Application of Eigenstructure Assignment Techniques in the Design of a Longitudinal Flight Control System

摘要

The use of eigenstructure assignment techniques has received wide attention as a tool for designing flight control systems for aircraft with multiple control surfaces. Development of a method for choosing the desired eigenstructure of the augmented, closed-loop system which would meet the handling qualities specifications was examined. This method consisted of forming an optimal plant matrix which possessed desirable dynamic characteristics and performing a spectral decomposition of this matrix. The resulting eigenstructure was used as the desired eigenvalues and eigenvectors during the full-state feedback, eigenstructure assignment process. The resulting feedback gain matrix was used in the control system. This process was performed on a model of the X-29A using the canard, flaperon, and strake flap control surfaces. The resulting augmented system was evaluated using the Neal-Smith pilot-model analysis and also using an X-29A main-in-the-loop simulation. The results show that the method is very promising, although care must be taken that all anticipated control system dynamics are considered when forming the optimal A matrix.