Transient nonlinear dynamics of the rotor system supported by low viscosity lubricated bearing

Xie, Zhongliang; Yang, Kang; Ji, Jiao; Qin, Weiyang; Yang, Tao; Fu, Chao; Ming, Anbo

doi:10.1063/5.0125258

Cited by 11 publications

(3 citation statements)

References 46 publications

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“…Yang et al [22] extended the partial derivative method to predict the nonlinear dynamic stiffness and damping coefficients of finite-length journal bearings using second-order approximations. Xie et al [23] experimentally studied the dynamic characteristics of water-lubricated bearing-rotor coupling systems at different operating stages.…”

Section: Introductionmentioning

confidence: 99%

Research on the dynamic characteristics of hydrodynamic bearing subjected to base shock loads

Huang,

Chen,

Chen

2024

Preprint

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The safety of hydrodynamic bearings can be significantly affected by base shock loads. This study focuses on investigating the shock dynamic characteristics of hydrodynamic bearings by combining the Euler equations, transient average Reynolds equation, and the asperity contact model. A tribo-dynamic model of hydrodynamic bearings under base shock load is established in this research. To validate the model, the corresponding drop shock tests are conducted on the hydrodynamic bearings, and the experimental and computational results show good agreement, confirming the reliability of the dynamic model. Building upon this foundation, a series of numerical simulations are performed to analyze the influence of various factors on the shock response of hydrodynamic bearings. The results indicate that the shock stiffness of hydrodynamic bearings gradually increases due to base shock loads. The anti-shock resistance capability of hydrodynamic bearings exhibits anisotropic behavior. Additionally, the shock stiffness also exhibits a nonlinear increase with the rotating speed. These findings contribute to a better understanding of the shock response of hydrodynamic bearings and provide valuable insights for designing hydrodynamic bearings with enhanced anti-shock resistance.

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Section: Introductionmentioning

confidence: 99%

Research on the dynamic characteristics of hydrodynamic bearing subjected to base shock loads

Huang,

Chen,

Chen

2024

Preprint

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“…Therefore, bearing structures frequently encounter the problem of wear defects. 4,5 The transient performance during start-up is difficult to accurately capture due to the limitations of current experimental and sensor equipment. 6 For this reason, the transient tribo-dynamic theory research on worn bearings is worthy of intensive investigation.…”

Section: Introductionmentioning

confidence: 99%

Effects of turbulence and bush wear on the transient tribo-dynamic characteristics of water-lubricated bearings

Chen,

Wang,

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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This research proposes a transient mixed elastohydrodynamic model considering turbulence and bush wear, as well as the concept of contact work, to study the transient tribo-dynamic characteristics of water-lubricated bearings. The effects of turbulence, wear depth, and wear deviation angle on transient tribo-dynamic characteristics of water-lubricated bearings are investigated. The findings show that turbulence significantly affects the dynamics of stable conditions and enhances the hydrodynamic effect, but little affects the frictional contact behavior. An appropriate wear depth favors improving the tribo-dynamic characteristics of the water-lubricated bearings, but it deteriorates as the wear depth continuously increases. Negative deviation angles are better for minimizing contact work and enhancing rotor stability. The lubrication and dynamic properties of water-lubricated bearings can be enhanced through a rational approach to wear morphology design. This research is important for the optimal design and diagnosis of water-lubricated bearings wear failures.

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“…Chasalevris et al [17,18] analyzed the exact and approximate solutions of Reynolds equations for journal bearings and obtained the important design parameters and lubrication characteristics of finite journal bearings. Additionally, Xie et al [19] resolved a coupled model involving water film pressure-rotor dynamics equations, conducting comprehensive rotor dynamics analyses encompassing vibration, start-stop, and impact analyses.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of the Rotor-Journal Bearing System Considering Shear and Gaseous Cavitation

Sun,

Shi,

Jiang

et al. 2024

Lubricants

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Part of the gas phase within the bearing emanates from the gaseous lubricating medium generated by the phase transition of the liquid lubricant under low pressure, while the remaining portion originates from the expansion of gases, such as air, present in the lubricant. This study delves into the impact of vapor and gas cavitation on the stability of the rotor-journal bearing system. Utilizing computational fluid dynamics (CFD), a 3D transient lubrication model is developed for the rotor-journal bearing system. This model integrates a combined cavitation approach, encompassing both vaporous and gaseous cavitation phenomena. Based on a new structured dynamic mesh method, the journal orbits are obtained when the journal moves in the rotor-journal bearing system. In vaporous and gaseous cavitation, shear stress and non-condensable gases (NCG) are incorporated successively. Compared with the combined cavitation model, the basic cavitation model journal orbit amplitude is significantly larger than the combined cavitation model. The carrying capacity of journal bearings under the basic cavitation model is overestimated, leading to a more conservative prediction for system stability.

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Transient nonlinear dynamics of the rotor system supported by low viscosity lubricated bearing

Cited by 11 publications

References 46 publications

Research on the dynamic characteristics of hydrodynamic bearing subjected to base shock loads

Research on the dynamic characteristics of hydrodynamic bearing subjected to base shock loads

Effects of turbulence and bush wear on the transient tribo-dynamic characteristics of water-lubricated bearings

Stability Analysis of the Rotor-Journal Bearing System Considering Shear and Gaseous Cavitation

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