Related to work in mixed-integer optimal control, we are interested in an efficient solution of optimal control problems of dynamic processes with many controls. Such problems arise, e.g., from the outer convexification of integer control decisions. We treat this optimal control problem class using the direct multiple shooting method to discretize the optimal control problem. The resulting nonlinear problems are solved using sequential quadratic programming methods. The classical condensing algorithm preprocesses the large but structured quadratic programs to obtain small but dense ones. It can be observed that this approach is not optimal when applied in conjunction with outer convexification.

We developed a new complementary condensing algorithm for quadratic programs with many controls. This algorithm is based on a hybrid null-space range-space approach to exploit the block structure of the quadratic programs that is due to direct multiple shooting. An assessment of the theoretical run time complexity reveals significant advantages of the proposed algorithm.

Author | Title | Year | Journal/Proceedings | Reftype | Link |
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Weber, T., Sager, S. & Gleixner, A. | Solving Quadratic Programs to High Precision using Scaled Iterative Refinement [BibTeX] |
2019 | Mathematical Programming Computation | article | DOI |

BibTeX:
@article{Weber2019, author = {Weber, T. and Sager, S. and Gleixner, A.}, title = {Solving Quadratic Programs to High Precision using Scaled Iterative Refinement}, journal = {Mathematical Programming Computation}, year = {2019}, volume = {11}, number = {3}, pages = {421--455}, doi = {http://dx.doi.org/10.1007/s12532-019-00154-6} } |
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Janka, D., Kirches, C., Sager, S. & Wächter, A. | An SR1/BFGS SQP algorithm for nonconvex nonlinear programs with block-diagonal Hessian matrix [BibTeX] |
2016 | Mathematical Progamming Computation | article | DOI |

BibTeX:
@article{Janka2016, author = {Janka, D. and Kirches, C. and Sager, S. and W\"achter, A.}, title = {An {SR1/BFGS SQP} algorithm for nonconvex nonlinear programs with block-diagonal {H}essian matrix}, journal = {Mathematical {P}rogamming {C}omputation}, year = {2016}, volume = {8}, number = {4}, pages = {435--459}, doi = {http://dx.doi.org/10.1007/s12532-016-0101-2} } |
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Frasch, J. V., Sager, S. & Diehl, M. | A parallel quadratic programming method for dynamic optimization problems [BibTeX] |
2015 | Mathematical Programming Computation | article | |

BibTeX:
@article{Frasch2015, author = {Frasch, J. V. and Sager, S. and Diehl, M.}, title = {A parallel quadratic programming method for dynamic optimization problems}, journal = {Mathematical {P}rogramming {C}omputation}, year = {2015}, volume = {7}, number = {3}, pages = {289--329} } |
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Frasch, J. | Parallel Algorithms for Optimization of Dynamic Systems in Real-Time [BibTeX] |
2014 | School: Otto-von-Guericke University Magdeburg |
phdthesis | url |

BibTeX:
@phdthesis{Frasch2014, author = {Frasch, J.}, title = {{P}arallel {A}lgorithms for {O}ptimization of {D}ynamic {S}ystems in {R}eal-{T}ime}, school = {Otto-von-Guericke University Magdeburg}, year = {2014}, url = {https://mathopt.de/PUBLICATIONS/Frasch2014.pdf} } |
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Frasch, J. V., Vukov, M., Ferreau, H. & Diehl, M. | A dual Newton strategy for the efficient solution of sparse quadratic programs arising in SQP-based nonlinear MPC [BibTeX] |
2013 | Optimization Online | article | url |

BibTeX:
@article{Frasch2013c, author = {Frasch, J. V. and Vukov, M. and Ferreau, H.J. and Diehl, M.}, title = {{A} dual {N}ewton strategy for the efficient solution of sparse quadratic programs arising in {SQP}-based nonlinear {MPC}}, journal = {{O}ptimization {O}nline}, year = {2013}, note = {Optimization Online 3972}, url = {http://www.optimization-online.org/DB_HTML/2013/07/3972.html} } |
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Kozma, A., Frasch, J. V. & Diehl, M. | A Distributed Method for Convex Quadratic Programming Problems Arising in Optimal Control of Distributed Systems [BibTeX] |
2013 | Proceedings of the 52nd Conference on Decision and Control (CDC) | inproceedings | |

BibTeX:
@inproceedings{Kozma2013a, author = {Kozma, A. and Frasch, J. V. and Diehl, M.}, title = {{A} {D}istributed {M}ethod for {C}onvex {Q}uadratic {P}rogramming {P}roblems {A}rising in {O}ptimal {C}ontrol of {D}istributed {S}ystems}, booktitle = {{P}roceedings of the 52nd {C}onference on {D}ecision and {C}ontrol ({CDC})}, year = {2013} } |
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Burgdörfer, H. | Strukturausnutzende Algorithmen der Quadratischen Programmierung für gemischt-ganzzahlige Optimalsteuerung [BibTeX] |
2011 | School: Universität Heidelberg |
mastersthesis | |

BibTeX:
@mastersthesis{Burgdoerfer2011, author = {Burgd\"orfer, H.}, title = {{S}trukturausnutzende {A}lgorithmen der {Q}uadratischen {P}rogrammierung f\"ur gemischt-ganzzahlige {O}ptimalsteuerung}, school = {Universit\"at Heidelberg}, year = {2011} } |
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Kirches, C., Bock, H., Schlöder, J. & Sager, S. | Block Structured Quadratic Programming for the Direct Multiple Shooting Method for Optimal Control [BibTeX] |
2011 | Optimization Methods and Software | article | DOI url |

BibTeX:
@article{Kirches2010b, author = {C. Kirches and H.G. Bock and J.P. Schl\"{o}der and S. Sager}, title = {{B}lock {S}tructured {Q}uadratic {P}rogramming for the {D}irect {M}ultiple {S}hooting {M}ethod for {O}ptimal {C}ontrol}, journal = {{O}ptimization {M}ethods and {S}oftware}, year = {2011}, volume = {26}, number = {2}, pages = {239--257}, url = {http://www.informaworld.com/smpp/content~db=all~content=a919763304~frm=titlelink}, doi = {http://dx.doi.org/10.1080/10556781003623891} } |

Further references of the MathOpt group can be found on this page.

Last Modification: 2016-05-12 - Contact Person: Sebastian Sager - Impressum