Tokyo, Japan
Tokyo, Japan

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Deng Y.-S.,Beijing Jiaotong University | Xia H.,Beijing Jiaotong University | Zenda Y.,TESS Co. | Inoue H.,TESS Co. | Qi L.,TESS Co.
Gongcheng Lixue/Engineering Mechanics | Year: 2011

Ladder track is a new type of vibration-reduction track system that has been applied to several urban railways in China. A series of experiments were carried out on the ladder track installed on the trial section of an elevated bridge on the Beijing Metro Line 5. The vibration transmission behaviours of the track were tested in the lab. The track irregularities were measured and the dynamic responses were measured of rails, sleepers and bridge deck when the train running on the ladder track and the common non-ballasted slab track. The data were analyzed in the time domain and the frequency domain. The experimental results show that: compared with common non-ballasted track, the ladder track has good vibration reduction characteristics.

Sogabe M.,Structure Mechanics Laboratory | Asanuma K.,TESS Co. | Nakamura T.,Track Structures and Geotechnology Laboratory | Kataoka H.,Track Structures and Geotechnology Laboratory | And 2 more authors.
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2013

Research has been carried out on the safety of ballasted track with a view to minimizing damage during earthquakes. There remains however a lack of insight into the dynamic behavior of ballasted track itself during earthquakes. Consequently the authors of this paper first carried out static analyses to evaluate stability of straight track resistance to buckling when using continuous welded rails. Secondly the authors carried out dynamic analyses of ballasted track behavior laid directly on the ground or on a structure, under earthquake conditions, based on parameters such as lateral peak resistance of ballast and scale of earthquake, inter alia.

Handa and Tess Co. | Date: 2014-02-26

A three-wheel pedal-style wheelchair which includes a roller at a side, close to the ground, of the wheelchair, wherein the roller prevents the wheelchair from turning over, a steering wheel arranged at a side of the wheelchair, and two front wheels respectively arranged at two opposite sides of the wheelchair, wherein the two front wheels comprises a driving wheel led to rotate forward or backward by a user stepping and a loose wheel, wherein when the wheelchair turns to a direction in a small radius, the steering wheel is considerably rotated to a direction and the driving wheel is rotated forward, wherein when the wheelchair turns to another direction, the steering wheel is considerably rotated to a direction and the driving wheel is rotated backward. Accordingly, the wheelchair is easily controlled to have a small turn, like whirling in one spot, to move and to turn safely.

Xia H.,Beijing Jiaotong University | Xia H.,Catholic University of Leuven | Deng Y.,Beijing Jiaotong University | Deng Y.,Catholic University of Leuven | And 6 more authors.
Structural Engineering and Mechanics | Year: 2013

As a new type of vibration reduction, the ladder track system has been successfully used in engineering. In this paper, a numerical model of the train-track-viaduct system is established to study the dynamic responses of an elevated bridge with ladder track. The system is composed of a vehicle submodel, a track submodel and a bridge submodel, with the measured track irregularities as the system self-excitation. The whole time histories of a train running through an elevated bridge with 3×27m continuous PC box girders are simulated. The dynamic responses of the bridge such as deflections, lateral and vertical accelerations, and the vehicle responses such as derailment factors, offload factors and car-body accelerations are calculated. The calculated results are partly validated through the comparison with the experimental data. Compared to the common slab track, adapting the ladder sleeper can effectively reduce the accelerations of the bridge girder, and also reduce the car-body accelerations and offload factors of the train vehicle. © 2013 Techno-Press, Ltd.

Clinical studies on application of functional electrical stimulation (FES) to motor rehabilitation have been increasing. However, muscle fatigue appears early in the course of repetitive movement production training by FES. Although M-wave variables were suggested to be reliable indices of muscle fatigue in long lasting constant electrical stimulation under the isometric condition, the ability of M-wave needs more studies under intermittent stimulation condition, because the intervals between electrical stimulations help recovery of muscle activation level. In this paper, M-waves elicited by double pulses were examined in muscle fatigue evaluation during repetitive movements considering rehabilitation training with surface electrical stimulation. M-waves were measured under the two conditions of repetitive stimulation: knee extension force production under the isometric condition and the dynamic movement condition by knee joint angle control. Amplitude of M-wave elicited by the 2nd pulse of a double pulse decreased during muscle fatigue in both measurement conditions, while the change in M-waves elicited by single pulses in a stimulation burst was not relevant to muscle fatigue in repeated activation with stimulation interval of 1 s. Fatigue index obtained from M-waves elicited by 2nd pulses was suggested to provide good estimation of muscle fatigue during repetitive movements with FES.

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