Design Data for Three-Lobe Bearings

Malik, M.; Sinhasan, R.; Chandra, Mahesh

doi:10.1080/05698198108983031

Cited by 51 publications

(57 citation statements)

References 7 publications

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“…Rahmatabadi et al [6] studied bearings lubricated with micropolar fluids using finite element method. The results revealed that the static performance characteristics are enhanced significantly with the use of micropolar fluids as lubricants and are found to be p larger coupling numbers.…”

Section: Multilobe Bearingsmentioning

confidence: 99%

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

Murthy

Raghunandana

2019

IJMPERD

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In recent years, applications of non-Newtonian fluids as lubricants have received great interest since the use of these non-Newtonian lubricants showed an increase in load carrying capacity and reduction in frictional force with the escalation in additives concentration. The demands of the present day industry rotating machinery includes high speed, compactness, light weight engines, high operating loads, high power transmission, high efficiency, and high performance of the engine. As a result of high speed machines, bearings are inclined to have excessive power loss and increasein oil temperature. The former reduces the efficiency of the engine and the latter causes the undesired changes in the lubricating oil. The plain journal bearings at high rotation speeds are subjected to instability like oil whirl and whip ruining the bearing and also the machine. Therefore, this poses a need to change in the bearing design. In the present paper, an attempt is made to briefly introduce the various non-linear models used and the different approaches that have been carried out by the researches in the past few years to improve and achieve the stability of journal bearing along with enhanced performances and characteristics.

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Section: Multilobe Bearingsmentioning

confidence: 99%

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

Murthy

Raghunandana

2019

IJMPERD

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“…10 The horizontal to vertical load ratio less than 0.00001 is assumed as a condition for ending the iteration loops. For cavitated lobes, the Reynolds boundary condition which represents the continuity of lubricant flow so that the flow at n 2 be totally velocity induced 6 is used. So an iteration procedure is applied to minimize d " P n =d at n 2 while the ratio of pressureinduced flow to velocity-induced flow should be smaller than 0.001.…”

Section: Numerical Analysismentioning

confidence: 99%

“…Steady-state performance analysis has been the subject of primary researches in the field of incompressible fluid film lubrication of circular and noncircular journal bearings. Malik et al 5,6 presented a comparative investigation of some two and three lobe noncircular bearing configurations for the laminar and turbulent lubrication regime. Their results indicate that noncircular bearings with different geometry have various circumferential pressure distributions and can have different steady-state performance parameters.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of the preload effects on the stability performance of noncircular journal bearings using linear and nonlinear dynamic approaches

Mehrjardi

Rahmatabadi

Meybodi

2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this work, the effects of preload factor on the stability performance of noncircular two and three lobe journal bearings with incompressible micropolar lubricant are presented based on the linear and nonlinear dynamic models. Assuming that the rotor is rigid, the governing Reynolds equation for the hydrodynamic lubrication of finite length lobed journal bearings has been modified using micropolar theory. Then, the linear and nonlinear dynamic models which include a certain harmonic disturbance and a time dependent trajectory of rotor center are applied to analyze the stability performance of the considered bearings. The generalized differential quadrature method and fourth-order Runge–Kutta technique have been used to solve the governing Reynolds equation and time-dependent dynamic equations of rotor motion, respectively. Finally, the numerical results for the critical mass parameter and the whirl frequency ratio of the rotor as the stability characteristics of the lobed bearings are obtained for different values of preload factor and are compared together. Results show that the dynamic stability of the noncircular bearings is enhanced by decreasing the preload factor i.e. increasing the amount of bearing noncircularity. These enhancements are in terms of increase of the critical mass parameter and decrease for the whirl frequency ratio. Also, by comparing the two dynamic analysis methods, it is seen that the results of linear model are more conservative in different investigated cases. The results of nonlinear analysis reveal that by changing the preload factor the dynamic responses of the lobed bearings appear in different manners. From the responses, it is observed that the type of dynamic trajectory of rotor center varies from stable fixed point to limit cycle periodic motions and also contact between rotor and bearing’s shell.

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“…Ma and Taylor [12] developed a computerized code to study static performance characteristics of five different configurations of non-circular bearings and pointed out that the increase in the angular size of an oil groove improves the static performance of multilobe bearings. Malik et al [13,14] implemented a computer program to develop design data of static and dynamic characteristics for three lobe bearing with preload factor 0.5, operating in laminar as well as turbulent regimes for various aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

Numerical analysis of three lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation

Dhande

Pande

Lanjewar

2018

J Braz. Soc. Mech. Sci. Eng.

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This work is continuation of the earlier work published on an analysis of plain cylindrical journal bearing using CFD-FSI technique. Here, the technique is applied to analyse three lobe journal bearing. The numerical simulations were carried out using ANSYS WorkbenchÒ software. The hydrodynamic pressures were computed using computational fluid dynamics (CFD), and structural deformations were estimated using structural module. The fluid pressure forces and displacements were transferred via inbuilt transfer interface available in the software. The optimization of the journal bearing position was carried out based on response surface optimization. The numerical results were compared with experimental results which were available in the literature, and a good agreement was found. The proposed numerical method was implemented to study the pressure distribution in three lobe journal bearing considered for study at three eccentricity ratios 0.25, 0.6 and 0.75 for various speeds ranging from 1000 to 4000 RPM in order to study effect of eccentricity ratio and speed on static pressure distribution in the bearing. Preload factor of 0.5 was considered for the study. The results were compared with a set of experimental data obtained on a test rig developed by the authors. The uncertainty analysis of the experimental results was also carried out, and all the results were found in expected range of pressure.

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Design Data for Three-Lobe Bearings

Cited by 51 publications

References 7 publications

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

A Technical Review on the Study of Stability Analysis of Non-Circular Bearings Lubricated with Newtonian/Non-Newtonian Fluids

A comparative study of the preload effects on the stability performance of noncircular journal bearings using linear and nonlinear dynamic approaches

Numerical analysis of three lobe hydrodynamic journal bearing using CFD–FSI technique based on response surface evaluation

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