原文传递
Guidance Techniques for Near-Optimai
Laterai Escape Maneuvers in the
Presence of Windshear
Memorandum M-802
| 题名： | Guidance Techniques for Near-Optimai Laterai Escape Maneuvers in the Presence of Windshear Memorandum M-802 |
| 作者： | M. Selier |
| 关键词： | Windshear, microburst escape strategies, guidance, dynamic inversion, 6 degrees-of-freedom model. |
| 摘要： | This study treats three "missing" aspects of previous research on escape guidance strategies during microburst encounters. First, the performance of three longitudinal guidance laws in combination with one single lateral guidance law is evaluated when more then one microburst core is present. Altitude guidance proves to be the most robust and gives the most promising results, provided the reference altitude to which the aircraft is controlled, is selected properly. Therefore, in this study attempts are made to develop either a logic that adjusts the reference altitude during the escape, or a logic that predicts the "best" reference altitude at the initiation of the escape maneuver. Unfortunately, the results are not satisfactory. Third, the 3 degrees-of-freedom (DOF) model is extended to a full 6 DOF model in order to investigate the effects of inertia and windspeed variations over the aircraft’s size on performance and controllability. Inertia decreases performance of all strategies. The windspeed variations cause additional body moments, but even for rather severe microbursts these moments are not expected to cause controllability problems. Finally some recommendations for future research are presented. For example, turbulence should be modeled and implemented to study controllability effects. |
| 报告类型： | 科技报告 |
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