DocumentCode :
3042142
Title :
Application of probabilistic index of ride quality in multi-object control law synthesis for large civil aircraft
Author :
Lu, Nie ; Jinwu, Xiang
Author_Institution :
Sch. of Aeronaut. Sci. & Eng., Beijing Univ. of Aeronaut. & Astronaut., Beijing, China
fYear :
2010
fDate :
8-10 June 2010
Firstpage :
472
Lastpage :
477
Abstract :
Since the flight dynamic response of large civil aircraft is sensitive to the atmosphere turbulence inspiration which would significantly influence the ride quality and trajectory stability, a multi-object flight control law is designed in the current work, which can be easily applied to engineering. To consider the influence of structural dynamics, the flight dynamics equation is derived from the Lagrange method with inertial coupling neglected by considerable small deformation assumption of structural flexibility effect for the aircraft with traditional configuration. In the procedure of control law synthesis, constraints in both time and frequency domain are set in multi-objective synthesis techniques that should consider gust load alleviation and flying qualities which are introduced as requirements from damping ratio and natural frequencies of the dynamic system. To realize ride quality improvement in the control law synthesis, the probabilistic index is applied to emphasize the probabilistic characteristics of atmospheric turbulence intensity. The feedback gain for optimum effect on comfort improvement is obtained by genetic algorithm. A numerical model of large flexible aircraft is performed with the design procedure above, which comes to a trade-off between different requirements of flexible aircraft flight control law. Simulation results show that the response of gust can be reduced effectively, and the flying qualities were improved.
Keywords :
aircraft control; control system synthesis; genetic algorithms; position control; probability; time-frequency analysis; vehicle dynamics; Lagrange method; atmosphere turbulence inspiration; atmospheric turbulence intensity; civil aircraft; damping ratio; feedback gain; flexible aircraft flight control law; flight dynamic response; flight dynamics equation; frequency domain; genetic algorithm; gust load alleviation; inertial coupling; multiobject control law synthesis; multiobject flight control law design; multiobjective synthesis technique; probabilistic index; ride quality improvement; structural dynamics; time domain; trajectory stability; Acceleration; Aerospace control; Aircraft; Atmospheric modeling; Indexes; Mathematical model; Probabilistic logic;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Systems and Control in Aeronautics and Astronautics (ISSCAA), 2010 3rd International Symposium on
Conference_Location :
Harbin
Print_ISBN :
978-1-4244-6043-4
Electronic_ISBN :
978-1-4244-7505-6
Type :
conf
DOI :
10.1109/ISSCAA.2010.5633089
Filename :
5633089
Link To Document :
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