Study on the stiffness and damping coefficients of water-lubricated rubber bearings with multiple grooves

Zhou, Guangwu; Wang, Jiaxu; Han, Yanfeng; Li, Junyang; Pu, Wei; Wei, Bo

doi:10.1177/1350650115601696

Cited by 16 publications

(10 citation statements)

References 8 publications

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“…The coefficients apparently differed from those considering only static deformation at high eccentricity. Kuznetsov and Glavatskih 9 and Zhou et al 10 established models similar to that proposed by Zhang et al 8 but calculated deformation by plain strain theory and elastic semi-infinite body hypothesis, respectively. Furthermore, Lahmar et al 11 analyzed the influence of whirl frequency on dynamic coefficients.…”

Section: Introductionmentioning

confidence: 92%

Study of dynamic coefficients of water film in marine stern tube bearing considering roughness and deformation

Leng

Zhang³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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Dynamic analysis of water-lubricated marine stern tube bearing is incompatible with that of ordinary oil-lubricated bearing due to the deformation of compliant bushes and non-negligible roughness effects. A modified bearing dynamic analysis model embracing roughness and dynamic characteristics of a non-metal bush is proposed. Based on the model, Reynolds equations of perturbed pressures of water film considering roughness, deformation, and misalignment simultaneously are derived for the first time and solved by coupling the finite difference method and the finite-element method. The results show that dynamic coefficients are enhanced due to roughness when the minimum film thickness ratio exceeds a threshold around 2. The roughness effect is debilitated but the valid range of roughness is extended when bush deformation is considered. Additionally, dynamic coefficients of rougher bearing become obviously smaller than those of smoother bearing as the misalignment angle grows.

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Section: Introductionmentioning

confidence: 92%

Study of dynamic coefficients of water film in marine stern tube bearing considering roughness and deformation

Leng

Zhang³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Traditionally, in the investigation of the dynamic characteristic of MGWJBs, the linear hydrodynamic forces which are calculated from dynamic coefficient are used [6,32]. However, the nonlinear hydrodynamic force gives a more detailed understanding of the dynamic behavior of MGWJBs.…”

Section: Comparison Of Two Hydrodynamic Force Models Of Mgwjbsmentioning

confidence: 99%

Dynamic characteristics of water-lubricated journal bearings

Zhang

Wang

et al. 2019

Mechanics & Industry

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The increasing ecological awareness and stringent requirements for environmental protection have led to the development of water lubricated journal bearings. For the investigation of water-lubricated journal bearings, a new structured mesh movement algorithm for the CFD model is developed and based on this method, the nonlinear transient hydrodynamic force model is established. Then, with consideration of velocity perturbation, a method to determine dynamic coefficients and linear hydrodynamic forces is promoted. After validation of static equilibrium position and stiffness coefficients, a comparative linear and nonlinear hydrodynamic force analysis of multiple grooves water-lubricated journal bearings (MGWJBs) is conducted. The calculation results indicate that the structured mesh movement algorithm is suitable for the dynamic characteristics investigation of water-lubricated journal bearings. And the comparative study shows that there is a considerable difference between the linear and nonlinear hydrodynamic forces of MGWJBs. Further investigation should be carried to evaluate the dynamic responses of rotor supported by MGWJBs under difference force models.

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“…In general, the cross stiffness or cross damping coefficients are much smaller than the diagonal coefficients. 23 Therefore, only the diagonal stiffness and damping coefficients are taken into account in this work.…”

Section: Bearing Reactionmentioning

confidence: 99%

The coupled effect of bearing misalignment and friction on vibration characteristics of a propulsion shafting system

Qin

Zheng

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part M:

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The propulsion shafting system of ships is usually supported, in part, by water-lubricated rubber bearings, which often work at mixed or boundary lubrication state under heavy-load and low-speed conditions, resulting in strong friction on the bearing-shaft interface and even abnormal vibration in the overall system. In addition, bearing misalignment can further affect the distribution of friction and consequently change the lateral and torsional vibration characteristics of the shafting system. In this work, the rubber bearing was simplified into parallel-distributed springs and the water film was neglected. The dynamic model of the propulsion shafting system was built with the finite element method and reduced by mode truncation. The coupled effect of bearing misalignment and friction was subsequently analyzed with this reduced model and the fourth-order Runge-Kutta method. Finally, lateral and torsional vibration characteristics of the overall system under different bearing misalignment were obtained, which can be used in the identification or diagnosis of abnormal vibration induced by friction.

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Study on the stiffness and damping coefficients of water-lubricated rubber bearings with multiple grooves

Cited by 16 publications

References 8 publications

Study of dynamic coefficients of water film in marine stern tube bearing considering roughness and deformation

Study of dynamic coefficients of water film in marine stern tube bearing considering roughness and deformation

Dynamic characteristics of water-lubricated journal bearings

The coupled effect of bearing misalignment and friction on vibration characteristics of a propulsion shafting system

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