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Movement mechanisms for transport aircraft during severe clear-air turbulence encounter

Published online by Cambridge University Press:  15 December 2022

W. Jiang ,
R.C. Chang Open the ORCID record for R.C. Chang [Opens in a new window] ,
N. Yang  and
M. Ding
W. Jiang
Affiliation:
Flight College, Changzhou Institute of Technology, Changzhou, Jiangsu, 213032, China Jiangsu Nanfang Bearing Co, Ltd, Changzhou, Jiangsu, 213163, China
R.C. Chang*
Affiliation:
Flight College, Changzhou Institute of Technology, Changzhou, Jiangsu, 213032, China
N. Yang
Affiliation:
Flight College, Changzhou Institute of Technology, Changzhou, Jiangsu, 213032, China
M. Ding
Affiliation:
Flight College, Changzhou Institute of Technology, Changzhou, Jiangsu, 213032, China
*
*Corresponding author. Email: zangrc@czu.cn
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Abstract

The objective of this paper is to present the movement mechanisms of transport aircraft response to severe clear-air turbulence to obtain the loss of control prevention for pilot training in IATA – Loss of Control In-flight (LOC-I) program. The transport aircraft in transonic flight is subjected to severe clear-air turbulence, resulting in a sudden plunging motion with the abrupt change in flight attitude and gravitational acceleration. The comparative analyses of the flight environment and aircraft response to severe clear-air turbulence for two four-jet aircraft are studied. The one with a larger dropped-off altitude during the plunging motion will be chosen to construct the movement mechanism. The nonlinear unsteady aerodynamic model of the chosen transport is established through flight data mining and the fuzzy-logic modeling of artificial intelligence technique based on post-flight data. The crosswind before the turbulence encounter will easily induce a rolling motion and then the sudden plunging motion during the turbulence encounter. The influences of the varying vertical wind and crosswind on loss of control are presented. To formulate preventive actions, the situation awareness of varying crosswind encountering for the operational pilot will be studied further in the future. The present study is initiated to examine the possible mitigation concepts of accident prevention for the pilot training course of IATA – Loss of Control In-flight (LOC-I) program.

Keywords

Clear-air turbulenceFlight data recorder (FDR)Flight environmentFuzzy-logic modelingInertial coupling
Type
Research Article
Information
The Aeronautical Journal , Volume 127 , Issue 1310 , April 2023 , pp. 537 - 561
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of Royal Aeronautical Society

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