GHS Tutorials: Intact and Damage Stability

Your first step:  ask the boss if they want intact or damage stability analysis.  This will impress the boss and convince them that you know how to do a stability analysis in GHS.  Your second step:  watch these tutorials and learn how to actually do said stability analysis.

The main challenge of intact stability analysis is the regulations.  A single analysis typically involves several different sets of criteria.  Those criteria will each have several stability requirements.  You must take that regulatory language and encode it as mathematical limits within GHS.  Learn to the love the Limits command.   Some regulations may even specify sources of different heeling moments.  Learn how to apply those.  One notoriously difficult criteria is the IMO severe wind and roll criteria.  This requires a very specific command sequence to implement in GHS.  Pay careful attention here.

How to construct stability limits in GHS.

How to construct a GZ curve in GHS and use this to evaluate limits.

How to add heeling moments like wind and passenger loading.

How to apply the specific criteria for IMO severe wind and roll.

A damage stability analysis is much like an intact stability analysis.  Read the regulations, encode your stability criteria as mathematical limits.  Evaluate stability.  But now we have another layer of complication.  You must check the stability criteria for all specified damage conditions.  A damage condition is a specific combination of flooded compartments.  The regulations give you rules to determine which combinations of compartments you must damage.  These tutorials teach you how to apply those rules in GHS.

How to actually flood compartments in GHS.

How to perform a deterministic damage stability analysis.

How to use the damage stability wizard for probabilistic damage stability analysis.

How to perform a floodable lengths analysis in GHS.

Each tutorial includes homework problems, complete with solutions.  If you find any issues with any of the homework problems, just let me know and I will correct them.  You can contact me through the website, or email me at [email protected]