Abstract
This paper considers a problem of designing a control system for displacement expanders of magnetic recording test stands. Dynamic characteristics of the actuator for the expander have been analyzed by finite element method, and the vibration modes are evaluated in connection with the controllability and observability of the control system. A treatment of the plant uncertainty and the closed-loop performance is discussed in terms of the integrated design of the structure and controller. It is shown that there exists a trade off between the nominal performance and the robust properties in the design.
