著者

エッカシット イントゥティパワン 飯島 健 道辻 洋平 ポンサトーン ラクシンチャラーンサク 吉田 秀久 永井 正夫

出版者

一般社団法人日本機械学会

雑誌

交通・物流部門大会講演論文集

巻号頁・発行日

vol.2005, no.14, pp.339-340, 2005-12-06

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This paper describes a part of incident situation of driver especially on vehicle sideslip situation. Nowadays, many researches aiming to develop the driving assistance system for decreasing traffic accidents are being conducted, but the best way to deal with this problem is to study about the main source of the accidents, that is driver. This research focuses on the driving behavior while doing double lane change and when the road friction is reduced suddenly by using driving simulator, which can be recorded to analyze the pattern of incident so that if the behavior that driver is going to do can be analyzed, the event that will be occurred can be predicted. Data are collected and used to find out the causes of incidents and the factors informing about the car spinning out of the course. In future, all of data will be used to synthesize the assistance system for assisting driver before accident happens.

著者

丸茂 喜高 山﨑 光貴 鈴木 宏典 道辻 洋平

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.50, no.4, pp.1145-1150, 2019 (Released:2019-07-25)

参考文献数

9

被引用文献数

1

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本研究は,信号交差点における安全性と燃費を向上させる運転支援システムについて検討した.現在の速度を維持した場合に,交差点進入時に予想される信号現示を道路上に仮想的に呈示する運転支援システムについて,ドライビングシミュレータ実験により検証した結果,安全性や燃費が向上することを確認した.

著者

山口 泰平 道辻 洋平 牧島 信吾 髙橋 諭

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.88, no.905, pp.21-00277, 2022 (Released:2022-01-25)

参考文献数

14

被引用文献数

1

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Wheel slips in railway vehicles cause poor acceleration and damage to wheels and rails. Re-adhesion control is widely used to resolve wheel slips in electric motor cars. In re-adhesion control, it has been an important problem to consider appropriately the vehicle dynamic motion, which affects the control performance greatly. In this study, we investigate the mechanism and characteristics of slip misdetection phenomena which occur due to bogie vibration excited during re-adhesion control. We construct a three-dimensional vehicle model including roll motion with parallel Cardan drives. The tangential force coefficient model between wheels and rails includes the influence of translational velocity, slip velocity and wheel loads. The simulation model is validated by comparison with measurements in a test run of a real vehicle conducted in previous research. Simulation results illustrate the behavior of the bogie under traction such as the difference of wheel loads of four wheels and the attitude of the bogie frame. It is shown that continual slip misdetection can occur because of pitch and roll vibration of the bogie frame which is excited during re-adhesion control when the primary vertical damping coefficient is small. The misdetection is prevented by changing the amount of motor torque reduction in re-adhesion control. The appropriate range of the amount of reduction to avoid the misdetection gets narrower as the primary vertical damping coefficient decreases. The primary vertical suspension stiffness and characteristic of tangential force coefficient also affect the occurrence of the misdetection.

著者

貞弘 晃宜 道辻 洋平 山北 昌毅

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

巻号頁・発行日

vol.2002, 2002

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本論文で考えるアクロバット・ロボットは平面5リンク4アクチュエーターの人間を模した多自由度・多関節のロボットであり, 一端をアクチュエータを持たない自由回転できる鉄棒に固定することにより, 鉄棒の体操選手をモデル化したものとみなせる.このような非ホロノミックシステムに対して, エネルギーと姿勢を同時に目標状態に安定化する周期エネルギー制御により, 着地を行う為に必要な飛出時の並進速度と角運動量を制御する.

著者

道辻 洋平 石井 翔 長澤 研介 松本 陽 大野 寛之 佐藤 安弘 緒方 正剛 谷本 益久 岩本 厚 福島 知樹 品川 大輔

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.83, no.856, pp.17-00283-17-00283, 2017 (Released:2017-12-25)

参考文献数

15

被引用文献数

5

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It is important to secure running safety of railway vehicles against wheel-climb derailment accidents. The safety is often discussed according to the value of derailment coefficients for the leading outside wheel of a railway bogie running on sharp curves. Therefore, the detailed force induced mechanism which influences the value of derailment coefficients should be clarified. One of the most dominant factors affecting the value of derailment coefficients is magnitudes of the coefficient of friction (COF) between wheel and rail. Since the gauge corner of the outer rail and the top of the inner rail are lubricated at some sharp curves, COF of wheels of a bogie are different from each other and show complicated variation. In this study, the effect of lubrication for the running safety of the railway bogie is investigated while considering the detailed force induced mechanism of the derailment coefficient increase utilizing both multibody dynamics simulations and experiments. Experiments and simulations are conducted with a roller-rig test equipment under various conditions of wheel/rail lubrication. In this research, a method to identify whether the bogie is in suitably lubricated condition in terms of running safety is discussed. The proposed method making use of the longitudinal force measurement with mono-link type axle supporting device is mentioned.

著者

高梨 宏之 阿部 勝哉 道辻 洋平 小竹 元基 ポンサトーン ラクシンチャラーンサク 林 隆三

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.83, no.855, pp.17-00224-17-00224, 2017 (Released:2017-11-25)

参考文献数

16

被引用文献数

2

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This paper describes a modeling method for predicting a walking route of a pedestrian in a stochastic manner. We consider one of the most typical situations where a pedestrian walks along to a sidewalk, and then some obstacle exists in front of the pedestrian. To represent the walking route of the pedestrian during the avoidance action, a stochastic model is suitable than deterministic one. The stochastic model is derived from the walking experiment where a pedestrian avoids some obstacle in natural walking. Based on the loci obtained from the experiment, the pedestrians walking speed and walking direction at any local area was approximated by Gaussian and Beta distribution function, respectively. As a result the walking route of a pedestrian can be represented in a stochastic manner. The estimated output of the model is examined by comparing with two real walking loci that were obtained from near-miss incident database. One examination scene is avoidance of a parked vehicle, and the other is of parked bicycle on the roadside. By the numerical simulation, we obtained the results that the both real walking routes are included within the 3-sigma ranges of the estimated output of 500 trials.

著者

道辻 洋平 志賀 亮介 須田 義大 林 世彬 牧島 信吾

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.83, no.851, pp.17-00068-17-00068, 2017 (Released:2017-07-25)

参考文献数

17

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It is important for railway bogies to get compatibility between curving performance and running stability. Utilizing independently rotating wheels may be an effective solution. The EEF bogie proposed by Dr.Frederich in late 1980th shows good curving performance making use of the gravity restoring force generated by the tread gradient of independently rotating wheels. However, the bogie gives rise to a kind of hunting motion as the vehicle running velocity increases. In this paper, an effective modification of the EEF bogie which solves the hunting motion is mentioned. The solution is to incline both wheel-axles while adjusting the tread shape of each wheel. In this paper, the EEF bogie with inclined wheel-axles is firstly proposed and analytically evaluated by the MBD simulation. Since the newly proposed bogie has complicated structures, a precise modeling of the bogie is mentioned in detail. From the result of eigenvalue analysis, proposed bogie can dramatically improve the hunting stability as compared to the conventional EEF bogie. In addition, the proposed bogie has excellent curving performance in tight curve section equivalent to the conventional EEF bogie. As those results, it is possible to achieve both high speed hunting stability and curving performance utilizing the proposed bogie unit in the vehicle.