Finite length floating ring bearings: Operational characteristics using analytical methods

Chasalevris, Athanasios

doi:10.1016/j.triboint.2015.10.016

Cited by 23 publications

(25 citation statements)

References 7 publications

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“…ey found that, with the rotation control mechanism configured with a special lubrication system, damping capacity of the bearing and dynamic performance of the rotor were significantly improved in the rotation speed of 10000 r/min [3]. Chasalevris conducted a research on the operating characteristics of the bearing under high-speed condition and put forward a precise analytic method for the bearing with cylindrical floating sleeve of finite length, of which the result was in good accordance with the numerical solution [4]. Guo et al researched the lubrication of the floating-sleeve bearing in a turbocharger under a high-speed and light-load condition and put forward a new method to lubricate the bearing by applying an external pressure, which successfully reduced the friction and improved the stability of the bearing [5].…”

Section: Introductionmentioning

confidence: 73%

Theoretical and Experimental Research on the Floating‐Sleeve Bearing Applied in Roller‐Cone Bit

Yang

Cheng³

2019

Shock and Vibration

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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. Firstly, motion characteristics of the bearing are researched, and motion relations between the elements in the bearing are analyzed, respectively. Then, on the basis of the motion relations, three motion statuses of the float sleeve are clarified, including the sleeve start to rotate, the sleeve rotates stably with the pushing force exerted by the rollers, and the sleeve rotates stably with the opposing force exerted by the rollers. At last, bearing performances in three different conditions are respectively tested in the experiment. The results, with the specific speed value being in the range of 0.375∼0.833 and the average value in 0.613∼0.618, show that the sleeves with 6∼12 rollers are able to start and rotate stably under 5 kN radial load, indicating that the sleeves can be started to rotate and work stably, whereas, for the sleeve with less than 4 rollers, the specific speed value varies in the large range of 0∼1.176, indicating that this sleeve cannot rotate stably in the bearing. This research revealed that the amount of rollers is an important factor that determines whether the sleeve is able to float stably in the bearing; therefore, roller quantity should be focused in the bearing design to optimize its performance.

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Section: Introductionmentioning

confidence: 73%

Theoretical and Experimental Research on the Floating‐Sleeve Bearing Applied in Roller‐Cone Bit

Yang

Cheng³

2019

Shock and Vibration

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“…Should the inner and outer films be of different length to diameter ratio 1/k, a different database should be calculated. This is the most applicable case in floating rings of automotive turbochargers [16,17].…”

Section: Application Of the Methods In Floating Ring Bearingsmentioning

confidence: 99%

“…Using the database method, a very precise prediction of the bearing performance, e.g., using CFD, can be implemented in a rotordynamic algorithm as fast as a simple solution, e.g., short bearing approximation.The paper considers two rotordynamic design applications of the database method. The extended database method is developed for simple floating ring bearing models [16] and it is applied to a simple high-speed system of an automotive turbocharger, considering rigid rotor [17]. The evaluation time for Lubricants 2019, 7, 78 3 of 28 a rotor run-up and the respective optimization problem described in the paper is drastically reduced when Database Method is applied.…”

mentioning

confidence: 99%

“…The interpolated values for F x , F y , T 1 , T 2 are then evaluated in Equation (16). For F y,i used in Equation (16), Equation (15) should be written for the values dat(. .…”

mentioning

confidence: 99%

“…x FOR PEER REVIEW 10 of (a) Definition of the geometry and parameters of operation used in the analysis of a plain cylindrical floating ring bearing, and (b) Representation of the forces and moments acting at the floating ring[16].…”

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confidence: 99%

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Evaluation of Transient Response of Turbochargers and Turbines Using Database Method for the Nonlinear Forces of Journal Bearings

Chasalevris

Louis

2019

Lubricants

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The paper extents the fluid film bearing database method to arbitrary fixed bearing profiles including floating ring bearings. The method is applied to evaluate rotordynamic response of an automotive turbocharger, modeled as rigid rotor, and of a turbine-generator shaft train for power generation modeled as flexible rotor through the transient transfer matrix method. The methodology claims to render drastically faster evaluation of transient response of rotating systems with nonlinear bearings regardless the complexity of the bearing models implemented. The computational time of transient response is similar to this when short bearing expressions are used. Turbocharger rotordynamic simulation considers the use of nonlinear bearing models as mandatory, and several case studies have to be performed for the definition of key design parameters of floating ring bearings. The bearing database method offers the tool for a severe total time reduction in rotordynamic calculations, with the possibility to implement advanced thermohydrodynamic bearing models to the rotordynamic algorithm as fast as short bearing approximation formulas. Furthermore, the rotordynamic design of large turbine shaft trains is still based on linear harmonic analysis which leads to conservative designs. The database method aims to include the transient response of nonlinear rotor models as a standard procedure in the rotordynamic design of large shaft trains, which nowadays is avoided due to high time cost and complexity.

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2021

Bearing Dynamic Coefficients in Rotordynamics

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Finite length floating ring bearings: Operational characteristics using analytical methods

Cited by 23 publications

References 7 publications

Theoretical and Experimental Research on the Floating‐Sleeve Bearing Applied in Roller‐Cone Bit

Theoretical and Experimental Research on the Floating‐Sleeve Bearing Applied in Roller‐Cone Bit

Evaluation of Transient Response of Turbochargers and Turbines Using Database Method for the Nonlinear Forces of Journal Bearings

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