A Comparison of Some Controller Designs for Mechanical Systems

In this short-paper practical aspects of the control of flexible mechanical systems are considered. For this purpose a flexible beam and an H^¿ robust controller presented in the literature are taken as the start point. The sensitivity to disturbance in the ressonance frequency range is the central point of the paper. In particular it is shown that small parameter variations may increase considerably the sensitivity when the H^¿ controller is employed. Finally a pragmatic approach is also suggested.