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Dymos 1.3.0

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@robfalck robfalck released this 19 Nov 13:13
· 296 commits to master since this release
1.3.0
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Release Notes for Dymos 1.3.0

November 19, 2021

This is version 1.3.0 of Dymos.

This release of Dymos introduces an ExplicitShooting transcription that provides an explicit Runge-Kutta integration of the ODE across a phase. This transcription is currently limited to fixed-step RK methods (RK4 being the default). Timeseries outputs are provided at the start/end of each segment in the phase. This is similar to the solve-segments capability in the collocation transcriptions, but fixed-step will provide an answer (albeit inaccurate) across the integration rather than failing to converge if the dynamics become highly nonlinear.

Enhancements

  • Added path constraints to the explicit shooting transcription. #659
  • Added control continuity enforcement to ExplicitShooting transcription, and refactored continuity components in general. #660
  • Added indication of fixed variables to linkage report. #662
  • Replaced the tensordot in the compute method of timeseries_output_comp with a regular dot product to remove a performance bottleneck. #665
  • Added constraint report to summarize boundary and path constraints for each phase of a trajectory. #666
  • Added ExplicitShooting to transcriptions #669
  • Significantly improved speed of ExplicitShooting #670
  • Added Radau, BDF and LSODA as options for scipy's integration method when using simulate #675

Bug Fixes

  • Removed solver for connected linkages. Its only needed for solve_segments. #668
  • Changed default value of units in Trajectory.add_parameter to _unspecified. #673
  • Added fix to allow parameters with static_targets=True to work with ExplicitShooting #679
  • Fixed formatting in the constraint report #680

Miscellaneous

  • None
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