Q: Do I need to calculate the RAOS before a time domain analysis if I want to include radiation and (or) Coriolis forces?
REV 7.05

A: The drift force has three components.

1. mean drift which is always present (we will call this static drift)

2. dynamic drift which is due to the motions of the body (we will

call this radiation), and

3. a force due to any rotational motion (Coriolis).

The results of TDOM are dependent on the RAO calculations. You need to compute the RAOs before you perform a time domain analysis if you are going to be including radiation and Coriolis terms.