Nonlinear dynamic analysis of a flexible rotor supported by micropolar fluid film journal bearings

Chang‐Jian, Cai‐Wan; Chen, Cha’o-Kuang

doi:10.1016/j.ijengsci.2006.06.008

Cited by 41 publications

(21 citation statements)

References 17 publications

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“…Chang-Jian and Chen [18,19] have approved that flexible rotor-bearing system would be more suitable to describe the dynamic motions of rotor-bearing systems. To obtain solutions which more closely approximate the dynamic behavior of real rotor-bearing systems, it is necessary to consider the flexible rubimpact rotor supported by turbulent journal bearings and lubricated with couple stress fluid under quadratic damping and nonlinear suspension.…”

Section: Nomenclature Bmentioning

confidence: 99%

Nonlinear analysis of a rub-impact rotor supported by turbulent couple stress fluid film journal bearings under quadratic damping

Chang‐Jian

Chen

2008

Nonlinear Dyn

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This work reports a numerical study undertaken to investigate the dynamic response of a rotor supported by two turbulent flow model journal bearings with nonlinear suspension and lubricated with couple stress fluid under quadratic damping. This may be the first time that analysis of rotor-bearing system considered the quadratic damping effect. The dynamic response of the rotor center and bearing center are studied. The analysis methods employed in this study are inclusive of the dynamic trajectories of the rotor center and bearing center, power spectra, Poincaré maps and bifurcation diagrams. The maximum Lyapunov exponent analysis is also used to identify the onset of chaotic motion. The modeling results provide some useful insights into the design and development of rotor-bearing system for rotating machinery that operates at highly rotational speed and highly nonlinear regimes.

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Section: Nomenclature Bmentioning

confidence: 99%

Nonlinear analysis of a rub-impact rotor supported by turbulent couple stress fluid film journal bearings under quadratic damping

Chang‐Jian

Chen

2008

Nonlinear Dyn

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“…Nagaraju et al [19] in their study found the stability margin of a roughened hole-entry orifice compensated hybrid journal bearing system. A nonlinear dynamic analysis of a flexible rotor supported by micropolar fluid film journal bearings was done by Chan-Jian et al [20]. Kushare et al [21] demonstrated in their theoretical study, how the non-Newtonian behavior of the lubricant has profound influence on journal trajectories and stability of a worn hybrid journal bearing.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Linear and Nonlinear Stability Analysis of Hybrid Journal Bearing Operating with Micropolar Lubricant

Budheeja

Verma

2017

Tribology Online

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The present study discusses the effect of micropolar parameters on the stability of symmetric hole-entry hybrid journal bearing system compensated with capillary restrictor. Finite element method has been used to solve the modified Reynolds equation for the flow of micropolar lubricant through the bearing. The linearized and nonlinear equations of motion are solved numerically using fourth order Runge-Kutta Method at each integration time step. Solution of these equations provides the locus of moving journal center and the journal trajectories are plotted with the help of a computer program. A Routh-Hurwitz stability criterion has been applied to calculate the critical mass of the journal to analyze the stability of journal. A comparative analysis for linear and nonlinear models considering Newtonian and micropolar lubricants has been done. The results obtained indicate that micropolar parameters affect the performance as well as the stability margin of the hybrid journal bearing system considerably and nonlinear analysis provides quick response as compared to linear one.

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“…As a result, the analysis tends to become complicated. Chang-Jian and Chen [14][15][16][17] presented a series of papers on the nonlinear dynamics of rotor-bearing systems under nonlinear suspension and also combined with rub-impact effect, turbulent effect and micropolar lubricant into consideration. They found very bountiful non-periodic responses occurring in the rotor-bearing systems.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear numerical analysis of a flexible rotor equipped with squeeze couple stress fluid film journal bearings

Chang‐Jian

Yau

2007

Acta Mech. Solida Sin.

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This study performs a dynamic analysis of a rotor supported by two squeeze couple stress fluid film journal bearings with nonlinear suspension. The numerical results show that the stability of the system varies with the non-dimensional speed ratios and the dimensionless parameter l * . It is found that the system is more stable with higher dimensionless parameter l * . Thus it can conclude that the rotor-bearing system lubricated with the couple stress fluid is more stable than that with the conventional Newtonian fluid. The modeling results thus obtained by using the method proposed in this paper can be used to predict the stability of the rotor-bearing system and the undesirable behavior of the rotor and bearing center can be avoided.

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Nonlinear dynamic analysis of a flexible rotor supported by micropolar fluid film journal bearings

Cited by 41 publications

References 17 publications

Nonlinear analysis of a rub-impact rotor supported by turbulent couple stress fluid film journal bearings under quadratic damping

Nonlinear analysis of a rub-impact rotor supported by turbulent couple stress fluid film journal bearings under quadratic damping

A Comparative Linear and Nonlinear Stability Analysis of Hybrid Journal Bearing Operating with Micropolar Lubricant

Nonlinear numerical analysis of a flexible rotor equipped with squeeze couple stress fluid film journal bearings

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