4 research outputs found

    Gyroscope induced force feedback for ball impact simulation in exergames.

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    A haptic feedback device for simulating batting sport haptics was designed using the resultant gyroscopic effect from rapidly reorienting spinning flywheels and integrated into a custom cricket themed virtual reality exergame. The device was capable of producing impact vibrations and a 0.1 N m torque. A within-subjects user study conducted on 16 participants, and player presence was evaluated using the Presence Questionnaire. The results of the user study were statistically insignificant due to a small sample size (p=0.153), and we were unable to reject the null hypothesis, but visual data analysis was used to identify trends that supported our hypothesis that increase haptic feedback fidelity increases presence in virtual reality batting sports exergames. Due to the statistical insignificance of these results, further research should be conducted to confirm these findings

    Conception, développement et validation expérimentale d'une boussole haptique

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    Ce mĂ©moire prĂ©sente la conception, le contrĂŽle et la validation expĂ©rimentale d’une boussole haptique servant Ă  diriger les utilisateurs aux prises avec une dĂ©ficience visuelle, et ce, dans tous les environnements. La revue de littĂ©rature dĂ©crit le besoin pour un guidage haptique et permet de mettre en perspective cette technologie dans le marchĂ© actuel. La boussole proposĂ©e utilise le principe de couples asymĂ©triques. Son design est basĂ© sur une architecture de moteur Ă  entraĂźnement direct et un contrĂŽle en boucle ouverte Ă©talonnĂ© au prĂ©alable. Cette conception permet d’atteindre une vaste plage de frĂ©quences pour la rĂ©troaction haptique. Les propriĂ©tĂ©s mĂ©caniques de l’assemblage sont Ă©valuĂ©es. Puis, l’étalonnage des couples permet d’assurer que le contrĂŽle en boucle ouverte produit des couples avec une prĂ©cision suffisante. Un premier test avec des utilisateurs a permis d’identifier que les paramĂštres de frĂ©quence entre 5 et 15 Hz combinĂ©s avec des couples au-delĂ  de 40 mNm permettent d’atteindre une efficacitĂ© intĂ©ressante pour la tĂąche. L’expĂ©rience suivante dĂ©montre qu’utiliser une rĂ©troaction haptique proportionnelle Ă  l’erreur d’orientation amĂ©liore significativement les performances. Le concept est ensuite Ă©prouvĂ© avec dix-neuf sujets qui doivent se diriger sur un parcours avec l’aide seule de cette boussole haptique. Les rĂ©sultats montrent que tous les sujets ont rĂ©ussi Ă  rencontrer tous les objectifs de la route, tout en maintenant des dĂ©viations latĂ©rales relativement faibles (0:39 m en moyenne). Les performances obtenues et les impressions des utilisateurs sont prometteuses et plaident en faveur de ce dispositif. Pour terminer, un modĂšle simplifiĂ© du comportement d’un individu pour la tĂąche d’orientation est dĂ©veloppĂ© et dĂ©montre l’importance de la personnalisation de l’appareil. Ce modĂšle est ensuite utilisĂ© pour mettre en valeur la stratĂ©gie d’horizon dĂ©filant pour le placement de la cible intermĂ©diaire actuelle dans un parcours sur une longue distance.This Master’s thesis presents the design, control and experimental validation of a haptic compass, designed as a guiding device for the visually impaired in all environments. The literature review shows that there is a need for haptic guidance and how this technology differs from current haptic devices. The proposed device uses the principle of asymmetric torques. Its design is based on a direct drive motor and a pre-calibrated open-loop control, which allows the generation of stimuli in a wide range of frequencies. The device is calibrated and its mechanical properties are evaluated to ensure that the open-loop control provides sufficient precision. A first user study presents interesting effectiveness in the frequency range 5 to 15 Hz and for torques over 40 mNm. In a second experiment, the use of a haptic feedback proportional to the anglular error is shown to significantly improve the results. An experimental validation by a group of subjects walking with the aid of the portable device in an open environment is then reported. The results show that all participants met all route objectives with small lateral deviations (0:39 m on average). The performances obtained and the user’s impressions are favorable and confirm the potential of this device. Finally, a model of the human orientation task is developed and demonstrates the importance of individual customization. A receding horizon strategy for the placement of the current target on the path is thereby proposed

    A haptic direction indicator using the gyro effect

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    none3The preliminary study described in this paper is about the assessment of the control parameters of a non-grounded haptic device giving kinaesthetic stimuli to indicate to the user a direction to follow to reach a target location. The haptic sensation is created by tilting one or more rotating flywheels along an axis, controlling the direction and the amount of tilt, the velocity of the tilt (during the pulse and the repositioning of the flywheel), the frequency of pulses. The current prototype has only one flywheel and is able to tilt along a single axis, thus indicating only “right” or “left” direction. The experiments performed with the prototype allowed us to define a set of requirements (torque produced, duration of the stimuli) for a more complex prototype (2 flywheels and 2 DOF) to be developed and tested as future work.M. Antolini; M. Bordegoni; U. CuginiAntolini, Michele; Bordegoni, Monica; Cugini, Umbert
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