Section 1.1 A Brief History of Control Theory Robust Control Theory Model uncertainty is fully considered in robust control theory. Robustness:Insensitive to the model uncertainty. Tools:Combined frequency domain and state space method Important results: Youla parameterization (Youla et al.,1976) (Important idea in modern design methods) Hoo control (Zames,1981) State space solution to the Hoo control(Doyle et al.,1989) Problems that need to be clarified for deeper and more comprehensive studies.For example: How does the design relate to the frequency response? How to reduce the complexity of the design and the result? 4口，+@4定4生定QC Zhang.W.D..CRC Press.2011 Version 1.0 8/31Section 1.1 A Brief History of Control Theory Robust Control Theory Model uncertainty is fully considered in robust control theory. Robustness: Insensitive to the model uncertainty. Tools: Combined frequency domain and state space method Important results: Youla parameterization (Youla et al., 1976) (Important idea in modern design methods) H∞ control (Zames, 1981) State space solution to the H∞ control (Doyle et al., 1989) Problems that need to be clarified for deeper and more comprehensive studies. For example: 1 How does the design relate to the frequency response? 2 How to reduce the complexity of the design and the result? Zhang, W.D., CRC Press, 2011 Version 1.0 8/31