Originally published on dsaocean.com
A ProteusDS Core update is available with a number of minor improvements and bug fixes. A notable change includes improved nonlinear axial rigidity interpolation when a user provides load elongation input data. Highly elastic mooring components, like those from Datawell, EOM Offshore, and Seaflex, now have much more smooth numerical response between load elongation input values. Previously, interpolation between load elongation data points was the best fit ranging between linear through 9th order polynomials with the least RMS error. But even the best polynomial fits can introduce ripples in the nonlinear axial rigidity curve, which in some circumstances does not always produce ideal or expected model performance.
A new interpolation method is used to make a fit through your provided load elongation data points. This new interpolation regime is guaranteed to increase gradually without any ripples through increasing load elongation points and produces much better and expected behaviour. Note there are no changes to the model behaviour when polynomial coefficients are supplied for nonlinear axial rigidity. Read the ProteusDS Core Change Log to see a summary of features and bug fixes below.