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Flight Problems for Transport Aircraft in Wind Shear and Avoidance of Accidents

Release time:April 3, 2015 /

Speaker: Chuan-Tau Lan, Professor Emeritus / Formerly J. L. Constant Distinguished Professor, Aerospace Engineering, University of Kansas, U.S.

Date:Apr.7, 2015

Time: 10:00AM

Venue: B118, New Main Building

Abstract:

Wind shear is the type of wind field with varying magnitude and/or direction as encountered by an aircraft. Landing in horizontal wind shear has been a safety issue for all types of aircraft. The current aircraft design practice and certification account only for constant crosswind. As a result, accidents or incidents, such as hard or porpoise-style (i.e. jumping) landing, oscillation in roll, runway veer-off after touchdown, etc., have been occurring. Although pilot training has been again and again emphasized, unfortunately existing training simulators for landing operation in wind shear have serious shortcomings and may lead to negative training. The latter implies the possibility that when pilots apply what are learned in simulators, the situation may get worse as pointed out by NASA researchers. A key issue in the shortcomings is the aerodynamic database in tabulated form, which is not capable of accounting for these wind shear effects. To avoid the aforementioned accidents and incidents, an effective system consisting of fuzzy logic models will be shown to be effective in this talk. These fuzzy logic models are developed with Flight Data Recorder (FDR) data for several different aircraft and for several different types of flights. The latter involve hard landing, or roll oscillation, or runway veer-off in wind shear or strong crosswind. To illustrate the solutions, necessary pilot control inputs to avoid the above-mentioned landing problems will be determined through a new technique called the Fuzzy-logic Dynamic Inversion. Because the model data based on FDR data are formulated in the fuzzy logic format, instead of tabulated ones, important unsteady aerodynamic effects are automatically accounted for in the numerical simulation. Therefore, the shortcomings of existing training simulators can be overcome.

Introduction of the Speaker:

Chuan-Tau Lan, Professor Emeritus / Formerly J. L. Constant Distinguished Professor, Aerospace Engineering, University of Kansas, U.S.

Dr. Lan has been at the University of Kansas since 1968 teaching theoretical and applied aerodynamics, flight dynamics and applied mathematics. He received his B.S. in Civil Engineering degree at the National Taiwan University in 1958, MS degree in Civil Engineering at the University of Minnesota in 1963, and his Ph.D. is in Aeronautics from the New York University in 1968. Dr. Lan is an Associate Fellow of AIAA and a member of Sigma Gamma Tau and Tau Beta Pi. He received the AIAA Aerodynamics Award for 2000. He also received the Outstanding Aerospace Educator Award by the graduating class in 1991 and Excellence in Graduate Teaching in 2001, chosen by the department’s graduate students and sponsored by the KU Center for Teaching Excellence. He is the co-author of a textbook on airplane performance with Dr. Jan Roskam and is the author of a book entitled Applied Airfoil and Wing Theory.

(邀请单位:北航交通科学与工程学院/适航技术研究中心)