| 摘要 |
PROBLEM TO BE SOLVED: To provide a monitoring device for the drive part of a pneumatically operated valve, which can easily and accurately presume the nonlinear characteristics of the drive part. SOLUTION: This monitoring device is composed of a valve opening speed calculator 12 to calculate the valve opening/speed time series data 11 from the time series data 10 for the degree of valve opening, a presumed time series data selector 14 to output the time series data separated into the opening direction and closing direction from the time series data 10 for the degree of valve opening, the time series data of the valve pressure 13, and time series data of the valve opening/speed 12, an opening direction three-dimensional parameter approximator 17 to approximate the three- dimensional parameter 19 in the opening direction from opening direction time series data 15, a closing direction three-dimensional parameter approximator 18 to approximate the three-dimensional parameter 20 in the closing direction from closing direction time series data 16, and a nonlinear parameter calculator 21 to calculate the nonlinear characteristics (Coulomb's frictional force 22, viscosity coefficient 23, and synthetic spring constant 24) of the drive part from the three-dimensional parameters (19 and 20). |
