Volume 36 Issue 10
Oct.  2021
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LEI Hao, CHEN Boyi, LIU Yanbin, LU Yuping. Longitudinal attitude control for very flexible aircraft with thrust cooperation[J]. Journal of Aerospace Power, 2021, 36(10): 2207-2217. doi: 10.13224/j.cnki.jasp.20200457
Citation: LEI Hao, CHEN Boyi, LIU Yanbin, LU Yuping. Longitudinal attitude control for very flexible aircraft with thrust cooperation[J]. Journal of Aerospace Power, 2021, 36(10): 2207-2217. doi: 10.13224/j.cnki.jasp.20200457

Longitudinal attitude control for very flexible aircraft with thrust cooperation

doi: 10.13224/j.cnki.jasp.20200457
  • Received Date: 2020-10-29
  • Publish Date: 2021-10-28
  • The improved multi-body model of very flexible aircraft was proposed to analyse the flight/structure coupled dynamics characteristics of very flexible aircraft,the longitudinal dynamics characteristics of very flexible aircraft were studied and the longitudinal attitude controller was designed.The dynamics of dihedral angle was used to approximate the structural dynamics characteristics of very flexible aircraft,and the coupled longitudinal dynamics model was derived.The improved model was trimmed under different load conditions,and the relationship between the stability and deformation of the system was analyzed according to the linearized model at the equilibrium point.The longitudinal attitude controller was designed for attitude stabilization and tracking of very flexible aircraft.Compared with conventional aircrafts,large deformation occurs during the flight of very flexible aircraft.When the load was large,the trimmed configuration was approximately “U” shaped,and the longitudinal phugoid period was unstable.The results showed that as the deformation increased,the coupling between the modes increased.The longitudinal attitude control of very flexible aircraft needed to control the velocity at the same time and takes the coupled structure dynamics into account,otherwise,due to the coupling effect between structure and flight dynamics,the system will even be divergent.

     

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