An adaptive control approach to the attitude control of a flexible rocket

An adaptive notch filter design that considers the body-bending vibration a ssociated with the attitude control of a two-stage sounding rocket is discu ssed in this paper. The algorithm adapts the parameters while keeping the p oles of the notch filter inside the unit circle on the z-plane, and it sati sfies the stability conditions of the filter at all times. Only a single pa rameter of the filter is adapted to simplify the algorithm to speed up the convergence rate. Applying this adaptive notch filter to the two-stage soun ding rocket results in stable response characteristics of the attitude cont rol system, which is unstable without adaptation. (C) 2000 Published by Els evier Science Ltd.