seakeeping analysis (RAO)

hi,
i've done seakeeping analysis by using Maxsurf Seakeeper.
my analysis is comparing the RAO for heave and pitch motion on different wave height.
however, the results obtained is a same graph of heave and pitch for all wave height.
is it true?
if not, what is it that i'm possibly wrong?

really need help.

thank you.

 

Response Amplitude Operators (RAOs) are non-demsionalized factors and are assumed to be linear. They are constant for all wave heights (amplitudes really) of a given period.

Therefore

heave response amplitude (ft or m) = wave amplitude (ft or m) * RAO

and

pitch response amplitude (rad) = wave amplitude (ft or m)/characteristic length (ft or m) * RAO

 

thank you sir.
really appreciated that.