Reduction of preview distance in lane-keeping control

Lane marker detection is indispensable for a lane-keeping-control algorithm. However, it is impossible to detect lane markers when the curvature of the lane the vehicle is travelling on is large or when there is another car in front of the vehicle with short distance. For lane marker detection, it is desirable to set a preview point close to the vehicle. Therefore, by analyzing the block diagram of driver-vehicle system, we propose a method to reduce preview distance without lane tracking performance deterioration by increasing preview points from the conventional one point to two points. Furthermore, it is revealed that driving along a corner with constant curvature without steady-state deviation and arbitrary design of tracking dynamic characteristics become possible by increasing preview points.     

Evaluation of physical load of hand-rim wheelchair propulsion on barrier-free model courses

The aim of this study was to examine the effect of sidewalk developments on the physical load of hand-rim wheelchair propulsion using a barrier-free model course. Non-wheelchair users performed wheelchair exercise tests and R-R interval time, discomfort rating, and postural changes of seating were measured. As a result, due to excessively heavy load on certain parts of the body during active propulsion on the sidewalk, it was shown that barrier-free developments did not lead to a reduction of physical load. The results suggest the importance of a well-balanced barrier-free sidewalk design that takes into account the individual character of the wheelchair user's seating posture and physical load at the time of maneuvering. In addition, it is shown that the reduction of physical load can be considered as an effective method of evaluation.     

山梨磁悬浮试验线车辆MLX01的动力学性能

在山梨磁悬浮试验线上进行的车辆运行试验始于１９９７年４月。在当年１２月，载人和非载人车辆的运行速度已分别达到５３０ｋｍ／ｈ和５５０ｋｍ／ｈ。本文选取与车辆结构有关的细节及车辆运行试验的结果作了介绍，同时分析了车辆动力学性能，包括悬浮车辆在高速和低速运行时相关的悬浮性能、横向定位性能及稳定性能。     

东京首都圈城市轨道交通系统的作用

介绍了地铁、小截面地铁、独轨列车、ＡＧＴ、ＬＲＴ等城市轨道交通系统的特点，并分析了日本东京首都圈的轨道交通运输实绩及其作用。对轨道交通建设基金的筹措等也作了简要分析。     

Drift force on a bottom-mounted slightly porous vertical cylinder fixed in regular waves

 Explicit expressions are derived for the drift force that will act on a bottom-mounted, slightly porous vertical cylinder fixed in regular waves. The drift-force expressions derived both from the near-field and the far-field are shown. It is indicated, and numerically demonstrated, that the conventional far-field formula does not hold for a porous body, but needs the additional term of a near-field body-surface integration. Received: July 4, 2002 / Accepted: November 6, 2002 Acknowledgment. The author would like to acknowledge Prof. Kashiwagi, of Kyushu University, for indicating the work of Havelock relating to Eq. 20. Address correspondence to: H. Kagemoto (e-mail: kagemoto@k.u-tokyo.ac.jp)     

止裂韧度值Kca的实尺模型试验研究

对船用钢进行长裂纹止裂特性研究表明:它们的脆性裂纹止裂能力不够。TMCP钢有足够的脆性裂纹止裂能力。对船用钢进行了两种实尺(actual-scale)模型试验,明确了脆性裂纹扩展的条件。根据试验结果提出了止裂韧度值Kca,已经归纳在"脆性裂纹止裂设计指导性文件"中。     

东日本铁路公司开发的市郊列车

介绍了东日本铁路公司4个系列市郊列车的发展过程,并从车体、转向架、主电路、控制装置、制动装置等几方面进行了阐述.