Optimum geometrical design of multipad externally pressurized journal bearings

Michelini, Rinaldo C.; Ghigliazza, R.

doi:10.1007/bf02186942

Cited by 10 publications

(2 citation statements)

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“…Substitution of equations (7) and (8) into the equation 1and retaining the first linear terms, gives the three differential equations in…”

Section: Dynamic Characteristicsmentioning

confidence: 99%

“…The friction characteristics of externally pressurised bearings are investigated in [7] over a complete range of operating bearing conditions. Geometrical characterizations of externally pressurized journal bearing have been defined [8]. Falkehagen et al [9] investigated the stability characteristics and transient motion of a finite width three-lobe bearing for a wide range of ellipticity ratio and offset factor.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Axial Groove on Steady State and Stability Characteristics of Finite Two-Lobe Hybrid Journal Bearing

2015

J Appl Mech Eng

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The study of the steady state and stability characteristics including whirl instability of finite two-lobe hybrid journal bearing with an axial groove, located at the top from which oil is supplied at a constant pressure is obtained theoretically. The two lobes of 1600 arc each are separated by two axial oil groove of 20° circumferential extensions in the horizontal direction. A two-dimensional finite difference solution was used to predict the performance of finite length externally pressurized two-lobe hydrodynamic hybrid journal bearings.The Reynolds equation is solved numerically using finite difference method satisfying the appropriate boundary conditions to obtain the effect of speed parameter on bearing performance.The stability characteristics were found out using first-order perturbation method. With the change of speed Stiffness and damping coefficients behaviour was determined at various eccentricity ratios. The bearing load-carrying capacity, stiffness, lubricant flow rate, attitude angle and frictional torque due to bearing rotation increase with increase in eccentricity ratio and speed. A comparison is also made with plain cylindrical axial grooved journal bearing. It is found that externally pressurized two-lobe hybrid bearing is more superior to plain cylindrical axial-grooved oil journal bearing in terms of load capacity, improved end flow, friction losses and stability. The bearing is generally stable at high values of the eccentricity ratio and speed parameter. Journal of Applied Mechanical Engineering J ou rnal of A p p li e d Me cha n ic a l E n gi neerin g

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“…Substitution of equations (7) and (8) into the equation 1and retaining the first linear terms, gives the three differential equations in…”

Section: Dynamic Characteristicsmentioning

confidence: 99%