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Investigation of longitudinal aerodynamic parameters identifcation method for fly-by-wire passenger airliners

Chinese Journal of Aeronautics 2013年第5期26卷 1156-1163页

作者： Wu Zhao Wang Lixin Xu Zijian Tan Xiangsheng School of Aeronautic Science and Engineering Beihang University Flight Test Center Commercial Aircraft Corporation of China

The flight control system of a fly-by-wire （FBW） passenger airliner with a complex frame-work and high feedback gain augmentation would change the original characteristic of a loaded signal and suppress the excitation of an airplane＇s pertinent motion modes. Taking a research example of an FBW passenger airliner model with longitudinal relaxed-static-stability, a new method of signal type selection and signal parameter design is proposed, through analysis of signal energy distribution and plane body＇s frequency response. According to CCAR60--the Appraisal and Use Regulation of Flight Simulator Device, the simulation validation of the FBW passenger airliner＇s longitudinal aerodynamic parameters identification is put forward. The validation result indicates that the designed signal could excite the longitudinal motion mode of the FBW passenger airliner adequately and the multiparameter comparison in simulation meets the objective test request of CCAR60. Meanwhile, the relative errors of aerodynamic parameters are less than 10%.

关键词： CCAR60 Excitation signal design Fly-by-wire passenger air-liner high feedback gain augmentation Identification Longitudinal aerodynamic parameter Simulation validation

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Investigation of lateral-directional aerodynamic parameters identification method for fly-by-wire passenger airliners

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Chinese Journal of Aeronautics 2014年第4期27卷 781-790页

作者： Wu Zhao Wang Lixin Lin Jiaming Ai Junqiang School of Aeronautic Science and Engineering Beihang University

A new identification method is proposed to solve the problem of the influence on the loaded excitation signals brought by high feedback gain augmentation in lateral-directional aerodynamic parameters identification of fly-by-wire（FBW） passenger airliners. Taking for example an FBW passenger airliner model with directional relaxed-static-stability, through analysis of its signal energy distribution and airframe frequency response, a new method is proposed for signal type selection, signal parameters design, and the appropriate frequency relationship between the aileron and rudder excitation signals. A simulation validation is presented of the FBW passenger airliner＇s lateral-directional aerodynamic parameters identification. The validation result demonstrates that the designed signal can excite the lateral-directional motion mode of the FBW passenger airliner adequately and persistently. Meanwhile, the relative errors of aerodynamic parameters are less than 5%.

关键词： Excitation signal design Flight test Fly-by-wire (FBW)passenger airliner high feedback gain augmentation Identification Lateral-directional aerodynamic parameter

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