Influence of oil film nonlinearity on identification accuracy of dynamic characteristic coefficient of heavy-duty sliding bearing

Chen, Runlin; Tang, Jie; Xu, Fan; Du, Chenglie; Cui, Yahui; Li, Kai

doi:10.1007/s40430-023-04157-2

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…With the arrival of the fourth industrial revolution, green and intelligent has become one of the mainstream directions for the development of mechanical products. Green energy in the field of power machinery, such as nuclear energy, hydroelectric power, wind power and other green energy has become a major trend in the development of the unit with the increase in capacity and power generation efficiency, and the subsequent increase in the size of the rotor and bearings, which puts forward stringent requirements on the bearing performance as well as the stability and reliability of the rotor bearing system [1] [2] .Tilting pad journal bearings are widely used in rotating machinery rotor systems for high parameter operating conditions due to their inherent dynamic stability characteristics. In order to select and design a tilting pad bearing that is compatible with a given operating condition, it is necessary to obtain accurate properties such as bearing temperature, oil film thickness, stiffness and damping coefficient, etc [3][4] [5] .…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Low Speed Lubrication Characteristics of Large Tilting Pad Bearings

Yang,

quan,

Chen

et al. 2024

Preprint

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Abstract：For large generator sets, during low-speed operation such as start-stop or low-speed driving, there may be instances where hydrodynamic lubrication can’t be established, leading to boundary lubrication between bearing and the shaft. This situation can result in bearing damage and cause safety incidents. Therefore, it is necessary to study the lubrication characteristics of bearings under low-speed operation. In this paper, the lubrication properties of the unevenly distributed six-pad tilting pad bearings in an in-service unit are analyzed through theoretical calculations. The analysis focuses on parameters such as film thickness and temperature of the bearing pads under low-speed operating conditions. A full-size test bench is set up to examine the lubrication properties of bearings made of two materials - Babbitt alloy and fluoroplastic, and the pads temperatures, film thicknesses, and vibration characteristics of the bearings are tested under actual operating conditions. The test results show that: the 6-pad small wrap angle bearings designed do not have tile burning phenomenon under low-speed working condition (40r/min), the bearing made of fluoroplastic material has lower temperatures compared to those made of Babbitt alloy, with higher pivot film thickness than that of the Babbitt alloy; The bearing pivot film thickness value using VG68 oil is larger than that of VG46, and the values of the temperature of the pad measurement point are larger than that of VG46.This research paper validates the feasibility of the bearing design scheme for this unit and provides data support for the design and safe operation of similar units.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Low Speed Lubrication Characteristics of Large Tilting Pad Bearings

Yang,

quan,

Chen

et al. 2024

Preprint

View full text Add to dashboard Cite

show abstract

Experimental study on low-speed lubrication characteristics of large tilting pad bearings

Peiji,

Quan,

Runlin

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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Nonlinear dynamic of flexible rotor supported by turbulent bearings with quadratic damping and temperature dependent viscosity

Chang-Jian,

Chu,

Chen

2024

Advances in Mechanical Engineering

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A nonlinear dynamic model of a rotor supported by the turbulent journal bearing with quadratic damping under nonlinear suspension is presented in this study, and the lubricating oil is assumed to be temperature-dependent. The bifurcation diagrams, dynamic trajectories, power spectra, Poincaré map, Lyapunov exponent, and fractal dimension are used to verify the dynamic characteristics of the rotor-bearing system, and abundant subharmonic, and even chaotic motions are found. Temperature is one of the key parameters affecting the dynamic responses of the system, and the dynamic responses will perform non-periodic or even chaotic motions with higher working temperatures of lubricant fluid, as proved in this study. Nonlinear dynamic simulation analysis results will help engineers avoid unnecessary trial and error when designing and applying rotating machinery systems.

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Influence of oil film nonlinearity on identification accuracy of dynamic characteristic coefficient of heavy-duty sliding bearing

Cited by 3 publications

References 29 publications

Experimental Study on Low Speed Lubrication Characteristics of Large Tilting Pad Bearings

Experimental Study on Low Speed Lubrication Characteristics of Large Tilting Pad Bearings

Experimental study on low-speed lubrication characteristics of large tilting pad bearings

Nonlinear dynamic of flexible rotor supported by turbulent bearings with quadratic damping and temperature dependent viscosity

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