The role of damping in ultrasonic friction reduction

Friesen, Rebecca Fenton; Wiertlewski, Michaël; Colgate, J. Edward

doi:10.1109/haptics.2016.7463172

Cited by 23 publications

(19 citation statements)

References 15 publications

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“…There is a phase lag of ∼ 90 • at an amplitude of 1.35 µm that is accompanied by a significant period for which the finger pad is not in contact with the plate; this has been referred to as the bouncing regime [10]. Similar measurements were reported in [11]. At the amplitude of 2.5 µm, the period of the finger displacement has doubled.…”

Section: Resultsmentioning

confidence: 60%

“…The developed model suggests that immobility in the time scale of the oscillations could be applied. Recent studies involving different artificial fingertips suggested that the viscoelasticity of the subcutaneous tissues plays a fundamental role in reducing the friction [10], [11], while the behaviour as a function of vibrational frequency suggests effectively an immobile in the time scale of the oscillations response of the finger pad at the high frequencies associated with ultrasonic devices [28]. This is consistent with the assumption made in the current work that the preloading of the inner tissue is treated as irreversible within the timescale of the vibrations.…”

Section: Hypothesis and Results Analysismentioning

confidence: 99%

“…However, there is a discrepancy between the measured frictional force as a function of the vibrational amplitude at large amplitudes (∼ 2 µm), and what would be expected on the basis of squeeze film levitation [8]. Moreover, it has been established by direct measurement that there is intermittent mechanical contact between a finger pad and an ultrasonic vibrating plate [9], [10], [11], which suggest the possible contribution of a mechanical interaction firstly outlined by Biet et al [12] The aim of the current work is to re-examine the role of the squeeze film effect and intermittent contact in the friction modulation induced by ultrasonic vibration. It will be described in two parts.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Friction Reduction through Ultrasonic Vibration Part 1: Modelling Intermittent Contact

Vezzoli

Vidrih

Giamundo

et al. 2017

IEEE Trans. Haptics

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Ultrasonic vibration is employed to modify the friction of a finger pad in way that induces haptic sensations. A combination of intermittent contact and squeeze film levitation has been previously proposed as the most probable mechanism. In this paper, in order to understand the underlying principles that govern friction modulation by intermittent contact, numerical models based on finite element (FE) analysis and also a spring-Coulombic slider are developed. The physical input parameters for the FE model are optimized by measuring the contact phase shift between a finger pad and a vibrating plate. The spring-slider model assists in the interpretation of the FE model and leads to the identification of a dimensionless group that allows the calculated coefficient of friction to be approximately superimposed onto an exponential function of the dimensionless group. Thus, it is possible to rationalize the computed relative reduction in friction being (i) dependent on the vibrational amplitude, frequency, and the intrinsic coefficient of friction of the device, and the reciprocal of the exploration velocity, and (ii) independent of the applied normal force, and the shear and extensional elastic moduli of the finger skin provided that intermittent contact is sufficiently well developed. Experimental validation of the modelling using real and artificial fingertips will be reported in part 2 of this work, which supports the current modelling.

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Section: Resultsmentioning

confidence: 60%

Section: Hypothesis and Results Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Friction Reduction through Ultrasonic Vibration Part 1: Modelling Intermittent Contact

Vezzoli

Vidrih

Giamundo

et al. 2017

IEEE Trans. Haptics

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“…However, this effect is also an opportunity to examine the complex coupling between tissues, air, and the plate. The mechanical properties of a fingertip around the excitation frequency can be estimated by comparing the complex-valued impedance of the plate with and without the presence of the finger [7], [8], [13], [14]. However, these measurements of the biomechanics of skin assume that the plate and the skin are in perfect contact.…”

Section: Introductionmentioning

confidence: 99%

Estimating Friction Modulation From the Ultrasonic Mechanical Impedance

Huloux

Bernard

Wiertlewski

2021

IEEE Trans. Haptics

Self Cite

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Ultrasonic surface-haptic touchscreens produce compelling tactile sensations directly on the users' fingertips. The tactile sensations stem from the modulation of friction produced by acoustic radiation pressure, which reduces the contact between the skin and the glass plate. During this process, some of the vibrations are partly absorbed by the tissues, resulting in a conspicuous change in the vibration amplitude of the plate upon contact with the finger, which manifests as a net change in the system mechanical impedance. In this study, we leverage the observable change of impedance to estimate the acoustic levitation and the frictional force. The self-sensing method utilizes a model of the first principles governing the physical interaction between the plate and the skin, which relies on multi-scale contact theory. The model accurately describes the experimental influence of the amplitude on the observed impedance (i.e., the amount of energy absorbed and reflected) and can be used to estimate the friction coefficient (R 2 = 0.93). These results provide additional evidence of the partial levitation mechanism at play in ultrasonic friction-modulation. This finding can be useful for designing energy-efficient devices and provide design suggestions for using ultrasonic impedance for self-sensing friction forces.

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“…In order to achieve this, ultrasonic vibration may be used to produce friction reduction on a surface, thus creating a sensation of 'smoothness' [2] (active lubrication). The amount of friction reduction is dependent on the vibration amplitude and frequency [3], and properties of the probing object [4,5].…”

Section: Introductionmentioning

confidence: 99%

Energy Analysis of Lateral vs. Normal Vibration Modes for Ultrasonic Surface Haptic Devices

Guzman

Lemaire‐Semail

Giraud

et al. 2020

Haptics: Science, Technology, Applications

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In this paper, we propose a new device in order to produce normal and lateral ultrasonic vibrations in a plate, using an array of piezoelectric ceramics. This setup serves to continue the comparative analysis between the two vibration modes for tactile feedback rendering, by including an energetic characterization. With the help of a tribological analysis, this study will help to examine the energy performance of each vibration mode in terms of active power consumption against friction contrast (which is linked to perception). Using a simplified second order plate model, the energetic results are analyzed. The results show a better energy efficiency for the lateral vibration for low exploration speeds. The tribological analysis helps as well to evaluate the effect of frequency increase in terms of friction reduction vs. vibration amplitude for both vibration modes.

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The role of damping in ultrasonic friction reduction

Cited by 23 publications

References 15 publications

Friction Reduction through Ultrasonic Vibration Part 1: Modelling Intermittent Contact

Friction Reduction through Ultrasonic Vibration Part 1: Modelling Intermittent Contact

Estimating Friction Modulation From the Ultrasonic Mechanical Impedance

Energy Analysis of Lateral vs. Normal Vibration Modes for Ultrasonic Surface Haptic Devices

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