著者

面田 雄一 中島 求

出版者

一般社団法人 日本機械学会

雑誌

Dynamics & Design Conference

巻号頁・発行日

vol.2004, pp._706-1_-_706-6_, 2004

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The objective of this study is to clarify the principle of the most stable position in the skydiving freefall. As the first step, the simulation method to analyze the dynamic behavior for freefall has been developed by the authors. In this report, an optimizing calculation to maximize an objective function with respect to the stability in the freefall is conducted. It is found that the most stable position becomes arched one. Next, the simple configuration that consists of 20 cylinders is optimized, and the angle to maximize restoring moment about each cylinder element is calculated and compared with optimized angle.

著者

中島 求 面田 雄一

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 B編 (ISSN:03875016)

巻号頁・発行日

vol.73, no.734, pp.2010-2017, 2007

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The objective of this study was to develop a simulation method for analysis of body behavior in skydiving freefall and to clarify the most stable body position during the freefall. The details of the developed simulation method were firstly described. Using the simulation method, we conducted an optimizing calculation to maximize an objective function with respect to the stability in the freefall. It was found that the most stable position became arched one. In order to clarify the reason why the most stable position became arched, optimization with respect to a simple shaped object which consists of 20 cylinders was conducted. Then the angle to maximize the restoring moment for each cylinder element was analytically calculated and compared with the optimized angle. From the results, we conclude that the most stable position becomes arched mainly since the restoring moment at each part itself becomes maximum at that angle. We also conclude that the magnitude of the arch in the most stable position is determined by the ratio of the normal and tangential drag coefficients.

著者

面田 雄一 岩城 亮 安部 原也 小川 伯文

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.51, no.2, pp.353-359, 2020 (Released:2020-02-13)

参考文献数

9

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本研究では,熟練や若年などの運転者属性(技量差)と潜在的な衝突リスクに備えた走行方法との関係を明らかにするために,自転車追い抜きシーンに着目した走行実験を実施した.本稿では,交通環境要因として駐車車両を配置した条件や自転車がふらつき走行する条件で,自転車に対する潜在的な衝突リスクを分析した.

著者

中島 求 面田 雄一

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. B編 (ISSN:03875016)

巻号頁・発行日

vol.73, no.734, pp.2010-2017, 2007-10-25

被引用文献数

1

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The objective of this study was to develop a simulation method for analysis of body behavior in skydiving freefall and to clarify the most stable body position during the freefall. The details of the developed simulation method were firstly described. Using the simulation method, we conducted an optimizing calculation to maximize an objective function with respect to the stability in the freefall. It was found that the most stable position became arched one. In order to clarify the reason why the most stable position became arched, optimization with respect to a simple shaped object which consists of 20 cylinders was conducted. Then the angle to maximize the restoring moment for each cylinder element was analytically calculated and compared with the optimized angle. From the results, we conclude that the most stable position becomes arched mainly since the restoring moment at each part itself becomes maximum at that angle. We also conclude that the magnitude of the arch in the most stable position is determined by the ratio of the normal and tangential drag coefficients.