| 摘要 |
PURPOSE:To detect an abnormal part to be efficiently discovered, by graphically displaying aged deterioration of a signal from pressure sensors, provided in a line, and specifically locating the abnormal part from a crossing point between an advancing pressure wave and a reflecting pressure wave. CONSTITUTION:Pressure sensors P1-P5 are plurally provided with a space in a transport pipe 8 in the delivery side of an oil hydraulic pump, and aged deterioration of a signal from the sensor is graphically displayed. An advancing pressure wave toward the downstream from the upstream and a reflecting pressure wave toward the upstream from the downstream in a transport line are connected on a graphic display, and an abnormal part in the line is specifically located from the crossing point of these pressure waves. Accordingly, the abnormal part can be specifically located efficiently in a short time from the aged deterioration of the pressure by setting a less quantity of the pressure sensors.
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