The nonlinear nature of friction coefficient in lubricated sliding friction

Zhou, Yuankai; Zhu, Hua; Zuo, Xue; Li, Yan; Chen, Nanxuan

doi:10.1016/j.triboint.2015.02.027

Cited by 33 publications

(7 citation statements)

References 32 publications

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“…The projection of multidimensional phase-space matrix was carried out using the method of principal component analysis (PCA). Often, the phase-trajectory of friction-induced signals were generally described using statistical measures, including correlation dimension, Lyapunov exponent (Ding et al, 2018) and K 2 entropy (Zhou et al, 2015). Recently, brand new parameters have also been introduced to characterize the tribosystem Sun and Zhu, 2019).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the friction-induced attractor trajectories during the running-in process in ball-on-disk tribosystem

Wang,

Sun,

Wang

et al. 2024

ILT

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Purpose The purpose of this study is to solve the issues of time-consuming and complicated computation of traditional measures, as well as the underutilization of two-dimensional (2D) phase-trajectory projection matrix, so a new set of features were proposed based on the projection of attractors trajectory to characterize the friction-induced attractors and to reveal the tribological behavior during the running-in process. Design/methodology/approach The frictional running-in experiments were conducted by sliding a ball against a static disk, and the friction coefficient was collected to reconstruct the friction-induced attractors. The projection of the attractors in 2D subspace was then mapped and the distribution of phase points was adapted to conduct the feature extraction. Findings The evolution of the proposed moment measures could be described as “initial rapid decrease/increase- midterm gradual decrease/increase- finally stable,” which could effectively reveal the convergence degree of the friction-induced attractors. Moreover, the measures could also describe the relative position of the attractors in phase–space domain, which reveal the amplitude evolution of signals to some extent. Originality/value The proposed measures could reveal the evolution of tribological behaviors during the running-in process and meet the more precise real-time running-in status identification.

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Section: Introductionmentioning

confidence: 99%

Characterization of the friction-induced attractor trajectories during the running-in process in ball-on-disk tribosystem

Wang,

Sun,

Wang

et al. 2024

ILT

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“…Friction coefficient was monitored as a function of time and wear of contact surface was determined after the test by means of topography analysis. Zhou et al [19] studied friction coefficient within the lubricated sliding friction. The power spectrum, twoorder Renyi entropy were used to detect the nature of friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

A Novel Method for Determination of Kinetic Friction Coefficient using Inclined Plane

et al. 2021

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Presented in this paper is the theoretical background for a novel method for determination of kinetic friction coefficient. The method is based on the equation of movement of a rigid body along an inclined plane and has not been previously discussed in literature. According to the theoretical results presented in this paper, mean kinetic friction coefficient can be determined based on the time it takes a rigid body to travel a distance along an inclined plane. Experimental results show that the mean kinetic friction coefficient increases with increasing mean sliding velocity, i.e. with decreasing sliding time. Increasing sliding velocity increases deviation of friction coefficients. This method also allows the determination of energy consumed due to friction along the travelled distance. Increasing mean kinetic friction coefficient and mean sliding velocity increases energy consumed due to friction. Practical calculation requires application of the distance law, which, in turn, requires accurate measurement of the sliding time and distance.

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“…In recent decades, the hydrodynamic response of a journal bearing with cavitation has been studied by many researchers, both analytically and experimentally (Sharma and Pandey, 2006; Cheng and Jiang, 2014; Wang and Xing, 2015; Zhou et al , 2015b; Dhande et al , 2018). Knight and Ghadimi (1992, 2001) conducted the hydrodynamic lubrication analysis of a journal bearing by an experiment.…”

Section: Introductionmentioning

confidence: 99%

Effect of groove shape on the hydrodynamic lubrication of journal bearing considering cavitation

Chen

Feng

Sun

et al. 2019

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Purpose The purpose of this study is to investigate the influence of groove shape on the hydrodynamic characteristics of a journal bearing. Design/methodology/approach The computational fluid dynamics model also takes into account the cavitation phenomena and thermal effect, which can illustrate the lubrication performance of a journal bearing. Findings The hydrodynamic simulations of the journal bearing with the different groove shapes are conducted under different operation conditions. Originality/value Based on the numerical analysis, the suggestions are presented for groove shape selection and can be used to the design of a journal bearing under the extreme operation condition.

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The nonlinear nature of friction coefficient in lubricated sliding friction

Cited by 33 publications

References 32 publications

Characterization of the friction-induced attractor trajectories during the running-in process in ball-on-disk tribosystem

Characterization of the friction-induced attractor trajectories during the running-in process in ball-on-disk tribosystem

A Novel Method for Determination of Kinetic Friction Coefficient using Inclined Plane

Effect of groove shape on the hydrodynamic lubrication of journal bearing considering cavitation

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