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Journal Articles

Investigation of an on-line pipe wall defect monitoring sensor

Tagawa, Akihiro; Fujiki, Kazunari; Kojima, Fumio*

International Journal of Applied Electromagnetics and Mechanics, 33(1-2), p.639 - 647, 2010/12

This paper presents development of a defect monitoring sensor using electromagnetic acoustic transducer (EMAT). The present study investigates the possibility of the defect monitoring using a new EMAT structure. The current EMAT was unsuitable for monitoring because of the large sensor area, and also it was necessary to have a mechanical scanning. Therefore, it was developed a new EMAT, smaller in size which does not need a mechanical scanning. The new EMAT was manufactured for a trial purpose. Based on the result of the performance test, it was found out that the new EMAT is able to monitor a defect and also to monitor both a thin and thick piping wall.

Journal Articles

Study on pipe health monitoring method by hybrid measurement using electromagnetic ultrasonic

Tagawa, Akihiro; Kojima, Fumio*

Hozengaku, 9(1), p.45 - 50, 2010/04

The purpose of this study is to develop a hybrid sensor to be able to measure two or more physical values (the pipe surface temperature, the pipe wall thinning and the temperature of an internal fluid) with one sensor with an electromagnetic acoustic transducer. Each result of a measurement can improve the measurement precision by doing working that calibrate each other. The piping surface temperature was measured by converting the direct current resistance at the temperature by using the EMAT coil. As a result, it was confirmed that coefficients of determination reproduced by the accuracy of 0.99 or more and it was in the proportion the temperature and resistance. It was confirmed the amount of the pipe wall thinning is to be able to measure the board thickness of the piping of 10 mm at 200 $$^{circ}$$C by using the pulse echo method and the pulse echo resonance method. Water temperature was calculated by using the distance between EMATs which carried out opposite arrangement and ultrasonic time of concentration.

Journal Articles

Study on pipe health monitoring method by hybrid measurement using electromagnetic ultrasonic

Tagawa, Akihiro; Kojima, Fumio*

Hozengaku, 9(1), p.45 - 50, 2010/04

The purpose of this study is to develop a hybrid sensor to be able to measure two or more physical values with one sensor with an electromagnetic acoustic transducer. Each result of a measurement can improve the measurement precision by doing working that calibrate each other. The piping surface temperature was measured by converting the direct current resistance at the temperature by using the EMAT coil. As a result, it was confirmed that coefficients of determination reproduced by the accuracy of 0.99 or more and it was in the proportion the temperature and resistance. It was confirmed the amount of the pipe wall thinning is to be able to measure the board thickness of the piping of 10 mm at 200 $$^{circ}$$C by using the pulse echo method and the pulse echo resonance method. Water temperature was calculated by using the distance between EMATs which carried out opposite arrangement and ultrasonic time of concentration.

Journal Articles

Investigation of an on-line pipe wall defect monitoring sensor

Tagawa, Akihiro; Fujiki, Kazunari; Kojima, Fumio*

Proceedings of 14th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2009), p.207 - 208, 2009/09

In the paper it was also investigated the defect detection using the electromagnetic acoustic transducer (EMAT). However, EMAT needs a different processing of defect detection signal. Until now, it was studied a small one EMAT unit that has a non-couplant characteristic and uses additionally mechanical scanning to detect defects. In the present paper it is investigated one EMAT unit with two separate coils for transducer and receiver, that can monitor for defects without any mechanical scanning.

Oral presentation

Natural frequency transition of a base-isolated building during the 2011 off the Pacific coast of Tohoku earthquake

Kirita, Fumio; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kojima, Keidai

no journal, , 

no abstracts in English

Oral presentation

A Study on the response characteristics of base-isolated structures for earthquake motion, 2

Nakanishi, Ryuji; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Kirita, Fumio; Kojima, Keidai

no journal, , 

no abstracts in English

Oral presentation

A Study on the response characteristics of base-isolated structures for earthquake motion, 1

Hashimura, Hirohiko; Uryu, Mitsuru; Yamazaki, Toshihiko; Nakanishi, Ryuji; Kirita, Fumio; Kojima, Keidai

no journal, , 

no abstracts in English

Oral presentation

Long-term evaluation of natural frequency of a base-isolated building before and after the 2011 off the Pacific coast of Tohoku earthquake

Kirita, Fumio; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kojima, Keidai

no journal, , 

no abstracts in English

Oral presentation

Performance evaluation of lead dampers on base-isolated building attacked by the 2011 off the Pacific coast of Tohoku earthquake, 1

Hashimura, Hirohiko; Uryu, Mitsuru; Yamazaki, Toshihiko; Nakanishi, Ryuji; Kirita, Fumio; Kojima, Keidai

no journal, , 

no abstracts in English

Oral presentation

Performance evaluation of lead dampers on base-isolated building attacked by the 2011 off the Pacific coast of Tohoku earthquake, 2

Kirita, Fumio; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kojima, Keidai

no journal, , 

no abstracts in English

Oral presentation

Performance evaluation of lead dampers on base-isolated building attacked by the 2011 off the Pacific coast of Tohoku earthquake, 3

Kojima, Keidai; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kirita, Fumio

no journal, , 

no abstracts in English

Oral presentation

Performance evaluation of lead dampers on base-isolated building attacked by the 2011 off the Pacific coast of Tohoku earthquake, 4

Nakanishi, Ryuji; Uryu, Mitsuru; Yamazaki, Toshihiko; Hashimura, Hirohiko; Kirita, Fumio; Kojima, Keidai

no journal, , 

no abstracts in English

Oral presentation

Performance evaluation of lead dampers on base-isolated building attacked by the 2011 off the Pacific coast of Tohoku earthquake, 5

Uryu, Mitsuru; Kirita, Fumio; Yamazaki, Toshihiko; Hashimura, Hirohiko; Nakanishi, Ryuji; Kojima, Keidai

no journal, , 

no abstracts in English

13 (Records 1-13 displayed on this page)
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