Mathubara T.,JR East Consultants Company |
Hiroe M.,Kobayasi Institute of Physical Research |
Nagakura K.,Railway Technical Research Institute
39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010 | Year: 2010
In this paper, we propose the new method, which is based on the prediction model of Railway Technical Research Institute, to predict sound exposure levels (LAE) of conventional railway at the high-rise buildings. In order to grasp vertical distribution of LAE at the high-rise buildings, field examinations were carried out at areas, in the range of 1.2 m to 25 m high from the ground and 4 m to 30 m distant from the near-side track, along two different railway lines with no barriers. From the vertical distributions of the measured LAE, we introduced the correction corresponding to the vertical directivity, which is expressed by a quadratic function of the elevation angle, to the RTRI prediction model. From verifications of the precision of noise levels predicted by the new method at these two lines, it became clear that noise levels in the high-rise buildings could be predicted within an error of about 2 dB.
Hiroe M.,Kobayasi Institute of Physical Research |
Ishikawa S.,JR East Consultants Company
40th International Congress and Exposition on Noise Control Engineering 2011, INTER-NOISE 2011 | Year: 2011
We applied a numerical technique to transform a two-dimensional (2D) solution to a three-dimensional (3D) solution based on Duhamel's transformation method using the transient solution obtained by Finite Difference Time Domain (FDTD) simulation to calculate the propagation of bogie noise, which is the predominant noise from the lower part of a train. Reflective barriers that have different edge shapes were used in this investigation, and the source model of bogie noise was treated as an array of incoherent line sources. To verify the 3D transformation results obtained with Duhamel's method, we carried out an experiment using a 1/25 3D scale model of a reflective inverted-L barrier. The good agreement between the numerical and experimental results indicates that the 3D transformation technique is a useful tool for precisely predicting the sounds that propagate from incoherent line sources such as bogie noise sources. Moreover, we also calculated the shielding effects of several noise barrier shapes against bogie noise using the 2D-FDTD method, and clarified the differences between the improved shielding effects of the barriers against bogie noise in both 2D and 3D transformed using Duhamel's method.
Kiryu S.,JR East Consultants Company |
Murono Y.,Railway Technical Research Institute |
Morikawa H.,Tokyo Institute of Technology
Earthquake Engineering and Structural Dynamics | Year: 2012
An effective method for the seismic retrofitting of the sidewalls of cut-and-cover tunnels has not yet been established. Thus, a new method of seismic retrofitting for cut-and-cover tunnels, called the 'polymer isolation method', is developed here. In this method, thin walls made of polymer materials, called 'isolation walls', are inserted between the ground and the sidewalls of a tunnel. We demonstrate the effectiveness of the proposed method in reducing the seismic response of tunnels by using some numerical simulations. It is found that the proposed method depends on the thickness of the soil cover over the tunnel and the ratio of the stiffness between the soil and the structure. Furthermore, a simple chart is proposed for convenience to represent the applicability of the polymer isolation method to the design of seismic retrofits for cut-and-cover tunnels. Although this particular chart has been obtained through a limited case, some other typical cases in which the chart can also be implemented for special conditions are addressed, and the applicability and the limitations of this chart are suggested for possible conditions of the ground and of tunnel structures. © 2012 John Wiley & Sons, Ltd.
Kimura K.,Takasago Thermal Engineering Co. |
Shibata K.,Takasago Thermal Engineering Co. |
Tanita N.,East Japan Railway Co. |
Sato M.,JR East Consultants Company |
Kondo Y.,Tokyo City University
Journal of Environmental Engineering (Japan) | Year: 2015
The actual cooling load of underground stations in recent years has been much lower than the designed load thirty years ago. Therefore, it is important to estimate the actual load in the planning of cooling systems. In this study the cooling load caused by train wind in an underground station was discussed and a field measurement and computational fluid dynamics (CFD) simulation were conducted. The main conclusions are as follows: (1) The measurement showed that air volume of the train wind was greatly affected by the train speed and the tunnel structure (single or double track). (2) In the CFD simulation, the train was modeled as a moving body to simulate train wind. The CFD simulation with a pressure loss model in the tunnel could reproduce the measurement. (3) The influence of train wind on the platform cooling system was examined by the CFD simulation in terms of an influence coefficient. In the Shin-Nihombashi station, the influence coefficient was approximately 0.38 in the area connecting to the tunnel while the coefficient was about 0.24 in the center area.
Matumoto Y.,JR East Consultants Company |
Kobayashi M.,JR East Consultants Company |
Yoshida K.,JR East Consultants Company |
Fukami J.,JR East Consultants Company |
Kato T.,University of Tokyo
Japanese Railway Engineering | Year: 2011
Public service companies are required to act promptly when a disaster occurs, they collect and analyze necessary information separately; a lot of valuable information is stored separately and is not shared efficiently. We have devised GDMS, in which each organizations can share information. We focused on two platforms; one is an organizational platform to operate this service on a commercial basis and the other is a systematic platform to store information.
Jeon I.,University of Tokyo |
Sakai R.,Fujipre Sales Corporation |
Nakagawa T.,University of Tokyo |
Setoguchi H.,JR East Consultants Company |
And 2 more authors.
Organic Electronics: physics, materials, applications | Year: 2016
Small-molecule DPP(TBFu)2-based inverted organic solar cells were fabricated and their stability investigated. The effects of thermal annealing and solvent annealing on device performance and stability were compared. To increase the stability, mix-PCBM (PC61BM and its C70 analogue), which is reported to give higher device stability, was also included. Solvent-annealed devices showed the highest power conversion efficiency (PCE) of 4.62%, whereas thermally annealed devices showed a PCE of 3.94%. After the aging process, which involved thermal stress and exposure to air, thermally annealed and mix-PCBM devices retained a PCE of 3%, whereas solvent-annealed devices had a much lower PCE of 1.7%. Therefore, our results show that in the long-term stability perspective, thermal annealing is better than solvent annealing, and mix-PCBM is better than PC61BM in the case of DPP(TBFu)2. We fabricated small-molecule inverted organic solar cells that retain their performance in air for 3 weeks without encapsulation. © 2016 Elsevier B.V.All rights reserved.
Matsumaru T.,Foundation and Geotechnical Engineering Laboratory |
Kojima K.,Foundation and Geotechnical Engineering Laboratory |
Tanaka Y.,JR East Consultants Company |
Kuriyama R.,Fukken Engineering Co. |
And 2 more authors.
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2014
Monitoring of the deformation of earth retaining walls for excavating work is vital in order to protect the surrounding environment and to ensure the safety of structures during construction. Since it is difficult to evaluate the overall behavior with only partial measurement, it is expedient to introduce multipoint measurement. However, this method tends to be expensive. This paper introduces a system developed for evaluating and visualizing retaining walls as a three-dimensional curved surface. In order to confirm the effectiveness of the proposed system in actual monitoring, the system was applied to the on-site measurement. This paper also proposes a method of monitoring retaining walls by combining this system and simple inclinometers.
Murakami H.,Advanced Railway System Development Center |
Henda F.,JR East Consultants Company |
Tsunoda F.,Railway Operations Headquarters
Japanese Railway Engineering | Year: 2014
To improve transportation quality and service quality further leveraging ICT, we have done technological development of various functions to enhance responses in case of transport disorder using tablet PCs provided to train crews. Development was done by installing three functions on the tablet PC: "Timetable Transmission", "Computerization of rule books, manuals, etc. and "Capture of geographic positional location of tablet PCs". At the trial crew depot, all crew members carried tablet PCs to conduct the field test. There were no major issues during the trial and the trial was conducted smoothly. At the time of transport disorder, train timetables were transmitted to the tablet PCs and the time to make the necessary arrangement to resume train operation was shortened.
Toyooka A.,Administration Division |
Murono Y.,Earthquake and Structural Engineering Laboratory |
Nogami Y.,JR East Consultants Company |
Nishimura T.,Earthquake and Structural Engineering Laboratory
Quarterly Report of RTRI (Railway Technical Research Institute) | Year: 2012
The research in this paper studies the effect of the response of upper structure and soil deformation on the overall behavior of structure through static and dynamic analyses. Several structures with pile foundations, such as bridge pier, viaduct and isolated bridge, were assumed to be constructed on a soil of good condition. The soil deposit characters were selected so that their deformations could be regarded as negligible in the design standard, whereas their shear velocity and resulting strain would change drastically with the depth. It was clarified through series of simulations that response of soils significantly affects the moment distributions of piles, regardless of the amount of response of superstructures. It consequently follows that the soil behavior should be properly considered even under good soil condition.
East Japan Railway Company, JR East Consultants Company and Kyocera Corporation | Date: 2011-08-31
To provide a power generation member having a high power generating capacity, a power generation device using the same, and a power generation system. A power generation member 1 includes: a piezoelectric element 2 in which electrodes 2a and 2c are formed on both main faces of a plate-shaped piezoelectric ceramic 2b; a pressing member to press one main face of the piezoelectric element 2; and a support member 4 to support the other main face of the piezoelectric element 2, wherein the support member 4 supports an outer rim of the piezoelectric element 2, and the pressing member 3 presses the piezoelectric element 2 at a part inside the support member 4 with a planar pressing face. It is possible to reduce cancellation of the generated charge, as well as to allow the piezoelectric ceramic 2b to deform sufficiently to produce large strain by pressure energy generated by a walking man or vibration energy generated by a running car and the like. As a result, it is possible to effectively obtain large electricity.