55 巻 (1989) 512 号 p. 967-972
The VSS design problem for a linear system has been investigated using a quadratic performance index, the value of which can be more lowered by logically switching admissible gains {K0, K1, ..., Kp} than by the single gain K0. The VSS control law is characterized a gain-switching surface for a quadratic function of the state and by including a design parameter α. Furthermore, the concept of the resultant model is introduced with a view to inspecting the VSS performance as a parameter of α. Practical application to a servo-system composed of a DC servomotor (50W) and gears is made with the result that the proposed VSS is more effective in the improvement of the index than the single gain K0 feedback system.