3 edition of Theoretical study of the steady-state performance of floating ring journal bearings found in the catalog.
Theoretical study of the steady-state performance of floating ring journal bearings
David Michael Clarke
Written in English
|Statement||David Michael Clarke.|
The steady state performance of the counter rotating floating ring Journal bearing is analyzed with isothermal finite bearing theory. The effect of different parameters affecting the performance of the bearing (namely speed ratio, clearance ratio and radii ratio), have been investigated. The load carrying. American Journal of Engineering Research (AJER) Fig. 2 Basic types of oil-film JBs (a) conventional JB, (b) semi FRB, and (c) full FRB Research Background Floating-ring bearings .
Performance characteristics of a finite noncircular cylindrical floating ring bearing has been studied in terms of the inner and outer film eccentricity ratio, Sommerfeld number, attitude angle, stiffness and damping coefficients, equivalent support stiffness coefficient, whirl frequency ratio, and critical journal mass at various values of the outer film eccentricity ratios. Steady State Performance of Offset Halves Bearing Dr Ibrahem Ass. Prof Dept. of Mech. Eng. College of Eng. University of Tikrit Abstract In this research a theoretical study was presented to find the performance of the offset halves bearing which used in applications of.
American Journal of Engineering Research (AJER) w w w. a j e r. o r g Page II. PREVIOUS CONTRIBUTIONS Floating-ring bearing (FRB) is a hydrodynamic bearing having a cylindrical metal ring (floating-ring) which is loosely fitted between the journal and the bearing housing. The ring becomes fluid borne on spinning. Bearings in turbomachinery need to cope with these aspects, preferably during a long, safe, and silent lifetime with as few friction losses as possible. Several types of bearings have been developed to this end, such as tilting pad bearings, foil bearings, multilobe bearings, floating ring bearings, and even magnetic bearings.
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The performance characteristics and design data for journal bearings with a precise floating ring inserted between the rotating journal and a rigid housing are investigated theoretically. Based on convenient boundary conditions, a theory has been developed to predict the floating ring by: One purpose of the work was to calculate and experimentally verify steady-state and dynamic design data for two journal bearings, namely, the tilting-pad and full floating ring bearings.
The design data cover operation in both laminar and turbulent flow regimes with incompressible lubricants. The performance of floating-ring journal bearings with nonstationary load is analyzed. The main bearings of a S 4-stroke diesel engine are replaced by floating-ring bearings and an experiment.
A steady-state analysis based on the short bearing approximation is presented for the cylindrical-spherical floating ring bearing, where the inner surface of the ring is cylindrical whilst the outer is spherical.
Performance characteristics are compared with Li and Rohde’s theoretical work on the conventional cylindrical-cylindrical by: 4. An analysis of the steady state and dynamic characteristics of floating ring journal bearings has been performed.
The stability characteristics of the bearing, based on linear theory, are given. The transient problem, in which the equations of motion for the bearing system are integrated in real time was by: Calculated data on steady-state and dynamic properties of the plain cylindrical floating-ring bearing with pressurized lubricant supply are given.
The data are for a bearing with L/D of 1, and values of the ratio of inner to outer film clearances of and One value of.
A new modified Reynolds equation is derived with centrifugal force acting on the hydrodynamic oil film being considered. This equation, together with a cavitation model, is used to obtain the steady-state equilibrium and calculate the rotordynamic coefficients of lightly loaded floating bush journal bearings operating at very high shaft speeds.
A comprehensive analysis has been performed for floating bearings applied in a turbocharger. It is found that Couette power loss for a full-floating bearing (the floating ring rotates) decreases. A commentary has been published: Closure to “Discussion of ‘On The Steady State and Dynamic Performance Characteristics of Floating Ring Bearings’” (, ASME J.
Lubr. Technol.,p. ) This is a commentary to: On The Steady State and Dynamic Performance Characteristics of Floating Ring. theoretical and experimental steady-state and dynamic properties. Steady-state performance characteristics are evaluated.
of the Floating-Ring Journal Bearing, ” ASME J. Lubr. T echnol. In this study, a novel concept of a floating-ring bearing with three-lobed clearances in its inner and outer films is modelled.
In order to perform transient simulations, a very time-efficient approximate solution for the Reynolds equation to the geometry of three-lobed bearings is presented. Tilting pads, floating ring and non-circular journal bearings are more efficient than conventional circular journal bearings over a wide speed range, and these are adaptable to changes in operating speed.
Mu et al. suggested an actively controlled system with a movable conical damper ring. floating bearings the floating ring speed does not increase further, they illustrated that the speed ratio is less at low pressure floating ring bearings compared to typical oil pressure.
San Andres and Kerth  explained the effect of temperature on the performance of the floating ring bearings. In a steady state, the rotor, the air film, and the MR reach a mechanical equilibrium. Furthermore, the geometric coordinate relationship among the eccentricity of journal e j, the floating ring e b, and the floating ring relative to journal e is also established.
Hence, the construction of the mechanical model is the basis for the pressure. In oil and gas drilling, the roller-cone bit and the hybrid bit configured with roller cones are two commonly used rock-breaking tools; however, service lives of the bits are limited by the sliding bearings therein.
In order to improve the performance and reliability of the bearing in the roller cone, a novel bearing with a floating sleeve is researched in this paper.
ring journal bearings. It is theoretically confirmed that floating ring journal bearings can be used in counter rotating journal bearings. Andres and Kerth () studied the thermal effect on the performance of the floating ring journal bearing for turbochargers application.
It was found that the. Full-floating ring bearings exhibit a highly nonlinear stiffness and damping behavior, which give rise to a complex stability and bifurcation behavior -. To compute the stiffness and damping characteristic of these bearings, the pressure field has to be calculated in the inner and outer oil gap of the floating rings.
Measured and Predicted Friction In Floating-Ring Bearings. and geometries and study the effect of coupled journal and thrust journal bearing. Steady state performance characteristics such.
At the present time, a theoretical method for prediction of bearing performance in the fully turbulent flow regime has been published by Ng and Pan (Ref.
Prior to the present investigation, however, there had been no theoretical analyses of bearing performance in the region of vortex flow. The floating ring bearing system performance parameters are calculated by a numerical simulation program.
The pressure distributions in the outer and inner fluid film are determined by solving a two-dimensional (2D) extended and generalized Reynolds equation [14, 15] considering the effective hydrodynamic angular velocity for each individual film.A mass conserving cavitation model based on.
Hatakenaka et al. proposed a theoretical analysis of floating ring bush journal bearing with axial oil film rupture being considered. some earlier works proposed the stability analysis of turbocharger rotor bearing system and influence of the temperature on the stability also discussed with numerical and experimental analysis.
LI C H, ROHDE S M. On the steady state and dynamic performance characteristics of floating ring bearings[J]. Journal of Lubrication Technology-Transactions of the ASME,– CrossRef Google Scholar.American Journal of Engineering Research (AJER) w w w.
a j e r. o r g Page Fig. 2 Basic types of oil-film JBs (a) conventional JB, (b) semi FRB, and (c) full FRB Research Background Floating-ring bearings (FRBs) force coefficients are functions of bearing geometry, rotor motions.