Haptics by time reversal of elastic waves

Wöckel, Sebastian; Steinmann, Ulrike; Arndt, H.

doi:10.1109/ultsym.2016.7728754

Cited by 6 publications

(3 citation statements)

References 8 publications

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“…Different methods are proposed in the literature for generating localized vibrotactile feedback on large touch surfaces. Localized vibration rendering is achieved on large surfaces in the ultrasonic frequency range using Eigen function superposition [19] and time reversal wave focusing [18], [20], [21]. Another approach to localized vibrotactile rendering is the confinement of vibrotactile stimulation above the actuator in narrow plates [22].…”

Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Evaluation of Haptic Localization Using Electrostatic Vibration Actuators

et al. 2023

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Touch screen devices have become ubiquitous in modern day-to-day lives. While smaller touchscreen devices provide enough user engagement with meaningful haptic feedback, large touch devices still lack meaningful haptic stimulation. Existing literature for large touch surface vibrotactile localization uses many actuators and conventional boundary conditions. Previous numerical studies on haptic localization do not address multi-frequency excitation. This research proposes a new spring-damper boundary condition for a large bar-type display. Subsequently, a mechanical model of the large touch bar surface with multipleelectrostatic vibration actuators is developed using material damping information with multi-frequency excitation. Simultaneously, an experimental setup is developed for validation of the developed model. An optimization technique to localize vibrotactile haptic rendering at multiple selected zones of the touch bar is proposed. It has been established that by varying frequencies of excitation of two electrostatic resonant actuators, localizable vibrotactile feedback can be generated across the length of the touch bar. The experimental results corroborate the simulation results. Finally, the proposed optimization strategy for multi-zone vibrotactile rendering is experimentally verified.

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Section: Introductionmentioning

confidence: 99%

Modeling and Experimental Evaluation of Haptic Localization Using Electrostatic Vibration Actuators

et al. 2023

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“…On the other hand, low frequency implementations of those approaches always yield 1 Lucie Pantera and Charles Hudin are from CEA, LIST, F-91191 Gif-sur-Yvette, FRANCE. lucie.pantera@cea.fr charles.hudin@cea.fr to poorly localized stimulations [12], [13], [14]. Inverse filter is an other technique that finds applications in medical imaging [15] and spatial audio rendering [16], [17] but suffers from the same diffraction limit.…”

Section: Introductionmentioning

confidence: 99%

Sparse Actuator Array Combined with Inverse Filter for Multitouch Vibrotactile Stimulation

Panter¹,

Hudin²

2019

2019 IEEE World Haptics Conference (WHC)

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Because vibrations propagate and reverberate, providing precise and distinct vibrotactile stimulation to multiple fingers in contact simultaneously with a touch surface is challenging. Previous research has demonstrated that it is possible to render localised multitouch feedback using piezoelectric actuators. This paper shows that a sparse array of piezoelectric actuators glued to the surface and driven by an inverse filtered signal can overcome those propagation effects and produce undistorted and independent vibrotactile stimuli. Different experiments have been conducted in order to prove that it is possible to realise localised multitouch in any point of a plate. Then an experiment have been realised in order to highlight the impact of the finger on the stimulation signal.

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“…Those two issues can be solved by localizing the vibration, that is by ensuring that vibration produced at a chosen position cannot be felt at an other. Existing approaches for localized haptics can be sorted in two types: on one hand, wavefield shaping approaches like Time Reversal [6], [7], [8], Inverse Filter [9], Modal Synthesis [10], [11] or Airborn Ultrasound [12] use signal processing and control strategies to create high amplitude vibrations at specific positions while maintaining vibration level low at others. On the other hand, confinement approaches like non-radiating frequencies [13] and patterned or damped surfaces [14] prevent vibrations from propagating outside of the actuated area.…”

Section: Introductionmentioning

confidence: 99%

Confinement of Vibrotactile Stimuli in Narrow Plates

Dhiab

Hudin

2019

2019 IEEE World Haptics Conference (WHC)

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On a touch surface, providing a local vibrotactile feedback enables multiusers and multitouch interactions. While the vibration propagation usually impedes this localization, we show in this paper that narrow strip-shaped plates constitute waveguides in which bending waves below a cutoff frequency do not propagate. We provide a theoretical explanation of the phenomenon and experimental validations. We thus show that vibrations up to 2 kHz are well confined on top of the actuated area with vibration amplitude over 1 µm that can be felt by the fingers. The principle was validated with piezoelectric actuators of various shapes and a vibration motor.

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Haptics by time reversal of elastic waves

Cited by 6 publications

References 8 publications

Modeling and Experimental Evaluation of Haptic Localization Using Electrostatic Vibration Actuators

Modeling and Experimental Evaluation of Haptic Localization Using Electrostatic Vibration Actuators

Sparse Actuator Array Combined with Inverse Filter for Multitouch Vibrotactile Stimulation

Confinement of Vibrotactile Stimuli in Narrow Plates

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