Robust PID for a class of linear uncertain parameter systems.

In the paper a synthesis of a robust PID controller for a class of linear uncertain parameter systems is discussed. The control plant under consideration is described by a transfer function. Zeros and poles of this transfer function are non linear functions of uncertain parameters. The synthesis method of robust controller bases on proposed robustness functions for the plant and for the closed loop control system. The closed loop control system should be more robust on the plant parameters uncertainty, than the plant. An idea of robustness functions for both plant and control system bases on a geometric interpretation of poles. Results of simulations confirmed the correctness of robust controller construction. Additionally the controller robust in the sense of proposed robustness functions is also robust in the sense of a settling time. (Robust PID controller for a class of linear uncertain parameter systems).