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@INPROCEEDINGS{Seidler:841903,
      author       = {Seidler, Florian and Trabert, Julius and Dück, Marcel and
                      van Waasen, Stefan and Schiek, Michael and Abel, Dirk and
                      Castelan, E. B.},
      title        = {{C}ontrol of {N}onlinear {C}oupled {E}lectromagnetic
                      {A}ctuators for {A}ctive {D}rag {R}eduction in {T}urbulent
                      {F}low},
      reportid     = {FZJ-2018-00200},
      year         = {2016},
      abstract     = {The research group FOR1779 “active drag reduction via
                      wavy surface oscillations” develops robust methods for
                      reduction of turbulent friction drag by flow control. The
                      planned concentration on unsteady flow conditions requires a
                      control of the electromagnetic actuator system for
                      generation of transversal surface waves. The bars are
                      positioned in parallel and coupled with an aluminum surface
                      to generate a travelling wave perpendicular to the flow
                      field. The actuator system can be approximately modelled as
                      a system of coupled, damped, driven, one dimensional
                      oscillators with strong nonlinear coupling. The focused
                      parameter range guarantees only an elastic deformation of
                      the aluminum surface. Previous model-based investigations
                      show a successful control with an iterative learning
                      controller (ILC). The friction, the noise (measurement- and
                      system noise) and the delay time proved to be critical
                      parameters. These parameters are therefore determined by
                      measurements on the uncontrolled prototype. The
                      determination of the parameters enables the refinement of
                      the model and the optimization of the control. In addition
                      to the ILC also other control strategies (e.g. PID, IMP, RC)
                      have been investigated accordingly and compared in terms of
                      accuracy, robustness and energy efficiency.},
      month         = {Jun},
      date          = {2016-06-06},
      organization  = {Automation, Baden-Baden (Germany), 6
                       Jun 2016 - 8 Jun 2016},
      subtyp        = {After Call},
      cin          = {ZEA-2},
      cid          = {I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/841903},
}