| 摘要 |
PROBLEM TO BE SOLVED: To efficiently find a defect in a stay vane 5 of a hydraulic turbine with high accuracy. SOLUTION: By mounting a distance meter 8 on an end part 19 of a three-dimensional digitizer 7 reading the three-dimensional position and direction of the end part 19, and by imitating operation of the end part to the stay vane 5, the three-dimensional shape of the stay vane is measured. Then, by mounting an ultrasonic probe 9 on the end part of the three-dimensional digitizer, and by sequentially letting the ultrasonic probe abut on the surface of the stay vane at respective positions, ultrasonic pulses is transmitted to the stay vane to receive their echoes. The three-dimensional position of the defect in the stay vane and the size of the defect are calculated based on respective abutting positions in the stay vane of the ultrasonic probe, received echo information, and the measured three-dimensional shape. The calculated three-dimensional defect is displayed in the form of a three-dimensional graphic. COPYRIGHT: (C)2008,JPO&INPIT
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