| Project/Area Number |
12555207
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Metal making engineering
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| Research Institution | Nagaoka University of Technology |
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Principal Investigator |
IHARA Ikuo Nagaoka University of Technology, Department of Mechanical Engineering, Associate professor, 工学部, 助教授 (80203280)
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| Co-Investigator(Kenkyū-buntansha) |
ITOH Goro Ibaragi University, Department of Mechanical Engineering, Associate professor, 工学部, 助教授 (80158758)
JEN Cheng-kuei National Research Council of Canada, Senior research officer
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| Project Period (FY) |
2000 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥6,400,000 (Direct Cost: ¥6,400,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2000: ¥5,600,000 (Direct Cost: ¥5,600,000)
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| Keywords | Ultrasound / Molten metal / On-line monitoring / Cleanliness / Inclusion / High temperature sensor / Numerical simulation / Focused ultrasound / 波動伝播シミュレーション |
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| Research Abstract |
A high performance ultrasonic sensor that provides a high spatial resolution measurement in high temperature environments has been developed in order to make an on-line monitoring of molten metal quality. Several experiments have been carried out using the developed focused sensors at 10 MHz in a pulse echo mode to investigate the performance of the developed monitoring system. Molten zinc, aluminum, and magnesium were used in the experiments. The main results obtained are the following:
(1) It has been shown that a numerical simulation technique with a finite difference method is a very useful tool for better designing high performance ultrasonic sensors with a clad buffer rod. Using such simulation, focused ultrasonic sensors having excellent wave guidance ability with high signal to noise ratio have been successfully developed.
(2) Laboratory validation of the use of focused ultrasonic sensors for inclusion particle detection in molten aluminum at 800 ℃ as well as molten zinc at 650 ℃ has been demonstrated. Back-scattered signals from particles in both molten metals are clearly visible at the focal region of the lens.
It is therefore considered that the developed ultrasonic technique is a promising candidate for on-line monitoring during molten metal processing.
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