| Budget Amount *help |
¥14,690,000 (Direct Cost: ¥11,300,000、Indirect Cost: ¥3,390,000)
Fiscal Year 2013: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2012: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2011: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
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| Research Abstract |
We have developed an ultrasonic wave propagation simulation program based on superposition method of point sound sources. The calculation results were compared with FE and experimental results, and its accuracy were confirmed.
Using the developed method, the simulation of ultra sonic propagation can be performed with 1/1000 conputating time of FE calculation.
Defects detection under the presence of the coating film of the steel material is required for the ship in service. The echo height from a defect varies nonlinearly with coating thickness. It was clarified that it is due to the mode conversion of ultrasonic waves at the boundary between coating and steel and the multiple reflection of the ultrasonic wave in the coating film.
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