※一部利用できない機能があります
| 1.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
Recent papers by the authors have demonstrated the potential for providing rate-of-current-change (dl/dt) and current limiting protection for voltage source fed circuits through the use of a composite magnetic device. The
…
application of such a device is presently hampered by the limited choice of commercially available permanent magnet and low saturation flux density materials with square B/H loops. This paper examines the operation of the passive dl/dt or current limiter with a view toward specifying the desired geometric device profile and material characteristics. A voltage source inverter design example is used to illustrate the method by which the design parameters for the device would be specified.<br />Proceedings of the IEEE 4th Workshop on Computers in Power Electronics; Trois-Rivieres, Que, Can; ; 7 August 1994 through 10 August 1994; Code 42401
続きを見る
|
||||
| 2.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
This paper describes bare printed circuit board (PCB) inspection based on eddy-current testing (ECT) technique with high
…
scanning speed. A high-frequency ECT probe composed of a meander coil as an exciting coil and the spin-valve giant magnetoresistance (SV-GMR) sensor was fabricated and is proposed. The ECT probe was designed based on crack inspection over flat surface, especially suitable for microdefect detection on high-density bare PCB. The ECT signal detected by the SV-GMR sensor was acquired by high-speed A/D converter for applying the signal processing based on digital technique. Harmonic analysis based on Fourier transform was used to analyze the ECT signal at fundamental frequency in order to increase inspection speed and this technique allowed the ECT probe to scan bare PCB, with high sampling frequency and with high-spatial resolution inspection. Experimental results verified the possibility and the performance of the proposed PCB inspection system based on ECT technique. © 2007 IEEE.<br />Power Electronics and Drive Systems, 1997. Proceedings., 1997 International Conference on
続きを見る
|
||||
| 3.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史
概要:
This paper reports on the development of a new horizontal-shaft hybrid-type magnetic bearing system. The bearing system
…
will be used for a horizontal-shaft machine. The rotor is levitated due to the repulsive force between a stator and a rotor permanent magnet (PM). A lower cost and higher radial stiffness have been achieved by using a strontium-ferrite magnet on the rotor and an Nd-Fe-B PM above and below the rotor magnet. A finite-element analysis was performed to calculate the levitation force and radial stiffness. An upper stator magnet subtending an angle of 45° provides the best compromise between a large levitation force and radial stiffness. A model for the horizontal-shaft hybrid magnetic bearing system has been developed and includes the effect of the rotordynamics and the electromagnetic forces. An integral servocontroller was designed to stabilize the axial position. The controller has been implemented in a digital signal processor. Experimental results performed on a prototype system are in agreement with the theoretical results.<br />Third IEEE International Workshop on Electronic Design, Test and Applications, DELTA 2006; Kuala Lumpur; Malaysia; 17 January 2006 through 19 January 2006; Category numberP2500; Code 69206
続きを見る
|
||||
| 4.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史 ; 別所, 一夫
概要:
This paper presents a new 3-dimensional finite element analysis to ac electromagnetic machines with nonlinear magnetic characteristics in a steady state. The method enables us to calculate the time-periodic (non-sinusoidal)
…
characteristics in harmonic domain. Unlike the field calculations in time domain, we can obtain only the steady-state solution directly. The application of the parallel processing to this approach is discussed. The analyses of the inductor with shading coil and the model of the flux-concentration type electromagnetic pump are presented.
続きを見る
|
||||
| 5.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史
概要:
Static power converters are being used increasingly in power system applications. The power semiconductor switches within the converter systems must be rated to accommodate power system fault currents and system overvoltages.
…
Significant cost reductions can be attained by reducing the magnitude of power system fault currents. In this paper we propose the use of a novel passive current limiter to accomplish this task. The limiter consists of two magnetic devices connected in series and in magnetic counter opposition to each other. Each magnetic device consists of three slices of NdFeB permanent magnet material sandwiched between the three end poles of two ferrite E cores. Experimental and finite element results are presented and are found to be in good agreement with each other. The need for 3D modeling in the future is demonstrated. The operating characteristics of the current limiter are experimentally verified using a scaled down version of a power system.
続きを見る
|
||||
| 6.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史
概要:
A numerical method for solving electro-magnetically coupled problems with a magnetic nonlinearity such as hysteresis and eddy current is described in the form of matrix tableau equation, and its numerical procedure is shown. The
…
method has been applied to a magnetic pulse compression (MPC) circuit, which is made of saturable inductors and capacitors, and is used to laser and particle beam accelerator power supplies. Taking a model circuit of two-stage MPC circuit, the dependency of capacitor ratio was estimated, and the influence of eddy current in the circuit has been demonstrated numerically.
続きを見る
|
||||
| 7.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史 ; 松村, 文夫
概要:
Repulsive type magnetic bearing consisting of permanent magnets (PM) and controlled current electromagnets have the advantages of less number of electromagnets and simplified control circuit compared to active magnetic
…
bearing. The system is fundamentally unstable one and is very prone to disturbance. The shape and configuration of permanent magnet has a strong influence on the stability of the system. Two model of repulsive type magnetic bearing have been designed and fabricated in our laboratory. Repulsive forces and stiffness characteristics for different PM configurations have been studied and suitable configuration have been chosen. This paper investigates a method of disturbance attenuation and faster stabilization via permanent magnet configuration on repulsive type magnetic bearing.
続きを見る
|
||||
| 8.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史 ; 松村, 文夫
概要:
This paper reports on the development of a new repulsive type magnetic bearing system whose radial bearing section makes good utilization of the repulsive forces between stator and rotor permanent magnets resulting a simplified axial
…
control scheme. The shape and configuration of permanent magnet is the most critical component for satisfactory operation of this type of magnetic bearing. In this paper, modeling of the permanent magnets has been done with the help of finite element analysis and the nature of the repulsive forces and stiffnesses are estimated along the three directions. Using the forces and expressing the rotor dynamics the issue of modeling a real physical repulsive type magnetic bearing system is discussed. The controller has been configured around digital signal processor. A prototype model has been designed and fabricated in our laboratory and experiments are carried out.
続きを見る
|
||||
| 9.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
We present an eddy-current test (ECT) method for detecting conductive microbeads on a non-conductive substrate. A Helmho
…
ltz coil is used to generate an exciting magnetic field. The magnetic fields, generated by eddy-currents in a Pb-Sn microbead, are detected by a spin-valve giant magnetoresistive (SV-GMR) sensor. The experimental results are compared to an analytical solution for the magnetic field over the microbead. Early results for the detection of a grid of microbeads are also presented. © 2005 IEEE.
続きを見る
|
||||
| 10.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
This paper has reported the performance of a tubular linear induction motor based on the principle of flux-concentration by eddy currents. In the developed Flux-Concentration type Linear Induction Motor (FCLIM) the key element is the
…
conducting plate inserted between the exciting coils in each slot. In FCLIM the leakage flux is reduced and more flux is concentrated into the air gap . Thrust characteristics are compared using the equivalent circuit parameters and also verified experimentally. Some losses are occurred in the plate but the overall efficiency of the FCLIM is better at higher output force. The developed FCLIM is suitable for short linear motion and lower speed applications.
続きを見る
|
||||
| 11.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
Ferroresonance is a prolonged overvoltage condition that can damage transformers and other connected equipment. It can occur in the inductive voltage transformers as a result of the disconnecting of a busbar or a line section by
…
opening circuit breakers equipped with grading capacitors. Ferroresonance creates highly distorted waveforms, which can cause abnormally high overvoltages. The level of overvoltages depends on the system parameters and the values of those parameters therefore need to be known. Such knowledge is possible either by means of practical experiments or by computer analyses. Due to the fact that it is not possible to do a lot of practical experiments in a real power system, the second possibility prevails. In this paper some outputs of analyses performed in the MATLAB and Simulink environment are shown and results are discussed.
続きを見る
|
||||
| 12.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
This paper presents the utilization of spin-valve giant magnetoresistance (SV-GMR) as a sensor and Helmholtz coil as an exciter for detection of both single and array conductive microbead based on eddy current testing (ECT)
…
technique. The magnetic field distribution of the proposed ECT probe was calculated by finite element method (FEM). The experiment was performed to detect a single and array conductive microbead. The results enabled us to determine the position and achieve good level of signals.<br />Special Issue of the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM06)
続きを見る
|
||||
| 13.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
This paper describes high-speed printed circuit board (PCB) inspection based on eddy-current testing (ECT) technique. The proposed ECT probe consists only of meander exciter coil and multi spin-valve giant magnetoresistance (SV-GMR)
…
sensor that it was designed for detection of microcrack on PCB surface. To conduct high-speed scanning, harmonic analysis based on Fourier analysis is applied to acquire ECT signal at fundamental frequency. Signal variation at defect point is enhanced by applied averaging of multisignal obtained from the multi SV-GMR sensor.<br />Special Issue of the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM06)
続きを見る
|
||||
| 14.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
This paper reports an analysis of errors formed during an inspection of printed circuit boards (PCB). A unique probe sui
…
table for this inspection, has been fabricated. Although the probe has high sensitivity, there are some additional obstacles, which have to be overcome - signals' separation and removal of not constant offset voltage from the output signal. In order to avoid misinterpretations of the signal obtained, the phase characteristic has been taken into account. The data from the phase characteristic are combined with the data coming from the amplitude characteristic. Thereby, information about defects, obtained from phase characteristic, can be confirmed with the information about defects delivered by the amplitude characteristic. Experimental results presented in this paper show good accuracy of this analysis method.<br />特集 第9回MAGDAコンファレンス
続きを見る
|
||||
| 15.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史
概要:
Measurements of magnetic fields from nervous cells can transpire to be significant in not only diagnostics but also trea
…
tment of neurological diseases. The sensor for nerve magnetic field measurements must be capable of detecting very low signals in order of Pico/Femto Tesla and the measurements must be as non-invasive as possible. For this purpose needle type spin valve giant magnetoresistance (SV-GMR) sensor was fabricated. Thin wire of 15 μm radius with supplied pulse wave was used as a model of the nerve. External magnetic field created by current pulses in the nerve model can be measured by touching the needle of the sensor to the model. The proposed sensor is much easier and better adjustable to surgical conditions than so far suggested measuring techniques utilizing super conducting quantum interference devices (SQUIDs). Experiments show that pulse signals as low as 1μA can be measured.<br /><Special Issue>16th MAGDA Conference, Part II
続きを見る
|
||||
| 16.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉 ; 柿川, 真紀子
概要:
Utilization of magnetic nanoparticles in biomedicine has seen an unprecedented growth in recent years. The ability to accurately estimate magnetic nanoparticles inside small areas of the body provides an advantage in
…
hyperthermia therapy, a form of cancer treatment. This paper concentrates on a novel giant magnetoresistance (GMR) needle-type sensor to detect and estimate low concentration magnetic fluid inside minute agar cavities injected with magnetic fluid. Theoretical analysis, experimental results and information on the fabricated GMR needle-type sensor are reported. The experimental results show a favorable agreement to the analytical analysis, supporting the potential use of the GMR needle-type sensor in hyperthermia therapy.<br /><Special Issue>Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM08)
続きを見る
|
||||
| 17.
論文 |
論文
|
柿川, 真紀子 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 18.
論文 |
論文
|
柿川, 真紀子 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 19.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
Eddy currents induced on the surface depend on properties on near-surface of conductive materials and the arrangement between exciting coil, detecting sensor, and materials, as lift-off height and inclination. We apply the
…
multi-sensor probe for the applications of eddy-current testing to detect the center of small round metal. The measurement system detects the magnetic fields around the round metal simultaneously and estimates the gap and direction of axis eccentric. We describe the principle of detection and the experimental results.<br /><Special Issue>Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM08)
続きを見る
|
||||
| 20.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
Current suppression devices such as fault current limiter (FCL), which have high impedance under fault conditions and low impedance under normal conditions, are required to reduce excessive current in power distribution lines, when fault
…
such as short circuits occurs in large scale electric power systems. In this paper, to establish practical design method of magnetic FCL, the design and the characteristics of a prototype magnetic FCL of 2kVA order are investigated. And the loss mechanism of magnetic FCL is discussed for getting better the line current suppression characteristics.<br /><Special Issue>Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM08)
続きを見る
|
||||
| 21.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
This paper presents the application of giant magnetoresistance (GMR) sensor for micro material detection. The proposed ECT probe was fabricated for detection of conductive microbead by spin-valve type magnetoresistance (SV-GMR). The four
…
exciter coils (Helmholtz, ferrite core, flux concentrator and double spiral) were used to compare the conductive microbead detection of signals that were obtained from GMR sensor. Both of eddy-current testing (ECT) technique and static magnetic methods were applied to detect the ferromagnetic material. In addition, the two GMRs were used to detect the underground water velocity. The results enabled us to determine the position and achieve a good level of signals.<br /><Special Issue>Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM08)
続きを見る
|
||||
| 22.
論文 |
論文
|
山田, 外史 ; 岩原, 正吉
概要:
This paper presents a new high-throughput magnetic separator for biomaterials labelled by magnetic beads. The separator consists of three rectangular coils, two circular coils, and a separation chamber. These instruments were designed by
…
a numerical analysis of magnetic field and a movement of magnetic beads. A separation rate over 90% has been obtained in this system.<br />Special Issue of the Asia-Pacific Symposium on Applied Electromagnetics and Mechanics (APSAEM06)
続きを見る
|
||||
| 23.
論文 |
論文
|
Roy, Debabrata P. ; Akiyama, Yosuke ; Yamada, Sotoshi ; Iwahara, Masayoshi ; 山田, 外史 ; 岩原, 正吉
概要:
This paper has reported the development and performance of a flux-concentration type linear induction motor (FCLIM) utilizing the effect of flux-concentration by eddy currents. In the developed FCLIM, the slot-leakage flux is reduced and
…
as a result more flux is concentrated into the air gap. The key element of the FCLIM is the conducting plate inserted between the exciting coils in each slot. Thrust characteristics of conventional tubular LIM and FCLIM are compared using the equivalent circuit parameters. Though some losses are occurred in the plate, the overall efficiency of FCLIM is better at higher output force.
続きを見る
|
||||
| 24.
論文 |
論文
|
Taniguchi, T. ; Nakamura, K. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; 山田, 外史 ; 岩原, 正吉
概要:
This paper presents an image processing method for eddy-current testing for the detection of the defects with a specific orientation. The method utilizes the fact that a line-shaped signal is, through the Fourier transform, mapped onto a
…
line passing through the origin and perpendicular to the orientation of the original signal. Hence, nonseparable fan filters is used to select the frequency components corresponding to the defects orientated in a Specific direction. This approach enables more precise control of the extraction characteristics of signals compared to the iterative application of one-dimensional (1-D) filtering in the vertical and horizontal directions, in which the shape of the pass band is restricted to a geometry made from squares. The effectiveness of the proposed method is shown by a demonstration using a metallic sample with a defect aligned in a number of directions.
続きを見る
|
||||
| 25.
論文 |
論文
|
Mukhopdhyay, S.C. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; 岩原, 正吉 ; 山田, 外史
概要:
This paper has investigated the possibility of applying nondestructive evaluation technique for finding the defects in electroplated materials. Planar meander and mesh type magnetic sensors have been considered and their relative
…
performance have been compared based on a single criterion that the effective area of the material surface covered by each type of sensor is same.
続きを見る
|
||||
| 26.
論文 |
論文
|
Mukhopdhyay, S.C. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; 岩原, 正吉 ; 山田, 外史
概要:
For the last few years the authors have been involved in the design and development of different topologies of magnetic current limiter (MCL). The small scale laboratory models have been fabricated and experiments were conducted. The
…
simulated performance obtained from the tableau approach based on lumped parameter model shows discrepancy with the experiment. This paper describes the necessity of electromagnetic field computation which clearly shows the discrepancy between the observed and the simulation results, which can be attributed to a non uniform flux distribution in the core.
続きを見る
|
||||
| 27.
論文 |
論文
|
Kacprzak, D. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; 山田, 外史 ; 岩原, 正吉
概要:
This paper presents simulated amplitude and phase characteristics obtained during the inspection of printed circuit board by an eddy-current testing probe. The simulation is based on the "two-components" nature of the output signal.
…
Amplitude and phase characteristics, obtained during the experimental inspection and simulation, are presented.
続きを見る
|
||||
| 28.
論文 |
論文
|
Mukhopadhyay, S.C. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; Dawson, F.P. ; 岩原, 正吉 ; 山田, 外史
概要:
Different topological configurations for a passive magnetic current limiter consisting of a permanent magnet and saturable core are discussed in this paper. The models for a series/parallel biasing mode, and a single/three phase supply
…
system have been fabricated and the experiments have been carried out for the performance evaluation. Using tableau method, the transient performance of different models has been simulated. The feasibility of applying the current limiter for the protection of power semiconductor devices in moderately low voltage applications is investigated.
続きを見る
|
||||
| 29.
論文 |
論文
|
Ohji, T. ; Kano, M. ; Mukhopadhyay, S.C. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; 岩原, 正吉 ; 山田, 外史
概要:
A permanent magnet bearing (MB) system utilizing the repulsive forces operating between the stator and rotor permanent magnet for levitation and radial control has been fabricated in our laboratory, The consistency of the permanent magnet
…
magnetization effects the continuous steady-state and dynamic performance of the system. Since both the magnets are repelling each other, there will be demagnetization of the magnetization of the permanent magnet. Due to demagnetization or ageing or manufacturing asymmetry, the field distribution may not be uniform along the periphery of the magnet. In this paper the effect of this magnetization non-uniformity on the performances of the bearing system has been studied.
続きを見る
|
||||
| 30.
論文 |
論文
|
Kakikawa, Makiko ; Hosono, R. ; Hashimoto, S. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; 柿川, 真紀子 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 31.
論文 |
論文
|
Chomsuwan, K. ; Fukuda, Y. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; Wakiwaka, H. ; Shoji, S. ; 山田, 外史 ; 岩原, 正吉
|
||||
| 32.
論文 |
論文
|
Mukhopadhyay, S.C. ; Iwahara, Masayoshi ; Yamada, Sotoshi ; 岩原, 正吉 ; 山田, 外史
|
||||
| 33.
論文 |
論文
|
Hagino, T. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; 山田, 外史 ; 岩原, 正吉
|
||||
| 34.
論文 |
論文
|
Toyama, H. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; Roy, Debabrata P. ; Miya, K. ; 山田, 外史 ; 岩原, 正吉
|
||||
| 35.
論文 |
論文
|
Okada, T. ; Hussien, A. ; Ohji, T. ; Yamada, Sotoshi ; Iwahara, Masayoshi ; 山田, 外史 ; 岩原, 正吉
|
||||
| 36.
論文 |
論文
|
Yamada, Sotoshi ; Gooneratne, Chinthaka ; Iwahara, Masayoshi ; Kakikawa, Makiko ; 山田, 外史 ; 岩原, 正吉 ; 柿川, 真紀子
概要:
金沢大学理工研究域電子情報学系<br />出版社照会後に全文公開|許可を得て登録
|
||||
| 37.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史 ; 杉本, 博昭 ; 小嶋, 利幸
概要:
金沢大学理工研究域電子情報学系<br />This paper presents the numerical analysis of magnetic pulse compression circuit taking into accoun
…
t eddy current loss of core. In order to be clear the loss contribution to the circuit performance, the magnetic nonlinearity and eddy current effect of core has been considered in the analysis, and the analysis was performed numerically by use of tableau method. On the view of 1) energy transfer efficiency, 2) current gain and 3) pulse compression ratio, the circuit performance has been investigated on the initial voltage of the start-up condensor and the setup time of core flux.
続きを見る
|
||||
| 38.
論文 |
論文
|
間々田, 宏 ; 津山, 和信 ; 白石, 良一 ; 山田, 外史 ; 岩原, 正吉 ; 別所, 一夫
概要:
金沢大学理工研究域電子情報学系<br />The electromagnetic pump can transfer liquid metal in continuous close-circulating system. These pu
…
mps have higher reliability comparing with mechanical one. These features make the attractive pump suitable for transferring liquid sodium in fast breeder reactor. But in conventional electromagnetic pumps, a large-sized pump means a larger magnetic circuit length, then leakage flux between the slots is increased and the efficiency is reduced. Therefore, for transferring liquid sodium, we have developed "Flux-Concentration Type Electromagnetic Pump" that employs the magnetic shielding effect of eddy currents. This paper discribed the dynamic characteristics of the flux-concentration type electromagnetic pump taking account of driving frequency by both experiments and FEM analysis. We constructed the circulating system for liquid metal to measure the dynamic chatacteristics of electromagnetic pump. In experiment, we used low-temperature melting alloy named "U-alloy47" instead of sodium. As a result, this pump produced the pressure about up to 1.3 times in all range of flow rate. We simulated the frequency characteristics for the width of conducting plate by FEM analysis.
続きを見る
|
||||
| 39.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史
概要:
金沢大学理工研究域電子情報学系<br />情報機器の分散化・マルチメディア化にともない、情報の融合化が進んでいる。一方、映像メディア機器を始めとする様々な機器は情報機器とは別の発達をしてきたため独自のインタフェースを有し、情報機器と情報を相
…
互にやりとりする場合必ずしも適切に機能しない。そこで、本文では情報機器の情報交換性を高めるため情報機器を入力機器、制御機器、演算機器、情報保存機器、出力機器等の単位機能に分割して、それぞれを自立させて利用できるようにするためのコミニュケーションインタフェースプロトコルについて一つの方式を提案する。 This paper presents a proposal of generalized interface protocol assigned on request for information equipment as the input unit, control unit, arithmetic unit, information saving unit, output unit and others with a serial port. This protocol has a facility of negotiation and communication with each others, and automatically an equipment is recognized on demand to use the interface by the unit equipment like as a keyboard, a keypad, a remote controller, and others. Especially its protocols realize multi-purpose of computer display easily. E.g., the display could be used by a keyboard, a remote controller, a demand pad, a remote PDA simultaneously using this protocol.
続きを見る
|
||||
| 40.
論文 |
論文
|
谷口, 哲樹 ; 宮腰, 貴久 ; Kacprzak, Dariusz ; 山田, 外史 ; 岩原, 正吉
概要:
This paper presents an image processing method utilizing the wavelet transform (WT) for the inspection of printed circuit board (PCB) by using eddy-current testing (ECT) technique. First, undesired components in the ECT image, which
…
degrade the precision of the defect-detection, are removed through two types of filtering operations (based on frequency and amplitude, respectively) utilizing discrete WT. Considering that the ECT measurement is carried out horizontally, the proposed method applies WT only along that direction. Then, to estimate the existence and position of the defect, a correlation-based comparison is made between two images: the one is derived from a reference PCB (nondefect) and the other is from the tested object. The effectiveness compared with conventional approach and problem of the proposed method is investigated through examples of disconnection models.
続きを見る
|
||||
| 41.
論文 |
論文
|
間々田, 宏 ; 津山, 和信 ; 白石, 良一 ; 山田, 外史 ; 岩原, 正吉 ; 別所, 一夫
概要:
The electromagnetic pump can transfer liquid metal in continuous close-circulating system. These pumps have higher reliability comparing with mechanical one. These features make the attractive pump suitable for
…
transferring liquid sodium in fast breeder reactor. But in conventional electromagnetic pumps, a large-sized pump means a larger magnetic circuit length, then leakage flux between the slots is increased and the efficiency is reduced. Therefore, for transferring liquid sodium, we have developed "Flux-Concentration Type Electromagnetic Pump" that employs the magnetic shielding effect of eddy currents. This paper discribed the dynamic characteristics of the flux-concentration type electromagnetic pump taking account of driving frequency by both experiments and FEM analysis. We constructed the circulating system for liquid metal to measure the dynamic chatacteristics of electromagnetic pump. In experiment, we used low-temperature melting alloy named "U-alloy47" instead of sodium. As a result, this pump produced the pressure about up to 1.3 times in all range of flow rate. We simulated the frequency characteristics for the width of conducting plate by FEM analysis.
続きを見る
|
||||
| 42.
論文 |
論文
|
前田, 哲彦 ; 山田, 外史 ; 岩原, 正吉
概要:
Eddy current testing probe using flux concentration effect is investigated with numerical simulations and experiments. The flux concentration effect had been developed in the electromagnetic pump for pumping liquid sodium. Simulations
…
clarify distributions of eddy current in the sleeve with slit. The magnetic flux, which is penetrating the tube at the end region of sleeve with slit, is increasing. So this location is suitable for detecting. Experiments are carried out utilizing the eight-figure detecting coil. The experiments show that defects signals which were obtained using flix concentration effect are about twenty five times larger than the conventional type.
続きを見る
|
||||
| 43.
論文 |
論文
|
大路, 貴久 ; 東, 剛人 ; 井上, 裕章 ; 山田, 外史 ; 岩原, 正吉 ; 高田, 義博
概要:
The repulsive type magnetic bearing system, which has the passive control utilizing the repulsive forces and active control along axial direction, is superior compared to other magnetic bearings in respect to reduce the number of
…
peripheral devices. The repulsive type magnetic bearing has special features such as the soft and constant stiffness for passive control axes. Hence this system can be applied for a special device without impulse disturbance and mechanical contact for the levitator shaft. In this paper we make a proposition to apply to a thermobalance using the repulsive type magnetic levitation system. If our system can be applied, the accuracy of measurement and sensitivity will be high owing to null mechanical contacts of the levitator. This paper reports the configuration and noncontact levitation characteristics of the trial manufacture and introduces the differential thermobalance configuration made as a next plan.
続きを見る
|
||||
| 44.
論文 |
論文
|
中村, 和倫 ; 山田, 外史 ; 岩原, 正吉
概要:
金沢大学大学院自然科学研究科電子情報システム専攻<br />金沢大学自然計測応用研究センター<br />金沢大学工学部電気電子システム工学科
|
||||
| 45.
論文 |
論文
|
水野, 覚 ; 山田, 外史 ; 岩原, 正吉
概要:
金沢大学自然科学研究科電子情報システム専攻<br />金沢大学自然計測応用研究センター
|
||||
| 46.
論文 |
論文
|
秋山, 陽介 ; 山田, 外史 ; 岩原, 正吉
概要:
金沢大学自然科学研究科電子情報システム専攻/金沢大学自然計測応用研究センター/金沢大学自然計測応用研究センター
|
||||
| 47.
論文 |
論文
|
橋倉, 裕 ; 山田, 外史 ; 岩原, 正吉
概要:
金沢大学大学院自然科学研究科電子情報システム専攻/金沢大学自然計測応用センター/金沢大学工学部電気電子システム工学科
|
||||
| 48.
論文 |
論文
|
池田, 隆 ; 原田, 真市 ; 細野, 隆次 ; 柿川, 真紀子 ; 岩原, 正吉 ; 山田, 外史
概要:
金沢大学大学院自然科学研究科<br />金沢大学医学部研究教育機器センター<br />金沢大学医学部保健学科<br />金沢大学自然計測応用研究センター<br />金沢大学工学部電気電子システム工学科
|
||||
| 49.
論文 |
論文
|
前田, 航 ; 山田, 外史 ; 岩原, 正吉
|
||||
| 50.
論文 |
論文
|
金丸, 聡志 ; 柿川, 真紀子 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 51.
論文 |
論文
|
大橋, 陽介 ; 山田, 外史 ; 岩原, 正吉
|
||||
| 52.
論文 |
論文
|
柿川, 真紀子 ; 細野, 隆次 ; 橋本, 松進 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 53.
論文 |
論文
|
池田, 隆 ; 原田, 真市 ; 細野, 隆次 ; 柿川, 真紀子 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 54.
論文 |
論文
|
大橋, 陽介 ; 山田, 外史 ; 岩原, 正吉
|
||||
| 55.
論文 |
論文
|
柿川, 真紀子 ; 細野, 隆次 ; 橋本, 松進 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 56.
論文 |
論文
|
池田, 隆 ; 原田, 真市 ; 細野, 隆次 ; 柿川, 真紀子 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 57.
論文 |
論文
|
中村, 和倫 ; 山田, 外史 ; 岩原, 正吉
|
||||
| 58.
論文 |
論文
|
水野, 覚 ; 山田, 外史 ; 岩原, 正吉
|
||||
| 59.
論文 |
論文
|
秋山, 陽介 ; 山田, 外史 ; 岩原, 正吉
|
||||
| 60.
論文 |
論文
|
橋倉, 裕 ; 山田, 外史 ; 岩原, 正吉
|
||||
| 61.
論文 |
論文
|
池田, 隆 ; 原田, 真 ; 細野, 隆 ; 柿川, 真紀子 ; 岩原, 正吉 ; 山田, 外史
|
||||
| 62.
論文 |
論文
|
岩原, 正吉
|
||||
| 63.
論文 |
論文
|
岩原, 正吉
概要:
工学部電気電子システム工学科
|
||||
| 64.
論文 |
論文
|
岩原, 正吉
概要:
総合移転実施特別委員会 情報通信システム整備検討 ワーキンググループ
|
||||
| 65.
論文 |
論文
|
岩原, 正吉 ; 山田, 外史
概要:
工学部電気・情報工学科<br />工学部附属電磁場制御実験施設
|
||||
| 66.
論文 |
論文
|
岩原, 正吉
概要:
工学部電気・情報工学科
|
