Flight Dynamic Comparative Analysis For Transport Aircraft In Severe Atmospheric Turbulence

• Main Authors: Chien, Jongwen, 簡重文
• Other Authors: Tan, Szuying
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/01327742973743830329

碩士 === 中華科技大學 === 飛機系統工程研究所 === 100 === The effect of hazardous weather conditions usually relates to the dynamic aerodynamic effects that result from instantaneous changes of the flight attitude. The pilots are quite easy to improperly operate the aviation vehicles under hazardous weather conditions. This situation cannot be easily flight-tested and belongs to the so-called unusual flight condition. For the enhancement of pilots’ situational awareness, research of the responses of aircrafts to the hazardous weather conditions is necessary. The main objective of this paper is to analyze the stability and controllability of two twin-jet transports in severe atmospheric turbulence with sudden plunging motion in transonic flight. The severe atmospheric turbulence is particularly difficult to detect and predict among all atmospheric disturbances, and yet affect the flight safety the most. To effectively analyze the performance degradation and variations in stability and controllability of aircraft encountering severe atmospheric turbulence, the nonlinear, dynamic (i.e. time-dependent) aerodynamic models based on flight data would be needed. In this paper, a numerical modeling method based on a Fuzzy-Logic Modeling (FLM) technique will be presented to estimate the unsteady aerodynamic models for two twin-jet transports by using the flight data from the flight data recorder (FDR). The stability and control derivatives to be presented will be calculated from these aerodynamic models. The results are analyzed to provide the mitigation concepts and promote the understanding of aerodynamic responses of the commercial transport aircraft in severe atmospheric turbulence.