著者

谷 裕文 大澤 正敬 伊藤 勇夫 宮田 及 明田 隆仁

出版者

公益社団法人 自動車技術会

雑誌

自動車技術会論文集 (ISSN:02878321)

巻号頁・発行日

vol.44, no.3, pp.865-870, 2013 (Released:2018-01-25)

参考文献数

3

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アイドルストップ機構搭載車両の重要課題であるクランキング音低減の検討を行い,以下のことを明らかにした.クランキング音は主にドライブプレートの面振動による放射音である.伝達系でのクランキング音低減方法としてドライブプレートの起振力の遮断と放射面積の減少を提案し,その有効性を計算と実験で確認した.

著者

木下 雅夫 蝦名 正輝 大澤 正敬 日比野 良一 門浦 弘明 秋濱 一弘

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集C編 (ISSN:18848354)

巻号頁・発行日

vol.78, no.792, pp.2824-2836, 2012 (Released:2012-08-25)

参考文献数

23

被引用文献数

5

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This paper discusses a research on 2-dimensionl visualization of a spot weld piece using laser-ultrasonic technique. This laser-ultrasonic apparatus can scan a surface on a weld piece, and get ultrasonic longitudinal signals on several hundred measurement points per 10mm order. We analyzed these signals by Frequency Response Characteristic from 10MHz to 100MHz, and showed that the ultrasonic attenuation was related to the gain, and the ultrasonic propagation velocity was related to the phase, for frequency domain spectrum. At result, it was appeared that the gain of nugget parts was less than the gain of parents, and the phase of HAZ was latter than the phase of parents and nuggets. From these results, we made maps on frequency domain spectrum, and could realize to visualize the parent and the nugget, the HAZ on a weld piece. In addition, using Electron Back Scatter Diffraction, it was shown that the gain was effected by the crystal diameters, the phase was effected by the crystal directions.

著者

西沢 博幸 大澤 正敬 大年 浩太 平手 洋 中村 俊秋

出版者

一般社団法人日本機械学会

雑誌

日本機械学会論文集 C編 (ISSN:03875024)

巻号頁・発行日

vol.60, no.572, pp.p1323-1328, 1994-04

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PID (Proportional, Integral and Derivative) control is generally used in industrial products today, because of its simple algorithm and good adaptability on the scene. However, the matching of PID control parameters is difficult, thus we are looking forward to the development of auto-tuning of PID control parameters. In this study, we attempted fuzzy auto-tuning for a gasoline engine's electronic speed controller with PID control. Here fuzzy production rules are independently applied, and each rule is weighted by the degree of inputs of assumed parts. This fuzzy reasoning method is useful in simplifying the description of fuzzy production rules and provides a simple means of control similar to that performed by humans.