Yamaguchi M.,Nippon Bunri University |
Murakami K.,Kumamoto University |
Takeda K.,Kumamoto University |
Mitsui Y.,Kumamoto University
Journal of Advanced Concrete Technology | Year: 2011
When designing blast-resistant reinforced concrete (RC) structures, reducing spall damage due to reflected tensile stress waves is a major problem. To investigate the applicability of polyethylene fiber reinforced concrete (PEFRC) for use in blast-resistant RC structures, experimental investigations were conducted to evaluate the damage to PEFRC slabs subjected to contact detonation. As a result, it was shown that PEFRC was effective in reducing the spall damage due to contact detonation as compared with normal RC. Moreover, an equation for estimating damage depth to the PEFRC slab subjected to contact detonation was derived based on the test results. Copyright © 2011 Japan Concrete Institute.
Nagai H.,Nippon Bunri University |
Isogai K.,Nippon Bunri University
AIAA Journal | Year: 2011
The effects of wing kinematics on the aerodynamic characteristics of a flapping insect wing are investigated experimentally. The time-varying aerodynamic forces acting on the flapping wing are measured in hovering and forward flight using a dynamically scaled mechanical model in a water tunnel, which simulates a bumblebee flapping wing in hovering and forward flight. Wing kinematics can be categorized as trapezoidal or sinusoidal types. The trapezoidal flapping motion is divided into translational and reversal phases, and the trapezoidal feathering motion is divided into fixed-angle and rotational phases. In the sinusoidal type, the time histories of angles for the flapping and feathering motions are represented as sinusoidal functions. The feathering rotation during the flapping translation causes an increase in aerodynamic power rather than lift and thrust for hovering and forward flight. Therefore, it is preferable for the feathering rotation to be conducted during the flapping reversal phase for high efficiency. The trapezoidal flapping motion and trapezoidal feathering motion with a shorter duration of rotation should be selected for a higher efficiency in hovering and forward flight. This result indicates that many insects using the trapezoidal type attach importance to a good efficiency in selecting the wing kinematics. For a larger lift in hovering and slower forward flight, the sinusoidal flapping motion and trapezoidal feathering motion with a shorter duration of rotation should be selected. © 2011 by the American Institute of Aeronautics and Astronautics, Inc.
Uzaki K.-I.,Port and Airport Research Institute |
Ikehata Y.,Nippon Bunri University |
Matsunaga N.,Kyushu University
Journal of Coastal Research | Year: 2011
The wave absorption performance of a new type of steel floating breakwater with truss (FBT), which is composed of a box-type pontoon and truss structures, has been investigated experimentally. The truss structures are attached to the front and the rear of the pontoon, and exaggerate wave energy dissipation due to wave breaking. Flow visualization has revealed that the front truss breaks the incident waves and effectively converts wave energy to turbulent energy. Image analysis of the motions of the FBT and determination of the transmission coefficient K t showed efficient dissipation of wave energy resulting from the truss structure. K t is also discussed and quantified with the aid of dimensional analysis. Values of K t are plotted against the ratio of the water depth h to the wavelength of incident waves L, and the profiles obtained are normalized by introducing values of h/L at which K t equals 0.5, i.e., (h/L) 0.5. Normalization gives a universal empirical expression for K t, and empirical expressions of (h/L) 0.5 are also obtained by independently changing the shape parameters and the wave steepness. A graphic chart of (h/L) 0.5 is provided so K t of the FBT can be evaluated easily. This data-reduction method developed for the quantification of K t may be applicable for other floating breakwaters as well as for this new type. © 2011, the Coastal Education & Research Foundation (CERF).
Enokizono M.,Nippon Bunri University
2016 19th International Symposium on Electrical Apparatus and Technologies, SIELA 2016 | Year: 2016
This paper describes about the core loss (magnetic power loss, iron loss) reduction method for upgrading high efficiency motor. It is difficult to achieve the core loss reduction of motor by using conventional technique. Therefore we proposed the vector magnetic characteristic technology which is constructed magnetic characteristic analytical method, evaluation method of magnetic materials, and the building factor problem. Furthermore as an important magnetic characteristic, magnetostriction phenomena based on new viewpoint are introduced and its numerical simulation results. © 2016 IEEE.
Yamamoto T.,National Institute of Technology, Miyakonojo College |
Inoue M.,Nippon Bunri University
Journal of Structural and Construction Engineering | Year: 2016
A model testing for measuring a drop amount of the volcanic ash from a pitched roof was carried out. This testing indicates that a sliding of volcanic ash on a pitched roof can occur in a huge eruption and an occurrence of the sliding depends on surface roughness of roof material and a shape of surface of thereof An angle of a slope of the volcanic ash depositing on the pitched roof winch is an angle of the slope when the sliding is over can be main factor to understand of the sliding.
Isogai K.,Nippon Bunri University |
Kawabe H.,Nippon Bunri University
Transactions of the Japan Society for Aeronautical and Space Sciences | Year: 2010
The paper describes how to simulate the flight of a flapping-wing micro-aerial vehicle (MAV). It uses an aerodynamic database generated using three-dimensional Navier-Stokes code. The database is composed of the time mean aerodynamic forces and moments generated at various flapping wing motions in various flight modes. Flight is simulated utilizing the database by interpolation. The procedure is applied to transition flight of a dragonfly-type MAV with two-pairs of resonance-type flapping wings. The present MAV attains the mission of hovering, transition and cruising flights successfully with stable attitude. © 2010 The Japan Society for Aeronautical and Space Sciences.
Takemura Y.,Nippon Bunri University |
Ishii K.,Kyushu Institute of Technology
International Journal of Artificial Intelligence | Year: 2011
One of the most important aspects in mobile robots concerns vision based decision-making systems, where color constancy is a major problem for robots, since they often use the color property to recognize their environments. Animals can recognize the color and shape of objects despite large changes in lighting conditions in outdoor environments, for example. Biomimetic software and hardware have attracted much attention because of the possibility of realizing flexible and adaptive systems as in animals. We have been working on color constancy vision algorithms using a bio-inspired information processing technique. In this paper, we evaluate the performance of color recognition using bio-inspired information processing algorithms, namely the Self-Organizing Map (SOM), modular network SOM (mnSOM), and Neural Gas (NG), and discuss the experimental results under various lighting conditions. © 2011 by IJAI.
Sugisaka M.,Nippon Bunri University
IEEE International Conference on Digital Ecosystems and Technologies | Year: 2011
This document presents the exiting robots that are used in both American army in the operation of Iraq and Afghanistan and Japanese rescue teams formed after The Great Hanshin-Awaji Earthquake (1/17, 1955, 5:46:52 a.m. Magnitude 7.3). This document gives how some of existing robots could be used to survey the damaged Fukushima Dai-ichi nuclear power plant after East Japan Earthquake (3/11, 2011, 2:46:18 p.m. Magnitude 9.0, The largest domestic record) and Tsunami (10 m) © 2011 IEEE.
Yamamoto I.,Nagasaki University |
Inagawa N.,Nippon Bunri University |
Matsui M.,University of Kitakyushu |
Hachisuka K.,University of Occupational and Environmental Health Japan |
And 2 more authors.
Bio-Medical Materials and Engineering | Year: 2014
Compact rehabilitation robot system which can support movement of the wrist of patients has been developed. The robot system can detect and analyze the patient's intention to move the wrist by such a biological signal as muscle potential, then, assist the wrist exercise of patients. Also, both-wrist rehabilitation robot system by mirror effect has been successfully developed for practical use in the hospital and at home. © 2014 - IOS Press and the authors. All rights reserved.
Ikenoue M.,Ariake National College of Technology |
Wada K.,Nippon Bunri University
IEEJ Transactions on Electronics, Information and Systems | Year: 2015
In this paper, the methods of consistent estimation for identification of linear discrete-time system in the presence of input and output noises, which is usually called "errors-in-variables" (EIV) models, are studied. It is well known that the least squares (LS) method gives biased parameter estimates for EIV situations. To solve this bias problem, the instrumental variable (IV) methods and the least correlation (LC) method are often used. The IV and LC based methods can be applied in more general noise conditions, but these methods suffer from poor accuracy of the estimated parameters because the coefficient matrix of these methods may often become ill-conditioned. In order to obtain numerically stable estimates, the methods presented in this paper use the biased extended LC (XLC) estimates. The biased XLC estimates can be defined by using the extended vectors and the pre-filters. According to the bias compensation principle (BCP) technique, the proposed bias-compensated XLC (BCXLC) methods are developed. The way to reduce the computational load is examined. The results of simulated examples indicate that the proposed methods provide numerically stable and good estimates. © 2015 The Institute of Electrical Engineers of Japan.