Modeling U-2 Flight Through Clear Air Turbulence.

摘要

A dynamic three degrees-of-freedom simulation of the U-2 aircraft was developed in support of future Clear Air Turbulence (CAT) forecasting. Aerodynamic coefficients and the autopilot specification were obtained from the Lockheed Martin Aeronautics Company. The simulation used longitudinal aircraft equaitons of motion to model the aircraft's flight through CAT. The dynamics were modified to include non-steady relatilve wind conditions. Atmospheric inputs were created using wave models and other numerical simulations of CAT conditions. The results were compared to traditional turbulence sensitivity predictors, which appeared to under-predict the actual aircraft loads for some CAT conditions.