Rotor dynamic analysis of the vertical hydro-hybrid bearing rotor coupled system of a two-circuit main loop liquid Sodium pump system

Xie, Zhongliang; Zhu, Weidong

doi:10.1016/j.anucene.2021.108139

Cited by 12 publications

(4 citation statements)

References 28 publications

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“…The rotor dynamics of liquid-metal bearings are usually analyzed and compared through eccentricity and rotating speed testing [235]. To optimize the working conditions, researchers determine the natural frequency, vibration modes, and vibration amplitudes at key points of the bearing structures [236].…”

Section: Liquid Metal Lubricated Bearingsmentioning

confidence: 99%

“…The authors then analyzed the influences of hole machining errors on the load carrying capacities of helical grooved liquid metal lubricated bearings [240]. Xie and Zhu [235] combined the finite element technique with rotor dynamics to analyze the dynamic characteristics and modal vibration characteristics of liquid metal lubricated bearings. They identified the thresholds of the operating parameters that ensure normal operation of the liquid metal lubricated bearings.…”

Section: Liquid Metal Lubricated Bearingsmentioning

confidence: 99%

See 1 more Smart Citation

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

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Fluid lubricated bearings have been widely adopted for supporting components of high-end equipments in the field of metrology, semi-conductor, aviation, strategic defense, ultra-precision manufacturing, medical treatment and power generations. These fields all involve extreme working conditions such as ultra-high moving precision, ultra-high rotation speed, ultra-heavy bearing load, ultra-high environmental temperature, high radiation and high vacuum, which present challenges for the design and optimization of reliable fluid lubricated bearings. Breakthrough of any related bottlenecks will promote the development course of high-end equipments. To further promote the advancement of high-end equipments, this paper reviews the design and optimization of fluid lubricated bearings operated with typical extreme working performances. Targeting on the realization of extreme working perfor mances, the current challenges, the current solutions, the underlying deficiencies and the promising developing directions regarding to the design and optimization of fluid lubricat ed bearings are systematically pointed out. This paper can provide guidance for choosing suitable fluid lubricated bearings and optimizing their structures based on required extremeworking performances.

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Section: Liquid Metal Lubricated Bearingsmentioning

confidence: 99%

Section: Liquid Metal Lubricated Bearingsmentioning

confidence: 99%

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

View full text Add to dashboard Cite

show abstract

“…The stability of the rotor-journal bearing system holds pivotal significance in large rotating machines such as compressor turbines and machine tools [1]. Scholars have conducted extensive analytical studies on the dynamic characteristics of bearings based on the solution to the Reynolds equation [2][3][4]. Numerically, the stability of the rotor-journal bearing system was initially studied by solving dynamic characteristic coefficients during the early stages of bearing dynamic characteristic research.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of the Rotor-Journal Bearing System Considering Shear and Gaseous Cavitation

Sun,

Shi,

Jiang

et al. 2024

Lubricants

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Part of the gas phase within the bearing emanates from the gaseous lubricating medium generated by the phase transition of the liquid lubricant under low pressure, while the remaining portion originates from the expansion of gases, such as air, present in the lubricant. This study delves into the impact of vapor and gas cavitation on the stability of the rotor-journal bearing system. Utilizing computational fluid dynamics (CFD), a 3D transient lubrication model is developed for the rotor-journal bearing system. This model integrates a combined cavitation approach, encompassing both vaporous and gaseous cavitation phenomena. Based on a new structured dynamic mesh method, the journal orbits are obtained when the journal moves in the rotor-journal bearing system. In vaporous and gaseous cavitation, shear stress and non-condensable gases (NCG) are incorporated successively. Compared with the combined cavitation model, the basic cavitation model journal orbit amplitude is significantly larger than the combined cavitation model. The carrying capacity of journal bearings under the basic cavitation model is overestimated, leading to a more conservative prediction for system stability.

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“…Although the nonlinearity of structure stiffness was considered in previous studies, the nonlinearity of the damping was not captured satisfactorily. In addition, the low load-carrying capacity and insufficient structural damping of the conventional bump-type foil gas bearings limited their widespread application for the extreme high-speed scenario (Jeong et al, 2017; Xie and Zhu, 2021). The metal rubber can be desirable for the supports and the vibration dampers (Andrés and Chirathadam, 2012; Ma et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Fractional-order model and nonlinear vibration analyses of hybrid gas journal bearing–rotor system

Zhang

Jiang

et al. 2022

Journal of Vibration and Control

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It is important to propose a reasonable nonlinear dynamic model of gas dynamic bearing–rotor system for the stable operation of turbocharger. This paper presents a hybrid gas journal bearing (HGJBs)–rotor system with flexible supporting structure. A fractional-order dynamic model of the symmetrical flexible HGJB–rotor system is established. A tracking–alarming method is proposed to obtain the rotational speed ratio at the bifurcation point. The stable and unstable regions of the rotational speed ratio Ωω for both the rigid bearing–rotor system and flexible HGJB–rotor system are analyzed. The nonlinear dynamic behaviors of HGJB–rotor system versus the fractional order αd and rotational speed ratio Ωω are studied. Results show the fractional-order dynamic model can realize the reasonable prediction of nonlinear dynamic behaviors. An increase in the rotational speed ratio Ωω and the decrease of fractional order αd result in a growth of the vibration amplitude. The adoption of flexible supporting structure is a good strategy to increase the size of stable region.

show abstract

Rotor dynamic analysis of the vertical hydro-hybrid bearing rotor coupled system of a two-circuit main loop liquid Sodium pump system

Cited by 12 publications

References 28 publications

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Stability Analysis of the Rotor-Journal Bearing System Considering Shear and Gaseous Cavitation

Fractional-order model and nonlinear vibration analyses of hybrid gas journal bearing–rotor system

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