420 Development of Friction Reducer : Friction while Nano-Scratching to Supersonic vibrating Surface)

Kutomi, Hiroshi; Wyrobek, Thomas J.; Fujii, Hiroshi; Daugela, Antanas

doi:10.1299/jsmetokai.2000.49.221

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“…Due to the frequent need to minimise the force necessary to introduce a body into sliding motion and maintain this movement, the phenomenon of reducing the friction force has been and still is the subject of interest among scientists in many research centres around the world. The authors' own studies [1][2][3][4][5][6][7][8] and the works of other authors [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] indicate that introducing the shifted body or the substrate on which the slip takes place into a vibrating motion in a direction tangential to the track can significantly reduce the driving force, Fd. This phenomenon is identified with the reduction of the average friction force, 𝐹 ̅ 𝑓 [19].…”

Section: Introductionmentioning

confidence: 99%

Effectiveness of Friction Force Reduction in Sliding Motion Depending on the Frequency of Longitudinal Tangential Vibrations, Sliding Velocity and Normal Pressure

Leus,

Gutowski,

Rybkiewicz

2023

Acta Mechanica Et Automatica

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The article presents the results of experimental research and simulation analyses of the influence of slip velocity, normal pressures and vibration frequency on the effectiveness of friction force reduction carried out in sliding motion in the presence of forced tangential vibrations. In experimental studies, changes in the driving force were measured during the slip of the upper body over the vibrating lower body. The direction of these vibrations was parallel both to the contact plane and to the direction of movement of the shifted body. The simulation tests were carried out in the Matlab/Simulink environment through the use of numerical procedures that were specially created for this purpose. Dynamic friction models considering the tangential compliance of contact and the phenomenon of pre-sliding displacement were used for calculations. The paper presents the designated values of the so-called coefficient of average friction force reduction in sliding motion for the following friction pairs: steel C45–steel C45, steel C45–cast iron GGG40 and steel C45–polytetrafluoroethy-lene PTFE (Teflon). The results of numerical analyses were in good agreement with those of experimental tests. A significant dependence of the level of average friction force reduction on the frequency of forced vibrations, sliding velocity as well as the kind of sliding pair material, and normal pressures was shown.

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