Abe M.,West Corporation |
Shimamura M.,East Japan Railway Company
Journal of Performance of Constructed Facilities | Year: 2014
Damage and performance of railway bridge structures during the 2011 Tōhoku Earthquake are reported. Although the scale of the earthquake was historically the largest known, seismic damage to structures was smaller and less time was required for recovery of service compared with an earlier major earthquake. Upgrading of seismic code and planned seismic retrofits performed after the 1995 Kobe Earthquake were found effective for reducing seismic damage to bridges and civil structures; damage to bridge superstructure, with complex geometry and damage to secondary structural systems such as electric-power poles, now became the prominent type. Enormous structural damage observed for areas affected by severe tsunami forces (which had offered great challenge to structural engineering) is also reported. Following this, bridge performance (under the force of the 2011 Tōhoku earthquake and subsequent tsunami) is studied using data recorded by monitoring systems installed on bridges that were located in strong motion areas. Based on this experience, advantages of and challenges to the structural health monitoring system are also discussed. © 2014 American Society of Civil Engineers. Source
Ogata M.,East Japan Railway Company
IEICE Transactions on Communications | Year: 2016
East Japan Railway Company has created new businesses such as life-style business and information technology business on the basis of railway business for sustainable growth. These businesses generate and provide synergy to one another effectively because each business is autonomous decentralized system based on diversified infrastructure. The infrastructure includes not just structure but management, technology, operation and maintenance: we call this "MTOMI Model." The MTOMI Model is the key concept of JR East's businesses and can generate JR East's ecosystem. Copyright © 2016 The Institute of Electronics, Information and Communication Engineers. Source
East Japan Railway Company and Kawasaki Jukogyo Kabushiki Kaisha | Date: 2011-06-29
A range image obtaining system for a track includes a laser slit light source disposed within a plane perpendicular to a tread of a rail and emits laser slit light within the plane; a two-dimensional image imaging device which is disposed to have an angle with respect to the plane perpendicular to the tread of the rail and obtains a light sectioning image generated from the laser slit light; and an image signal processing device for generating a range image based on a distance from the two-dimensional image imaging device based on the light sectioning image.
East Japan Railway Company and Hokkaido University | Date: 2011-09-15
An environmental information measurement device includes: a power source unit; an environmental information detector; a timer; and a controller. The power source unit generates, from an electromagnetic wave received, a power source voltage to be supplied to a load. The load includes the environmental information detector, the timer, and the controller. The environmental information detector includes a detector including a circuit element having an impedance or an electrostatic capacitance that varies according to a physical amount detected under an environment at a measurement target point, and outputs a signal that varies according to a response characteristic of the detector. The timer measures a duration from the time when measurement is initiated to the time when a voltage of the signal becomes a predetermined detection voltage. The controller controls an operation of the environmental information detector.
TOYO Electrical Manufacturing LTD. and East Japan Railway Company | Date: 2011-09-30
A slider is slightly moved in a direction in which both side surfaces of the slider come in contact with inclined surfaces of impact mitigating parts of neighboring contact strip pieces. For this reason, the inclined surface of the impact mitigating part of the contact strip piece which the slider approaches is relatively downwardly slid with respect to one side surface of the slider. In addition, the inclined surface of the impact mitigating part of the contact strip piece from which the slider moves away is relatively upwardly slid with respect to the other side surface of the slider. As a result, since an impact generated between the contact strip piece and the slider is mitigated by the impact mitigating part without fitting the slider into a stepped section between the neighboring contact strip pieces, the slider is smoothly transferred from the one contact strip piece of the neighboring contact strip pieces to the other contact strip piece.