Comprehensive analysis of fluid-film instability in journal bearings with mechanically indented textures

Smolík, Luboš; Rendl, Jan; Omasta, Milan; Byrtus, Miroslav; Šperka, Petr; Polach, Pavel; Hartl, Martin; Hajžman, Michal

doi:10.1016/j.jsv.2022.117454

Cited by 8 publications

(4 citation statements)

References 42 publications

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“…The rotor is subjected to hydrodynamic forces, out-of-balance forces, and gravitational force. The motion of the rotor can be expressed, for instance, as shown by Smolík et al (2023), by the equations…”

Section: Equations Of Motionmentioning

confidence: 99%

Investigation of the Effect of Surface Texturing in Hydrodynamic Sliding Contacts

Polach,

Smolík,

Byrtus

et al. 2024

Engineering Mechanics

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Hydrodynamic lubrication is an effective method for connecting various relatively moving structural components in engines, rotors, manipulators, and other systems. Surface texturing can enhance the performance of such contacts. Initially, a theoretical framework for modeling textured surfaces of journal bearings is introduced, which is then employed to analyze the dynamic behavior of rotors. Additionally, a pinon-disc approach for determining the properties of a lubricated textured surface is presented. The objective of utilizing the pin-on-disc method is to enhance computational models of lubricated textured pins by comparing experimental measurements with numerical simulation results. The knowledge gained can be applied to optimize parameters in computational models of hydrodynamic contact for textured surfaces in various applications, such as the model presented for journal bearings.

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Section: Equations Of Motionmentioning

confidence: 99%

Investigation of the Effect of Surface Texturing in Hydrodynamic Sliding Contacts

Polach,

Smolík,

Byrtus

et al. 2024

Engineering Mechanics

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“…Due to the presence of multiple flexible bodies and nonlinear couplings in the assembly, its motion is described using the Newton-Euler equations for multi-body dynamics. The whole model was created in the AVL Excite software and numerically solved in order to verify the suitability of the bearing design with respect to instabilities, see Smolík et al (2022).…”

Section: Vertical Rotor Immersed In Hot Fluidmentioning

confidence: 99%

Dynamics of Rotating Systems Focused on Industrial Applications

Hajžman,

Bulín,

Byrtus

et al. 2024

Engineering Mechanics

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This paper introduces the specific issues of dynamic behaviour and the possibilities of computational modelling in rotating systems. Initially, it revisits the basic properties of rotating systems supported by journal bearings. Subsequently, it explores the instabilities associated with various types of journal bearings. Three intriguing industrial applications are then presented. The first application explores the nonlinear dynamics of high-speed turbochargers, focusing on their specific floating ring bearings. Computational results are compared with experimentally obtained data for validation. Conversely, the second application concerns the dynamics of large turbine rotors used in power plants. Particular attention is given to addressing challenges related to stator and foundation considerations in computational models. Lastly, the third application aims to model a specific vertical rotor immersed in fluid and operating under extreme temperatures.

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“…Singh and Awasthi [20] found that using the optim and aspect ratio could increase the stability apparently. However, it should for the available researches, the stiffness and damping coefficients being su the dynamic rotor equations are solved by the laminar Reynolds equations Recently, some researchers carried out experimental investigations o texture on the stability of bearing-rotor systems [14,[21][22][23] and proved tha of the water-lubricated bearing-rotor system could be apparently reduced design of the texture. However, a comprehensive numerical study to explore how textures aff ity and unbalance response of the WLHB rotor system based on Navier-St considering cavitation, turbulence and inertia has not been undertaken.…”

Section: Mathematical Models 21 Governing Equationsmentioning

confidence: 99%

“…Recently, some researchers carried out experimental investigations on the effect of texture on the stability of bearing-rotor systems [14,[21][22][23] and proved that the vibration of the water-lubricated bearing-rotor system could be apparently reduced by reasonable design of the texture. However, a comprehensive numerical study to explore how textures affect the stability and unbalance response of the WLHB rotor system based on Navier-Stokes equation considering cavitation, turbulence and inertia has not been undertaken.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System

et al. 2023

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This paper aims to investigate the combined effects of working condition and structural parameters of groove texture on the dynamic characteristics, stability and unbalance response of a water-lubricated hydrodynamic bearing–rotor system to avoid instability and excessive vibration of the rotor. The Navier–Stokes equation, standard K-ε model with enhanced wall treatment and Zwart–Gerber–Belamri cavitation model are considered using the commercial software Fluent to calculate the stiffness and damping coefficients of a groove-textured, water-lubricated bearing based on the dynamic mesh method; the critical mass to express the stability and the unbalance response solved by the fourth order Runge–Kutta method of the rotor are calculated based on dynamic equations. The results indicate that shallower and longer groove textures can improve the direct stiffness along the load direction kyy, weaken the stiffness in the orthogonal direction kxx, improve stability and decrease the unbalance response amplitude of the water-lubricated bearing–rotor system at a greater rotational speed and smaller eccentricity ratio; however, the impact of grooves on damping parameters is not as great as it is on stiffness—there exists an optimum groove width to achieve a best dynamic performance.

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Comprehensive analysis of fluid-film instability in journal bearings with mechanically indented textures

Cited by 8 publications

References 42 publications

Investigation of the Effect of Surface Texturing in Hydrodynamic Sliding Contacts

Investigation of the Effect of Surface Texturing in Hydrodynamic Sliding Contacts

Dynamics of Rotating Systems Focused on Industrial Applications

A Numerical Investigation of the Effects of Groove Texture on the Dynamics of a Water-Lubricated Bearing–Rotor System

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