LOADICATOR

naserrishehri

naserrishehri

Senior Member
Joined
Jun 22, 2006
Messages
237
Reaction score
2
Location
iran bushehr
I did stability analysis in MAXSURF STABILITY for a vessel and i want to prepare a user friendly
software by results, to use as LOADICATOR onboard the ship.
Do you have any idea?
 
As you know, there are many types of commercial ones. You can explore and get some ideas. Regardind the design, It depends a lot on your programming skills and the type of ship. I have created some tools on my own at work. In my case, I find that GUIs are extremely complicated and hard to modify.

What I usually do is using an Excel spreadsheet combined with VBA and Python. It’s easy for the user to change data, and everyone knows how to work with a spreadsheet
 
Lopolito said:
As you know, there are many types of commercial ones. You can explore and get some ideas. Regardind the design, It depends a lot on your programming skills and the type of ship. I have created some tools on my own at work. In my case, I find that GUIs are extremely complicated and hard to modify.

What I usually do is using an Excel spreadsheet combined with VBA and Python. It’s easy for the user to change data, and everyone knows how to work with a spreadsheet
Click to expand...
Thanks.
Stability analysis by VBA and python is difficult for me. I can use MAXSURF but exporting results is not user friendly for officers onboard.
 
I have made two loading instruments in my life, for two ships with simple loading conditions, and I can assure you that creating such software for a particular ship is a very complicated, labor-intensive and therefore very expensive job.
I don't see how communication could be established between Maxsurf and the user interface in order to exchange data/results between the two systems. It would be cheaper to train the officer in charge to use Maxsurf.
There may be companies that specialize in developing such software.
What type of ship is this?
 
TANSL said:
I have made two loading instruments in my life, for two ships with simple loading conditions, and I can assure you that creating such software for a particular ship is a very complicated, labor-intensive and therefore very expensive job.
I don't see how communication could be established between Maxsurf and the user interface in order to exchange data/results between the two systems. It would be cheaper to train the officer in charge to use Maxsurf.
There may be companies that specialize in developing such software.
What type of ship is this?
Click to expand...
Your are right.it's complicated.
I need it for container deck ships TEU~300.
 
Can't Maxsurf calculate KN curves of a ship? If so, a simple weight calculation of the specific loading condition resulting in a VCG would be sufficient. This should be doable with either Excel or a simple Python program. With Python you could even develop a loading optimizer which optimizes the stacking of containers for optimum stability (while keeping in mind minimum movements of containers onboard in harbour)
 
You could go even further and write a Python program which includes a definition of the hull, with the loading condition, some math and coding you could calculate the stability even without Maxsurf.

But since you are not into Python..
 
@mc_rash, If it were just a matter of stability under various loading conditions, Maxsurf does it perfectly, without the need to calculate the KN curves. For each loading condition the application calculates the CoG and CoB, the equilibrium buoyancy and, therefore, directly calculates the KN. The only problem is that in the case of a container ship, the introduction of the weights of the containers is very cumbersome. Here, as you say, a spreadsheet prepared for the ship in question could make the task much easier.
The loading instrument, however, is not intended to study the stability of the ship but the longitudinal strength of the hull in each of the various loading conditions. That is, the law of bending moments and shear forces must be calculated along the length of the ship, under hogging and sagging conditions. The difficult part, in this case, is to calculate the equilibrium flotation (which Maxsurf will do easily and quickly) and with it the distribution of buoyancy along the length. With this and the weight distribution we can check the longitudinal strength.
If I have explained something that you already knew, please excuse my intrusion.

Edited :
NOTE: I have always assumed that the OP already knew how to calculate stability with Maxsurf and that what he needed was a "loading instrument"
 
You are right @TANSL, I just learned something new. Actually it is quiet logical that the longitudinal strength should be included in a loadicator, I only considered stability.

Longitudinal strength calculation with Python would involve much more coding but it isn't impossible.
 
TANSL said:
@mc_rash, If it were just a matter of stability under various loading conditions, Maxsurf does it perfectly, without the need to calculate the KN curves. For each loading condition the application calculates the CoG and CoB, the equilibrium buoyancy and, therefore, directly calculates the KN. The only problem is that in the case of a container ship, the introduction of the weights of the containers is very cumbersome. Here, as you say, a spreadsheet prepared for the ship in question could make the task much easier.
The loading instrument, however, is not intended to study the stability of the ship but the longitudinal strength of the hull in each of the various loading conditions. That is, the law of bending moments and shear forces must be calculated along the length of the ship, under hogging and sagging conditions. The difficult part, in this case, is to calculate the equilibrium flotation (which Maxsurf will do easily and quickly) and with it the distribution of buoyancy along the length. With this and the weight distribution we can check the longitudinal strength.
If I have explained something that you already knew, please excuse my intrusion.

Edited :
NOTE: I have always assumed that the OP already knew how to calculate stability with Maxsurf and that what he needed was a "loading instrument"
Click to expand...
Thanks.
You are right. I have wrote a VBA in excel and i solved the stability problem but i can not calculate longi. Strength .
 
mc_rash said:
You are right @TANSL, I just learned something new. Actually it is quiet logical that the longitudinal strength should be included in a loadicator, I only considered stability.

Longitudinal strength calculation with Python would involve much more coding but it isn't impossible.
Click to expand...
The biggest challenge is long. Strength evaluation.
 
naserrishehri said:
The biggest challenge is long. Strength evaluation.
Click to expand...
Absolutely. It's necessary to calculate the distribution of weights and buoyancy along the length of the vessel. The second calculation isn't complicated if you have the area of the frames under each loading condition. The first calculation is considerably more complicated.
 
You must log in or register to reply here.
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making any potentially dangerous or financial decision, always employ and consult appropriate professionals. Your circumstances or experience may be different.

    • Back
    Top