| Basic Study on ECT Data Evaluation Method with Neural Network |
92 |
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| Authors:
H. Komatsu; Y. Matsumoto; K. Aoki; F. Nakayasu; M. Hashimoto
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 | At the in-service inspection of the steam generator (SG) tubings in PWR plants, eddy current testing (ECT) has been widely used at each outage. At present, ECT data evaluation is mainly performed by ECT data analyst, therefore it has the following problems: 1) Only ECT signal configuration on the impedance trajectory is used in the evaluation; 2) It is an enormous time consuming process; 3) The evaluation result is influenced ... |
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| Nondestructive Testing using Magnetic Field Visualization Technique |
90 |
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| Authors:
M. Hashimoto; Y. Yamada; T. Takagi; K. Miya
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| This paper describes a new technique to detect cracks or flaws in conductor using a magnetic field visualization system. Cracks in a current- carrying conductor or in a ferromagnetic material cause perturbation in magnetic field distribution. Hence, visualization of magnetic field would enable us to identify the shape and size of cracks. The preliminary system developed here features as follows: (1) linear magnetic sensor, which uses 32 Hall devices in ... |
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| New Method for Position and Heading Compensation on Ground Vehicle. |
SEP 1985 |
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| Authors:
T. Tsumura; M. Hashimoto; N. Fujitwara
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| The accurate position and heading measuring system of a ground vehicle on roadway is an essential component of the automatic guidance system. As a measuring system with high freedom, the authors have investigated a self-contained measuring system based on the velocity information of both side wheels of a vehicle without any ground equipment. However, in the system, the accumulation of small errors of the velocity information leads to the wrong ... |
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| operational stress measurement and fatigue life assessment for hydraulic excavators |
11 SEP 83 |
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| Authors:
Y. Higashida; Y. Makino; M. Hashimoto
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| in order to establish a strength design method to prevent failures of the steel structures of hydraulic excavators, operational stresses were measured for various kinds of fields, various machine sizes and operational conditions by a telemetry system. based on the equivalent service stress range obtained from the results of analyses of operational stresses, the strength design method taking account of the durability, service life prediction method, and accelerated fatigue testing ... |
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| Embankment Tests in Reclamation Area, Manila Bay |
JUL 1979 |
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| Authors:
M. Tominaga; T. Sakaki; M. Hashimoto; C. C. Paulino; JOURNAL ARTICLE-UNIDENTIFIED SOURCE
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| Five-meter high embankment tests were conducted on the soft ground in the Manila Bay reclamation area. The ground had been improved by sand drain and other soil stabilization methods after preliminary soil investigations, and then settlement measurements and lateral displacement measurements had been made for 7 months. The measured results of settlement and lateral displacement were analyzed by the finite element method (FEM) using a visco elastic mathematical model, and ... |
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