| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 2002: ¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 2001: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Research Abstract |
1. Objective
Conventional haptic interface devices for virtual space interaction have limitations, for instance, those devices do not have performance to display the softness of virtual objects in passive touch motion. In this study, an innovative softness display device was developed based on the result of human motion analysis for softness perception. An experimental system to share the sense of softness over network has also implemented.
2. Projects and results
The human pinch motion to perceive the softness of objects was analyzed experimentally. It was found that the peak contact area is constant in despite of the object softness, and that tendency can be explained by the constant imaginary displacement hypothesis.
Based on the constant contact area tendency, a softness display device was developed, which controls the contact area between the finger and the device dynamically. The distinguish rate between four virtual objects were ninety-four percent and the cognitive rate of the four
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virtual objects compare to the original object was seventy-five percent. The feasibility of softness display by contact area control was demonstrated.
An experimental softness-sharing system was constructed using two computers with fingertip force-display devices over UDP/IP network. The transmitted reaction force from the object was displayed by the force-display and the fingertip displacement was displayed by the CRT monitor without the restriction of fingers positions. It was demonstrated that the distinguish among 50, 100, 200, 400 N/m softness is possible.
3. Concluding remarks and future work
The feasibility of softness display by contact area control, which was developed based on the experimentally found tendency of human pinch motion for softness perception, was demonstrated. The feasibility of remote sharing of softness sense using force-displays over network was also demonstrated. The further study for applying these results on remote cooperation such as telerehabilitation is required. Less
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