Bühlmann decompression algorithm: Difference between revisions

Revision as of 13:40, 30 July 2023

Revision as of 18:48, 7 August 2023

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<math>P_{tol} = (P - a)\cdot b</math>

The <math>b</math> values calculated do not correspond to those used by Bühlmann for tissue compartments 4 (0.7825 instead of 0.7725) and 5 (0.8126 instead of 0.8125).<ref name="Buhlmann-a-b-2002" />.

Versions B and C have manually modified<ref name="Buhlmann-a-b-2002" /> the coeffcient <math>a</math>.

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Some approaches only take into account the main inert gas (and ignore the other inert gas).

With Bühlmann,<ref name="Buhlmann-trimix" />, a weighted average of the half-times and coefficients <math>a</math> and <math>b</math> is calculated as a function of the percentage of each inert gas to calculate a specific set of parameters.

'''Example :'''

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'''ZH-L 16 (1986)'''

* ZH-L 16 or ZH-L 16 A: The experimental set of parameters published in 1986.<ref name="Buhlmann-2019" />.

* ZH-L 16 B: The set of parameters modified for printed dive table production, using slightly more conservative “a” values for tissue compartments #6, 7, 8 and 13.

* ZH-L 16 C: The set of parameters with more conservative “a” values for tissue compartments #5 to 15. For use in dive computers.

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'''ZH-L 8 ADT (1992)'''

* ZH-L 8 ADT: A new approach with variable half-times and supersaturation tolerance depending on risk factors.<ref name="Völlm-1" />. The set of parameters and the algorithm are not public (Uwatec property, implemented in Aladin Air-X in 1992 and presented at BOOT in 1994). This algorithm may reduce the no-stop limit or require the diver to complete a compensatory decompression stop after an ascent rate violation, high work level during the dive, or low water temperature. This algorithm may also take into account the specific nature of repetitive dives.

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<ref name="Workman65">{{cite journal |last=Workman |first=Robert D. |title=Calculation of decompression schedules for nitrogen-oxygen and helium-oxygen dives.|year=1965 |journal=NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL |volume=Research rept. |url=https://apps.dtic.mil/sti/citations/AD0620879 |access-date=2023-07-29 }}</ref>

<ref name="Völlm-1">{{cite web|url=https://www.divetable.info/BS_ZH/Buehlmann_Algorithms.pdf |title=Bühlmann algorithm for dive computers|last=Völlm|first=Ernst |access-date=29 July 2023 }}</ref>

.<ref name="Smart">{{cite web|url=http://users.skynet.be/sky68333/Theorie/Tabellen/Ver_bijl.pdf|title=Smart microbubble management|last=Staff|work=In Depth|publisher=Uwatec|access-date=12 March 2016}}</ref>