第9回
Application of Microwaves on Remote and Nondestructive Testing of both Biofouling and Wall Thinning inside a Metal Pipe
著者:
劉 臨生,Linsheng LIU,佐々木 幸太,Kota SASAKI,遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME
発刊日:
公開日:
キーワードタグ:
The authors have already proposed microwave nondestructive testing (NDT) method on detecting both location and degree of a pipe wall thinning (PWT) inside a metal pipe. However, problems caused by iofouling inside metal pipes are also frequ ently reported in recent years. As the existence of biofilm inside a aveguide will change its wave impedance and also cause microwave reflections, the characteristic signals of iofilm defects are studied here to distinguish the biofilm and PWT defects. A pair of coaxial...
英字タイトル:
Application of Microwaves on Remote and Nondestructive Testing of both Biofouling and Wall Thinning inside a Metal Pipe
第2回
BWR の保全活動におけるコストおよびリスクの同時評価手法の構築
著者:
白石 夏樹,Natsuki SHIRAISHI,高橋 信,Makoto TAKAHASHI,橋爪 秀利,Hidetoshi HASHIZUME
発刊日:
公開日:
キーワードタグ:
The purpose of this study is to develop an evaluation method to optimize both cost and risk in maintenance strategy of BWR plant in long-term operation. Plant operation is simulated in a simplified model, and the condition of the components treated in the model are evaluated statistically with Monte Carlo simulation. While Probabilistic Safety Assessment(PSA) methods such as Fault Tree Analy sis(FTA), Event Tree Analysis(ETA), and Failure Mode and Effects Analysis(FMEA) are also used to estimate Core Damag...
英字タイトル:
Development of an Evaluation Method for Cost and Risk in Maintenance Strategy of BWR
第3回
Evaluation of Crack Location in Straight Pipe by Using Microwave
著者:
Abbasi KAVOOS,Ito SATOSHI,Hashizume HIDETOSHI
発刊日:
公開日:
キーワードタグ:
Abstract. A NDT method using electromagnetic waves has strong possibility for crack dete ction in large structure such as large pipes. In this study, electromagnetic wave with a TM0,-mode is used for detecting a circumferential crack and also time of flight (TOF) of the electromagnetic wave in several pipes is evaluated to determine the crack location....
英字タイトル:
Evaluation of Crack Location in Straight Pipe by Using Microwave
第9回
Investigation on electromagnetic characteristics numerical simulation by eddy current testing
著者:
王 晶, 遊佐 訓孝, Noritaka YUSA, 潘 紅良,橋爪 秀利,Hidetoshi HASHIZUME, Mika KEMPPAINE,Nlikka VIRKKUNEN
発刊日:
公開日:
キーワードタグ:
The present study discusses electromagnetic characteristics of modeling thermal fatigue crack in numerical simulation from view point of eddy current testing. Two thermal fatigue cracks introduced into SUS304 stainless steel plates are investigated. Eddy current signals are gathered by a differential plus point probe with several frequencies, 50 kHz, 100 kHz and 400 kHz. In the numerical simulation thermal fatigue crack is modeled as a region with constant width, true profile revealed by results of destruc...
英字タイトル:
Investigation on electromagnetic characteristics numerical simulation by eddy current testing
第15回
Probability of detection analysis of ultrasonic NDT applied to austenitic stainless steel welds
著者:
Siqi Meng ,(東北大/ 青島科技大), Haicheng Song,Noritaka Yusa,Tetsuya Uchimoto,Toshiyuki Takagi ,(東北大) ,Yuanjin Ling,(青島科技大),Hidetoshi Hashizume ,(東北大)
発刊日:
公開日:
キーワードタグ:
This paper evaluated the probability of detection(POD) of austenitic stainless steel welds from the viewpoint of ultrasonic testing. It presents results of simulation-based POD curves of ultrasonic NDT. The simulation model based on a three-dimensional Finite Element Method (FEM) is presented to perform the data generation. Results of conventional POD considering the depth of flaw are given and the requirement of taking the length of flaw into considered is determined....
英字タイトル:
Probability of detection analysis of ultrasonic NDT applied to austenitic stainless steel welds
第9回
オリフィス下流高速気液二相流および液膜からの液滴発生の可視化計測
著者:
江原 真司,Shinji EBARA,梅原 真弘,Masahiro UMEHARA,橋爪 秀利,Hidetoshi HASHIZUME
発刊日:
公開日:
キーワードタグ:
Abstract Liquid droplet impingement (LDI) erosion can never be caused when there is not any liquid droplet in a piping system. In this study, the liquid droplet generation from l iquid film formed downstream an orifice in a pipe was studied experimentally and visualized by using a high-speed camera. Water-air two-phase flow was supplied to the orifice and liquid film was formed in the recirculation region downstream the orifice. It was found from the experiment that the liquid film was entrained by the fas...
英字タイトル:
Visualization Experiment of High-speed Gas-liquid Two-phase Flow and Liquid Droplet Generation from Liquid Film downstream of an Orifice
第12回
マイクロ波を用いたクラックレーダーにおける 入射部構造の最適化
著者:
Grzegorz BYTNIEWSKI,佐々木 幸太,Kota SASAKI,遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME
発刊日:
公開日:
キーワードタグ:
This paper reports the optimization of a new microwave probe for the nondestructive testing of an inner wall surface of the pipe, which is one of a novel long-range inspection. The method propagates a microwave inside a pipe to detect defects appearing the inner surface on the basis of the reflection of the microwave due to the defects. In order to propagate microwave into a pipe efficiently, the optimization based on the reflection and transmission characteristics at the probe obtained by the two-dime...
英字タイトル:
Structure Optimization of the Excitation Probe in Crack Rader Using Microwave
第14回
マイクロ波を用いた配管広域一括探傷技術のエルボ付配管への適用性評価 Evaluation of the Applicability of a Nondestructive Testing Method using Microwaves to the Long-range Inspection of a Pipe with a Bend
著者:
佐々木 幸太,Kota SASAKI,片桐 拓也,Takuya KATAGIRI,遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME
発刊日:
公開日:
キーワードタグ:
This study evaluates the applicability of a nondestructive testing method using microwaves to the long-range inspection of a pipe with a bend. Experimental verifications were performed using four 1 m pipes, with an inner diameter of 23 mm, connected with flanges and a 90-degree bend. The experimental verifications confirmed clear reflections due to artificial wall thinning, simulated by a short pipe with an inner diameter larger than 23 mm, even when the wall thinning was situated directly below the ben...
第14回
マイクロ波を用いた配管広域一括検査技術の開発
著者:
橋爪 秀利,Hidetoshi HASHIZUME,遊佐 訓孝,NoritaNa YUSA,佐々木 幸太,Kota SASAKI,片桐 拓也,TaNuya KATAGIRI
発刊日:
公開日:
キーワードタグ:
This paper introduces the recent progress in the development of a microwave nondestructive testing method, aiming at the rapid and long-range inspection of a pipe, in the authors’ group. ...
英字タイトル:
Development of a nondestructive testing method using microwaves to the rapid inspection of pipes
第7回
マイクロ波を用いた配管減肉の位置検出に関する基礎研究
著者:
酒井 康智,Yasutomo SAKAI,遊佐 訓孝,Noritaka YUSA,橋爪 秀利,Hidetoshi HASHIZUME
発刊日:
公開日:
キーワードタグ:
In this paper, inspection of the wall thinning in pipes with microwave is studied. Experimental v erifications are carried out to demonstrate that the response of microwave, time of flight, enabl es one to locate wall thinning. One of the advantages of this method is that whole pipe is evaluat ed at once Values of time of flight obtained by the experiments agree well with theoretical ones....
英字タイトル:
The basic study of microwave testing for locating wall thinning in pipes