更新情報
第2回
Computational Method in Building Database for Crack shape Recovery Arising in Eddy Current Testing
著者:
Fumio KOJIMA
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公開日:
キーワードタグ:
database Eddy current testing (ECT) finite element method (FEM) parallel virtual machine (PVM) simulation
Fumio KOJIMA
発刊日:
公開日:
キーワードタグ:
database Eddy current testing (ECT) finite element method (FEM) parallel virtual machine (PVM) simulation
Abstract: This paper is concerned with computational method in building database, called ECT data base, which is used in crack shape recovery arising in eddy current testing. Firstly, ECT simulat ion model with nodal-based FEM is introduced. Secondly, computational method using parallel virt ual machine in building ECT database is overviewed. Finally, usage of this database is discussed....
英字タイトル:
Computational Method in Building Database for Crack shape Recovery Arising in Eddy Current Testing
英字タイトル:
Computational Method in Building Database for Crack shape Recovery Arising in Eddy Current Testing
第3回
ECT センサロボットによる欠陥形状検査システムの開発
著者:
小林 太,Futoshi KOBAYASHI,小島 史男,Fumio KOJIMA,中塚 恆,Hisashi NAKATSUKA
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Crack Shape ECT Inspection Robot Inspection System
小林 太,Futoshi KOBAYASHI,小島 史男,Fumio KOJIMA,中塚 恆,Hisashi NAKATSUKA
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Crack Shape ECT Inspection Robot Inspection System
This paper deals with a recovery method of a crack shape for preventive maintenance of power plant. In order to detect a crack and recover of its shap e automatically, we develop a mobile robot with ECT (Eddy Current Testing) sensor composed of a transmitter-receiver coil probe. ECT is a major techn ique for detection of surface and subsurface cracks found out in structures of the power plant. The robot detects a crack by ECT sensor signals, local izes the crack and recover its shape by rough and fine insp...
英字タイトル:
Development of Crack Shape Inspection System with ECT Sensor Robot
英字タイトル:
Development of Crack Shape Inspection System with ECT Sensor Robot
第9回
EMAT の磁性体内における超音波発生メカニズムのシミュレーション
著者:
伊藤 崇文,Takafumi ITO,小島 史男,Fumio KOJIMA
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キーワードタグ:
Condition Monitoring Magnetostrictive Force Nondestructive Inspection Nonlinear Magnetic Field 1
伊藤 崇文,Takafumi ITO,小島 史男,Fumio KOJIMA
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Condition Monitoring Magnetostrictive Force Nondestructive Inspection Nonlinear Magnetic Field 1
This paper is concerned with mechanism of ultrasonic test signals in magnetic materials using electromagnetic acoustic transducer(EMAT). The co upling mechanism between the electromagnetic fields and the applied excitation of ultrasonic testing are investigated. First, a nonlinear magnetic mod el in two dimensions is presented for the coupling mechanism. Secondly, the coupling mechanisms in ferromagnetic materials are studied analytically an d numerically. The final part of this monograph is devoted to num...
英字タイトル:
Simulation on mechanism of ultrasonic test signals in magnetic materialsusing EMAT
英字タイトル:
Simulation on mechanism of ultrasonic test signals in magnetic materialsusing EMAT
第11回
EMAT を用いたガイド波送受信機構の解析
著者:
古澤 彰憲,Akinori FURUSAWA,森川 惇,Atsushi MORIKAWA,小島 史男,Fumio KOJIMA
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EMAT FDTD Method Guided Wave L-mode Structure Health Monitoring T-mode
古澤 彰憲,Akinori FURUSAWA,森川 惇,Atsushi MORIKAWA,小島 史男,Fumio KOJIMA
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EMAT FDTD Method Guided Wave L-mode Structure Health Monitoring T-mode
Abstract This paper is concerned with transmit-receive mechanism of the electromagnetic ultrasonic tran sducer (EMAT) for the guided wave. First, the three-dimensional guided wave propagation simulator is de veloped. This simulator calculates the particle velocity from the force which are excited by EMATs with FDTD method. Second, configuration of EMATs is designed based on our study of the excitation mechanism of an EMAT, in order to transmit and receive the longitudinal mode (L-mode) or the torsional mod...
英字タイトル:
Analysis of transmit-receive mechanism of EMAT for the guided wave
英字タイトル:
Analysis of transmit-receive mechanism of EMAT for the guided wave
第6回
EMAT を用いた配管減肉寸法計測法
著者:
小坂 大吾,Daigo KOSAKA,小島 史男,Fumio KOJIMA,山口 紘史,Hiroshi YAMAGUCHI
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Damage Detection Inspection Nondestructive evaluation Sensor technology Structural integrity
小坂 大吾,Daigo KOSAKA,小島 史男,Fumio KOJIMA,山口 紘史,Hiroshi YAMAGUCHI
発刊日:
公開日:
キーワードタグ:
Damage Detection Inspection Nondestructive evaluation Sensor technology Structural integrity
his paper is concerned with quantitative evaluation of corrosion shape on outer surface of Pipe by Electro agnetic Acoust ic Transducer (EMAT). The pipe wall thinning was modeled semi ellipse shape. And FAC s been considered more dangerous. Th e pipe wall thinning was able to be measured with precision. In neral, FAC had a smooth surface wall thinning. EMAT were a ble to measure the echo in the test piece with 11 thinning of smooth enough. The EMAT is able to use to test for the FAC....
英字タイトル:
Measurement method of Pipe Wall Thinning Shape by EMAT
英字タイトル:
Measurement method of Pipe Wall Thinning Shape by EMAT
第7回
FDTD法を用いたガイド波検査シミュレータの構築とその非破壊検査への応用
著者:
小島 史男,Fumio KOJIMA,古澤 彰憲,Akinori FURUSAWA,長谷 一輝,Kazuki HASE
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公開日:
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Identification Nondestructive testing Numerical analysis Simulation
小島 史男,Fumio KOJIMA,古澤 彰憲,Akinori FURUSAWA,長谷 一輝,Kazuki HASE
発刊日:
公開日:
キーワードタグ:
Identification Nondestructive testing Numerical analysis Simulation
This paper is concerned with development of guided wave simulator on piping diagnostic system. First, a mathematical model of inspe ction procedures is described by a set of dynamical linear elastic equations in three spatial dimensions. Secondly, the numerical s cheme of the inspection model is given by using FDTD method. Finally, some numerical experiments are shown in order to assure the ap plicability of the proposed scheme to piping test. ...
英字タイトル:
Development of Guided Wave Simulator using FDTD method and its Application toNondestructive Testing
英字タイトル:
Development of Guided Wave Simulator using FDTD method and its Application toNondestructive Testing
第11回
L モードガイド波による配管減肉の位置と深さ推定..
著者:
中島 大岳,Hirotaka NAKAJIMA,古澤 彰憲,Akinori FURUSAWA,小島 史男,Fumio KOJIMA
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Dispersion Curve FAC Group Velocity Longitudinal Mode Structure Health Monitoring
中島 大岳,Hirotaka NAKAJIMA,古澤 彰憲,Akinori FURUSAWA,小島 史男,Fumio KOJIMA
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Dispersion Curve FAC Group Velocity Longitudinal Mode Structure Health Monitoring
The aim of this work presented here is to demonstrate the method for estimating the pipe wall thinning configuration: location, width, depth of pipe wall thinning in straight pipe based on velocity dispersions of longitudinal guided wave. First, group velocity dispersion curve is derived from frequency equation. Second, group velocity of longitudinal guided wave is analyzed using guided wave simulator for pipe with notch-shaped and ellipse-shaped circular pipe wall thinning. Finally, method for estimat...
英字タイトル:
Estimation of the Pipe Wall Thinning Configuration Based on Velocity Dispersions of Longitudinal Guided Wave
英字タイトル:
Estimation of the Pipe Wall Thinning Configuration Based on Velocity Dispersions of Longitudinal Guided Wave
第10回
POD 法による配管減肉検査の信頼性評価法と ハザードレートへの適用
著者:
中本 裕之,Hiroyuki NAKAMOTO,小島 史男,Fumio KOJIMA,加藤 翔,Sho KATO
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公開日:
キーワードタグ:
hazard rate pipe-wall thickness measurement probability of detection reliability assessment
中本 裕之,Hiroyuki NAKAMOTO,小島 史男,Fumio KOJIMA,加藤 翔,Sho KATO
発刊日:
公開日:
キーワードタグ:
hazard rate pipe-wall thickness measurement probability of detection reliability assessment
This paper proposes a method of applying a reliability of inspection data to a calculation of hazard rate. First, the probability of detection (POD) is calculated from inspection data of thickness measurement of pipe wall by an ultrasonic thickness meter. The inspection data are collected from experiments by qualified or unqualified inspectors. The POD outputs probabilities of reliability assessment based on the inspection data. Second, the probabilities are used for a timing estimation of pipe hazard....
英字タイトル:
Reliability assessment for thickness measurements of pipe wall using probability of detection and application to hazard rate
英字タイトル:
Reliability assessment for thickness measurements of pipe wall using probability of detection and application to hazard rate
第6回
Sizing methodology of pipe wall thinning using inverse analysis with EMAT signal
著者:
NGUYEN Thanh Duong ,Fumio KOJIMA
発刊日:
公開日:
キーワードタグ:
elastic wave non-destructive testing proper orthogonal decomposition Ultrasonic
NGUYEN Thanh Duong ,Fumio KOJIMA
発刊日:
公開日:
キーワードタグ:
elastic wave non-destructive testing proper orthogonal decomposition Ultrasonic
This paper proposes a method for sizing pipe wall thinning, using pulse-echo EMAT modes. First, the proposed method deploys a compact simulator model to eff iciently reduce the computational cost of EMAT forward analysis. Then, an approach of signal processing based on peak values at back-wall echo and POD method is applied to EMAT signal are introduced. Finally, inverse analysis based on reduced POD basics is applied for defect parameters identification. Promising e xperimental results with high accuracy ...
英字タイトル:
Sizing methodology of pipe wall thinning using inverse analysis with EMAT signal
英字タイトル:
Sizing methodology of pipe wall thinning using inverse analysis with EMAT signal
第6回
その場計測による回転機のモニタリング
著者:
宇佐美 照夫,Teruo USAMI,小島 史男,Fumio KOJIMA
発刊日:
公開日:
キーワードタグ:
Monitoring Noise Plant Preventive Maintenance Rotating Machine
宇佐美 照夫,Teruo USAMI,小島 史男,Fumio KOJIMA
発刊日:
公開日:
キーワードタグ:
Monitoring Noise Plant Preventive Maintenance Rotating Machine
This study reports the development of automatic condition monitoring techniques and system. The techniques and the system have been developed to test industrial motors by their sound signals. In this study, several kinds of defects in motor can be detected using monitoring techniques. The programs make possible to compute diagnostic algorithm and to practice judgments correctly. This new condition monitoring method will be tested in some plant s and will be also applied to preventive maintenance for not on...
英字タイトル:
Monitoring of Rotating Machine in Plants
英字タイトル:
Monitoring of Rotating Machine in Plants