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Smooth Vibrotactile Flow Generation Using Two Piezoelectric Actuators
Jan.-March 2012 (vol. 5 no. 1)
pp. 21-32
Jeonggoo Kang, Dept. of Mechatron., Gwangju Inst. of Sci. & Technol., Gwangju, South Korea
Jongsuh Lee, Dept. of Mechatron., Gwangju Inst. of Sci. & Technol., Gwangju, South Korea
Heewon Kim, Dept. of Mechatron., Gwangju Inst. of Sci. & Technol., Gwangju, South Korea
Kwangsu Cho, Dept. of Interaction Sci., Sungkyunkwan Univ., Seoul, South Korea
Semyung Wang, Dept. of Mechatron., Gwangju Inst. of Sci. & Technol., Gwangju, South Korea
Jeha Ryu, Dept. of Mechatron., Gwangju Inst. of Sci. & Technol., Gwangju, South Korea
This paper proposes a method for generating a smooth directional vibrotactile flow on a thin plate. While actuating two piezoelectric actuators spatially across the plate, temporal sweeping of the input excitation frequency from zero to the first mode of the resonance frequency can smooth the perceived directional vibrotactile flow, as compared to a vibrotactile flow generated by conventional apparent tactile movement and phantom sensation methods. In order to ascertain important factors in the excitation pattern, a user study was conducted for three factors (amplitude (constant versus modulated), frequency (constant versus swept), and ending shape (sharp versus smooth)). The results showed that frequency sweeping in addition to amplitude modulation and smooth ending were the most important factors in smoothing vibrotactile flows. Moreover, an excitation signal with a smooth ending shape was important for generating nonspiky flows at the midpoint. In this study, a vibration isolation design is also proposed in order to substantially decrease the transmission of the actuator vibration to the mockup housing. As such, it is expected that the proposed vibrotactile flow generation method and vibration isolation design may be useful in applications including generating directional information in navigation maps or for identifying callers in mobile devices.

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Index Terms:
vibration isolation,cartography,haptic interfaces,mobile computing,piezoelectric actuators,vibrotactile flow generation method,smooth vibrotactile flow generation,piezoelectric actuator,input excitation frequency,resonance frequency,perceived directional vibrotactile flow,apparent tactile movement,phantom sensation method,excitation pattern,user study,amplitude factor,frequency factor,ending shape factor,frequency sweeping,amplitude modulation,smooth ending,vibration isolation design,actuator vibration,directional information,navigation map,mobile device,Vibrations,Resonant frequency,Piezoelectric actuators,Frequency modulation,Shape,Trajectory,mobile device.,Vibrotactile flow,vibration isolation,piezoelectric actuator
Citation:
Jeonggoo Kang, Jongsuh Lee, Heewon Kim, Kwangsu Cho, Semyung Wang, Jeha Ryu, "Smooth Vibrotactile Flow Generation Using Two Piezoelectric Actuators," IEEE Transactions on Haptics, vol. 5, no. 1, pp. 21-32, Jan.-March 2012, doi:10.1109/TOH.2012.1
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