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Coaxial helicopter model identification based on differential evolution algorithm and accuracy analysis
Liu Peng, Meng Zhijun, Wu Zhe*
School of Aeronautic Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� The coaxial helicopter exists intense aerodynamic interaction between the upper and lower rotor, and it is difficult to establish the accurate dynamic model for flight control systems using the theory analysis and wind tunnel experiment. Frequency sweep flight experiment data was used to extract the non-parametric frequency responses that fully characterizes the coupled helicopter dynamics. A nonlinear search based on differential evolution algorithm for a linear state-space model which matches the frequency-response data set was conducted. Parameter insensitivity and Cramer-Rao bound analysis results have low values, indicating very good reliability of the identified model. The accuracy of the identified model is verified by comparing the model-predicted responses with the responses collected during flight experiments, and the model can be used for flight quality analysis and flight control system design.
Keywords�� differential evolution algorithm   coaxial helicopter   flight dynamic model   frequency identification   accuracy analysis     
Received 2011-04-22;
����, ��־��, ����.����DE�㷨�Ĺ���ֱ����ģ�ͱ�ʶ�����ȷ���[J]  �������պ����ѧѧ��, 2012,V(7): 971-975
Liu Peng, Meng Zhijun, Wu Zhe.Coaxial helicopter model identification based on differential evolution algorithm and accuracy analysis[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2012,V(7): 971-975
http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2012/V/I7/971
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