Guidance Techniques for Near-Optimal Lateral Escape Maneuvers in the Presence of211 Windshear

摘要

This study treats three 'missing' aspects of previous research on escape guidance211u001estrategies during microburst encounters. First, the performance of three 211u001elongitudinal guidance laws in combination with one single lateral guidance law is 211u001eevaluated when more than one microburst core is present. Altitude guidance proves 211u001eto be the most robust and gives the most promising results, provided the 211u001ereference altitude to which the aircraft is controlled, is selected properly. 211u001eTherefore, is this study attempts are made to develop either a logic that adjusts 211u001ethe reference altitude during the escape maneuver. Unfortunately, the results are 211u001enot satisfactory. Third, the 3 degrees-of-freedom (DOF) model is extended to a 211u001efull 6 DOF model in order to investigate the effects of inertia and windspeed 211u001evariations over the aircraft's size on performance and controllability. Inertia 211u001edecreases performance of all strategies. The windspeed variations cause 211u001eadditional body moments, but even for rather severe microbursts these moments are 211u001enot expected to cause controllability problems. Finally some recommendations for 211u001efuture research are presented. For example, turbulence should be modeled and 211u001eimplemented to study controllability effects.