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Approche multimodale pour la conception d'interfaces à retour tactile à plusieurs doigts

Abstract : Tactile display devices are used for providing tactile feedback to their users. They can reproduce the illusion of textured surface by controlling the friction between a vibrating surface and a sliding finger on it. For most of these devices, the basic principle is to use a single resonant mode whose frequency and wave form are imposed by the nature of the material and the geometry of the device. The mode is selected to achieve a homogeneous stimulation, and thereby tactile sensation is undifferentiated over the entire surface. The single mode tactile devices are limited for applications which require more varied information on surface. This work introduces a novel approach for tactile feedback based on the superposition of several vibration modes. The modes are excited simultaneously to perform a more complex wave form and are capable to generate multitouch tactile feedback. This approach has been validated for the case of a beam where two vibration modes were superimposed to generate a differentiated tactile simulation with two fingers. Thanks to vector control method applied to a piezoacturator. A tracking system was implemented to give a multitouch illusion based on the positions of the two fingers. This multimodal approach was later extended to the case of a thin plate where different spatial distributions of the displacement have been imposed, which causes different friction coefficients over the entire surface of the structure. The approach developed in this work is also capable to generate and control a travelling wave amplitude and direction. For this reason, we evaluated the interest of travelling waves in touch interfaces. The achieved results show that it is possible to obtain two different sensations according to the controlled direction of travelling wave. Psychophysical assessments of proposed devices clearly show the interest to use several vibration modes in tactile feedback simulation.
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Contributor : Sofiane Ghenna <>
Submitted on : Tuesday, May 23, 2017 - 10:28:33 AM
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  • HAL Id : tel-01526451, version 1

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Sofiane Ghenna. Approche multimodale pour la conception d'interfaces à retour tactile à plusieurs doigts. Sciences de l'ingénieur [physics]. Université Lille 1 - Sciences et Technologies, 2016. Français. ⟨tel-01526451⟩

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