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Recursive identification for choke finger system in wind tunnel.

Ning Du1, Lin Zhang1, Xiuhong Long1

  • 1High Speed Aerodynamics Research Institute, China Aerodynamics Research and Development Center, Sichuan, China.

ISA Transactions
|August 25, 2020
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This study developed a recursive algorithm to identify the dynamic characteristics of a choke finger system in wind tunnels. The method accurately estimates system parameters and outputs for improved controller design.

Keywords:
Block-oriented modelChoke finger systemParameter estimationRecursive identificationWind tunnel

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Area of Science:

  • Aerospace Engineering
  • Control Systems Engineering
  • Mechanical Engineering

Background:

  • The choke finger system is critical for wind tunnel operations.
  • Accurate real-time dynamic characterization is essential for advanced controller design.

Purpose of the Study:

  • To recursively identify the choke finger system of a wind tunnel at the China Aerodynamics Research and Development Center.
  • To develop an on-line parameter estimation algorithm for the choke finger system.

Main Methods:

  • Block-oriented modeling of the choke finger system based on experimental data analysis.
  • Proposal and modification of a recursive algorithm for on-line parameter estimation.
  • Convergence analysis to enlarge the algorithm's convergence domain.

Main Results:

  • Reasonable parameter estimates were obtained from the wind tunnel tests.
  • Accurate system output estimates were achieved using the proposed identification method.
  • The modified algorithm demonstrated improved convergence properties.

Conclusions:

  • The developed recursive algorithm effectively identifies the choke finger system's dynamics.
  • The method provides accurate parameter and output estimates for wind tunnel control.
  • This research contributes to enhancing wind tunnel controller design through precise system identification.