著者

水上 陽介 澤田 秀之

出版者

情報処理学会

雑誌

情報処理学会論文誌 (ISSN:18827764)

巻号頁・発行日

vol.49, no.12, pp.3890-3898, 2008-12-15

被引用文献数

3

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本稿では,形状記憶合金糸を振動アクチュエータとして利用した新しい触覚ディスプレイを提案し,各アクチュエータを駆動するパルス信号を,その発生確率密度によって制御して触覚感覚を呈示する手法について述べる.著者らは糸状に加工した形状記憶合金が温度により伸縮する特性を利用し,数Hz~数100 Hzのパルス信号によって微小振動を発生する小型アクチュエータを開発し,これを触覚呈示に用いる手法を提案してきた.本研究では,複数個の形状記憶合金糸のアクチュエータを面状に配置した触覚ディスプレイの構築を行った.本アクチュエータは,パルス信号を与えることによってその周期に同期して微小振動を発生するが,ランダム発生パルスによって各アクチュエータを駆動することにより,様々な触覚感覚を呈示できることが分かった.さらに,パルス信号の発生確率密度を時間的に変化させることにより,面のテクスチャや,物体をなぞった感覚を生成できることを明らかにした.本稿では,まずこれらの触覚感覚の呈示手法について述べ,実験による本ディスプレイの有効性の評価について述べる.The paper introduces the development of a compact tactile display employing novel micro-vibration actuators using a shape-memory alloy, and describes the presentation of various tactile sensations to a human skin by the control of pulse-signal probability density given to the vibration actuators. The authors have paid attention to the super-elasticity characteristics of a shape-memory alloy formed into a thread, and have so far developed a thin tactile device by driving each actuator with pulse current signal for generating vibrations. In this study, we found novel tactile sensations presented by driving actuators with randomly generated pulse signals. This paper describes the generation of touch feelings such as texture information of objects and a rubbing sensation by controlling the signal probability density, which was evaluated by the users' experiments.

著者

水上 陽介 内田 啓治 澤田 秀之

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会技術研究報告. HCS, ヒューマンコミュニケーション基礎 (ISSN:09135685)

巻号頁・発行日

vol.106, no.83, pp.67-72, 2006-05-22

被引用文献数

1

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The paper introduces the development of a tactile device using a shape-memory alloy, and describes the information transmission by the higher-level perception such as the apparent movement and phantom sensation of the tactility. The authors paid attention to the characteristic of a shape-memory alloy formed into a thread, which changes its length according to its temperature, and developed a vibration-generating actuator electrically driven by periodic signals generated by current control circuits, for the tactile information transmission. By coupling the devices as a pair, an information transmission system was constructed for presenting the apparent movement of the tactility, to transmit quite novel sensation to a user. The information transmission by the device was tested by 10 subjects, and evaluated by questionnaires. The apparent movement was especially well perceived by users as a sensation of something running across fingers or as being tapped by something, according to the difference of signals given to the devices. Several users reported the rubbing sensation given by the AM, and we further experimented the presentation of the sensation in detail.

著者

江竜 和信 瀬戸 章文 水上 陽介 名倉 瑞紀 古内 正美 田島 奈穂子 加藤 孝晴 榎原 研正 大谷 吉生

出版者

日本エアロゾル学会

雑誌

エアロゾル研究 (ISSN:09122834)

巻号頁・発行日

vol.24, no.1, pp.24-29, 2009-03-20 (Released:2009-03-31)

参考文献数

8

被引用文献数

3

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Inertial filter, which classifies nanoparticles by inertial filtration, has been developed by Otani et al. (Aerosol and Air Quality Research, 7, 343-352 (2007) ) . The present work is aimed at formulating the fundamental design rules for the inertial filters with an appropriate cutoff size at a low pressure drop. We numerically calculated the classification performance for nanoparticles and compared the results with the experimental data obtained with TEM grids which has rigid and uniform structure as a model filter. As a result, thorough the theoretical calculation and experiments, (1) the collection efficiency of inertial filter can be successfully predicted by the conventional filtration theory based on the single fiber collection efficiency. (2) A filter with a finer fiber diameter can achieve smaller cutoff size at a lower pressure drop, however, the theoretical calculation suggested (3) an inertial filter consisting of fibers smaller than 14 μm cannot suppress the diffusional collection of nanoparticles with the diameter of 20 nm even at a filtration velocity of 30 m/s.