Analytically decoupling of friction coefficient between mixed lubricated fractal surfaces

Yu, Xin; Sun, Yunyun; Wu, Shijing

doi:10.1016/j.ijmecsci.2023.108465

Cited by 13 publications

(2 citation statements)

References 77 publications

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“…Zhao et al 17 considered the effect of roughness on the normal contact stiffness of gears and adopted the fractal method to a contact model suitable for the contact of gear pair is established, and the influence of friction coefficient on the contact surface is studied on the basis of this model. Yu et al 18 proposed a general expression for the coefficient of friction between fractal surfaces in hybrid lubrication, which provides a new idea for the study of gear tribological engineering. According to the energy dissipation mechanism of tangential contact damping, Xiong et al 19 established a tangential contact damping model of tooth surface considering variable friction under dry friction condition by introducing the correction coefficient of tooth surface.…”

Section: Introductionmentioning

confidence: 99%

Study on gear contact stiffness and backlash of harmonic drive based on fractal theory

Yang,

Ma,

Zhang

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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Contact stiffness and backlash in the harmonic drive significantly impact a robot's positioning accuracy and vibration characteristics. The height of the harmonic drive tooth pair is typically less than 1 mm, making the measurement and modeling of backlash and contact stiffness inherently complex. This paper proposes a contact stiffness and backlash model by establishing a correlation between fractal parameters and tooth contact load. To obtain the fractal roughness parameters of the real machined tooth surface, a combination of a noncontact optical profiler and the RMS method is employed. Subsequently, the study explores the influence of rough tooth surface and contact force fractal parameters on contact stiffness and gear backlash. The results demonstrate the substantial impact of surface topography parameters and contact force on contact stiffness and backlash. Specifically, an increase in the fractal dimension correlates with a reduction in gear backlash and contact stiffness. Conversely, the fractal roughness parameter exhibits the opposite effect. Notably, an increase in contact force enhances contact stiffness.

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Section: Introductionmentioning

confidence: 99%

Study on gear contact stiffness and backlash of harmonic drive based on fractal theory

Yang,

Ma,

Zhang

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Shen fei [11] used the three-dimensional Weierstrass-Mandelbrot (WM) function to characterize the fractal function parameters of rough surfaces. Yu xin et al [12] equated the rough surface area to oil film thickness, derived the analytical formula for oil film thickness, and established a generalized closed fractal model of the friction coefficient between fractal surfaces in mixed lubrication. Chen hongxu et al [13] analyzed the effects of fractal dimensions, fractal roughness parameters and Meyer index on contact stiffness, and constructed a modified fractal roughness model to calculate the contact stiffness of fixed joints.…”

Section: Introductionmentioning

confidence: 99%

Analysis, Modeling and Experimental Study of the Normal Contact Stiffness of Rough Surfaces in Grinding

Bai,

Jia,

Guo

et al. 2023

Lubricants

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Grinding is the most important method in machining, which belongs to the category of precision machining processes. Many mechanical bonding surfaces are grinding surfaces. Therefore, the contact mechanism of grinding a joint surface is of great significance for predicting the loading process and dynamic characteristics of precision mechanical products. In this paper, based on the collected grinding surface roughness data, the profile parameters and topography characteristics of the asperity were analyzed, the rough surface data were fitted, the asperity profile was reconstructed, and the parabola y = nx2 + mx + l of the cylindrical asperity model was established. After analyzing the rough surface data of the grinding process, the asperity distribution height was fitted with a Gaussian distribution function, which proved that asperity follows the Gaussian distribution law. The validity of this model was confirmed by the non-dimensional processing of the assumed model and the fitting of six plasticity indices. When the pressure is the same, the normal stiffness increases with the decrease in the roughness value of the joint surface. The experimental stiffness values are basically consistent with the fitting stiffness values of the newly established model, which verifies the reliability and effectiveness of the new model established for the grinding surface. In this paper, a new model for grinding joint surface is established, and an experimental platform is set up to verify the validity of the model.

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Tribo-dynamic modelling and analysis for a high-speed helical gear system with time-varying backlash and friction under Elastohydrodynamic Lubrication condition

Zheng,

Yan,

et al. 2024

Meccanica

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Analytically decoupling of friction coefficient between mixed lubricated fractal surfaces

Cited by 13 publications

References 77 publications

Study on gear contact stiffness and backlash of harmonic drive based on fractal theory

Study on gear contact stiffness and backlash of harmonic drive based on fractal theory

Analysis, Modeling and Experimental Study of the Normal Contact Stiffness of Rough Surfaces in Grinding

Tribo-dynamic modelling and analysis for a high-speed helical gear system with time-varying backlash and friction under Elastohydrodynamic Lubrication condition

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