著者

谷 一郎

出版者

一般社団法人 日本機械学会

雑誌

機械學會誌

巻号頁・発行日

vol.36, no.196, pp.574-575, 1933

著者

松永 雅樹 笠井 尚哉 アグン レペリアント レ チュン トラン 関野 晃一

出版者

一般社団法人 日本機械学会

巻号頁・発行日

pp.OS-4, 2019 (Released:2020-06-25)

著者

伊藤 史斗 長谷 和徳 内田 和男

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 (ISSN:21879761)

巻号頁・発行日

vol.85, no.878, pp.19-00191, 2019 (Released:2019-10-25)

参考文献数

15

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The frame stiffness in a racing bicycle might influence not only toughness as the frame structure but also performance of an athlete. The purpose of this study is to clarify biodynamic relations between the frame stiffness in a racing bicycle and the physical loads of an athlete by using a forward dynamics simulation model. The human body structure was represented by the 13-rigid-links and 23-degrees-of-freedom model. Based on the theory of multibody dynamics, the frame structure was expressed by combination of 12 rigid pipes, and the frame stiffness was modeled by rotational springs at the connecting joint between the rigid pipes. Spring coefficients were changed according to the thickness of the frame pipes. The pedaling load from the crank was computed by the angular velocity and angular acceleration of the crank. Moreover, the driving force in the bicycle was additionally defined to consider the influence of the frame weight on the human joint load. The human body model was driven by the joint toques to minimize the cost function consisting of the joint loads in the human body and the driving force in the bicycle, and also to keep desired angular velocity of the crank. Validity of the simulation was evaluated by comparing the joint angles and torques with the measured ones. As for the result, the larger stiffness of the frame resulted in smaller the joint loads in the human body, and optimal stiffness would be determined by the balance between the joint loads in the human body and the driving force in the bicycle.

著者

佐藤 準一

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 C編 (ISSN:03875024)

巻号頁・発行日

vol.64, no.627, pp.4109-4114, 1998-11-25 (Released:2008-02-26)

参考文献数

32

著者

原口 真 林 高史 三木 史也

出版者

一般社団法人 日本機械学会

雑誌

北陸信越支部総会・講演会 講演論文集 2017.54 (ISSN:24242772)

巻号頁・発行日

pp.N041, 2017 (Released:2017-06-19)

著者

木村 佳記 小柳 磨毅 中江 徳彦 田中 則子 向井 公一 佐藤 睦美 小川 卓也 横谷 祐一郎

出版者

一般社団法人 日本機械学会

雑誌

バイオエンジニアリング講演会講演論文集 2012.24 (ISSN:24242829)

巻号頁・発行日

pp._8B14-1_-_8B14-2_, 2012-01-06 (Released:2017-06-19)

著者

俵 國一

出版者

一般社団法人 日本機械学会

雑誌

機械學會誌 (ISSN:24331546)

巻号頁・発行日

vol.22, no.54, pp.1-39, 1918 (Released:2017-08-01)

被引用文献数

1

著者

森 みどり 中易 秀敏 三好 哲也

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.79, no.803, pp.2408-2423, 2013 (Released:2013-07-25)

参考文献数

21

被引用文献数

1 1

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In order to keep a highly safe and reliable system of car driving, it is important that the system would be considered as a man-machine system including not only the feature of vehicle movement but also human perception, cognition, and motion of a driver. In this paper, it is examined to clarify the relation between feature of eye movements and driving behavior in conventional and unconventional situation by the experiments using the driving simulator and the eye tracking system. The measurements of time histories of eye movements were performed in the situation of different traffic regulation by the simulator. It is recognized in both turns that typical patterns of eye movements in horizontal axis appeared between the start and end of the turns. It is found from the time histories of eye movements by synchronizing that of vehicle data that the appearances of fixations were distributed uniformly on the trajectories of vehicle by trained drivers from the start of turning to the end, while the appearance of fixation by untrained drivers are concentrated in the beginning of turning or the end. These facts mean that the untrained driver did not receive visual information during the operation of turning, therefore the trajectories of vehicle by untrained driver showed the overshooting in the right turn and undershooting in the left turn.

著者

磯部 孝

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:24242675)

巻号頁・発行日

vol.82, no.731, pp.1087-1090, 1979-10-05 (Released:2017-06-21)

著者

今井 健太 北村 光司 西田 佳史 竹村 裕 杉本 裕

出版者

一般社団法人 日本機械学会

雑誌

ロボティクス・メカトロニクス講演会講演概要集 2015 (ISSN:24243124)

巻号頁・発行日

pp._1A1-W02_1-_1A1-W02_4, 2015-05-17 (Released:2017-06-19)

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A large number of injuries were occurred in Japanese school environments. To prevent school injuries, it is important to understand accident situations and prioritize intervention targets. However, it is difficult for a risk manager of each school to do this since each school does not have data enough for statistical analysis. In this study, we developed the system that allows to grasp serious accident situations by integratively utilizing data distributed in multiple schools. The developed system finds serious accident situations that a school risk manager should know as follows. First, the system registers situational feature vectors for accident situations data by using a textmining technology. Second using the database, it searches accidents situations similar to the actually occurred situations. Finally it shows most expensive accidents using medical cost data. The effectiveness of the system was confirmed using 5,817 school injury data.

著者

佐藤 祐 橋 弘矩 若林 雄介 永瀬 和彦

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.73, no.725, pp.59-65, 2007-01-25 (Released:2011-03-04)

参考文献数

8

被引用文献数

1 1

---

The authors proposed a new method which could easily and precisely detect the contact point position between the rail and the wheel under the critical condition of wheel climb derailment. As the result of the experiment using the above mentioned method, they found that the position was variously changed according to rail attack-angles and wheel lift-up values from the rail tread. The next, employing the contact point position, a new conception was proposed to theoretically calculate the wheel lift-up value from the rail tread when a wheel climb derailment occurred. Using a model track and a model truck, experimentation was done to examine the difference between the theoretically calculated value and the practically measured one on the wheel lift-up value. The result obtained was very much in agreement with the theoretically calculated value and the practical lift-up one.

著者

武藤 昌也 坪倉 誠 大島 伸行

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:18848346)

巻号頁・発行日

vol.77, no.775, pp.781-792, 2011 (Released:2011-03-25)

参考文献数

14

被引用文献数

1

---

Flow characteristics and fluid force on a sphere rotating along with axis perpendicular to mean air flow were investigated using Large Eddy Simulation (LES) at two different Reynolds numbers Rep of 1.0×104 and 2.0×105. As a result of simulation, opposite flow characteristics around the sphere and displacement of the separation point were visualized depending on the Reynolds number even though rotation speed according to the Reynolds number is the same. When the sphere rotates at some specific rotation velocity and at Rep = 1.0×104, flow characteristics agree with the flow field explained in the Magnus effect. While sphere rotates at the same rotation velocity while increasing Rep to 2.0×105, separation point moves in opposite direction and wake appears in the different direction. The reason of the negative Magnus force was discussed in terms of the boundary layer transition on the surface.

著者

友永 聖樹 太田 俊介 神代 充 笹木 亮 池本 有助

出版者

一般社団法人 日本機械学会

雑誌

ロボティクス・メカトロニクス講演会講演概要集 2014 (ISSN:24243124)

巻号頁・発行日

pp._2A1-G05_1-_2A1-G05_2, 2014-05-24 (Released:2017-06-19)

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Robots are expected to play an important role in social welfare and service for older citizens. These robots are required to generate embodied interactions for greetings in order to be able to smoothly coexist and cooperate with humans. A hug motion is one of the important embodied interactions. Therefore, in this study, we develop a hug motion generation model based on analyses of human hug motions. In this model, a hug motion of a robot is generated by using a bell-shaped and a wave-shaped velocity pattern in which accelerations and velocities have smooth changes. As a result, this model can generate a hug motion similar to motions of humans.

著者

山下 雅道 橋本 博文 佐々木 正己 宇宙農業サロン

出版者

一般社団法人 日本機械学会

雑誌

バイオエンジニアリング講演会講演論文集 2010.23 (ISSN:24242829)

巻号頁・発行日

pp.425-426, 2011-01-07 (Released:2017-06-19)

著者

棚澤 一郎

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会誌 (ISSN:24242675)

巻号頁・発行日

vol.96, no.890, pp.74-76, 1993-01-05 (Released:2017-06-21)

参考文献数

4

著者

嶋本 譲 岡 実 田中 豊

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 (ISSN:00290270)

巻号頁・発行日

vol.43, no.371, pp.2726-2737, 1977-07-25 (Released:2008-03-28)

参考文献数

8

被引用文献数

2

著者

奥茂 洸一 髙橋 祐衣 金 太成 二川 秀史 細井 厚志 川田 宏之

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 (ISSN:21879761)

巻号頁・発行日

pp.19-00029, (Released:2019-06-03)

参考文献数

23

被引用文献数

1

---

Carbon nanotubes (CNT) have remarkable mechanical properties and low density. Since length of the CNT is limited, CNT yarn is regarded as a reinforced fiber of carbon fiber reinforced plastics. However, the CNT yarn does not have remarkable mechanical properties such as the individual CNT. The most popular way for improving the mechanical properties of the CNT yarn is to make composites with polymer such as polyvinyl alcohol or polyimide. If some functional groups such as carboxyl groups are introduced on the surface of CNTs, interaction between the CNTs and the polymer is improved and high mechanical properties will be obtained. In this study, untwisted CNT yarns were prepared by drawing vertical aligned CNTs through a die and functionalized with mixed acid. Mixed acid introduced not only the functional groups but also defects on the surface of CNTs. For reducing the defects, the CNT yarn was graphitized at a temperature of 2800°C before the mixed acid treatment. By the graphitization treatment, crystallinity of the CNT yarn was improved and amorphous carbon was removed. As a result of XPS analysis, a graphitized CNT yarn treated with mixed acid did not contain the functional groups. On the other hand, a graphitized CNT yarn treated with hot mixed acid (90°C) contained the functional groups. Crystallinity of this yarn was 4.5 times higher than the as-received CNT yarn. In addition, as a result of single fiber tensile tests, tensile strength of this yarn was increased by 79 % and Young’s modulus was increased by 173 % compared to the as-received CNT yarn.

著者

神保 佳典 高比良 裕之 小林 一道 安田 章宏

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.76, no.762, pp.219-229, 2010-02-25 (Released:2017-06-09)

参考文献数

17

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The growth and collapse of a bubble under a floating body are simulated by using the boundary element method with linear elements to predict the damage of ship bodies induced by underwater explosion. The three-dimensional deformation of the bubble, the translation and rotation of the floating body, and the motion of water surface are taken into account in the simulation. It is shown that the bubble deforms three-dimensionally, and the liquid jet threads the bubble due to the interactions among the bubble, the floating body, and the water surface; the directions of the bubble translation and the liquid jet depend on the initial location of the bubble. The Kelvin impulse is found to be useful in evaluating the translational motion of the bubble. Also, the horizontal translational motion of the bubble is much dependent on the rotational motion of a floating body; when the moment of inertia of the floating body is small, the largest horizontal translation is realized between the axis of flotation and the edge of the floating body. It is also shown that there exists an initial horizontal bubble location where the moment of force acting on the floating body has the maximum value.

著者

後藤 健太郎 村山 英晶

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 (ISSN:21879761)

巻号頁・発行日

pp.19-00034, (Released:2019-06-19)

参考文献数

22

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The Lean Automobile is a minimalistic tilting personal mobility for urban transportation with the suspension device equipped with a mechanism which converts driver’s actuation force into lean moment. We proposed it as a solution for the urban traffic problems and conduct study of it aiming for societal implementation. Since the most distinctive feature of the Lean Automobile among the other micro mobilities is its lean control method that is enabled by the unprecedented suspension device, we need to focus on the lean motion dynamics in order to verify the feasibility of the lean control left in the hands and feet of the driver. In this paper the process and outcomes of the feasibility study based on the calculations of transient characteristics and the simulations of lean motion is discussed. A newly developed dynamic model which describes the tilting vehicle with the suspension device equipped with the mechanism generates lean moment is used for the calculations and simulations. Through the study we find out the conditions to stabilize weave mode along with the differences between multiple lean control tactics that is allowed by the distinctive suspension device, therefore we get the prospect that there is multiple tactics to stabilize the Lean Automobile’s lean motion along with avoiding rollover.

著者

四谷 智義 金崎 雅博

出版者

一般社団法人 日本機械学会

雑誌

設計工学・システム部門講演会講演論文集 2010.20 (ISSN:24243078)

巻号頁・発行日

pp._1405-1_-_1405-6_, 2010-10-27 (Released:2017-06-19)

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In this research, modified PARSEC airfoil representations are developed and they are investigated by the design exploration of airfoils for the Mars airplane. The existent PARSEC airfoil representation method is useful for the aerodynamic optimization and the knowledge discovery, because the original PARSEC airfoil is parameterized based on the aerodynamic theory. In this method, designer can directly define airfoil's parameters, the leading edge radius, the maximum thickness, the maximum camber, and so on, However, the original PARSEC representation cannot use for not subsonic flow (supersonic flow, low Reynolds number flow), because it was parameterized in consideration of a subsonic wing. To solve the several airfoil design problem, modified representation method is constructed and its design performance is investigated by solving multi-objective design problem. This study employs Genetic Algorithm (GA) for exploration of the multi-objective problem. Flowfield is solved by the structured Navier-Stokes solver with Baldwin-Lomax turbulent model. According to these results, the modified airfoil representation method can solve the design problem under the Martian atmosphere better than the original method.