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Numerical analysis for coupled train considering 3D wheel/rail contact geometry
Natsumi Nakano,Yoshiaki Terumichi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
The purpose of this study is to propose a coupled train model with a multibody system considering three-dimensional wheel/rail contactgeometry and to assess the safety of high-speed railway vehicles. Railway vehicles are becoming lighter and are running at increasedspeeds, so it is necessary to discuss their safety when subjected to a crosswind. In this paper, we use the proposed model in a situationpresupposing strong crosswinds in order to analyze the behavior of coupled trains under this condition. We discuss the modeling andformulation of a coupled train as well as wheel unloading ratios. Our results show that vibration of a car body is largest in the wheelunloading ratios of the car body when the frequency of the car body is close to the second-mode natural frequency of the vehicle system.
The Development of the Totalized Hydrogen Energy Utilization System for Commercial Buildings
Maeda, Tetsuhiko,Nakano, Akihiro,Ito, Hiroshi,Tange, Manabu,Kawakami, Yoshiaki,Kato, Atsushi,Masuda, Masao The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.2
We have proposed the Totalized Hydrogen Energy Utilization System(THEUS) for applying to commercial buildings. THEUS consists of fuel cells, water electrolyzers, metal hydride tanks and their auxiliaries. We evaluated the energy saving of the basic THEUS in view of an actual operation using thermal demand data of actual buildings. The THEUS have ability for achieving energy saving, in comparison with an ice storage system for cooling demand. We have developed the hydrogen storage system using metal hydride and unitized reversible cell (URC) combine the functionality of a fuel cell and an electrolyzer in a single device, these are important components of THEUS. The metal hydride tank designed and manufactured to evaluate that we assumed actual operation in the experiments. We developed the numerical simulation code, and simulation results are in good agreement with experimental data. The simulation about two tanks system was done by using this code. The heat utilization can be improved greatly. To achieve URC commercial use, improvement of durability was examined. It confirmed that our URC had durability for several thousand hours.
Satoh, Kayo,Yoshikawa, Nobuhiro,Nakano, Yoshiaki,Yang, Won-Jik Techno-Press 2001 Structural Engineering and Mechanics, An Int'l Jou Vol.12 No.5
A new sort of learning algorithm named whole learning algorithm is proposed to simulate the nonlinear and dynamic behavior of RC members for the estimation of structural integrity. A mathematical technique to solve the multi-objective optimization problem is applied for the learning of the feedforward neural network, which is formulated so as to minimize the Euclidean norm of the error vector defined as the difference between the outputs and the target values for all the learning data sets. The change of the outputs is approximated in the first-order with respect to the amount of weight modification of the network. The governing equation for weight modification to make the error vector null is constituted with the consideration of the approximated outputs for all the learning data sets. The solution is neatly determined by means of the Moore-Penrose generalized inverse after summarization of the governing equation into the linear simultaneous equations with a rectangular matrix of coefficients. The learning efficiency of the proposed algorithm from the viewpoint of computational cost is verified in three types of problems to learn the truth table for exclusive or, the stress-strain relationship described by the Ramberg-Osgood model and the nonlinear and dynamic behavior of RC members observed under an earthquake.
손영선 ( Son Young Seon ),최호 ( Choi Ho ),이강석 ( Lee Kang Seok ),나카노요시아키 ( Nakano Yoshiaki ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
The main purpose of this study is to provide a basic information regarding the earthquake preparedness of existing reinforced concrete buildings in Korea by reviewing applicabilities of the Japanese Standard for Evaluation of Seismic Capacity of Existing Reinforced Concrete Buildings. In this study, the seismic capacity of the Research Laboratory building in Institute of Industrial Science, University of Tokyo in Japan, which was constructed in 1961 and extended in 1962, was investigated based on the Japanese Standard. The result indicates that the seismic capacity and retrofit judgement of existing reinforced concrete buildings in Korea can be reasonably applied using the Japanese Standard.
선택영역성장 기술을 이용한 전광 논리소자용 광소자의 제작 및 측정
손창완,윤태훈,이석,Son, Chang-Wan,Yoon, Tae-Hoon,Lee, Seok,Nakano, Yoshiaki 한국광학회 2007 한국광학회지 Vol.18 No.1
Using the Selective Area Growth (SAG) technology of Metal Organic Chemical Vapor Deposition (MOCVD), we successfully integrated an active device and passive devices on the same substrate. In other words, we integrated a Semiconductor Optical Amplifier (SOA) as an active device and an S-bend waveguide and a Multi Mode Interference (MMI) waveguide as passive devices. The SOA is successfully integrated with passive devices on the same substrate. The Cross-Gain Modulation (XGM) characteristic of the integrated SOA and the loss of an MMI and an S-bend waveguide were measured. Measured XGM characteristics of the SOA showed an extinction ratio of 8.82 dB. The total loss of the MMI and S-bend waveguide was 18 dB. 본 연구에서는 광통신 시스템에 있어서 필수적인 기능으로 전망되고 있는 전광 논리소자를 구현하기 위한 집적된 광소자를 제작, 측정 하였다. 유기금속화학증착법(MOCVD)을 이용한 선택영역 성장기술을 이용하여 서로 다른 두 활성영역을 한 기판위에 성장함으로써 능동 반도체 광소자인 반도체 광증폭기와 수동 반도체 광소자인 다중모드 간섭 도파로, S-자 도파로를 집적하였다. 집적된 수동 소자부분의 손실을 측정하고 전광 논리소자를 구현하는 방법 중 하나인 반도체 광증폭기의 cross-gain modulation(XGM)특성을 측정하여 집적된 전광 논리소자로의 사용 가능성을 알아보았다.
Young-Il Kim,Chang Wan Son,우덕하,Min Chul Park,이석,김선호,Tae-Hoon Yoon,Yoshiaki Nakano 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2
The proposed tunable laser exhibits a high degree of frequency selectivity and electrically controlled wide wavelength tunability. Also, we have dynamic analysis of the tunable laser based on laterally coupled semiconductor optical amplier and laser diode. This structure is simulated by using the coupled mode theory and the modied time-domain transfer matrix method. The simulation result yields a tuning range of 48 nm with a side mode suppression ratio around 35 dB.