PURPOSE: To enhance decision accuracy by spectrally analyzing a pump delivery pressure while comparing a level of low frequency component of the spectral delivery pressure with that when a pump is normal and deciding cavitation to be generated when the deviation of compared result exceeds the reference value.
CONSTITUTION: A pump delivery pressure, when a centrifugal pump 1 is driven by a turbine 2 while opening a delivery valve 3, is detected by a detector 4. Feeding this detection signal to an FFT analyzer 8 through an amplifier 7, spectral analysis is performed in the preset measuring frequency band. Next feeding the analytic result to a cavitation decision means 9, a cavitation decision part 11 calculates a difference between the spectral delivery pressure and that stored in a data memory part 10 in the time of normal operation, and when the difference exceeds a reference value, deciding cavitation to be generated, an instruction of actuating an alarm device 13 while decreasing a speed of the turbine 2 is generated.
KONDO KIYOSHI
TAKEDA KIYOTAKA
KAWAHARA YASUO
MIYAHARA KIYOSHI
MATSUOKA KIICHI
NAKAMURA NORIZO
FUKUDA SHUNICHI
NAKAZONO HISATOSHI
JAPAN SHIPBUILDING RES ASS
ISHIKAWAJIMA HARIMA HEAVY IND
MITSUBISHI HEAVY IND LTD
KAWASAKI HEAVY IND LTD
MITSUI SHIPBUILDING ENG
JPS4720701A | ||||
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JPS62218661A | 1987-09-26 | |||
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