The effect of misalignment on performance characteristics of engine main crankshaft bearings

Lahmar, Mustapha; Frihi, Djamel; Nicolas, D.

doi:10.1016/s0997-7538(01)01202-5

Cited by 35 publications

(18 citation statements)

References 7 publications

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“…The inclined rotor will cause a smaller minimum film thickness, higher maximum pressure, and different load capacity when compared with those of the aligned one. 23 Therefore, the misalignment effects must be taken into account when calculating performance characteristics for journal bearings.…”

Section: Theoretical Analysismentioning

confidence: 99%

Influence of dissimilar radial clearances on the performance of hydrodynamic rotor-bearing systems considering misalignment effects

Cao

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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Influence of dissimilar radial clearances of the two end bearings on the performance of hydrodynamic rotor-bearing systems is investigated in the present paper. The rotor misalignment effects are considered. A parameter ξ is introduced to measure the dissimilar level and three typical applied points ( Case Left, Case Center, and Case Right) of external load are also investigated during the analysis. Finite difference method is adopted to solve the Reynolds-type equation and verification of the solution technique is conducted by comparison with previous work. The rotor equilibrium postures are solved at different dissimilar parameters ( ξ) for the three external loading situations. Results show that dissimilar radial clearances have significant effects on rotor postures, minimum film thickness, stiffness and damping coefficients. Under unbalanced load situations ( Case Right, Case Left), small values of ξ (<1.0) will alleviate and large one ξ (>1.0) will aggravate the misaligned effects. Meanwhile, the minimum film thickness increases with ξ (<1.0) and decreases with ξ (>1.0). For stiffness and damping coefficients, the variations with ξ have no obvious rules. During the design and analysis of hydrodynamic rotor-bearing systems, the dissimilarity should be considered intensively for reaching appropriate results.

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Section: Theoretical Analysismentioning

confidence: 99%

Influence of dissimilar radial clearances on the performance of hydrodynamic rotor-bearing systems considering misalignment effects

Cao

et al. 2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…His formulation can be used for various type of bearing configurations and grooves. Lahmar et al [108] in 2002 analyzed the effect of journal misalignment on the hydrodynamic performance of a main crankshaft bearing with mobility method of Booker [109]. They showed that for small misalignment of the main journal, the minimum film thickness and the journal center trajectories differ greatly from that of an aligned journal.…”

Section: Dynamic Loading and Engine Bearingsmentioning

confidence: 99%

On the Characteristics of Misaligned Journal Bearings

Jang

Khonsari

2015

Lubricants

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Journal bearing misalignment arise generally from the shaft deformation under load, deflection of the shaft, manufacturing and assembly errors, improper installation, and asymmetric loading. During operations, misalignment has a considerable effect on the static and dynamic performances. It could cause wear, vibration and even system failure. In this article, a literature review of misalignment of the journal bearings is presented. The basic theory for the misalignment and some results for the circular journal bearing are also presented to show the general trends of the misalignment.

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“…Moreover, Lahmar et al. 16 obtained the misalignment effect on the journal centre trajectories. Ebrat et al.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the characteristics of aerostatic journal bearings considering misalignment under pure-static and hybrid condition

Zhang

Zou

2018

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this paper, the steady-state characteristics, including film pressure, load capacity, stiffness, misalignment moment of aerostatic bearings considering two types of misalignment (along vertical direction [Formula: see text] and along horizontal direction [Formula: see text]) are studied under pure-static and hybrid condition. The journal misalignment effects on the steady-state characteristics under pure-static condition and hybrid condition are studied comparatively. The results show that the load capacity and stiffness increase with the increase in the degree of journal misalignment under hybrid condition, while they decrease with the increase in the degree of journal misalignment under pure-static condition. Moreover, the journal misalignment along two perpendicular direction effects on the performances of aerostatic bearings are also investigated comparatively and the performances of bearing are found to be more sensitive to the misalignment along horizontal direction.

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The effect of misalignment on performance characteristics of engine main crankshaft bearings

Cited by 35 publications

References 7 publications

Influence of dissimilar radial clearances on the performance of hydrodynamic rotor-bearing systems considering misalignment effects

Influence of dissimilar radial clearances on the performance of hydrodynamic rotor-bearing systems considering misalignment effects

On the Characteristics of Misaligned Journal Bearings

Comparison of the characteristics of aerostatic journal bearings considering misalignment under pure-static and hybrid condition

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