Amplitude Control of an Ultrasonic Vibration for a Tactile Stimulator

Messaoud, Wael Ben; Giraud, Frédéric; Lemaire‐Semail, Betty; Amberg, Michel; Bueno, Marie-Ange

doi:10.1109/tmech.2016.2535300

Cited by 16 publications

(11 citation statements)

References 32 publications

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“…To create different tactile effects on the touch surface using ultrasonic actuation technique, vibration amplitude (V amp ) and transition time (t amp r ) are used as the main control parameters. Finger damping during contact may cause fluctuations in V amp and an active control might be required [32], [33]. However, in our experiments, the recorded vibration amplitude showed reasonable precision and accuracy without any active control, as depicted in Fig.…”

Section: Psychophysical Experiments a Variable Friction Tactile mentioning

confidence: 64%

Tactile Perception of Virtual Edges and Gratings Displayed by Friction Modulation via Ultrasonic Actuation

Saleem

Yılmaz

Başdoğan

2020

IEEE Trans. Haptics

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To render tactile cues on a touchscreen by friction modulation, it is important to understand how human perceive a change in friction. In this study, we investigate the relations between perceived change in friction on an ultrasonically actuated touchscreen and parameters involved in contact between finger and its surface. We first estimate the perceptual thresholds to detect rising and falling friction while finger is sliding on the touch surface. Then, we conduct intensity scaling experiments and investigate the effect of finger sliding velocity, normal force, and rise/fall time of vibration amplitude (transition time) on the perceived intensity of change in friction. In order to better understand the role of contact mechanics, we also look into the correlations between the perceived intensities of subjects and several parameters involved in contact. The results of our experiments show that the contrast and rate of change in tangential force were best correlated with the perceived intensity. The subjects perceived rising friction more strongly than falling friction, particularly at higher tangential force contrast. We argue that this is due to hysteresis and viscoelastic behavior of fingertip under tangential loading. The results also showed that transition time and normal force have significant effect on our tactile perception.

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Section: Psychophysical Experiments a Variable Friction Tactile mentioning

confidence: 64%

Tactile Perception of Virtual Edges and Gratings Displayed by Friction Modulation via Ultrasonic Actuation

Saleem

Yılmaz

Başdoğan

2020

IEEE Trans. Haptics

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“…Using modal decomposition, the initial value of the modes at focusing moment is known and their time dependence is described by eq. (5). As a result, a comprehensive knowledge of the excitation signal is available and in the perspective of closed loop control, an at resonance control of the modes is required, which already exists in literature [10] [5].…”

Section: B Modes Selectionmentioning

confidence: 99%

“…This is motivated by the fact that at resonance, the forces -hence the voltages-needed for the vibration are minimal. Considering now the dynamic equation of one mode (5), and replacing the displacement, velocity and acceleration fields, one gets after some algebra :…”

Section: Open Loop Voltages Calculationmentioning

confidence: 99%

“…This results in a modulation of the apparent friction coefficient, which can be explained by the non linear behavior of the air trapped between the interface and the finger (squeeze effect), or by intermittent contact of the vibrating surface with the finger [3], [4]. The vibration can then be switched on and off according to a measurement of the user's finger position to lure the user and render texturized surfaces [5]. However, since the whole surface is vibrated, it is difficult to offer a multi finger haptic interaction although some approaches could address this problem [6].…”

Section: Introductionmentioning

confidence: 99%

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Differentiated haptic stimulation by modal synthesis of vibration field

Enferad

Giraud-Audine

Giraud

et al. 2018

2018 IEEE Haptics Symposium (HAPTICS)

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To date, several focusing techniques have been proposed to realize localized stimulation on haptic interfaces. The localized stimulation can be achieved using arrays of actuators with delayed excitation, or by time reversal techniques which require a preliminary learning phase. The stimulation is thus limited to prerecorded cases. Additionally, these techniques are sensitive to parameters variation and disturbances. On the other hand, modal decomposition is another technique which allows to realize arbitrary vibration fields congruent with the boundary conditions without any preliminary learning phase. In this paper, we propose to use modal decomposition to realize a desired vibration velocity field in order to have differentiated stimuli. The experimental results validate the ability of the method to approximate satisfactorily a desired reference form. The psychophysic evaluations show that users can differentiate and localize the stimulation while exploring a surface with two fingers.

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“…The VCM has been successfully applied on a wide range of electromagnetic actuators [15] to reach outstanding performances in transitory operations or to realize sensorless drives. In the case of PT, the VCM allows both resonance fequency tracking and vibration amplitude control using two loops operating in parallel [16]. The VCM can also be used to synchronize ultrasonic transducers, in order to generate a traveling wave [17] for instance.…”

Section: Introductionmentioning

confidence: 99%

Vector Control of Piezoelectric Transducers and Ultrasonic Actuators

Ghenna

Giraud

Giraud-Audine

et al. 2018

IEEE Trans. Ind. Electron.

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. Abstract-This paper presents the implementation of a novel vibration amplitude control and resonant frequency tracking for piezoelectric transducers (PTs) and ultrasonic motors (USMs). It is based on a generalization of the vector control method to the PT and the USM, which is explained in the first part. We show that two independent controllers with a similar structure are required: one tracks the resonant frequency and the second controls the amplitude. We then present the implementation into a low-cost digital signal processing controller with a sampling period of 200 µs. Experimental results on a Langevin transducer achieved a time response of 20 ms approximately, and the generality of the method is further demonstrated on a 2-D tactile stimulator at the end of this paper.

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Amplitude Control of an Ultrasonic Vibration for a Tactile Stimulator

Abstract: International audienc

Cited by 16 publications

References 32 publications

Tactile Perception of Virtual Edges and Gratings Displayed by Friction Modulation via Ultrasonic Actuation

Tactile Perception of Virtual Edges and Gratings Displayed by Friction Modulation via Ultrasonic Actuation

Differentiated haptic stimulation by modal synthesis of vibration field

Vector Control of Piezoelectric Transducers and Ultrasonic Actuators

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