著者

西内 章博 松岡 大起 平山 朋子 松岡 敬 高田 仁志

出版者

一般社団法人 日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2017, pp.A-6, 2017

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<p>Surface texturing is attracting much attention especially in the tribology field because for the effect improving the lubrication properties. However, most of studies on surface texturing conduced in the past focused the lubrication properties under a static load, and there are almost no papers on the dynamic characteristics of textured surfaces under a squeezing condition. From these backgrounds, the purpose of this research is to grasp the oil film behaviour on the textured surface under vertical vibration that simulates repeating squeeze motion. The oil film behavior under squeezing motion was observed by means of optical interferometry with two-color light. The experiment showed that the oil film shape in the contact circle under squeezing motion changed due to the existence of microdimples. Particularly, when the glass surface with 500 nm-depth microdimples was used, the oil film became thicker and the contact area became smaller than that when the non-textured surface was used.</p>

著者

添田 照夫 神谷 大揮 堀江 三喜男

出版者

一般社団法人 日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2002, pp.84-85, 2002

被引用文献数

1

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FAB (Fast Atom Beam) manufacturing is able to make a high-aspect-ratio structure. The manufacturing precision of line-and-space does not significantly decrease in the case of FAB manufacturing, when the distance between the mask and the substrate is of a limited length. In the present paper, a new method to make a line-and-space on the substrate by the use of FAB is first proposed. In this method, the mask with line-and-space is put on the substrate with slope. In the process of changing the slope of the mask, it is possible to change the line-and-space on the substrate. Next, the manufacturing process of the mask to make a nano-meter-order line-and-space on the substrate by the use to the FAB etching is proposed. Moreover, the mask is manufactured by the use of FAB and its performance during manufacturing is discussed.

著者

内野 峻輔 佐藤 太一 中村 裕幸 五十嵐 洋

出版者

一般社団法人 日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2016, pp.G-4-2, 2016

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<p>In this study, we constructed a driving simulator and attempted to assist the driver in parallel parking by presenting auditory stimuli. For this purpose, we developed an acoustic information system that has the driver turn the steering wheel on the basis of sound-pressure differences in white noise output from left and right speakers. This system provides acoustic feedback to the driver based on deviation from the target value for steering wheel operation. First, we conducted an experiment to identify the manner in which people react to acoustic information given in this way and establish appropriate control parameters. Next, we investigated how acoustic information could affect driving characteristics in parallel parking. Furthermore, based on the parallel parking experimental results, we investigated and fixed the appropriate control parameters for each operating value of steering wheel. Even if we use the fixed control parameters, the acoustic information system is effective in providing driving support.</p>

著者

荻野 貴司 秋元 俊成 友納 正裕 松元 明弘

出版者

一般社団法人 日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2008, pp.88-89, 2008

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For the future cohabitation of humans and robots, we are making research on home use robots, where human motion and environment must be precisely recognized. We used omnidirectional mobile robot with laser range sensor for this purpose, and made experiments on map building and human following. First, we adopted scan matching algorithm for the localization of mobile robot in the stable environment, and confirmed the map building capability by experiments. Next, we applied this algorithm to the mixed environment of human and robot, and succeeded to extract human motion and robot motion along with the map building at the same time. We confirmed the adaptability of scan matching algorithm to the human motion recognition which is the key to the human following by robots.

著者

大森 隆広 碓井 隆 渡部 一雄 グェン ミンジュン 下山 勲

出版者

一般社団法人 日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2017, pp.I-4, 2017

被引用文献数

1

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Among the many types of sensors for measuring vibration, the AE sensor is designed to measure acoustic emission, i.e., small-amplitude vibration. Most AE sensors use piezoelectric material as transducers. Compared with the piezoelectric sensors, MEMS sensors have beneficial characteristics such as low cost attributable to mass production and smaller size. The SA sensor is a type of MEMS sensor and has broad frequency bandwidth. Exploiting this characteristic, the SA sensor can be used as a multifunctional vibration sensor to measure several frequency ranges conventionally measured by multiple sensors. In this paper, PLB test results measured by SA and AE sensors are evaluated by wavelet transform to investigate the applicability of the SA sensor for AE measurement.

著者

江口 健彦 河野 敬

出版者

一般社団法人日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2005, pp.190-195, 2005-03-21

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That a narrow gap between a disk and a shroud reduces disk flutter amplitude is one of the most important knowledge on disk flutter of hard disk drives. This has been explained by reduction of an airflow excitation because of blockage of a vertical flow from a side of the disk to the other side. However, we found a different phenomenon in our experiments: damping ratios of the disk flutter were increased but the mode excitations were not reduced by a narrow disk-shroud gap. In the experiments, frequency spectrums of disk flutter were measured for various disk-shroud gaps. The frequency spectrum for the narrow gap showed more rounded peaks than for the wide gap, and the amplitudes of the flat area between the peaks were approximately same in the both cases. We derived its theoretical equations from energy dissipation of a flow induced by disk flutter at a disk-shroud gap, and these equations with reasonable parameters can explain the experimental results very well. So, the mechanism of the aerodynamic damping was confirmed. According to the equations, damping ratios of disk flutter due to the aerodynamic damping are inversely proportional to cube of a disk-shroud spacing normalized by an outer radius of a disk. Considering a constant damping independent on disk-shroud spacing, we can get a relationship between disk flutter amplitude and disk-shroud spacing. This relationship matches the experimental results with various disk sizes that had been reported.

著者

佐藤 太一 尾山 敬一 小林 春美 田中 基八郎

出版者

一般社団法人日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2005, pp.320-325, 2005-03-21

被引用文献数

1

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We have performed basic experiments for the purpose of applying onomatopoeia to engineering problems. In these experiments, test subjects were made to perform lifting actions while listening to onomatopoeic utterances. We thereby demonstrated that there is a relationship between the onomatopoeic utterances and the lifting forces exerted by the test subjects. We examined how the lifting forces are related to the magnitude of the onomatopoeic utterances and the envelope of these sounds. Furthermore, by comparing this phenomenon with the effects of simple tones and white noise, we investigated how the lifting force is affected depending on whether or not emotion is expressed when uttering the onomatopoeia.

著者

栗田 昌幸 徐 鈞国 徳山 幹夫 中本 一広 三枝 省三 丸山 洋治

出版者

一般社団法人日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2005, pp.154-155, 2005-03-21

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The rapid increase in the recording density of magnetic disk drives has required decreasing the flying height of magnetic head sliders to approximately 10nm. Under such low flying height conditions, however, the heat generated by the high-frequency current in the writer coils and the rise in the ambient temperature both cause local protrusion of head elements. Such protrusion reduces the flying height below the design value, thus reducing the safety margin for head/disk interference. To analyze this problem, the heat transfer in the head slider, the thermal deformation of the head, and the flying height changes of the slider due to the deformation were numerically simulated. The parameter study showed that short pole and shields cause a smaller ambient-temperature-induced protrusion but a larger write-current-induced protrusion, i.e., a trade-off relationship exists.

著者

大瀧 保明 鈴木 明宏 張 秀敏 佐川 貢一 永富 良一 猪岡 光

出版者

一般社団法人日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2005, pp.341-344, 2005-03-21

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Main objective of this study is to evaluate physical activity by means of a portable device utilizing accelerometers and a barometer. A simple and effective algorithm was proposed to classify physical activities including vertical movements such as stair climbing, and estimates its exercise intensities. The propose method performed successful classifications and feasible estimation of the energy consumption in the experimental study comparing with the measured values of the expiratory gas monitoring system. The result suggested that the correct evaluation of vertical movements made an improvement in the estimation of energy consumptions, which provides better assessment in physical therapies.

著者

小林 亮介 澤 洋一郎

出版者

一般社団法人日本機械学会

雑誌

IIP情報・知能・精密機器部門講演会講演論文集

巻号頁・発行日

vol.2002, pp.107-110, 2002-03-22

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A new type of a folding electric wheelchair is proposed. It can be moved on a flat floor with the omni-directional motion and it is easily transportable because of the light framework body and the equipment of a simple drive mechanism two sets of the powered wheel steering and drive unit are mounted on the front and the rear positions of the chassis like a skate board. This paper deals with the prototype of the wheelchair developed for design of the motion control system and determination of the specifications on the new type one.