Closed-Loop Stability of a Winged-Payload Booster Subject to Variations of an Elastic Mode Shape

摘要

The analysis is concerned with the effect of the variations in first bending mode shape on the stability of a booster with a simple rate and attitude feedback control system. It is found that the system stability is still sensitive to small mode shape variations when elastic and short-period frequencies are close, but not to as great an extent as was the forward-loop system alone. The elastic mode and closed-loop short-period frequencies are relatively insensitive to the mode shape variations. However, the damping of the two modes is quite sensitive. (Author)