Engineering Optimum Design of Fluid-Film Lubricated Bearings

Wang, Nenzi; Ho, Chang-Li; Cha, Kuo-Chiang

doi:10.1080/10402000008982353

Cited by 35 publications

(15 citation statements)

References 9 publications

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“…For example, a solution successfully applied to a bearing instability may not work for a seal fluid instability, perhaps because seals cannot be grooved. Other techniques [11,12] have been reported as improving the stability of journal bearings.…”

Section: Introductionmentioning

confidence: 98%

The Effect of Disk Location, Shaft Length and Imbalance on Fluid Induced Rotor Vibrations

Sunar

Al-Shurafa

2011

Arab J Sci Eng

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Rotors mounted on fluid film bearings can experience fluid induced instabilities that manifest as severe vibration. The setup of the fluid film bearing greatly contributes to the dynamic characteristics of these systems. In this paper, the influence on fluid induced rotor vibrations of shaft length, disk axial separation distance from the fluid film bearing and disk imbalance are studied through experiment and simulation. The basic components of the rotor are the shaft, a disk with variable imbalance, a sleeve and a fluid film bearing. Experimental shaft vibration data was collected and analyzed by computer. The finite element method was used to model the shaft, disk and bearings. The stiffness and damping maps and Campbell diagrams for the system were produced and used to analyze stability. Results indicate that increasing the distance of the disk from the fluid film bearing increases the instability threshold, whereas increasing the shaft length decreases the instability threshold. Changes in shaft length and disk location do not result in noticeable effects on the instability amplitude. Although the mass imbalance produces vibrations in same order as the frequency of shaft rotation, it also affects the oil instability at a frequency of about half that of the shaft rotation.

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Section: Introductionmentioning

confidence: 98%

The Effect of Disk Location, Shaft Length and Imbalance on Fluid Induced Rotor Vibrations

Sunar

Al-Shurafa

2011

Arab J Sci Eng

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“…Each of the iterations involves at least one evaluation of the objective function, and in some cases, of their first derivatives. In the optimization analyses used for tribological applications [1,[6][7][8][9], many of those are difficult to parallelize in the level of search scheme. For instance, if the search in an optimization process is guided by the optimum determined from previous search points, such as gradient search methods or simplex method, the computation is difficult to execute in parallel.…”

Section: Introductionmentioning

confidence: 99%

A parallel computing application of the genetic algorithm for lubrication optimization

Wang

2005

Tribol Lett

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This study investigated the performance of parallel optimization by means of a genetic algorithm (GA) for lubrication analysis. An air-bearing design was used as the illustrated example and the parallel computation was conducted in a single system image (SSI) cluster, a system of loosely network-connected desktop computers. The main advantages of using GAs as optimization tools are for multi-objective optimization, and high probability of achieving global optimum in a complex problem. To prevent a premature convergence in the early stage of evolution for multi-objective optimization, the Pareto optimality was used as an effective criterion in offspring selections. Since the execution of the genetic algorithm (GA) in search of optimum is population-based, the computations can be performed in parallel. In the cases of uneven computational loads a simple dynamic load-balancing scheme is proposed for optimizing the parallel efficiency. It is demonstrated that the huge amount of computing demand of the GA for complex multi-objective optimization problems can be effectively dealt with by parallel computing in an SSI cluster.

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“…Swanson 14 determined an optimum clearance confi guration, which minimised the maximum value of whirl ratio. Wang et al 15 optimised the design of an elliptical bearing with a load angle orientation of 30 degrees, which maximised the fi lm pressure in the two lobes. However, this paper attempts to fulfi l the gap in the literature with regard to the rotor dynamic characteristics and stability of short wavy journal bearings.…”

Section: Introductionmentioning

confidence: 99%

Static and dynamic characteristics of short wavy journal bearings

Meena

Gautam

Ghosh

2010

Lubrication Science

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A general analysis has been done to investigate the static and dynamic performance of short wavy journal bearing. Reynolds equation is solved for both steady-and unsteady-state operations. The steady-state analysis has been done and compared with circular bearing with respect to their load capacity, fl ow rate, pressure distribution and friction factor. The unsteady-state analysis has been used to determine the rotor dynamic coeffi cients for various eccentricity ratios. These coeffi cients are used to determine the stability parameters, such as critical mass and whirl ratio, and prove that wave bearing has not only better load carrying capacity but also provides better stability at high speed than circular bearing.

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Engineering Optimum Design of Fluid-Film Lubricated Bearings

Cited by 35 publications

References 9 publications

The Effect of Disk Location, Shaft Length and Imbalance on Fluid Induced Rotor Vibrations

The Effect of Disk Location, Shaft Length and Imbalance on Fluid Induced Rotor Vibrations

A parallel computing application of the genetic algorithm for lubrication optimization

Static and dynamic characteristics of short wavy journal bearings

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