GHS Tutorials: Intact and Damage Stability

How to perform a stability analysis in GHS? These tutorials explain the process.

Will the ship flip over?  GHS has the answers, if you can ask the right question.  These updated GHS tutorials cover intact stability analysis and damage stability analysis.  If you are a junior naval architect, the boss will likely assign you to do a stability analysis.

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.

Intact 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.

510 GHS Limits:  

How to construct stability limits in GHS.

520 GHS GZ Curve:  

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

530 GHS Heeling Moments:  

How to add heeling moments like wind and passenger loading.

520 IMO Wind Roll in GHS:  

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

Damage Stability Analysis

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.

610 GHS Damaging Compartments:  

How to actually flood compartments in GHS.

620 GHS Deterministic Damage Stability:  

How to perform a deterministic damage stability analysis.

630 GHS Probabilistic Damage Stability:  

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

640 GHS Floodable Lengths:  

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 wpAdmin@dmsonline.us