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A robust force feed-forward observer for an electro-hydraulic control loading system in flight simulators.

Jinsong Zhao1, Gang Shen2, Chifu Yang3

  • 1Hebei Provincial Key Laboratory of Heavy Machinery Fluid Power Transmission and Control, Yanshan University, Qinhuangdao, 066004, China; Key Laboratory of Advanced Forging & Stamping Technology and Science (Yanshan University), Ministry of Education of China, Qinhuangdao, 066004, China.

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|December 29, 2018
PubMed
Summary
This summary is machine-generated.

A new robust feed-forward observer enhances electro-hydraulic control loading systems for flight simulators. This controller effectively reduces pilot-induced disturbance forces, improving control performance and impedance characteristics for a more realistic feel.

Keywords:
Disturbance forceElectro-hydraulic control loading systemFlight simulatorForce feelRobust feed-forward observerSystem identification

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Area of Science:

  • Control Systems Engineering
  • Robotics and Automation
  • Aerospace Engineering

Background:

  • Electro-hydraulic control loading systems are crucial for realistic flight simulation.
  • Existing systems face challenges with disturbance forces from pilot control displacement.
  • Improving control performance and fidelity requires advanced control strategies.

Purpose of the Study:

  • To propose a robust feed-forward observer for electro-hydraulic control loading systems.
  • To reduce disturbance forces and enhance control performance in flight simulators.
  • To achieve impedance characteristics closer to an ideal force feel model.

Main Methods:

  • Dynamic modeling of the electro-hydraulic system as a double-loop force-displacement impedance system.
  • Design of an approximated inverse model for the non-minimum-phase force closed-loop.
  • Optimization of a feed-forward observer filter using an H∞ controller and nominal model modification.
  • Algorithm development using a bisection method for robust performance enhancement.

Main Results:

  • The proposed controller effectively reduces disturbance forces in the electro-hydraulic control loading system.
  • Experimental results demonstrate superior control performance compared to PID, velocity feed-forward, and H∞ controllers.
  • The system's impedance characteristics closely match the ideal force feel model.

Conclusions:

  • The robust feed-forward observer provides significant improvements in feel force control for flight simulators.
  • The developed control strategy enhances realism and pilot immersion in flight simulation.
  • The method offers a viable solution for advanced control loading system design.