Nonlinear dynamics of flexible rotor supported on the gas foil journal bearings

Bhore, Skylab P.; Darpe, Ashish K.

doi:10.1016/j.jsv.2013.04.023

Cited by 44 publications

(10 citation statements)

References 14 publications

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“…The method described in this paper was derived to be used for nonlinear analysis as well as to be extended by incorporating more complex foil structure models based on FEM [18]. Non-linear dynamic simulation tools applied to complex industrial rotors supported by CFB is still demanding faster numerical methods [2,7,13,33,35]. …”

Section: Introductionmentioning

confidence: 99%

Efficient solution of the non-linear Reynolds equation for compressible fluid using the finite element method

Larsen

Santos

2014

J Braz. Soc. Mech. Sci. Eng.

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Section: Introductionmentioning

confidence: 99%

Efficient solution of the non-linear Reynolds equation for compressible fluid using the finite element method

Larsen

Santos

2014

J Braz. Soc. Mech. Sci. Eng.

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“…Moreover, the air is regarded as an ideal compressible flow in the unsteady Reynolds equation. Therefore, the dimensionless Reynolds' equation for compressible fluids under isothermal conditions was calculated by Equation () 26 :

\frac{\partial}{\partial θ} (\overset{true¯}{p h^{3}} \frac{\partial \overset{true¯}{p}}{\partial θ}) + \frac{\partial}{\partial \overset{true¯}{z}} (\overset{true¯}{p h^{3}} \frac{\partial \overset{true¯}{p}}{\partial z}) = Λ \frac{\partial \overset{true¯}{p} \overset{true¯}{h}}{\partial θ},

where θ is attitude angle,

\overset{true¯}{p}

is dimensionless film pressure, Λ is the bearing number,

\overset{true¯}{h}

is dimensionless film thickness, and

\overset{true¯}{z}

is dimensionless axial coordinate.…”

Section: Methodsmentioning

confidence: 99%

Section: Static Performancesmentioning

confidence: 99%

Performances investigation and multi‐objective optimization of gas foil bearings in hydrogen fuel cell vehicles

Shi

Chen

Zhang

et al. 2022

Intl J of Energy Research

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Summary Gas foil bearings are crucial to guarantee stable operation and oil‐free for centrifugal air compressors that pressure the air to the stack in hydrogen fuel cell vehicles. However, the load is smaller and the friction torque is larger. In this study, multi‐objective optimization considering simultaneously both the higher load and lower friction torque is firstly performed to improve the reliability and decrease the energy consumption of the air compressor. The effects and contributions of the factors including rotation speed, nominal clearance, bump foil thickness, and bump pitch on two bearing performances are investigated by the Taguchi method and analysis of variance. The contributions of nominal clearance and rotation speed on the load are 68.82% and 18.62%, while the two factors on the contributions of friction torque are 66.48% and 17.62%, respectively. The optimal combination with the highest grey relational grade value of 0.7736 is obtained based on grey relational analysis. These findings can be used to guide the efficient operation and selection of the centrifugal air compressor in hydrogen energy vehicles.

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“…Unstructured grids are solved using the CV method. Bhore et al [68,69] used the CV method for a GFB model using a two-dimensional grid for discretization. Gauss-Siedel iterative scheme is used to solve the discretized equations.…”

Section: Coupled Fluid-structure Modelmentioning

confidence: 99%

A Review on Modeling and Stability Aspects of Gas Foil Bearing Supported Rotors

Khamari¹,

Kumar²,

Behera³

2023

Tribol. Ind.

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Gas foil bearing rotor (GFBR) systems have received significant interest in the field of rotordynamics and vibration analysis. GFBR systems have a wide range of high-speed turbomachinery applications. Due to the high speed, these machines are susceptible to rigorous vibration and instability. Gas foil bearings instigate large amplitude of vibrations at startup and shut down and severe subsynchronous motions during high-speed operations. Over the years, numerous work has been done in the field of high-speed rotors supported on gas foil bearings. Significant improvement has been observed in the stability and feasibility of the GFBR systems. However, accurate model predictions of gas foil bearing still remain a challenge for its widespread usage in high-speed turbomachinery. A comprehensive review needs to be done to study the previous work and pave the way for future research. The current review is majorly divided into three sections. Firstly, various models used for the performance prediction of gas foil bearings are compiled. After that, major causes of instability that manifest during the experiments and practice with gas foil bearing supported rotors is illustrated. Lastly, the developmental attempts made to inhibit the instability is summarised. This paper presents an overall picture of the current engineering scenario and future prospects of the GFBR systems.

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Nonlinear dynamics of flexible rotor supported on the gas foil journal bearings

Cited by 44 publications

References 14 publications

Efficient solution of the non-linear Reynolds equation for compressible fluid using the finite element method

Efficient solution of the non-linear Reynolds equation for compressible fluid using the finite element method

Performances investigation and multi‐objective optimization of gas foil bearings in hydrogen fuel cell vehicles

A Review on Modeling and Stability Aspects of Gas Foil Bearing Supported Rotors

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