Ship Motion Calculator

06 Mar 2017 22:44 #32945 by timi
Ship Motion Calculator was created by timi
I made an excel sheet to calculate the motion factors for the rocking ships. I used to do this by parking a chopper on the pad, record it's angles while the ship rocks, average the results and adjust the factors. But I figured there must be a way to calculate that without this time consuming calibration part. So I took a good look at the code and figured it out.

The way it works is that you first select roll and pitch angles for the ship from this table:

Then you input those values to the excel sheet here:

Or to the LibreOffice sheet here:

Use the same values for pitch and heave. I pulled the heave motion out my hat by just thinking that maybe the same factor works since the motions are related.

Since the table is meant for moderate sea conditions I take that to mean 11 kts winds from the Beaufort scale:

So input 11 kts to the wind speed in the sheet. Now you should have the factors for the roll, pitch and heave animations on the sheet calculated for you.

The following user(s) said Thank You: Neilson, StuartC, enrogue, Viper

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