Title :
Comments on "On the structure of digital controllers with finite word length consideration"
Author :
Whidborne, James F. ; Wu, Jun ; Istepanian, Robert S H ; Chu, Jian
Author_Institution :
Div. of Eng., King´´s Coll., London, UK
Abstract :
In the above-mentioned paper by Li (ibid. vol.43 (1998)), a condition is presented as necessary and sufficient to give the optimal realization of state space controllers for minimal sensitivity of all closed-loop eigenvalues subject to finite word-length effects. The condition is shown here not to be sufficient. In addition, the condition for minimal sensitivity of a single closed-loop eigenvalue presented in the above-mentioned paper is not complete. The complete conditions are presented in this paper.
Keywords :
closed loop systems; digital control; eigenvalues and eigenfunctions; poles and zeros; sensitivity analysis; stability; state-space methods; closed-loop systems; digital control; eigenvalues; finite word length; optimal structure; pole sensitivity; stability; state space; sufficient condition; Constraint theory; Digital control; Eigenvalues and eigenfunctions; Equations; Industrial control; Laboratories; Optimal control; Process control; Stability; Sufficient conditions;
Journal_Title :
Automatic Control, IEEE Transactions on
