Journal of Astronautics ›› 2020, Vol. 41 ›› Issue (4): 379-388.doi: 10.3873/j.issn.1000-1328.2020.04.001

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A Time Varying Structure Modal Parameter Estimation Method in Deterministic Evolution for Launch Vehicle#br#

YU Lei, LIU Li, CUI Ying, YUE Zhen jiang, KANG Jie   

  1. 1. School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China;
    2. Key Laboratory of Dynamics and Control of Flight Vehicle, Beijing Institute of Technology, Beijing 100081, China
  • Received:2019-03-21 Revised:2019-07-30 Online:2020-04-15 Published:2020-04-25

Abstract: Focusing on the problems of time-varying structure modal parameter estimation for a launch vehicle, a novel time-varying structure modal parameter estimation method in deterministic evolution based on the time-varying auto- regressive moving average (TARMA) model is proposed. The method takes the advantage of a wavelet function in detail representation and uses it as the basis function of time-varying parameters in the TARMA model, and the wavelet basis based FS-TARMA model is finally established. In order to estimate the time-varying parameters in a linear manner, the two-step least square estimation method is proposed. The proposed method is verified by the core stage of Ariane V time-varying finite element model with its counterpart Fourier basis FS-TARMA method, and the comparative identification results demonstrate that the superior achievable accuracy and enhanced tracking capabilities of the Mexican wavelet basis FS-TARMA method.

Key words: Launch vehicle, Time-varying structure, Dynamic modeling, Modal parameter estimation, Wavelet function

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