Analysis of thermoelastohydrodynamic performance of journal misaligned engine main bearings

Bi, Fengrong; Shao, Kang; Liu, Changwen; Wang, Xia; Jian, Zhang

doi:10.3901/cjme.2015.0228.020

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…When the crankshaft axial movement is not considered, the minimum oil film thickness is reduced to varying degrees with considering the influence of the surface roughness compared with not considering surface roughness. 14,15 On the basis of considering the axial movement, the change trend and degree of minimum oil film thickness are significantly changed when considering the influence of surface roughness compared with not considering the surface roughness. The minimum oil film thickness of No.…”

Section: Resultsmentioning

confidence: 99%

“…Boedo, 11 Rao et al, 12 and Brito et al 13 analyzed the effects of the structural parameters of bearings on the lubricating property of misaligned journal bearing. Bi et al, 14 Sun et al, 15 and Lorenz et al 16 studied the lubrication performances of crankshaft bearings considering the influence of surface topography based on the average Reynolds equation, which found that the surface topography parameters had a substantial impact on bearing lubrication characteristics. You et al 17 compared the effects of the continuous beam crankshaft model and the simply supported beam crankshaft model on the crankshaft deformation, and pointed out that the former can more accurately reflect the dynamic response of the crankshaft bearing.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical study on lubrication performance of engine main bearing with rough surface considering axial movement of crankshaft

Sun

Zhu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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In actual operation of an engine, the crankshaft will move along the axis direction of engine main bearings under the combined influence of various influencing factors. Considering the axial movement and crankshaft deformation, a new lubrication model of engine main bearings with rough surface was built based on the average Reynolds equation. The influence of axial movement of deformed crankshaft on performance of main bearing with rough surface was studied. In this study, the axial movement law of deformed crankshaft is measured through experiment, and the finite element method was applied to solve the tilting of crankshaft in the bearing bore resulted from the crankshaft deformation. The results show that the axial movement of deformed crankshaft has a significant impact on performance of main bearing with rough surface. No matter whether or not the surface roughness is considered, the journal center trajectories of main bearings are unclosed three-dimensional space curve due to the axial movement of deformed crankshaft. The influence level of the axial movement of deformed crankshaft on lubrication characteristics of main bearings is directly related to the surface roughness. The influence trend and level of the surface roughness on lubrication characteristics of main bearings are obviously changed when considering the axial movement of crankshaft.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical study on lubrication performance of engine main bearing with rough surface considering axial movement of crankshaft

Sun

Zhu

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…Carrying the larger loading capacity of the magnetized journal bearings with a squeeze dynamic action such as in the internal combustion engine, the measure unit of oil-film thickness is usually expressed in micron, for the maximum oil-film pressure that is often bigger than the value of 10 MPa and the stiffness of the journal bearing (bearing block) is smaller due to its structure design limit. 1,2 According to this analysis, the effects of the elastic deformation of working surface have a great importance in the pressure distribution of the oil film and its loading capacity. For example, some papers 3,4 have reported that loading capacity of rigid journal bearing is bigger than that of journal bearing considering its materials elastic deformation.…”

Section: Introductionmentioning

confidence: 99%

The lubrication characteristics of magnetized journal bearings affected by magnetic fluids considering the elasticity of its liner

Maiti

et al. 2022

Advances in Mechanical Engineering

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In order to investigate the lubrication characteristics of journal bearings with the elasticity of liner affected by magnetic fluids, a theoretic computation model was developed based on magnetic fluids supporting force parameter ([Formula: see text]) and couple-stress factor ([Formula: see text]). The results indicate that maximum dimensionless pressure peak ([Formula: see text]) of oil-film increases with increase in magnetic fluids supporting force parameter ([Formula: see text]), couple-stress factor ([Formula: see text]) and with decrease in elastic deformation coefficient ( Ce) of the liner. The loading capacity ([Formula: see text]) increases with increase in [Formula: see text], [Formula: see text] and with decrease in Ce particularly in the high eccentricity ratio ( ε); The attitude angle ([Formula: see text]) of S with different [Formula: see text] and [Formula: see text] decreases in a small range of ε at first, and then increases, it increases with the decrease of [Formula: see text] and [Formula: see text], and with the increase of [Formula: see text], theses phenomena are more obvious for [Formula: see text] at low ε and for [Formula: see text] and [Formula: see text] at moderate and high ε; the modified coefficient of friction ([Formula: see text]) decreases with increase in [Formula: see text], [Formula: see text] and with decrease in Ce; the side leakage ( Q) decreases with increase in [Formula: see text], with decrease in [Formula: see text] and with increase in Ce particularly in the low ( ε). Moreover, the increase of elastic deformation coefficient ( Ce) weaken the impacts of [Formula: see text], [Formula: see text] on the increase of [Formula: see text], [Formula: see text],[Formula: see text], and the decrease of [Formula: see text], Q.

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“…In most studies, the rotational parts were considered as a whole in the rubbing system without considering the blade-disk structure and other parts of the rotor system. 1–4 But the blade-casing rubbing is more complex compared with the “rotor-stator rubbing” case because lots of nonlinear phenomena could appear in the former case. 5 Padovan and Choy 6 used a Jeffcott rotor with a cantilever beam blade to conduct a blade-casing fault model, and the influence of unbalance eccentricity and blade stiffness on the rotor dynamics were studied.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristics analysis of blade-casing rubbing faults with abradable coatings

Zhang

Lin

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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In this paper, a dynamic model of a “0-2-1” rotor system with rubbing fault between blade and abradable coated casings is developed. The sub-model of rubbing force considers scraping work energy of coating, casing stiffness, and initial clearance between blade tip and casing. A rotor rig is established and samples of abradable coatings are introduced into the rubbing experiment. Vibration characteristics of the rotor system under blade-casing rubbing fault are analyzed. Effects of rotating speed and initial clearance on the rub force and the system vibration are studied. Results show that the vibration of rotor focuses on the fundamental and multiple fundamental frequencies due to the blade-casing rubbing with the abradable coating. The multiple fundamental frequencies, the 2 × and 3 × in particular, are greatly affected by the rotating speed. The fractional harmonic frequencies are strongly influenced by the initial clearance between the blade tip and casing. Besides, the rotating speed and the initial clearance between the blade tip and abradable coating on the casing also affect the amplitude and distribution of the rub force.

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Analysis of thermoelastohydrodynamic performance of journal misaligned engine main bearings

Cited by 5 publications

References 17 publications

Numerical study on lubrication performance of engine main bearing with rough surface considering axial movement of crankshaft

Numerical study on lubrication performance of engine main bearing with rough surface considering axial movement of crankshaft

The lubrication characteristics of magnetized journal bearings affected by magnetic fluids considering the elasticity of its liner

Dynamic characteristics analysis of blade-casing rubbing faults with abradable coatings

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