Vibration and stability analysis of rotor-bearing-pedestal system due to clearance fit

Cao, Hongrui; Shi, Fei; Li, Yamin; Li, Bijian

doi:10.1016/j.ymssp.2019.106275

Cited by 66 publications

(30 citation statements)

References 22 publications

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“…Since these stiffness elements are all related to the relative motions of the flywheel rotor and the concentrated mass of the support, and the fit clearances between the inner and outer rings of the bearing, sleeve and pedestal structure, K 1 is a non-linear matrix related to the degree of freedom vector q of the system. In order to solve the vibration model of the rotor-bearing-pedestal system shown in (28), numerical iteration integration is needed.…”

Section: Dynamic Model Of the Rotor-bearing-pedestal Systemmentioning

confidence: 99%

“…Modal tests and simulations have been conducted to verify the correctness of the model. Based on the rotor rigid element model and lumped parameter model, Cao et al [28] established a model considering the fit clearance between the bearing outer ring and the pedestal, and the phase trajectory plots were used to illustrate the stability changes of the system under the influence of the fit clearance. These studies assumed that the contact stiffness between the bearing outer ring and the pedestal is constant.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Dynamic Analysis of Rotor-Bearing-Pedestal Systems With Multiple Fit Clearances

Han

Wang³

et al. 2020

IEEE Access

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Dynamic analysis of a rotor-bearing-pedestal system with multiple bearing clearances is conducted in this study. Firstly, Jones-Harris method is used to deduce the equivalent nonlinear support stiffness of angular contact high-speed ball bearing with preload considered. Ignoring the structural deformation, the contact model of inner and outer rings with clearance is used to describe the clearance fit between the outer ring and the sleeve, and between the sleeve and the bearing pedestal. Based on Hertz contact theory, the discontinuous and nonlinear support stiffness is then obtained. The lumped parameter model of rotorbearing-pedestal system is established and verified based on dynamic test results. Based on this, the influence of clearance fit parameters and external excitation parameters on the vibration response amplitude of the system is analyzed. When the radial displacement is greater than the fit clearance, the radial support stiffness changes abruptly and increases rapidly. If it increases to a certain value, the increase of radial stiffness would slow down. The vibration response curve appears sub-harmonic resonances and amplitude jump. The increase of the fit clearance aggravates the vibration response level, the resonance speed of the system moves to the low speed, and the jumping phenomenon becomes more prominent, which is not conducive to the stable operation of the rotor system.

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Section: Dynamic Model Of the Rotor-bearing-pedestal Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nonlinear Dynamic Analysis of Rotor-Bearing-Pedestal Systems With Multiple Fit Clearances

Han

Wang³

et al. 2020

IEEE Access

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“…. Therefore, the total radial force generated over the entire (10) During the contact between the disc and shaft, it is assumed that the contact of each micro-protrusion meets the Coulomb law of friction. Let  is the friction coefficient at the contact point, and…”

Section: Mathematical Model 21 the Contact Model Of Disc-shaftmentioning

confidence: 99%

“…The existing research on non-rotating components mainly focus on the coupling failure and vibration characteristics [6][7][8][9][10][11]. However, there are few studies on rotating parts.…”

Section: Introductionmentioning

confidence: 99%

Vibration Characteristics of Rotor System with Loose Disc Caused by the Insufficient Interference Force

Li¹,

Qiao²,

Wei³

et al. 2020

Preprint

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The loose of mechanical parts is one of the common failures in rotating machinery. The current researches of loose fault mainly focus on non-rotating components. However, the loose of disc, which is the main work part in the rotor system, is less paid attention, and the mechanism and dynamics characteristics of the loose fault are also almost ignored. In this paper, a dynamic contact model of the rotor system with loose disc is established considering the microscopic surface topography. Through the numerical simulation, the vibration characteristics of the disc-shaft rotor system are analyzed and discussed. The simulation results are further verified by experiments. The results show that the rotation state of the disc is affected by the rotation speed of the shaft, contact stiffness, a gap between the disc and shaft, damping of the disc, and the rotational damping. When the speed difference between the disc and shaft is zero or large, the collision frequency is mainly composed of one frequency component. When the rotational speed of the disc approaches the shaft, the beating vibration phenomenon of the disc occurs in the horizontal direction. As the decreases of relative speed between the disc and shaft, the disc trajectory changes from ‘circular’ to ‘double ring’ and then ‘circular’. The research results on nonlinear dynamics characteristics of the loose disc has important theoretical value and practical application value, and makes up for its shortcomings in the rotor system with loose disc.

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“…Some studies have indicated that rotational speed is nonlinear with the dynamic performance of the bearing system. [3][4][5] The curve of peak-to-peak of the overall response-rotational speed curve had a very rough appearance. Peak-to-peak of 58.3 rev/s was higher than that of 166.7 rev/s.…”

Section: Introductionmentioning

confidence: 99%

Influence of rotational speed on the impact characteristics caused by a localized defect of the outer raceway in a ball bearing under an axial load

Hou

Wang

Peng³

2020

Proceedings of the Institution of Mechanical Engineers, Part K:

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The rotational speed is a crucial parameter for bearing condition monitor. The present study shows the influence of the rotational speed on the impact characteristics caused by a localized defect of the outer raceway. A 2 Nb + 5-degrees-of-freedom nonlinear dynamic model for a ball bearing is developed. The waviness of bearing components, a localized defect of the outer raceway, and the centrifugal forces of balls caused by rotational speed are involved in the ball bearing model. Spectral kurtosis (SK) analysis and envelope spectrum analysis are used to extract the impact signal and confirm the position of the optimal frequency band affected by the impact signal. The peak of the impact signal rises with the increase in rotational speed. The position of the optimal frequency band affected by the impact signal is a linear piecewise function of the rotational speed. These simulated results are verified through vibration experiments of a ball bearing with a localized defect of the outer raceway under an axial load. In addition, considering both a localized defect on the outer raceway and the waviness of bearing components, only when the size of the localized defect is large enough, can the impact signal overcome the influence of the structural vibration of the system to extract impact characteristics. The case studies of high-speed spindle bearing state diagnosis show that high speed is not conducive to the extraction of the impact characteristics.

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Vibration and stability analysis of rotor-bearing-pedestal system due to clearance fit

Cited by 66 publications

References 22 publications

Nonlinear Dynamic Analysis of Rotor-Bearing-Pedestal Systems With Multiple Fit Clearances

Nonlinear Dynamic Analysis of Rotor-Bearing-Pedestal Systems With Multiple Fit Clearances

Vibration Characteristics of Rotor System with Loose Disc Caused by the Insufficient Interference Force

Influence of rotational speed on the impact characteristics caused by a localized defect of the outer raceway in a ball bearing under an axial load

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