LAC HAC SYSTEM WITH A VARIABLE FEEDBACK GAIN FOR FLEXIBLE SPACE STRUCTURES

This paper proposes a new control technique, based on the low authorit y control/high authority control (LAC/HAC) concept, to suppress the vi bration of flexible space structures. The control system designed by t he new control technique has a mechanism to adjust the HAC feedback ga in between zero and one in such a manner as to enhance the effectivene ss of control and to obtain global stability even when the magnitude o f the LAC gain is not suitable. The paper first describes the theoreti cal mechanism of the new control technique and proposes a numerical me thod for determining the HAC feedback gain based on a neural network s ystem. Then it shows the characteristic features of the new technique by computer simulation examples. The computer simulation shows that th e new technique is quite effective in suppressing the spillover effect s, and quite feasible for implementation.