RGBM Algorithm

[voidware]

Is the algorithm for RGBM publicly available?

 

[Munin]

No.

 

[chrispete]

From what I understand, you can purchase the source code in either Cobol or C for around $3000...

 

[madmole]

The equations and theory behind it are widely available on the web and in Bruces book

You could easily write your own from this.

Or download the Suunto Dive program from their site where you can simulate dives using their RGBM model

 

[jeffsterinsf]

...TDID seems to completely omit the equations of state required to track actual bubble volume, only talking about the constraint on the (scaled) number of bubbles. This results in the folded-Haldane method. Suunto has confirmed that this is the type of algorithm that they use. This method reduces the gradients by an amount scaled by the nucleus regeneration time, reverse-profile diving, and multi-dive factors. Interestingly, the reverse-profile factor does not seem to have any time constant that lets the penalty decay with time -- you're penalized for a 100' dive "forever" if you take the math in TDID as complete.

There is apparently a "full-blown" RGBM that takes into account the volume itself, but I have yet to locate the papers which discuss enough of the math to model anything similar.

Is anyone familiar with the papers published by BRW that cover this? My access to university libraries is not what it once was...

 

[BRW]

Guys,

First, Mike, if this is inappropriate,
please feel free to kill -- all certainly
understand this is not an advertising site.

Thanks for questions and here are some
answers about RGBM software, papers,
folded versus full blown RGBM, etc.

1)- RGBM Website coming up, will sell
executable full blown RGBM for Windows,
RGBM papers, RGBM tables, etc. Prices
not set, but RGBM software package will
be about $150. Tables for nitrox, heliox,
and trimix will be about $75 (OC and RB).

2)- source version (Fortran) of full RGBM is
licensed for $7500 -- means source code
(ABYSS, Hydrospace, Mares, Dacor, others).
We may also make this available to other
deco software purveyors, but up to now,
it has only been released to meter folks.

3) - folded version of RGBM customized
to user Haldane M-values, NDLs, etc
is $3500 (Suunto, Mares, Dacor, ABYSS,
Hydrospace, Plexus, others not mentioned).

4) - new book "Reduced Gradient Bubble Model
And Applications" going to press (Best
Publishing), and has all EOS, mass
transport, seed excitation info, plus
apps, validation, testing, stats, etc.
If pressured, I might release without
Figures to this site -- 70 pages
long.

5) - papers on RGBM at RGBM website will
contain math and physics appropo.

6) - tech RGBM tables, like recreational
RGBM (NAUI) tables, use full RGBM
(thus give deep stops, helium
advantages naturally, not imposed
ad hoc like gradient factors, deep
halving, etc).

Muchas, and I hope this clears up some
confusion.

BW

 

[boomx5]

When is the RGBM website going live?

 

[chrispete]

2)- source version (Fortran) of full RGBM is licensed for $7500

I stand corrected, was going off of memory

 

[jeffsterinsf]

BRW once bubbled...
Guys,
First, Mike, if this is inappropriate,
please feel free to kill -- all certainly
understand this is not an advertising site.

Thanks for the questions and here are some
answers about RGBM software, papers,
folded versus full blown RGBM, etc.
[...]
4) - new book "Reduced Gradient Bubble Model
And Applications" going to press (Best
Publishing), and has all EOS, mass
transport, seed excitation info, plus
apps, validation, testing, stats, etc.
If pressured, I might release this
without Figures to this site -- 70 pages
long.

5) - paper(s) on RGBM at RGBM website will
contain math and physics appropo.
[...]

Muchas, and I hope this clears up much
misinformation.

BW

I, for one, would greatly value the dessimination of this information in a more accessible format. My goal is to gain an understanding of the current thinking in models so that I can better use any commercial tools that take full advantage of the proper fitting of parameters to data and field testing of those results.

Access to the pre-print (table-less) version of your new book, as well as some of the other scholarly works, would be most welcome.

Thanks for the clarifications and the offers...

 

[Dr Deco]

Dear Readers:

There is much information in BRW’s reply.

Many thanks, Bruce, for the posting.

Dr Deco :doctor: