ABNORMALITY DETECTING METHOD, STABILITY CALCULATING METHOD, AND OPERATION CONTROL METHOD FOR MACHINE FACILITY AND ROLLER MILL

摘要

PURPOSE: To securely detect an abnormal state even when an operation state stays low or high by detecting abnormality of the operation state of machine facilities by making a comparison with an abnormal reference value which is a specific value different from the long-term mean value of operation state data. ;CONSTITUTION: A vibration pickup 2 detects vibration at intervals of one second and data on it are inputted to a data processor 1. The data processor 1 fetches S1 the vibration data and calculates S2 a short-term means value (a) in an analytic time of 60 seconds back from the current time to the past. Further, the long-time mean value μ and standard deviation σ in a reference period of 20 minutes back from the current time to the past are calculate S3. Then the short-term mean value (a), long- term mean value μ, and standard deviation σ are compared by an expression I to detect abnormality of the operation state of the roller mill. In expression 1, a≥u+χσ, χis an alarm set value which is previously set according to the kind of the roller mill and the kind of detected operation state data. The calculated value of the right side of this expression I is an abnormality reference value.;COPYRIGHT: (C)1995,JPO