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@MASTERSTHESIS{Santel:230129,
      author       = {Santel, Christoph Georg},
      title        = {{N}umeric simulation of a glider winch launch},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-144849},
      year         = {2008},
      note         = {Druckausgabe: 2008. - Onlineausgabe: 2010. -
                      Zweitveröffentlicht auf dem Publikationsserver der RWTH
                      Aachen University},
      abstract     = {The simulation presented in this thesis illustrates some of
                      the basic mechanisms governing the winch launch as it is
                      practiced at many gliding sites worldwide. Whereas several
                      comprehensive cybernetic models have been coupled in this
                      simulation, areas still in need of improvement within each
                      model have been pointed out for future enhancements. Results
                      could be improved by including an aerodynamic ground effect
                      model and properly modeling the ground to carry the glider
                      and cable. Friction of the ground against the glider and
                      cable should also be modeled in the future. More detailed
                      aerodynamic data on the behavior of the glider in stalled
                      ight needs to be implemented to strengthen the
                      expressiveness of the performed safety analyses. It should
                      also be attempted to gain data of actual winch types and
                      depict a more modern driveline setup regarding a torque
                      converter and other similar equipment and regard the effects
                      of density altitude on engine performance. The numeric
                      diculties having limited the minimum cable segment length
                      need to be analyzed and solved to improve cable resolution.
                      In the future, the virtual winch operator and pilot behavior
                      need to be compared to actual human behavior. Enhancements
                      of the control laws might regard aspects of fuzzy logic or
                      adaptive control. Also, the enhancement of the simulation to
                      include humans in the loop is thought to be possible. While
                      the general operationability of winch launches has been
                      proven in practice for several decades, it is also supported
                      by the presented results. It has also been shown that the
                      current methods of winch launching have found an acceptable
                      compromise between performance and safety as no highly
                      critical situations have been found in the reference launch.
                      The existing regulations on tailwind operations are
                      supported by the presented data and gusts seem to have
                      little effect on the weak link force, considering the given
                      wing loading. The destabilizing effect of a quick opening of
                      the winch throttle on the glider's phugoid mode is shown, as
                      well as the possibility of optimizing the tow hook location.
                      Increases in release altitude are gained through changes in
                      the cable type, tow distance and the maximum winch force.
                      While studying the inuence of different physical forces on
                      the cable, by varying the cable models, aerodynamic cable
                      drag is identied as another major influence on release
                      altitude, and is analyzed further by varying the drag
                      coefficient. At last, the dynamics of an aggressively own
                      launch is looked at and the results are in unison with the
                      focus of current training curricula.},
      keywords     = {Segelflug (SWD) / Simulation (SWD)},
      cin          = {415410},
      ddc          = {600},
      cid          = {$I:(DE-82)415410_20140620$},
      typ          = {PUB:(DE-HGF)9},
      urn          = {urn:nbn:de:hbz:82-opus-32655},
      url          = {https://publications.rwth-aachen.de/record/230129},
}