Practical determination and use of bearing dynamic coefficients

Glienicke, J.; Han, Dongjiang; Leonhard, M.

doi:10.1016/0301-679x(80)90094-8

Cited by 53 publications

(37 citation statements)

References 3 publications

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“…Figure 5 presents as a function of load angle at 40% eccentricity; the stiffness is calculated using (3) and compared with stiffness calculated in the commercial software. The bearing parameters must be transformed, according to (5), in each time step of the simulations due to the load angle dependency of the bearing parameters. Consider the following: where…”

Section: Determination Of Bearing Parametersmentioning

confidence: 99%

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Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings

Nässelqvist

Gustavsson

Aidanpää

2014

International Journal of Rotating Machinery

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In vertically oriented machines with journal bearing, there are no predefined static radial loads, such as dead weight for horizontal rotor. Most of the commercial software is designed to calculate rotordynamic and bearing properties based on machines with a horizontally oriented rotor; that is, the bearing properties are calculated at a static eccentricity. For tilting-pad bearings, there are no existing analytical expressions for bearing parameters and the bearing parameters are dependent on eccentricity and load angle. The objective of this paper is to present a simplified method to perform numerical simulations on vertical rotors including bearing parameters. Instead of recalculating the bearing parameters in each time step polynomials are used to represent the bearing parameters for present eccentricities and load angles. Numerical results are compared with results from tests performed in a test rig. The test rig consists of two guide bearings and a midspan rotor. The guide bearings are 4-pad tilting-pad bearings. Shaft displacement and strains in the bearing bracket are measured to determine the test rig's properties. The comparison between measurements and simulated results shows small deviations in absolute displacement and load levels, which can be expected due to difficulties in calculating exact bearing parameters.

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Section: Determination Of Bearing Parametersmentioning

confidence: 99%

“…Glienicke et al [5] performed tests in a horizontal test rig consisting of a rotor and bearings. The design of Glienickes test rig was similar to the test rig presented in this paper, except for the possibility to only operate the test rig in horizontal orientation.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings

Nässelqvist

Gustavsson

Aidanpää

2014

International Journal of Rotating Machinery

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“…The fluid bearings are modeled in a separate specialized tool which includes the non-linearities and the characteristics of the oils being used (Glienicke et al (1980), Athavale and Hendricks (1996)) and provides suitable damping and stiffness matrices, so that the model of the fluid bearing can be replaced by that of a spring-damper device. One of the main characteristics of the resulting matrices is that they have coupling terms between the different degrees of freedom involved 1 leading generally to non-symmetrical system matrices D o and K o .…”

Section: Model Of the Fluid Bearingsmentioning

confidence: 99%

Model Order Reduction of Rotordynamical Systems

Krenek

Eid

Lohmann

2011

IFAC Proceedings Volumes

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This paper presents an approach for model order reduction of linear rotordynamical systems resulting from the accurate modeling of large machines with a rotor. Automatically partitioning the overall model into decoupled sub-models, describing the main components, namely, rotor, bearing and housing, allows these to be separately considered, and if necessary, reduced using a suitable reduction method. For instance, for large-sized systems with Krylovsubspace methods. The resulting subsystems are then re-coupled to deliver a reduced-order model of the overall machine which can be simulated far faster then when compared to the original one. As an example, the method presented here is applied to reduce a simplified finiteelement model of a gas compressor drive.

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“…The performance of four bearings with various designs (circular-cylindrical, four-lobed, two-lobed and tilting pad bearings) was compared for ideal conditions by Glienicke et al (1980). Major deviations from ideal conditions were observed for high circumferential speed and high specific bearing loads.…”

Section: Wwwtjprcorg Editor@tjprcorgmentioning

confidence: 99%

A Review on Non-Circular Journal Bearings

Jose¹

2018

IJMPERD

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Hydrodynamic bearings depend on the high journal speed to move the pressurized fluid in a wedge between the faces. Instabilities due to oil whip and whirl are usually observed when using hydrodynamic circular journal bearing in high speed rotating machinery. To overcome these difficulties, non-circular bearings are usually preferred over circular bearings. A non-circular journal bearing has increased shaft stability, increased oil flow and reduced power losses as compared to circular journal bearing under proper working conditions. This paper deals with a review of major works conducted on non-circular bearings to improve the performance characteristics. The effect of incorporating pressure dams in bearings, use of porous bearing, use of non-Newtonian lubricants and micropolar lubricants on the static and dynamic characteristics of the bearing have also been analyzed.

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Practical determination and use of bearing dynamic coefficients

Cited by 53 publications

References 3 publications

Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings

Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings

Model Order Reduction of Rotordynamical Systems

A Review on Non-Circular Journal Bearings

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