Dynamic simulation of an aircraft under the effect of vortex wake turbulence

The introduction of modern heavy jets poses an increasing hasard to light and moderate weight aircraft due to high-intensity vortex wake turbulence. A technique is developed to simulate the response of a trailing airoraft due to the induced rolling moments and lose of lift imposed by the vortices. In spite of the nonlinear and complex nature of the problem, the method was applied successfully using an EAI 8812 analog computer with no hybrid facilities. The simulated aircraft was free to roll and move vertically and laterally with respect to the generating aircraft. Results of such a simulation for the case of a C-130 behind another C-130 and behind a CSA are presented.