Automatica, Vol.36, No.12, 1923-1925, 2000
A comment on "L-infinity optimal control of SISO continuous-time systems"
The paper "L-infinity optimal control of SISO continuous-time systems" by Wang and Sznaier (Wang & Sznaier (1997). Automatica, 33 (1), 85-90) studies the problem of designing a controller that optimally minimizes the peak absolute value of system output, due to a fixed input signal. With a newly defined function space A(infinity), it was claimed that the set of all L-infinity-bounded outputs could be parameterized and that the problem could be transformed to a minimal distance problem on L-infinity space. We believe, however, their formulation has essential flaws.