Dear Yingyi,
The linearized mooring restoring (stiffness matrix) you calculated by the MAP++ wrapper in your post dated Feb 01, 2018 seems to match well with that reported in the OC4-DeepCwind specifications report in Eq. (5-15). If you estimate the slope of the force-displacement curves from the plots, the slope derived from the published plots is consistent with this stiffness matrix. I’m not sure why your force-displacement curve is showing less roll-roll and less yaw-yaw stiffness, but this seems inconsistent with the linearized stiffness matrix you’ve confirmed.
Best regards,