The Influence of Roll,Pitch,and Yaw Rate Perturbations on the Alpha-Beta Stability Envelope of the F-4D Aircraft.

摘要

A study was made of the influence of pitch, roll, and yaw rate perturbations on an alpha-beta stability envelope of the F-4D aircraft. The nonlinear equations of motion were integrated numerically and the motion analyzed for stability. The stability criteria were adapted from MIL-F-8785B(ASG), 'Military Specification - Flying Qualities of piloted Airplanes'. Equilibrium conditions were perturbed and the stability analyses revealed two characteristic motions. The stable motion was a yaw divergence with a minor roll oscillation. Whereas the unstable motion was a divergence in roll. The aircraft appears to enter a steep, rolling dive.