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Record OSWEC published-step nonlinear motion gap #276

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cmccomb merged 1 commit into from
Oct 13, 2026
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Record OSWEC published-step nonlinear motion gap #276

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6 changes: 6 additions & 0 deletions PARITY.md
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Expand Up @@ -887,6 +887,12 @@ surge, `0.262` mm heave, `0.522` mm/s surge speed, and `0.240` mm/s heave
speed. The paired gates are `0.0002` rad, `0.00015` rad/s, `1` mm,
`0.4` mm, `0.8` mm/s, and `0.35` mm/s in that order. Reducing Python's
output step from 0.1 to 0.05 s changes pitch by at most `1.1e-6` rad.
In a local comparison against the untouched published 0.1 s source output,
the same independent Python run differs by `0.007301` rad pitch,
`0.005409` rad/s pitch speed, and 33.66 mm surge. MATLAB's own published-
to-0.0125 s changes are `0.007192` rad, `0.005308` rad/s, and 33.16 mm
on those channels. These nearly equal gaps implicate the source step path;
they are a diagnostic, not a published-step motion gate.
This establishes independent motion parity for this fixed-hinge regular-wave
case against a refined MATLAB path. The published coarse-step motion and
other nonlinear six-DOF layouts have separate numerical and feature limits.
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