vol.19 (2006)

Bulletin of Research Center for Computing and Multimedia Studies
Vol.19, 2006 ISSN 1880-7526 Published March 23, 2006

Numerical Analysis of Flow within Ultra Micro Centrifugal Compressor
Tomohito Akiyama, Kazuaki Hagiwara, Yuuichirou Asaga, Ryouichi Etou, Shimpei Mizuki, Hoshio Tsujita
PDF   Abstract
In recent years, a lot of experimental and numerical in vestigations have been made for the micro centrifugal compressor system used as the mobile electrical power source, the electric distributed energy source, the gas turbine for micro plane and so on. However, the downsizing of the centrifugal compressor system makes impossible to measure the internal flow in the rotating impeller experimentally. For realizing the micro centrifugal compressor, which constitutes a micro gas turbine, the internal flow in the micro centrifugal impeller was analyzed by CFD in detail.
Numerical Simulation in High Velocity Impact of Bumper Composition Material for Space Debris
- Effects of Impact Angle of Debris and Materials of Bumper -

Masatomo Nakagami, Masahide Katayama, Kazuyoshi Arai
PDF   Abstract
The space debris impact phenomenon of an artificial satellite on the Geostationary Earth Orbit was assumed, and impact numerical simulations and tests of aluminum alloy (A6061-T6) and Polycarbonate were carried out at various impact angles and velocities. The effects of the impact angle on failure mechanism of A6061-T6 and the difference of failure shape of A6061-T6 and Polycarbonate were discussed using the results of numerical simulation and impacts test.
A Study of Experimental Model Analysis by Means of Strain Response
Yuichi Tanabe, Hiroki Kuwabara, Mitsuo Iwahara, Akio Nagamatu
PDF   Abstract
To study the vibrational quality of the rotary structure which conventional experimental modal analysis has difficulty in measuring. For that, we carry out the experimental modal analysis by means of the strain gauge. And, find the vibrational quality from the experiment and calculation based on the acceieration pickup, then compare each of these.
Sound and Vibration Simulation of the Golf Club
Nobuhiro Matsumura, Hiramatsu Kaori, Nakazima Kazuhiro, Mitsuo Iwahara, Akio Nagamatsu
PDF   Abstract
The golf club is not able to have differentiation in a carry by a standard today. Therefore good sound quality became one of value-added of a golf club. A method to predict a sound at a design stage is effective to investigate sound good quality without taking an expense. With a hollow cylinder of the titanium which modelled a driver, We studied the technique this time.
Study on Performance Enhancement of Resonator Type Silencer
Hiroyuki Okano, Gaku Minorikawa, Mitsuo Iwahara, Akio Nagamatsu
PDF   Abstract
The silencer is roughly divided into passive, reactive and active types. The reactive silencer which has the Helmholtz resonator is widely used in industrial fields, since it performs large noise reduction of the discrete frequency in the low frequency range. In case that the silencer is constructed by sheet metal which the outer and inner plate of the silencer don’t have the sufficient sound insulation and the rigidity, the performance of the noise reduction is affected by unnecessary vibration of chatters due to the acoustic input. On the other hand, the vibration as the structural response may be used to reduce the noise effectively. In this report, the characteristics of the silencers were investigated by changing the plate thickness and the resonator arrangement such as the number of the holes and the length of the necks.
Noise Reduction of Stepping Motor by the Stiffness Improvement
Katsuya Kumeda, Iwahara Mitsuo, Nagamatsu Akio
PDF   Abstract
The purpose of the research is a noise reduction of stepping motor. The stepping motor the structure which rotates every step can simply realize position control, and it has velocity fluctuation by repeating acceleration and deceleration, and it becomes a factor in which the vibration is generated rotor. The structural optimization for the purpose of the rigidity improvement is carried out in search of the load point displacement sensitivity of the stator in order to reduce this vibration, and the vibration reduction is tried by the rigidity improvement.
A Research on Vibration and Performance of Bat for Baseball
Takahito Watanabe, Iwahara Mitsuo, Seishi Fujihara, Akio Nagamatsu, Kazuyoshi Arai, Masami Seki, Toshinori Morita
PDF   Abstract
It is a research on a metallic bat for baseball. There is the point which is called a sweet spot. At the point, a ball is repulsed most in the bat. The definition of a sweet spot is indefinite. The reason why a sweet spot is approved is researched. First of all, the first node, the 2nd node, and the center of impact were measured. Next, the ball was made to collide with them and the repulsion coefficients were measured, and compared.
The Effect of Amino Acids on the Retinal Chromophore in Photoreceptor Protein Rhodopsin
Tomohiro Nakamura, Yousuke Kataoka
PDF   Abstract
We investigated the effect of amino acids on the stability and the abosorption spectrum of the retinal chromophore in photoreceptor protein rhodopsin. In this study, we performed ab initio Molecular Orbital calculations using Hartree-Fock method and semi-empirical Method using INDO method.
Investigation of the Interaction Energies between Alumina and Carbon in AG Refractory
Fumihiko Asanuma, Yousuke Kataoka
PDF   Abstract
We have examined carbon-bond by estimating interaction energies between alumina (aluminum oxide) and carbon in AG refractory by using Molecular Orbital method with generic quantum chemistry calculation program“Gaussian 03 for Windows”. We consider the state of the carbon-bond is not O-Al-C but Al-O-C on the basis of calculated energy interactions.
Gas-liquid Critical Point and Diffusion Coefficient of Potassium Chloride and Sodium Chloride by Molecular Dynamics Simulation
Takaaki Imai, Yousuke Kataoka
PDF   Abstract
In this paper KCl and NaCl are researched at very high temperature and pressure by using molecular dynamics simulation (MD). We estimate properties of critical point and diffusion coefficient from MD simulation results. The MD simulation is effective to estimate properties with literature properties.
Non-abelian Reciprocity Laws
Seiken Saito,Toyokazu Hiramatsu
PDF   Abstract
One of the main issues of mathematics in 21st century is a development of “non-abelian mathematics” in contrast to abelian mathematics which is first named by A. Weil. This contrast between abel and non-abel may be considered in engineering to the contrast between linear and non-linear. For instance the approximation of non-linear control by linear control is corresponded to the structure of the solvable groups consisting of finite abelian steps. We remark that any problems cannnot be solved by such linearlization or abelianization. In this article we study non-abelian properties of the quintic equation
x5 - x - 1 = 0
of which Galois group over Q is the symmetric group S5. Towards a non-abelian reciprocity law, we describe a necessary and sufficient condition when a prime splits completely in Q(θ) with a root θ of x5 - x - 1, and show a table of the splitting primes p < 106.
Relative Operators of Pattern Formation that Uses Reaction-Diffusion System
Yusuke Shimada, Seiji Sadamori,Mutuo Sasano
PDF   Abstract
Reaction-diffusion systems are not so well known tool for a study of the formation of many patterns. Both static and dynamic patterns found in biology can be imitated very realistically by reaction-diffusion systems. In this paper, we use the S-system which is reaction-diffusion model of the pattern formation to analyze the interaction mechanism. As the research of a past reaction-diffusion systems has been researched in the interaction of two reactive materials, then, we will analyze the pattern formation of complex interaction in the case of increasing the number of reactive materials.
Research on Discrete Analysis Method of Infinitesimal Element Model
Junya Aono, Nagayuki Yoshida
PDF   Abstract
While it is accompanied by some fracture phenomena in the disasters such as an earthquake, because it tried to analyze it in a method for analyzing a continuum, a sufficient analys is result could not be gained. Therefore we take a new approach on the whole domain of deformation from an elastic continuity and plastic deformation and discrete particles. We simulated by using this mode on the bending failure test of concrete beams.
Study on the Water Balance and Runoff Characteristics in Nogawa Basin Using Analytical Hydrological Models
Ryo Yamazaki,Hideaki Takusari,Yasumiti Oka,Koji Koderaa
PDF   Abstract
This paper discusses the applicability of a distributed runoff model considering interflow process with lumped storage-discharge functions, to an urbanized study area, Nogawa basin. In addition, a physically-based model considering soil moisture and groundwater is introduced to grasp the subsurface water movement phenomena. As a result, estimated model parameters are consistent with the basin geological database and land use conditions. Also, through water balance and runoff analyses using above two models, basin characteristics relevant to surface and subsurface flow during rainfall are quantitatively evaluated to some extent.
A Trial study on Streetscape Evaluation by Virtual Space
Kiyoaki Yamashita, Norimichi Ishida
PDF   Abstract
Purpose of this study is to examine whether civil engineers in the field of construction can use Vision Dome System. In resent years, remarkable development of technologies in virtual reality has been observed. Vision Dome is one of those latest technologies. Vision Do me can project spectacle images observed from various viewpoints in a 3D structural model to the hemisphere screen, which gives observers an immersive feeling. To establish the usage of Vision Dome, we first made a 3D model of Koganei campus. Then we research and examined the observer’s reaction to confirm the effects of Vision Dome. Next, we aimed to apply the remarkable function of Vision Dome to the streetscape evaluation, and create 3D virtual street models, which do not exist in real world. We used this model to take questionnaire with SD method from observers. And finally, we clarify the influence of some street elements to the streetscape.
Nondestructive Inspection of DC/DC Converter by Modal Wavelets Analysis
Yu Usuda, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
Modern microelectronics has made it possible to work out a lot of many small electronics, such as electronic, calculator, radio, notebook computer and so on. As a result, electronics circuits have become small integrated circuits. This means that precise micron level inspecting technique should be exploited to produce the highly reliable electronics products. In this paper, we apply the thermal infrared image method to the electronic circuit boards inspection. Our infrared dynamic image method plans to work out the extraction of fault parts from dynamic infrared image by applying modal wavelets transform. As a first step of this project, this paper demonstrates the usefulness of dynamic infrared image method to the nondestructive inspection of power supplies utilizing film type transformer.
Three Dimensional Current Visualization by Semi-three Dimensional Model
Yukihiko Anabuki, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
In recent years, faulty operation by mutual interference among electric and electronic devices has become a social problem, which is occurred by widely spreading in use of the personal computers and cellular phones. This is a typical EMC(Electromagnetic Compatibility) problem. The electromagnetic field visualization in the electronic devices is of paramount importance to checking up the EMC problem for developing and designing the modern electronic devices. We have studied the visualization of the current distributions from the locally measured magnetic fields. In order to visualize the current distributions, it is intrinsically reduced into solving an ill-posed inverse problem. In this paper, we carried out the estimation of the three-dimensional current vector distributions with GVSPM method of inverse problem from the locally measured six two-dimensional magnetic fields around the square cubic box.
Smart Visualized Magnetic Sensor Signal Processing
Kensaku Kawamura, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
After Newton mechanics had been established, major effort of human innovation had been devoted to enforce the human physical power, such as hand, foot and fighting power by many physical tools and mechanical devices. After spreading use of digital computers, most of the human innovative efforts are now devoting to work out the artificial human brain or compensative tool of human brain works. In the present paper, one of the methodologies to carry out the line signal diagnosis is proposed based on the some assumptions in natural phenomena.
Visualization of Moving Object by Wave Equation
Yuji Kimura, Seijii Hayano, Yoshifuru Saito
PDF   Abstract
To work out a tough and economical automatic cans classification system, we have previously proposed a magnetic sensor system along with signal visualization methodology. Even though this system is tough and economical, relatively long CPU time is required to visualize the sensor signals. To overcome this problem, in this paper, we have tried to find the characterizing parameters of cans. As a result, it is found that the characterizing parameters of cans are simply the length evaluated by the visualized wave forms. Increasing the sensor coils along with the target cans passing through the sensor coils makes it possible to evaluate the length of cans. Thus, we have succeeded in developing the second stage of the full automatic metallic cans classification device.
Geometrical Complexity Extraction by Discrete 2nd Order Fourier Transform
Toru Kosugiyama, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
Most of the conventional image cognition methodologies are based on the geometrical singular points extraction of an image. This method has problem that requires the definition what is the singular point of image also the way how to extract the singular point.To remove this difficulty, we have proposed the Eigen pattern method that was based on color information of images. Even though Eigen pattern method has been successfully applied the image cognition, image diagnosis and so on, it has been pointed out that the Eigen pattern method lost the original geometrical information of target image, i.e., geometrical complexity. To overcome this problem, this paper proposes that the geometrical information or complexity of image is represented by means of the modified Fourier power spectrum histogram.
Visualization of Magnetic Sensor Signal and its Application
Tatsuya Yamashita, Seiji Hayano, Yoshifuru Saito,Kiyoshi Horii
PDF   Abstract
In recent years, advanced transport system such as high speed rail ways in the town and expressways connecting among big towns strongly requires to install the various sensors in particular velocity and acceleration sensors on their ways to govern and monitor the flow of traffic stream.Up to now, it is possible to use various types of velocity and acceleration sensors. We have employed two typical sensors in this paper. One is a fixed type to the way and is possible to measure the exact speed as well as acceleration vectors. The other is a removable type to any location and is available to measure the instantaneous speed as well as acceleration vectors. The fixed type is a magnetic sensor, which equips the sensing or picking up coils, and has reasonable tough property to the mechanical and environmental conditions, but does not have high sensibility at low speed. The other is a CCD camera, which makes it possible to measure any low speed but is difficult to measure high speed over the frame rate speed limitation.To visualize the speed and acceleration vectors under any conditions, we propose a hybrid measuring system combining both magnetic and CCD image sensors. Initial experiments demonstrate the usefulness of our system.
Advanced 3 Phase Magnetic Sensor and its Application to Defect Visualization of Thin Metallic Materials
Kohei Sato, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
This paper proposes a three phase magnetic sensing system which makes it possible to detect the defect, bending and deflection of metallic plate. Operating principle of this system is based on the essential nature of three phase transformer circuit. When balanced three phase currents are fed into the primary coils which work as the sensing part, zero phase voltage is detected if the target, i. e. secondary circuits have defects. Zero phase voltage is not detected if the target has no defects. Distribution of these zero phase voltages visualize the defect, bending and deflection of the metallic materials.
The Electric Current Measurement with a Differential Coil Method
Yasuhiro Mamada, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
Previously, we have proposed a method of current carrying coil position searching by means of a pair of differential search coils. By means of this new method, it has been clarified that the electric power lines in the inaccessible area such as in the wall and under the ground could be principally identified. In the present paper, we have developed a new theoretical approach to this differential coil method. This new theoretical approach makes it possible to evaluate the current currying coil position as well as magnitude of the flowing currents. Thus, we have succeeded in visualizing the electric power lines embedded into the wall and ceiling by measuring the magnetic fields at the accessible space in the rooms.
Estimate of B-H Characteristics from Visualized Magnetic Domain Images by Bitter Method
Tadaharu Fujisaku, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
The Bitter method is most easily observing way of the magnetic domains even though it is limited to the surface. To observe the magnetic domains by Bitter method, magnetic liquid is put on the target magnetic material after electrical field polishing process. Applying magnetic field to this magnetic material covered by magnetic fluid makes it possible to observe the magnetic domain dynamics by a microscope. Principal purpose of this paper is to develop a magnetization measurement device for quality control of the magnetic materials by visualizing the magnetic domains by Bitter method. As a first step of our project, we reveal that local magnetization characteristics could be evaluated by means of the Bitter method.
Visualization of Nonlinear Phenomena in Ferroresonant Circuit
Yuji Tanaka, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
This paper studies a typical ferroresonant circuit to visualize a regularity of nonlinear systems. At first, a Chua type magnetization model is outlined along with the nonlinear parameters: permeability μ, reversible permeability μ and hysteresis parameter s, independent of the past magnetization history. Second, we employ the iterative backward Euler method for the transient analysis of this initial value problem. The characteristic values of the state transition matrix are calculated in each of iteration step as well. Finally, visualization of the time varying characteristic values clarifies the stable system situation during the chaotic phenomenon exhibiting.
Visualization of 1/f Frequency Component in Dynamic Image of Natural Phenomena
Masaaki Teranishi, Seiji Hayano, Yoshifuru Saito
PDF   Abstract
Most of the natural phenomena include a time fluctuating component. Frequency analysis of this time fluctuation component leads to the famous “1/f fluctuation” characteristic that gives mental as well as psychological relaxation effects to human. Because of wide spreading electrical power supply, modern residence removes the combustion utilities and installs much electricity. Our target in this paper is to propose the method of frequency characteristic extraction from dynamic burning flame image of candle. As a result, one of the methods proposed in this paper enables us to extract major frequency characteristic of lighting sources. The other one makes it possible to visualize the precise frequency characteristic of lighting sources.
Development of Hybrid-type Penalty Method Assumed Third-order Displacement Field
Riichi Mihara, Norio Takeuchi
PDF   Abstract
In this paper, we propose the hybrid-type penalty method (HPM) assumed third-order displacement filed with the rigid displacement, strain and strain gradient at the arbitrary point in sub-domain. In this model, it applies the concept of the spring of RBSM in Lagragian multiplier. In addition, compatibility of the displacement on the element boundary edge is approximately introduced using the penalty as a spring constant. First, it shows the brief formulation of the present method, and analyzes problems such as simple stress state. From these results, it examined accuracy of the solution by HPM in using proposed displacement field. The numerical result for displacement and stress by HPM using third-order displacement field is the accuracy which is equivalent to FEM. It is possible to improve the accuracy, if the displacement field of high order is used according to the method for proposing here.
3-Dimensional Non-Linear Analysis of Prestressed Concrete Frame of Slope Protection by Using Finite Element Method
Riichi Mihara, Norio Takeuchi, Morito Kusabuka
PDF   Abstract
The PC frame-anchor method of construction has the structural characteristics which combined the properties that the energy consumption of the PC structure is about 1/2 of the steel structures and the resistance power of the ground anchor can controls part or all of the landslide motion. However, there is comparatively little research on the PC frame recently. In this research, it carries out the three-dimensional non-linear analysis of the PC frame of slope protection by using FEM, and it make comparative study of the state of stress distribution and the crack initiati on for the PC frame with experimental results.
Application of Information Criterion to Optimized Models for Data Compression by Wavelets
Sawa Matsuyama
PDF   Abstract
A suitable selection of base functions for discrete wavelets transform is a difficult problem for data analysis. The grouping frequencies derived from the analysis are often dependent on the base functions and a selection of the base functions has been made mostly by trial and error. On the selection of the most suitable model from several statistical models, the model of which AIC (Akaike Information Criterion) is minimum, is selected as the suitable model. In this study, the AIC is applied as the methodology for selecting the most suitable model for data compression on wavelets transform, that is, the compressions of three and four dimensional data are made by wavelets transform, and the minimum AIC model is selected as the suitable one. As the application, the same method is used for analysis of the wind victor data on the earth, and it reveals to be valid for an evaluation of the efficiency of data compression. The suitable selection of the base functions, which reflects a characteristic of the data, is constructed by the relation between the order of the base functions and the suitable model selected by AIC.
Nature of Nowaday Students at Computer Literacy Class
Norimichi Ishida
PDF   Abstract
We had made “attendance system attached face image” by Perl last year. Sitting position is important notice to attitude to attend a lecture in classroom computer literacy. It is emerged with the relationship between score and seat position. And we want to know how to get information and communication in daily life. So, we try to take a questionnaire for analyze about information society. As the results, almost student have a cell phone attached camera. We want to use a digital data include cell phone camera next semester for motivational class.