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
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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3回
ECT による配管減肉率の評価
著者:
黄 皓宇,Haoyu HUANG,遊佐 訓孝,Noritaka YUSA
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宮 健三 Kenzo MIYA This study proposes an investment for the evaluation of tube wastage by eddy current testing. EC T signals of differential and absolute type bobbin probes are presented by numerical simulation method. The relationships between percentage of wastage and ECT signals (amplitude and phase) ar e shown. Noise from ECT is considered and the percentage of wastage is estimated from safe side....
英字タイトル:
Evaluation of Tube Wastage by Eddy Current Testing
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
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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)
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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5回
オンサイト非破壊検査用可搬型950keV XバンドライナックX線源
著者:
夏井 拓也,Takuya NATSUI,山本 智彦,Tomohiko YAMAMOTO,坂本 文人,Fumito SAKAMOTO,谷口 善洋,Yoshihiro TANIGUCHI,田口 博基,Hiroki TAGUCHI,遊佐 訓孝,Noritaka YUSA,上坂 充,Mitsuru UESAKA,福田 茂樹,Shigeki FUKUDA,明本 光生,Mitsuo AKEMOTO,田辺 英二,Eiji TANABE,森田 成基,Seiki MORITA
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吉田 光宏 Mitsuhiro YOSHIDA 山本 昌志 Masashi YAMAMOTO 中村 直樹 Naoki NAKAMURA ...
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Portable 950keV X-band Linac X-ray Source for On-site NDT
第6回
ポンプ軸受及びインペラの不具合の大きさと電磁診断技術の信号との相関関係
著者:
萱田 良,Ryo KAYATA,石川 達也,Tatsuya ISHIKAWA,堀内 隆夫,Takao HORIUCHI,真木 紘一,Koichi MAKI,遊佐 訓孝,Noritaka YUSA
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new electromagnetic method for the nondestructive evaluation of electric pumps with ball bearings is roposed. A permanent magnet generates a static magnetic field and a coil of several hundred turns wrapped round it is used to pick up eddy currents induced inside rotating ball bearings and impellers. First, a method hat make use of the autocorrelation is applied to the signals of the ball bearings. A relation between therocessed signals and the size of the defects in the bearings is obtained. In a second...
英字タイトル:
Electromagnetic Nondestructive Detection for Wounded Bearings and Impellers andCorrelation of Size of Defect and Signal
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
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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
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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
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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
論文
マイクロ波入射部最適化による マイクロ波探傷技術の高度化
著者:
佐々木 幸太,Kota SASAKI,遊佐 訓孝,Noritaka YUSA,若井 隆純,Takashi WAKAI,橋爪 秀利,Hidetoshi HASHIZUME
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Abstract: This study reports the development of a new microwave probe for the nondestructive testing of a pipe. Three-dimensional finite element simulations are carried out to optimize the profile of a microwave probe, whose results show that a probe with elliptic profile enables smaller reflection at the probes as well as much better single-mode propagation inside the pipe than conventional ones. Experimental validations are carried out using a straight brass pipe with an inner diameter of 39 mm and...
英字タイトル:
Enhancement of microwave nondestructive testing method for the inspection of pipes by optimizing the microwave probe profile