Robustness margin maximization for inaccurate controller implementation

This paper presents a synthesis method of controllers of which robustness margin against controller perturbation is maximized, in order to achieve cost reduction of controller implementation by choosing simple realization and/or truncating wordlength of controller coefficients. The proposed method is based on LMIs with one design parameter, which makes the design procedure easier than the existing nonfragile controller design method. Moreover, a design example of active noise control system is shown to illustrate the validity of the proposed method.