| Co-Investigator(Kenkyū-buntansha) |
NISHIMATSU Toyonori Shinshu University, Textile Science and Technology, Professor, 繊維学部, 教授 (40252069)
SADOYAMA Tsugitake Shinshu University, Textile Science and Technology, Professor, 繊維学部, 教授 (70273076)
SHIMIZU Yoshio Shinshu University, Textile Science and Technology, Professor, 繊維学部, 教授 (20150675)
眞野 倖一 信州大学, 繊維学部, 教授 (90047150)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,700,000)
Fiscal Year 2004: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2003: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Research Abstract |
[Purpose]
The purpose of this study is the numerical analysis of finger motion in the tactile evaluation process, for such purpose of determining resilience, roughness, flexibility and softness. The subjects were initially assigned to one of three groups according to how well they able to discriminate between items using their bare hands. This was considered an important factor, because we hypothesized that those who were more adept at this discrimination may also use a different finger motion from those who were less adept. Each group then used the same sensor glove. We obtained data such as the applied force through the sensors, and analyzed the differences in finger motion according to type of evaluation. Then with the sensor glove, we were able to identify finger motion between the three groups, and conclude that finger motion varied according the type of evaluation as well as to the group each subject was initially assigned.
[Experiment]
We developed a new glove-type measurement syst
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em constructed with twenty pressure sensor sheets (one sheet size : 1.8x1.7cm) with four rows and four columns unit cells. The subjects wore the glove on their right hand, as shown in Figure 1. With their eyes closed, they evaluated the hand of a non woven fabric for 10 seconds. At each step subjects were directed to evaluate the hand of cloth in accordance with a specific purpose, such as evaluating for resilience, roughness, bending flexibility and softness. A total of 30 subjects were used in the experiment, fifteen men and fifteen women who were all between 20-29 years of age.
We obtained data from the sensor-glove concerning applied force(g/cm2), which is the average of the pressure values recorded by the sensors. From this we further analyzed three kinds of physical data. The first was the coefficient of variation of the applied force, hereafter referred to as C.V.A.F. The second was the range of the center of applied force, hereafter referred to as R.C.A.F.
[Results]
From our research, we can make the following conclusions.
(1)More sensitive humans move their fingers with less applied force and a higher C.V.A.F. They also showed finger motion characterized by varied movement over short distances.
(2)More sensitive humans rely more on their index finger for evaluation than their thumb. Less sensitive humans tend to rely almost entirely on their thumb in evaluating the hand of cloth.
(3)To evaluate resilience, the subjects palpated the cloth with a high applied force and a low variation. The analysis of R.C.A.F. yielded similar results. This means that the human moved their fingers both vertically and statically.
(4)To evaluate roughness, humans palpated the hand of loth with a low applied force but at high variation. This means that humans move their fingers horizontally and dynamically.
(5)Humans can easily understand how to evaluate roughness and resilience. We concluded that in defining the characteristics of finger motion, the amount the subject knew about each evaluation process was a very important factor.
Through the pressure sensor, we observed that subjects had specific characteristic of finger motion when they evaluated the hand of cloth about resilience and roughness. Thus, we conducted that subjects can evaluate the hand of loth in a manner commensurate with their understanding of the purpose of evaluation. Less
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