Investigation by Analog Computer of the Effects of Vertical Gusts on the Longitudinal Dynamics of Two Aircraft in a Carrier Landing Approach.

摘要

An analog computer investigation was conducted to determine the effect of vertical gusts on the longitudinal motion of two aircraft in a carrier landing approach. The aircraft investigated were the F-8A and F3D. Dynamic response to step disturbances of the elevator determined the general stability of the F-8A and short and long periods of aircraft oscillations. The effect of sinusoidal vertical gusts of various frequencies on the longitudinal motion of the F-8A was also investigated. Results of the investigation showed that sinusoidal gusts of period one second or shorter had a negligible effect on the motion of the F-8A, whereas sinusoidal gusts of longer period adversely affect the airplane's motion. Using a linearized input of carrier air wake for the F3D program, it was found that the effects of dynamic-pressure drop in the wake were additive and that these effects caused the aircraft flight path (with the stick fixed) to fall below the ideal flight path. (Author)