect of the flexibility and damping viscosity of material. The three-dimensional dynamic analysis detects the vibrations produced in a rolling bearing system. Modal frequencies and the vibration modes shapes which must be avoided had been determined. Monitoring the evolution of vibration signatures as a function of defect location is also carried out using Finite Element Analysis (FEM). Test results reveal that peak vibration amplitudes are more pronounced in an inner ring defect than in an outer ring defect. Vibration signals of stainless-steel bearings are investigated to compare the performance of the thermoplastic bearings with its metallic counterparts. Both test and simulation results reveal that a lower level of vibration is observed with PP bearings compared to that of metal. The PP bearings not only dampen vibrations, but also accommodate shaft misalignments unlike their steel counterparts. Once overall vibration spectrums results are validated, Von Mises stresses within the rings are evaluated under excessive loading conditions. The simulation results show that stress is high in raceways where the balls are compressed between the raceways. Computational results agree well with the experimental tests for the test scenarios.

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“…The stress is mainly concentrated on the contact zone between the inner ring and rollers. [38][39][40] The inner raceway surface is flattened by the glass rollers (Fig. 13 b).…”

Section: Failure Simulationmentioning

confidence: 99%

Dynamic Analysis of Outer and Inner Race Defects on Thermoplastic Rolling Bearing System Using Implicit Finite Element Method

Gaaliche¹,

Chithambaram²,

Fathallah³

2022

The International Journal of Acoustics and Vibration

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“…The results showed that permutation entropy can effectively diagnose and detect the dynamic changes and characterize the bearing operating conditions. Sharma et al 123,124 have employed Poincare´maps and other response plots for the stability analysis of the healthy unbalanced rotor-bearing system, equipped with cylindrical roller bearings. The authors analyzed the responses of the system over a wide range and the results showed that the dynamic behavior of the system is sensitive to small variations of the system parameters and Poincare´maps can be used for common analysis of the system.…”

Section: Nonlinearity Analysis Techniquesmentioning

confidence: 99%

Nonlinear dynamic investigations on rolling element bearings: A review

Sharma

Upadhyay

Kankar

et al. 2018

Advances in Mechanical Engineering

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Rolling element bearings are one of the most precarious components and play an important role in the effective operation of rotating machinery. Bearings are one of the foremost sources of nonlinearity in rotating machineries which significantly affect the behavior of the system. The main sources of nonlinearity are radial internal clearance, unbalanced force, bearing preload, stiffness, damping, number of rolling element, and so on. Surface defects such as localized and distributed defects are also accountable for the nonlinear behavior of the system. A large number of studies and methodologies have been proposed in the last two decades to understand the nonlinear dynamic behavior of rolling element bearings considering various bearing parameters and surface defects. In this work, the authors have presented a review of different theoretical models and experimental works proposed for the analysis of the nonlinear behavior of rotating systems. This review article first quotes various techniques which have been explored for the nonlinearity analysis in rolling contact elements such as rotor-bearing system and gears. Some of the important gaps are highlighted in this work which can be considered for future studies.

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“…Gupta et al [29] also utilized Lyapunov exponent as a quantitative measure of chaos in their study and concluded that, in some of the considered cases, Lyapunov exponent is the only tool to observe the nature of the rotor-bearing system. Sharma et al [30] developed an analytical model of the rotor-bearing system for the investigations of nonlinear vibrations. The authors employed Poincaré maps for the analysis of unstable regimes and summarized the nature of the system at various rotational speeds.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear dynamic analysis of defective rolling element bearing using Higuchi’s fractal dimension

2019

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In the present study, localized surface defects are modelled in inner race and outer race, and nonlinear dynamic behaviour of the system has been observed and quantified using Higuchi's fractal dimensions. The Hertzian contact among the rollers and races, clearance and nonlinear damping are considered as sources of nonlinearity. Dynamic responses show system behaviour as periodic, quasi-periodic and chaotic at different rotor speeds. The onset of chaotic motion is identified using Poincaré maps and Higuchi's fractal dimensions. The system shows low peak-to-peak amplitude of vibration responses at higher speeds in the presence of defects. Results also indicate that Higuchi's fractal dimensions can be effectively used as a diagnostic tool for health monitoring.

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Effect of Unbalanced Rotor on the Dynamics of Cylindrical Roller Bearings

Cited by 15 publications

References 15 publications

Dynamic Analysis of Outer and Inner Race Defects on Thermoplastic Rolling Bearing System Using Implicit Finite Element Method

Dynamic Analysis of Outer and Inner Race Defects on Thermoplastic Rolling Bearing System Using Implicit Finite Element Method

Nonlinear dynamic investigations on rolling element bearings: A review

Nonlinear dynamic analysis of defective rolling element bearing using Higuchi’s fractal dimension

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