doi: 10.3850/S201042862015001167

Adaptive Feed Forward Control for Gust Load and Limit Cycle Oscillation Alleviation

Y. Wang^1,a, F. Li¹ and A. Da Ronch^{2 1}China Academy of Aerospace Aerodynamics Beijing, 100074, China ^aywangcasc@yeah.net ²University of Southampton, Southampton, SO171BJ, U.K. A.Da-Ronch@soton.ac.uk

ABSTRACT

An adaptive feed forward controller is designed for gust loads alleviation and limit cycle oscillations suppression. Two sets of basis functions,based on the finite impulse response and modified finite impulse response approaches, are investigated to design the controller for gust loads alleviation. Limit cycle oscillations suppression is shown by using the modified finite impulse response controller. Worst case gust search is performed by using a nonlinear technique of model reduction to speed up the costs of calculations. Both the ``one-minus-cosine'' and Von Kármáncontinuous turbulence gusts of different intensities were generated to examine the performance of controllers. The responses of these two types of gust can be reduced effectively by finite impulse response controller in the whole process,while the modified finite impulse response controller is found to increase the loads during the initial transient response. The above two types of gust induced limit cycle oscillations were used to test the modified finite impulse response controller. Results show that it can suppress limit cycle oscillations to some extent.

Keywords: Aeroelasticity, Gust load, LCO, Suppression, Feedforward, Control.

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