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  #31  
Old 01-09-2013, 10:38 PM
DCockey DCockey is online now
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Join Date: Oct 2009
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Quote:
Originally Posted by Ad Hoc View Post
You may find these up your alley then:

"Application of a real-coded genetic algorithm for the fitting of a ship hull surface through a single non-uniform B-spline surface", Le T-H., Kim D-J.
JMST Vol 16, No.2 2011.
and
"Surface intersection in geometric modeling of ship hulls", Ventura M., Guedes Soares C.,
JMST, Vol 17, No.1 2012.
Thanks for the suggestions.

John Letcher has promoted his "relational geometry" system as better at dealing with surface intersections. I'm curious to see what Ventura and Guedes discuss.
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  #32  
Old 01-10-2013, 03:44 AM
Mikko Brummer Mikko Brummer is offline
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Originally Posted by fcfc View Post
Seems current trend:

See www.orc.org/minutes/ITC%202012.pdf , I a waiting for ORC VPP2013 documentation to be published to learn more.

Seems they no longer use delft series upright with a bunch of parameters. Only a dynamic waterline length, LVR (DLR the other way), and BTR (beam/dratft ratio). And they use heeled hull parameters, not uprigh hull parameters with heel correction.
Thanks... looks promising. It would appear that the new VPP is also allowing for leeway as an independent variable, although the document is not very clear about it (or anything else ;-). Anyway, leeway needs to be recalculated during every iteration loop for good results. The effective lenght calculation will certainly be better than the old one.
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  #33  
Old 01-10-2013, 03:46 AM
Mikko Brummer Mikko Brummer is offline
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Originally Posted by fcfc View Post
BTW, does anyone know how LSM (second moment length) are computed ?
There are some clues on page 21 chapter 4.2.2.4. http://www.orc.org/rules/ORC%20VPP%2...ion%202012.pdf
What I am missing is where is zero x stem or stern, and what unit (meter, feet).
And how is LSM0 is computed. Is it a recursive computation, since depth correction for section does include LSM0 term ?

Thanks.
Joakim could possibly comment on this?
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  #34  
Old 01-10-2013, 03:49 AM
Mikko Brummer Mikko Brummer is offline
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Quote:
Originally Posted by Remmlinger View Post
If the updated version of UliLines with more control over the topsides at the bow is of any help to you, I can try to speed up my work and release the update asap.
Uli
Thank you Uli - the Dehler 33 bow now looks good!
Attached Thumbnails
New Lines Prediction Program-dehler-33-dynanew.jpg  
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  #35  
Old 02-01-2013, 02:19 PM
Remmlinger Remmlinger is offline
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Join Date: Jan 2011
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UliLines_4.2

There is a new version 4.2 with better fairing and more control.
The user's manual can be downloaded at
http://www.remmlinger.com/UliLines.html
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