Influence of ultrasonic vibration on metallic friction

Pohlman, Reimar; Lehfeldt, E.

doi:10.1016/0041-624x(66)90244-7

Cited by 141 publications

(55 citation statements)

References 4 publications

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“…Pohlman and Lehfeldt [6] found that longitudinal tangential vibrations exert a significantly greater influence on the friction force than the normal ones. Papers argued that [7][8][9][10] changes of the friction force vector under the influence of vibrations cyclic are the cause of the reduction of friction resistance.…”

Section: Introductionmentioning

confidence: 99%

Modeling Friction Performance of Drill String Torsional Oscillation Using Dynamic Friction Model

Wang

Chen

Rui

et al. 2017

Shock and Vibration

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Drill string torsional and longitudinal oscillation can significantly reduce axial drag in horizontal drilling. An improved theoretical model for the analysis of the frictional force was proposed based on microscopic contact deformation theory and a bristle model. The established model, an improved dynamic friction model established for drill strings in a wellbore, was used to determine the relationship of friction force changes and the drill string torsional vibration. The model results were in good agreement with the experimental data, verifying the accuracy of the established model. The analysis of the influence of drilling mud properties indicated that there is an approximately linear relationship between the axial friction force and dynamic shear and viscosity. The influence of drill string torsional oscillation on the axial friction force is discussed. The results indicated that the drill string transverse velocity is a prerequisite for reducing axial friction. In addition, low amplitude of torsional vibration speed can significantly reduce axial friction. Then, increasing the amplitude of transverse vibration speed, the effect of axial reduction is not significant. In addition, by involving general field drilling parameters, this model can accurately describe the friction behavior and quantitatively predict the frictional resistance in horizontal drilling.

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Section: Introductionmentioning

confidence: 99%

Modeling Friction Performance of Drill String Torsional Oscillation Using Dynamic Friction Model

Wang

Chen

Rui

et al. 2017

Shock and Vibration

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“…According to (9), it can be found that the friction force calculated by the Dahl model is correlated with tangential contact stiffness coefficient and the elastic deformation of the asperities in the contact zone. And its integral expression is a piecewise function controlled by the relative velocity of the sliding body in relation to the vibration plane, which is bad for the model solution.…”

Section: Model Solution and Verificationmentioning

confidence: 99%

“…Through experimental and theoretical methods, many studies have demonstrated that the frictional force can be dramatically mitigated by imposing mechanical vibrations [9,10]. Roper and Dellinger [11] first proposed the technical ideas of reducing frictional force during slide drilling in the form of invention patent; namely, activating axial vibrations on the drill string using vibrator can lower the frictional force between drill string and borehole rock.…”

Section: Introductionmentioning

confidence: 99%

Effect of Axial Vibration on Sliding Frictional Force between Shale and 45 Steel

Hao

Chen

Liu

et al. 2018

Shock and Vibration

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Activating drill string vibration is an effective means to mitigate the excessive drag encountered during drilling complexstructure wells. However, the Coulomb model cannot describe the sliding friction behavior between drill string and borehole rock with imposed axial vibrations. To solve this problem, a specially designed experimental setup was utilized to investigate the characteristics of axial vibrating-sliding coupling friction. The results indicate that when vibration velocity is greater than sliding velocity, axial vibration can significantly reduce friction force between contact surfaces. Its friction reduction mechanism embodies not only the changes of instantaneous friction force, but also friction coefficient. Meanwhile, a friction coupling model was established based on the Hertz contact theory and Dahl model. The corresponding computational program was developed in Matlab/Simulink environment. The calculation results are in good agreement with the experimental results, verifying the validity of the present method. Furthermore, to overcome the shortcoming of Dahl model, a dynamic friction coefficient model was proposed to evaluate the friction-reducing effect of axial vibration using dimensional analysis method. The model parameters under different lubrication conditions were retrieved through inverse calculation with experimental data. This method provides a new solution for evaluating the friction-reducing effect of hydraulic oscillator and optimizing its placement.

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“…However, if they are caused by mechanical vibrations induced by friction, i.e., frictional vibration [3][4][5][6], the time-averaged spring force may not give the true value of the kinetic frictional force, except in the case of stick-slip in an undamped single-degree-of-freedom (SDOF) system with the Coulomb friction [3]. Many researchers have reported on the effect of externally applied oscillating forces on the friction coefficient [7][8][9][10][11][12][13][14][15][16][17][18][19], which indicates that even when the instrument-related uncertainty [1,2] is negligible, frictional vibrations generate some other errors in tribotesting, although the mechanisms of forced vibration and self-excited vibration are completely different.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Friction Coefficient Measured in Tribotesting: Influence of Frictional Vibration

2014

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Using a novel anti-vibration tribometer with a yaw angle misalignment, Kado et al. (Trans. Jpn. Soc. Mech. Eng. C79: 2635-2643, 2013 have recently shown experimentally that frictional vibration in tribotesting causes considerable error, e.g., a 35% underestimation of the kinetic friction coefficient for the sliding contact between a steel ball and a steel plate lubricated with glycerol. In this paper, it is shown that their experimental results can be numerically simulated based on a purely mechanical model, which confirms that their experiments were carried out properly and also that in conventional tribotesting, the "measured kinetic friction coefficient" (obtained from the time-averaged spring force) is not the "inherent kinetic friction coefficient" (determined by the inherent nature of materials in contact as a function of the relative velocity) but the "effective kinetic friction coefficient" (determined by the mean energy consumption rate as a function of the driving velocity). The effective kinetic friction coefficient depends on the mechanical properties of the tribometer used in the test, and it corresponds to the inherent kinetic friction coefficient when the measurement is carried out with no frictional vibration.

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Influence of ultrasonic vibration on metallic friction

Cited by 141 publications

References 4 publications

Modeling Friction Performance of Drill String Torsional Oscillation Using Dynamic Friction Model

Modeling Friction Performance of Drill String Torsional Oscillation Using Dynamic Friction Model

Effect of Axial Vibration on Sliding Frictional Force between Shale and 45 Steel

Kinetic Friction Coefficient Measured in Tribotesting: Influence of Frictional Vibration

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