Dynamic Characterization and Stability Analysis of Hydrodynamic Journal Bearing Using the Fem

Boukhelef, Dj.; Bounif, Abdelhamid; Bouzid, Dj. Amar

doi:10.5755/j01.mech.17.5.727

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…Papadopoulos et al [17] investigated the stability limits of the bearings, considering the effect of misalignment. Boukhelef et al [18] used the finite element method to calculate the dynamic and static characteristics as well as the stability of journal bearings. Nicoletti [19] used an optimization method to find bearing profiles that ensure better stability margins of rotor-bearing systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Performance of Chamfered Finite-Length Journal Bearings under Dynamic Loads

et al. 2023

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Misalignment is one of the most common challenges that the normal operation of journal bearings faces. This type of problem may be the result of a wide range of reasons, such as bearing wear, shaft deformation, and errors related to the manufacturing and installation process. The main undesirable consequences of the misalignment, such as pressure rise and lubricant film reduction, are concentrated on the bearing edges. Therefore, chamfering the bearing edges reduces such misalignment-related drawbacks. This work presents a novel numerical solution to the problem of finite-length journal bearing considering edge chamfering. This solution involves the determination of the levels of lubricant layer thickness and pressure distribution in addition to the journal trajectory under impact load with the related stability limits. The finite difference method is used in this solution, and the equations of motion are also solved numerically using the Runge–Kutta method. The Results of this novel analysis show that chamfering the bearing edges increases the film thickness and reduces pressure spikes associated with the system operation under the case of 3D misalignment. Furthermore, the chamfered bearing shows a wide stability range under impact loads, where the normal bearing is unstable as the critical speed increases by 26.98%, which has positive consequences on the journal’s trajectory.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Performance of Chamfered Finite-Length Journal Bearings under Dynamic Loads

et al. 2023

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“…Qiu and Tieu [22,23] and Abass et al [24] solved numerically, based on the finite difference method, the problem of misaligned journal bearing without considering bearing modification under dynamic load. The stability limit of journal bearing was also investigated by Papadopoulos et al [25] and Boukhelef et al [26] with an attempt by Nicoletti, 2013 [27] to find the bearing profiles that improve the stability of the rotor bearing system based on an optimization method. Mehrjardi et al [28] used the fourth-order Runge-Kutta method in analyzing the stability of journal bearing, and their result showed that bearing noncircularity can improve the stability of the system.…”

Section: Introductionmentioning

confidence: 99%

Effect of Chamfer Form and Parameters on the Characteristics of Finite Length Journal Bearing under Impact Load

et al. 2023

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Journal bearings in typical applications are subjected to misalignment due to several causes, such as shaft deformation under load and errors related to the installation and manufacturing processes. Misalignment has well-known severe negative consequences on the performance of the bearings. This paper deals with the bearing chamfer to reduce these consequences of misalignment, and two forms of bearing edge modification are considered in the analysis. These forms are linear and curved chamfering of the bearing edges, where the height of the chamfer in the circumferential direction and the length of the modification in the longitudinal direction are considered as geometrical design parameters. The investigation includes a numerical solution of the hydrodynamic lubrication problem of finite length journal bearing, considering 3D misalignment cases using the finite difference method. This includes the assessment of the chamfer forms and their effects on the bearing performance in terms of the main bearing design parameters. Furthermore, the stability of the chamfered bearings is also investigated under impact load. Results showed that both chamfer forms are beneficial for a certain limit of the design parameters in reducing the maximum pressure and coefficient of friction and in elevating the film thickness levels, extending the range of misalignment in which the journal bearing can operate safely. In addition, the chamfered bearings in both forms showed more stability range in terms of the critical speed and shaft center trajectories under impact load. The bearings with the curved chamfer, where the slope is continuous at the start of modification, showed more uniform film thickness levels, and their shaft center trajectories were closer to the perfectly aligned bearing in the stable operating range of the system.

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“…Results are presented in terms of the journal centre trajectory at constant speed for various Reynolds number and Sommerfeld number. Boukhelef et al (2011) had done dynamic characterization and stability analysis of hydrodynamic bearing using FEM technique. They concluded that stability margin is decreases with increase in slenderness ratio (L/D).…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Twin Axial Groove Hybrid Journal Bearing

Dwivedi

Chand²,

Pandey

2016

JAFM

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Stability of rigid rotor supported on hybrid journal bearing with twin axial groove has been investigated using stiffness and damping coefficients of the bearings. In this paper the stability analysis of twin axial groove bearing is determined in different fluid flow regime. Non linear journal centre trajectories are drawn for small amplitude oscillations of the journal centre about its steady state position. It was observed that turbulence decreases 10 to 12 percent the stability margin of twin grooved journal bearings.

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Dynamic Characterization and Stability Analysis of Hydrodynamic Journal Bearing Using the Fem

Cited by 5 publications

References 11 publications

Analysis of the Performance of Chamfered Finite-Length Journal Bearings under Dynamic Loads

Analysis of the Performance of Chamfered Finite-Length Journal Bearings under Dynamic Loads

Effect of Chamfer Form and Parameters on the Characteristics of Finite Length Journal Bearing under Impact Load

Stability Analysis of Twin Axial Groove Hybrid Journal Bearing

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