Abstract: A new robust design method is discussed in this paper. The main idea of this method is to use the addition of the pole differences and robustness measurement as a destination for optimization. It provides a quick and efficient optimizatoin method suitable for engineering.#br#Frobenius norm of the closed-loop matrix A+BK is used here as a robustness index. This index is minimized by Powell method, thus to make the lower bound of a robustness measurement maximized.

Key words: state feedback, robust control, Powell method