Add ref scaling to gross_mass_resid constraint#1053
Merged
Kenneth-T-Moore merged 1 commit intoOpenMDAO:mainfrom Mar 31, 2026
Merged
Add ref scaling to gross_mass_resid constraint#1053Kenneth-T-Moore merged 1 commit intoOpenMDAO:mainfrom
Kenneth-T-Moore merged 1 commit intoOpenMDAO:mainfrom
Conversation
The gross_mass_resid constraint (design_mass - actual_mass >= 0) had no ref, leaving it unscaled. For multi-mission problems where fleet missions are much lighter than the design mission, the residual can be 10-20% of GROSS_MASS, creating poorly scaled constraints. Set ref = GROSS_MASS/4 so that typical residual values are O(0.2-0.6) in scaled space.
Kenneth-T-Moore
approved these changes
Mar 31, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
3 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
The gross_mass_resid constraint (design_mass - actual_mass >= 0) had no ref, leaving it unscaled. For multi-mission problems where fleet missions are much lighter than the design mission, the residual can be 10-20% of GROSS_MASS, creating poorly scaled constraints.
Set ref = GROSS_MASS/4 so that typical residual values are O(0.2-0.6) in scaled space.
Summary
Summary of PR.
Related Issues
Backwards incompatibilities
None
New Dependencies
None