Motion Calculations in Staad.Offshore

Question

Hi, 
 I am trying to figure out the equations used to generate motion accelerations in Staad.Offshore. 
 Take for example, using the "without gravity/tilt option", in obtaining Ax, Ay, Az, what does all the individual components (i.e. ary*cos(teta-phiry)*Z) represent? Is there a diagram to illustrate the direction/signage of how these components are obtained. 
 I am using Staad.Offshore version 3.0.1.2. Is all the equations in the help file under section 4.2 "Transport" correct?

Carlos Aguera · Answer

The logic of the equations shown in the help are showing how the effects of the applied rotational and lateral motions in a wave cycle (theta being the point throuh the wave cycle) that may be out of phase (described by component phi for that motion), combine to determine the overall acceleration.