A novel nonlinear model of rotor/bearing/seal system and numerical analysis

Li, Wei; Yang, Yi; De-ren, Sheng; Chen, Jianhong

doi:10.1016/j.mechmachtheory.2011.01.002

Cited by 49 publications

(22 citation statements)

References 8 publications

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“…In order to meet the increasing challenge to reduce CO 2 emission, ultra-spercritical (USC) coal fired power plants with higher efficiency are developed [1][2][3]. By increasing the steam temperature and pressure entering into the turbines, the efficiency can be improved significantly [4].…”

Section: Introductionmentioning

confidence: 99%

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Liu

et al. 2015

Materials Science and Engineering: A

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Section: Introductionmentioning

confidence: 99%

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Liu

et al. 2015

Materials Science and Engineering: A

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“…They found that the bearing model with turbulent flow effect generated higher hydrodynamic forces when compared to the one without this effect, which highlights the importance of considering such phenomenon during the analysis of high speed hydrodynamic bearings. Li et al (2011a;2011b) applied the Hamilton principle and the finite element method (FEM) to construct a novel nonlinear model of a rotor/bearing/seal system. The dynamic behavior of the system is illustrated by bifurcation diagrams, large Lyapunov exponents, phase trajectory diagrams, and Poincare maps.…”

Section: Introductionmentioning

confidence: 99%

Modeling a two-span rotor system based on the Hamilton principle and rotor dynamic behavior analysis

De-ren

Chen

et al. 2014

J. Zhejiang Univ. Sci. A

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A nonlinear dynamic model of a two-span rotor system is constructed based on the Hamilton principle and the finite element method. The Musznyska model and the short bearing model are employed to describe the nonlinear seal force and oil-film force. The fourth-order Runge-Kutta method is used to calculate the numerical solutions. The bifurcation diagrams, time-history diagrams, phase trajectories, and Poincare maps are presented to analyze the dynamic behavior of the bearing center and the disk center in the horizontal direction. The numerical results indicate that the rotational speed, the nonlinear seal force, the oil-film force, and the stiffness of the coupling have a significant effect on the stability of the rotor system. The dynamic behavior of the two-span rotor system is more complicated when impacted by the nonlinear seal force and oil-film force.

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“…Li et al [9] proposed a novel nonlinear model of rotor/bearing/seal system for steam turbines in power plants. Unsteady bearing oil film force model were applied.…”

Section: Introductionmentioning

confidence: 99%

Identification for Bifurcation and Responses of Rub-impacting Rotor System

Jeng

Hsu

Hun

et al. 2014

Procedia Engineering

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The aim of this study is to investigate the dynamic responses of a rub-impacting rotor system. A response integration method is applied to analyze bifurcation and chaotic responses for the rub-impacting rotor system. This integration method numerically integrates the distance between state trajectory and the origin in the phase plane during a specific period. It provides a quantitative characterization of system responses and can replace the role of the traditional stroboscopic technique (Poincaré section method) to observe bifurcations and chaos of the rotor system with rub-impact. According to the result comparisons from the rub-impacting rotor system, it is inferred that during Poincaré section method being applied to be analyzed the system response periods, the sampling points on Poincaré section might be too close to cause disturbances to analyze if the system response is a high-order sub-harmonic vibration. Thus, the misjudgments for system response periods will be made. The simulation results, however, show that the high-order subharmonic and chaotic responses and their bifurcations can be observed effectively.

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A novel nonlinear model of rotor/bearing/seal system and numerical analysis

Cited by 49 publications

References 8 publications

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Creep behavior and microstructure evaluation of welded joint in dissimilar modified 9Cr–1Mo steels

Modeling a two-span rotor system based on the Hamilton principle and rotor dynamic behavior analysis

Identification for Bifurcation and Responses of Rub-impacting Rotor System

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