Control system design support device, control system design support method, and control system design support program

摘要

To provide a control system design support device, a control system design support method, and a control system design support program which can calculate a gain constant for constructing a control system with higher stability.SOLUTION: The control system design support device 1 includes a separation unit 3 which separates an open-loop transfer function of a control system into a linear function having a predetermined gain constant and a nonlinear function including a description function of a nonlinear element, an angle calculation unit 4 which calculates an angle between a base and a hypotenuse of a right triangle, when a line segment connecting an origin and an output point when an amplitude value of an input signal to the nonlinear element is input to the nonlinear function is a base of a right triangle, and a line segment having a value of an amplitude of a harmonics of the predetermined order in the output when the input signal is applied to the nonlinear element is an opposite side of the right triangle, a threshold setting unit 5 which sets a phase threshold, and a gain calculation unit 6 which calculates a maximum gain constant at which a minimum phase value in a frequency response of the linear function is equal to or greater than a phase threshold.SELECTED DRAWING: Figure 4