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

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 conduc...

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Bibliographic Details
Published inExperiments in fluids Vol. 57; no. 10; pp. 1 - 16
Main Authors Simon, Bernhard, Fabbiane, Nicolò, Nemitz, Timotheus, Bagheri, Shervin, Henningson, Dan S., Grundmann, Sven
Format Journal Article
LanguageEnglish
Published Berlin/Heidelberg Springer Berlin Heidelberg 01.10.2016
Springer Nature B.V
Subjects
Active control
Actuators
Algorithms
Black boxes
Boundary layers
Broadband
Control algorithms
Control stability
Control theory
Controller setting
Controllers
Disturbance waves
Disturbances
Engineering
Engineering Fluid Dynamics
Engineering Thermodynamics
Flight data
Flow stability
Fluid- and Aerodynamics
Gliders
Group speed
Heat and Mass Transfer
Laminar boundary layer
Laminar flow
Pressure side
Research Article
Stability
Stability analysis
Stability properties
Wave packets
Wing gloves
Flight Speed
Little Mean Square
Finite Impulse Response Filter
Direct Numerical Simulation
Laminar Boundary Layer
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ISSN0723-4864
1432-1114
1432-1114
DOI10.1007/s00348-016-2242-5

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Summary: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.
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ISSN:0723-4864
1432-1114
1432-1114
DOI:10.1007/s00348-016-2242-5