APPROXIMATE AIRFRAME TRANSGER FUNCTIONS AND APPLICATION TO SINGLE SENSOR CONTROL SYSTEMS

摘要

Approximations to longitudinal and lateral rigid-body, level-flight airframe transfer function factors are derived and presented in tabular form. These deri¬vations are largely based on the use of a servo analysis method which can be made exact. The approximate factors are shown to correspond to exact factors for cer¬tain simplified sets of the airframe equations of motion; and the physical impli¬cations of this correspondence are explored. The approximate transfer function poles and zeros are related to fundamental stability and control quantities; and relative magnitudes for the poles and zeros of interesting transfer functions are established by an analysis of probable values for these quantities. The influence of airframe configuration changes on pole-2ero arrangements is shown, and the effect of various arrangement possibilities on closed-loop operation is demonstrated using appropriate servo-analysis techniques. The results and methods used have direct application to the integrated design of airframe-flight control systems.