Q: Can MOSES simulate a two body, frequency domain lift in the Frequency Domain?
REV 7.03

A: Of course MOSES gives good results for what you have modeled. In reality, there are several ways that your model will break down.

• The frequency domain cannot take into account the nonlinearities of the connection such as a line going slack,
• You cannot look at the nonlinearities of the lifted body impacting the structure from which it was lifted,
• You cannot look at the slam when the lifted structure enters the water,
• You cannot look at the nonlinearities when the lifted body is set down, and finally
• There is probably no damping on the lifted body when it is in the air. This will cause unreasonably large motions of the lifted body in the neighborhood of the natural period of the "swinging mode". You should add some damping by either using one of the damping option on the connector definition or with #DRAG.

To fix all of the first four points, you can do the problem in the time domain.