http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Analysis of Time-Dependent Deformation of CFRP Considering the Anisotropy of Moisture Diffusion
Arao, Yoshihiko,Koyanagi, Jun,Hatta, Hiroshi,Kawada, Hiroyuki The Korean Society for Composite Materials 2008 Advanced composite materials Vol.17 No.4
The moisture absorption behavior of carbon fiber-reinforced plastic (CFRP) and its effect on dimensional stability were examined. Moisture diffusivity in CFRP was determined by measuring a specimen's weight during the moisture absorption test. Three types of CFRP specimens were prepared: a unidirectionally reinforced laminate, a quasi-isotropic laminate and woven fabric. Each CFRP was processed into two geometries - a thin plate for determination of diffusivity and a rod with a square cross-section for the discussion of two-dimensional diffusion behavior. By solving Fick's law expanded to 3 dimensions, the diffusivities in the three orthogonal directions were obtained and analyzed in terms of the anisotropy of CFRP moisture diffusion. Coefficients of moisture expansion (CMEs) were also obtained from specimen deformation caused by moisture absorption. During moisture absorption, the specimen surfaces showed larger deformation near the edges due to the distribution of moisture contents. This deformation was reasonably predicted by the finite element analysis using experimentally determined diffusivities and CMEs. For unidirectional CFRP, the effect of the fiber alignment on CME was analyzed by micromechanical finite element analysis (FEA) and discussed.
Development of Rehabilitation Robot System with Functional Fluid Devices for Upper Limbs
Junji Furusho,Ken’ichi Koyanagi,Ushio Ryu,Akio Inoue,Kunihiko Oda 한국과학기술원 인간친화 복지 로봇 시스템 연구센터 2003 International Journal of Assistive Robotics and Me Vol.4 No.2
New training methods and exercises on upper limb rehabilitation are made possible by application of robotics and virtual reality technology. The technology also makes quantitative evaluations to enhance the qualitative effect of training. However, rehabilitation systems applying training within a three-dimensional to upper limbs have not been in practical use. The authors had earlier developed 2-DOF (degrees of freedom) rehabilitation robot systems. Lately, they have involved in a project managed by NEDO, “Rehabilitation System for the Upper Limbs and Lower Limbs,” and developed a 3-DOF exercise machine for upper limb (EMUL). In this paper, the authors report on the 2-DOF systems and their application for rehabilitation. They also present the development of EMUL with an example of software for motion exercise training. Particularly discussed is the functional fluid device that ensures the mechanical safety.
Modeling of an ER Fluid’s Time Delay for Servo Systems
Tomohiro Terada,Ken’ichi Koyanagi,Toru Oshima 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A particle type ER(Electro-Rheological) fluid damper in which viscosity was controlled for fast and precise positioning control have been developed in aprevious study. However, for improvement of control performance or new control demands of mechatronics devices using particle type ER fluids, it will be needed to further investigate are sponse time of the fluids. It is commonly said around 5-milliseconds, but, the formula structure of that delay has not been clear. This study aims to develop a functional damper(attenuators), that can control its viscous characteristics in real time using ER fluids as its working fluid. ER dampers in this case are useful to a ccomplish high precision positioning not to prevent high speed movement of the motor. To realize the functional damper that can be manipulated according to situation sortasks, the modeling and control of ER fluids are necessary. This paper investigates time delay affects of ER fluids and makes an in-depth dynamic model of the fluid by utilizing simulation and experiment. The mathematical model has a dead-time and first ordered delays of the fluid and the high voltage amplifier for the fluid.
Elasticity of the quadriceps femoris muscle during stretching at different pelvic tilt positions
( Yoshinori Kimura ),( Maki Koyanagi ),( Daichi Yamada ),( Shuhei Tada ),( Yumiko Satoda ),( Sayaka Kondo ),( Ryosuke Fukumura ),( Natsumi Seto ),( Yasuhiro Mitani ),( Naruhiko Nakae ),( Takuji Sugimo 대한운동사협회 2017 대한운동사협회 운동사대회자료집 Vol.2017 No.-
Nozawa, Tatsuhiro,Miyaguchi, Yuki,Hida, Yusuke,Koyanagi, Kaoru,Yokoyama, Ryuichi,Shirai, Goro 대한전기학회 2012 The Journal of International Council on Electrical Vol.2 No.1
This paper presents the effectiveness evaluation approach of demand side management (dema nd control) for frequency regulation in regional power networks (so called Cluster-oriented networks). The analytical model of the frequency fluctuation for a three-cluster interconnected network model was developed with MATLAB/SIMULINK. The control method is similar to the conventional TBC (Tie Line Bias Control) widely used in power grids. In order to maintain the quality of frequency, Battery Energy Storage Systems (BESS) and controllable loads such as heat pumps installed in the customer side will play an effective role in clusters. By the results of conducted simulations, it shows that the proposed new frequency regulation scheme by utilizing controllable loads such as battery charges and heat pumps retains effectiveness to suppress frequency deviation when a large amount of natural renewable energy is installed in the regional cluster-oriented networks.