著者

鈴木 利雄 川治 健一 関口 理希 石川 智士 伊藤 智博 立花 和宏

出版者

科学・技術研究会

雑誌

科学・技術研究 (ISSN:21864942)

巻号頁・発行日

vol.5, no.1, pp.123-1128, 2016 (Released:2016-07-07)

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関東大震災をきっかけに固定電話網の整備のためにダイヤル式電話機と自動交換機の技術のニーズは生まれ、黒電話が産声を上げた。終戦を経て高度成長期に黒電話の完成版600型が世に姿を表した。電電公社がダイヤル自動化100 %を目指す中、日本はオイルショックの狂乱物価に見舞われた。黒電話の製造コストを下げるため、完成されたと言われた黒電話600型をさらに改善することを余儀なくされた。山形大学工学部電気工学科を卒業して間もない鈴木を中心として山形県米沢市の田村電機で黒電話601A型ダイヤル開発が行われた。新しく開発された黒電話601A型は日本の家庭を電話で隅々までつないだといっていい。本稿はその開発の状況がいかがなものであったか時代背景とともに書き残すものである。

著者

中田 耕太郎 新谷 篤彦 伊藤 智博 中川 智皓

出版者

一般社団法人 日本機械学会

雑誌

関西支部講演会講演論文集

巻号頁・発行日

vol.2019, 2019

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<p>This paper deals with response behavior and rollover resistance of heavy duty truck in cornering. We focus on the connection type vehicle that consists of one tractor and one trailer. The vehicle is expressed by 7 nonlinear equations of motion and 2 constraint conditions of connecting point. The equations include the nonlinear property of the tire lateral force. We use the rate of decrease of wheel load as the index for judging rollover. We perform parameter study about the eccentric distance of center of gravity, the running speed and so on, and investigate the degree of the risk of rollover.</p>

著者

中川 智皓 森田 悠介 新谷 篤彦 伊藤 智博

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.82, no.838, pp.16-00052, 2016 (Released:2016-06-25)

参考文献数

11

被引用文献数

1

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In recent years, personal mobility vehicles (PMVs) have attracted huge attentions and widely developed. Compact PMVs can move through narrow spaces and they are expected to be used in pedestrian spaces. In this study, we aim to develop a four-wheel stand-up-type personal mobility vehicle for people who cannot walk far distantly because of the pain of foot or waist although they are able to walk for a short distance. The coupled model of human and vehicle is constructed by using multibody dynamics. In the model, the vehicle is expressed by one rigid body. The wheels, body, and handle are considered as a rigid body together. A human is expressed by 8 rigid bodies (foot, lower leg, femoral, body, head, upper arm, lower arm, and hand). The vehicle of the coupled model is accelerated in the numerical simulations. The behaviors of the center of gravity of a human with and without handle constraint are analyzed. As the result of the parametric study, it is found that the center of gravity movement is smaller when the value of the maximum acceleration and the acceleration time are small. It is also found that as the angle of the upper arm becomes large, the movement of the center of gravity is decreased.

著者

谷口 文彦 中川 智皓 新谷 篤彦 伊藤 智博

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.84, no.861, pp.17-00534-17-00534, 2018 (Released:2018-05-25)

参考文献数

11

被引用文献数

1

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Inverted pendulum vehicles controlled by movement of driver's center of gravity (COG), such as Winglet or Segway are the examples of Personal Mobility Vehicles (PMV). PMV is sometimes expected to be used in pedestrian spaces. When a driver brakes an inverted pendulum vehicle suddenly, the driver has to move his/her COG backward largely and has the risk to lose his/her balance due to the characteristics of vehicle control. Therefore, we aim to achieve a vehicle control system that is friendly to drivers in emergency. In the previous study, the coupling model of a vehicle and a human had been built on Multibody Dynamics and the technique to brake an inverted pendulum vehicle automatically had been proposed using that model. In this study, we carried out two experiments to decide the timing of the automatic braking system defined as Time To Collision (TTC). We carried out two experiments about stopping distance when a driver brakes an inverted pendulum vehicle suddenly and when the automatic braking system is operated, and we compared those results. Then, it was shown that stopping distance operated by the automatic braking system is shorter than by human driver's sudden braking operations. In addition, we derived TTC1 ( 0.7 s ) of inverted pendulum vehicles from these experiments about stopping distance by human drivers' sudden braking. Then, we derived reaction time ( 0.4 s ). Finally, we proposed a safety system using TTC1 and the reaction time. When TTC reaches 1.1[s], the alarm makes a human brake an inverted pendulum vehicle suddenly. Then if a human doesn't brake an inverted pendulum vehicle suddenly and TTC reaches 0.7[s], the automatic braking is operated.