Flight Dynamic Analysis for Commercial Transport Aircraft Response to Severe Clear-Air Turbulence

商用民航機對強烈晴空亂流響應之飛行動力分析

臧瑞傳(Ray C. Chang) ； 譚嗣瀛(Szu-Ying Tan) ； 葉存恩(Cun-En Ye)

《中華科技大學學報》 46期 (2011/01) Pp. 151-168

https://doi.org/10.7095/JCUST.201101.0151

摘要

本論文之主要目的是分析一架受到強烈晴空亂流影響的雙發動機噴射民航機在穿音速飛行中發生突然的起伏運動之安定性與可操控性。在所有大氣擾動的類型中，晴空亂流相當難以偵測及預報，因而仍然是危害飛行安全的重要因素。為了有效分析飛機遭遇晴空亂流期間之性能衰退及安定性與可操控性變化，需要以飛行數據為基礎的非線性動態（亦即：隨時間變化的）氣動力模型。在本論文中採用一種基於模糊邏輯模型化(Fuzzy-Logic Modeling, FLM)技術的數值模型化法，使用由飛行數據紀錄器(flight data recorder, FDR)中取得的飛行數據建立一架雙發動機噴射民航機的非穩態氣動力模型，安定性與控制導數可由這些氣動力模型計算出來。本研究之成果可提供降低危害的概念，並可增進對於商用民航機在強烈晴空亂流中的氣動力響應之瞭解。

關鍵字

晴空亂流 ； 模糊邏輯模型化 ； 飛行數據紀錄器 ； 起伏運動

並列摘要

The main objective of this paper is to analyze the stability and controllability of a twin-jet transport in severe clear-air turbulence with sudden plunging motion in transonic flight. The clear-air 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 clear-air turbulence, the nonlinear, dynamic (i.e. time-dependent) aerodynamic models based on flight data are needed. In this paper, a numerical modeling method based on a Fuzzy-Logic Modeling (FLM) technique is used to estimate the unsteady aerodynamic models for a twin-jet transport by using the flight data from the flight data recorder (FDR). The stability and control derivatives to be presented can 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 clear-air turbulence.

並列關鍵字

clear-air turbulence ； Fuzzy-Logic Modeling FLM ； flight data recorder FDR ； plunging motion