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Research on Design and Control Method of Flexible Wing Ribs with Chordwise Variable Camber.

Xin Tao1, Li Bin1

  • 1School of Aeronautic, Northwestern Polytechnical University, Xi'an 710072, China.

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Summary

This study introduces a novel rigid-flexible coupled wing rib for morphing aircraft, enhancing control precision and deformation accuracy. The innovative design and fuzzy-adjusted controller significantly improve wing bending performance.

Keywords:
chordwise variable camberflexible wing ribfuzzy sliding mode controlpneumatic musclesstructural optimization

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Area of Science:

  • Aerospace Engineering
  • Mechanical Engineering
  • Robotics

Background:

  • Morphing wings offer enhanced aerodynamic performance but face challenges in precise control and structural integrity.
  • Traditional control strategies struggle with non-optimal parameters and varying deformation requirements in morphing structures.

Purpose of the Study:

  • To develop and validate a novel rigid-flexible coupled wing rib structure for improved continuous chordwise bending.
  • To design an advanced control strategy for precise deformation control of morphing wings.

Main Methods:

  • Optimization of the rigid-flexible hybrid configuration using mean camber line parameterization and genetic algorithms.
  • Topology and shape-size optimization for the flexible segment, incorporating bionic curved beams and S-shaped substructures.
  • Development of a fuzzy-adjusted proportional-integral sliding mode controller (PI-SMC) with biomimetic pneumatic muscles as actuators.

Main Results:

  • The three-rib wing box achieved a 30° deflection with a 15° flexible rib deflection, maintaining stresses within the allowable limit for 7075Al-T6.
  • Deformation error was minimized to 7.6%, with a 15° downward bending control exhibiting a 6.06s adjustment time, 0.19° steady-state error, and 1.8% overshoot.
  • Validation of the rigid-flexible coupled structure and the fuzzy PI-SMC's effectiveness in precise morphing wing control.

Conclusions:

  • The proposed rigid-flexible coupled wing rib structure is feasible and enhances morphing wing performance.
  • The fuzzy-adjusted PI-SMC provides precise and efficient control for morphing aircraft applications.
  • This research offers a valuable technical reference for the development of advanced morphing aircraft.