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Why does the Z component of wave-frequency net vessel moment (DYNOUT and SNAPOUT) about the turret not vanish in SPMsim?

April 26, 2017component moment NET turret Vanish vessel

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Why does the Z component of wave-frequency net vessel moment (DYNOUT and SNAPOUT) about the turret not vanish in SPMsim?

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For wave-frequency calculations the turret is assumed locked to the vessel; the reported Z w.f. moment can be used to estimate if and how much w.f. turret rotation exists if the value of the turret “stiction” and “friction” in the given net load environment is available.