Title:
DISPLAYING METHOD FOR FORECAST OF FUNCTIONAL LOSS OF PLANT SYSTEM
Document Type and Number:
Japanese Patent JPS5890210
Kind Code:
A
Abstract:
PURPOSE:To realize the simple forecast for the change of each function of a plant system, by obtaining the affecting probability of a fault to each device at each time point and then estimating and displaying the loss probability of each device when a fault state is detected for each component device of a plant. CONSTITUTION:A detector 3 is provided for each component device of plural plants 1 to detect the working state of the device 2 and the state of a process to be treated. Then the detector 3 feeds the detecting signal 4 to a plant system functional loss forecasting device 5. The device 5 stores previously the signal obtained when each device 2 is normal, and this normal signal is compared with the signal 4. The device having the difference larger than the prescribed value between those two signals is decided faulty. Then the probability for the fact that a state fault affects and each device loses its function is estimated at each time point on the basis of an estimating method for fault affecting range. The device 5 uses this probability and calculates the probability for the loss of the system function at each time point by means of a fault tree analysis method. Then the signal 6 of the result of calculation is fed to a display control part 7. The part 7 displays the contents of display at a display part 12 on the basis of the indication given from an input part 8.
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Inventors:
SASAKI RIYOUICHI
FURUKAWA MASAZUMI
SHINTANI SADANORI
OKADA TAKEO
FURUKAWA MASAZUMI
SHINTANI SADANORI
OKADA TAKEO
Application Number:
JP18787981A
Publication Date:
May 28, 1983
Filing Date:
November 25, 1981
Export Citation:
Assignee:
HITACHI LTD
International Classes:
G01D1/00; G01D21/00; G05B23/02; G06F9/44; G06N5/04; (IPC1-7): G01D7/00; G01D21/00
Attorney, Agent or Firm:
Toshiyuki Usuda