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Experiments in Fluids

, 57:160 | Cite as

In-flight active wave cancelation with delayed-x-LMS control algorithm in a laminar boundary layer

  • Bernhard SimonEmail author
  • Nicolò Fabbiane
  • Timotheus Nemitz
  • Shervin Bagheri
  • Dan S. Henningson
  • Sven Grundmann
Research Article

Abstract

This manuscript demonstrates the first successful application of the delayed-x-LMS (dxLMS) control algorithm for TS-wave cancelation. Active wave cancelation of two-dimensional broadband Tollmien–Schlichting (TS) disturbances is performed with a single DBD plasma actuator. The experiments are conducted in flight on the pressure side of a laminar flow wing glove, mounted on a manned glider. The stability properties of the controller are investigated in detail with experimental flight data, DNS and stability analysis of the boundary layer. Finally, a model-free approach for dxLMS operation is introduced to operate the controller as a ‘black-box’ system, which automatically adjusts the controller settings based on a group speed measurement of the disturbance wave packets. The modified dxLMS controller is operated without a model and is able to adapt to varying conditions that may occur during flight in atmosphere.

Keywords

Direct Numerical Simulation Little Mean Square Laminar Boundary Layer Flight Speed Finite Impulse Response Filter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by the German research foundation (DFG) under the Grant No.GR3524/4-1. Simulations have been performed at the National Supercomputer Centre (NSC) with computer time granted by the Swedish National Infrastructure for Computing (SNIC). We also wish to thank Jens Rohlfing from Fraunhofer LBF (Darmstadt) for the fruitful discussions. Finally we appreciate the support of our student and flight test pilot Tobias Hofmann.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Bernhard Simon
    • 1
    Email author
  • Nicolò Fabbiane
    • 2
  • Timotheus Nemitz
    • 1
  • Shervin Bagheri
    • 2
  • Dan S. Henningson
    • 2
  • Sven Grundmann
    • 3
  1. 1.Institute for Fluid Mechanics and AerodynamicsTechnische Universität DarmstadtGriesheimGermany
  2. 2.Linné FLOW Centre, KTH MechanicsStockholmSweden
  3. 3.Department of Fluid MechanicsUniversity of RostockRostockGermany

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