Sliding friction in the presence of ultrasonic oscillations: superposition of longitudinal oscillations

Littmann, W. E.; Storck, Heiner; Wallaschek, Jörg

doi:10.1007/s004190100160

Cited by 127 publications

(53 citation statements)

References 3 publications

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“…Comparatively speaking, the Dahl model is studied and applied widely because it can be implemented with ease and few parameters need to be tuned. Meanwhile, many scholars [21][22][23][24] investigated the effect of axial vibration on steel-steel sliding friction behavior through experiment. The results reveal the friction reduction mechanism of axial vibration (i.e., "friction vector effect") and verify the validity and practicability of Dahl model.…”

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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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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“…An idea also brought up by Edeler [89] (p. 98) is to use so-called ultrasonic friction reduction [273,274] during the retraction phase. High-frequency vibrations of the stator would change the direction of the friction force for fractions of this phase, effectively reducing the average friction force.…”

Section: Discussionmentioning

confidence: 99%

Piezoelectric Inertia Motors—A Critical Review of History, Concepts, Design, Applications, and Perspectives

Hunstig

2017

Actuators

115

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Piezoelectric inertia motors-also known as stick-slip motors or (smooth) impact drives-use the inertia of a body to drive it in small steps by means of an uninterrupted friction contact. In addition to the typical advantages of piezoelectric motors, they are especially suited for miniaturisation due to their simple structure and inherent fine-positioning capability. Originally developed for positioning in microscopy in the 1980s, they have nowadays also found application in mass-produced consumer goods. Recent research results are likely to enable more applications of piezoelectric inertia motors in the future. This contribution gives a critical overview of their historical development, functional principles, and related terminology. The most relevant aspects regarding their design-i.e., friction contact, solid state actuator, and electrical excitation-are discussed, including aspects of control and simulation. The article closes with an outlook on possible future developments and research perspectives.

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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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Sliding friction in the presence of ultrasonic oscillations: superposition of longitudinal oscillations

Cited by 127 publications

References 3 publications

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

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

Piezoelectric Inertia Motors—A Critical Review of History, Concepts, Design, Applications, and Perspectives

Kinetic Friction Coefficient Measured in Tribotesting: Influence of Frictional Vibration

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