著者
王 鋒 佐川 貢一 猪岡 光
出版者
Japan Ergonomics Society
雑誌
人間工学 (ISSN:05494974)
巻号頁・発行日
vol.36, no.4, pp.191-200, 2000-08-15 (Released:2010-03-12)
参考文献数
20
被引用文献数
12 16

本論文では, 自動車の進行方向の速度変動に起因する乗り心地に関して検討する. 自動車走行中に伴う速度変動に対して, 乗り心地評定実験を行い, 乗り心地評定値と速度変動を表す諸物理量との関連を検討した. 進行方向の加速度およびジャークを説明変量とし, 被験者の乗り心地評定値を目的変量として, これらを関係付ける線形重回帰モデルを構築し, 客観的な乗り心地指数を定式化することを試みた. その結果, 実験より得られた被験者の乗り心地評定値と構築したモデルより推定した乗り心地指数との間に高い相関があり, 提案した線形重回帰モデルを用いた乗り心地評価の手法が有効であることが確認された. こうした研究を進めることにより, 乗り心地を規定する物理的情報をある種の乗り心地指数として運転者にフィードバックすることで運転手の運転手法を改善し, 乗客に優しい運転が実現できることが期待される.
著者
佐川 貢一 煤孫 光俊 大瀧 保明 猪岡 光
出版者
公益社団法人 計測自動制御学会
雑誌
計測自動制御学会論文集 (ISSN:04534654)
巻号頁・発行日
vol.40, no.6, pp.635-641, 2004-06-30 (Released:2009-03-27)
参考文献数
8
被引用文献数
2 3

Non-restricted estimate of three-dimensional (3D) walk trajectory during indoor locomotion is discussed. The walk trajectory is derived by the integration of the 3D acceleration of subject's foot. A sensor system is composed of an 3D accelerometer, three gyroscops, and one geomagnetic sensor and is attached on the tiptoe. Integral errors of the acceleration and the angular velocity are modified to keep the continuity of the velocity and the posture of the sensor system between the swing phase and the stance phase. Six subjects performed walk experiments including level walk, ascending, and descending in an office building to verify the proposed method. The experimental results show that the estimation error of 3D location to the actual walk distance is less than 10 [%] and the application of the proposed method improves the precise measurement of 3D walk trajectory.
著者
王 鋒 佐川 貢一 猪岡 光
出版者
日本人間工学会
雑誌
人間工学 (ISSN:05494974)
巻号頁・発行日
vol.36, no.4, pp.191-200, 2000-08-15
被引用文献数
9
著者
王 鋒 佐川 貢一 石原 正 猪岡 光
出版者
The Institute of Electrical Engineers of Japan
雑誌
電気学会論文誌. D, 産業応用部門誌 = The transactions of the Institute of Electrical Engineers of Japan. D, A publication of Industry Applications Society (ISSN:09136339)
巻号頁・発行日
vol.122, no.7, pp.730-735, 2002-07-01
被引用文献数
9 8 5

This paper describes the development of a driver assistance system for improving passenger ride comfort of automobiles. Based on results of psychophysical experiments of subjective ride comfort evaluation, a linear multiple regression model that evaluates the ride discomfort index (RDI) is proposed using longitudinal acceleration and jerk of the automobile as explanatory variables. In order to reduce the ride discomfort caused by the velocity fluctuation of an automobile, a microcomputer-based driver assistance system that evaluates the RDI and informs the driver of the RDI in real time by both visual and auditory means is developed. Experiments show that, with the help of the system, a driver can improve his/her driving skills and modify his/her driving behavior to provide passenger-friendly maneuvers and improve passenger ride comfort, thus verify the usefulness of the proposed driver assistance system.
著者
大瀧 保明 鈴木 明宏 張 秀敏 佐川 貢一 永富 良一 猪岡 光
出版者
一般社団法人日本機械学会
雑誌
IIP情報・知能・精密機器部門講演会講演論文集
巻号頁・発行日
vol.2005, pp.341-344, 2005-03-21

Main objective of this study is to evaluate physical activity by means of a portable device utilizing accelerometers and a barometer. A simple and effective algorithm was proposed to classify physical activities including vertical movements such as stair climbing, and estimates its exercise intensities. The propose method performed successful classifications and feasible estimation of the energy consumption in the experimental study comparing with the measured values of the expiratory gas monitoring system. The result suggested that the correct evaluation of vertical movements made an improvement in the estimation of energy consumptions, which provides better assessment in physical therapies.
著者
佐川 貢一 阿保 萩子
出版者
一般社団法人日本機械学会
雑誌
年次大会講演論文集 : JSME annual meeting
巻号頁・発行日
vol.2006, no.5, pp.583-584, 2006-09-15

Measurement method of three-dimensional trajectory of forearm during baseball pitch using body-mounted sensor is discussed. From the optical motion capture system, it is estimated that the acceleration and the angular velocity of the arm reach up to 100 [G] and 8000 [deg/s], respectively, when the professional level baseball pitchers play the best throw. Three-dimensional, low gain accelerometers and gyroscopes in addition to high gain sensors are employed to avoid the saturation of the measured signals from the sensors. The trajectory and direction of the forearm are calculated based on the numerical integration of the acceleration and angular velocity. Integral errors are rejected by the definition of initial and final velocity, position and direction of the forearm. The experimental results showed that the estimated position and angle of the forearm highly corresponded with the video image. The proposed method enables easy, inexpensive and independent measurement from location.