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@ARTICLE{Assassa:826312,
      author       = {Assassa, Fady and Marquardt, Wolfgang},
      title        = {{E}xploitation of the control switching structure in
                      multi-stage optimal control problems by adaptive shooting
                      methods},
      journal      = {Computers $\&$ chemical engineering},
      volume       = {73},
      issn         = {0098-1354},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-00545},
      pages        = {82 - 101},
      year         = {2015},
      abstract     = {The adaptive switching structure approach is generalized
                      from single-stage problems and single-shooting to
                      multi-stage problems and multiple-shooting. This
                      generalization is based on previous work on the exploitation
                      and detection of the control switching structure and
                      wavelet-based control grid refinement for single-stage
                      problems. Here, single-shooting is employed to transcribe
                      the multi-stage optimal control problem (OCP) into a
                      nonlinear programming problem. The proposed multi-stage
                      formulation is also capable to represent the transcription
                      of single-stage OCP stemming from multiple-shooting. Thus,
                      the previously reported adaptive multiple-shooting approach
                      is extended by an adaptation of the switching structure.
                      Finally, a new stopping criterion is introduced that
                      measures the intermediate constraint violation at the
                      optimal solution.The proposed adaptive switching structure
                      detection is illustrated for a multi-stage and a
                      multiple-shooting problem using the Williams–Otto
                      semi-batch reactor. A solution of user-specified accuracy in
                      the objective and the path-constraints can be obtained using
                      only few decision variables.},
      cin          = {VS-V / GRS ; GRS Aachen},
      ddc          = {660},
      cid          = {I:(DE-Juel1)VS-V-20090406 / I:(DE-588b)1026307295},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000349755100009},
      doi          = {10.1016/j.compchemeng.2014.11.009},
      url          = {https://juser.fz-juelich.de/record/826312},
}