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@INPROCEEDINGS{Volkel:842385,
      author       = {Volkel, S. and Heil, R. and Schiek, M. and Schlosser, M.
                      and Silex, W. and van Waasen, S.},
      title        = {{S}mooth wavelength transition in a {L}orentz force based
                      actuator system for turbulence research},
      reportid     = {FZJ-2018-00626},
      year         = {2017},
      abstract     = {The development of robust methods to significantly reduce
                      frictional resistance of the turbulent boundary layer
                      involves wind tunnel experiments with transversal waves on
                      an extended aluminum surface. For this purpose an actuation
                      system to generate the transversal waves by phase-shifted,
                      uniformly distributed electromagnetic actuators has been
                      developed. Each of these actuators are mechanically coupled
                      with the aluminum surface and driven by an FPGA. They adapt
                      to the change of wave parameters with automatically
                      calculated smooth signal transitions. One of these signal
                      transitions is the developed method of smooth wavelength
                      transition based on a direct digital synthesis (DDS). This
                      method ensures a transition by means of an intelligent
                      adaptation of the readout steps of a waveform look-up table
                      and thus eases the application of special control algorithms
                      ensuring the precision of the waveform.},
      month         = {Oct},
      date          = {2017-10-29},
      organization  = {2017 IEEE SENSORS, Glasgow (United
                       Kingdom), 29 Oct 2017 - 1 Nov 2017},
      subtyp        = {After Call},
      cin          = {ZEA-2},
      cid          = {I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / FOR 1779 - Aktive Widerstandsreduktion durch
                      wellenförmige Oberflächenoszillation (202175528)},
      pid          = {G:(DE-HGF)POF3-113 / G:(GEPRIS)202175528},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/842385},
}