April 6, 2017

Part 1: LABs: Hypothetical Snorting times, Crew shifts & Battery discharge schedules

Below Anonymous has constructed a hypothetical Table and Figure for situations involving lead-acid batteries (LABs).  

Later this week (probably on April 5 and 7) Pete will publish Tables and Figures involving AIP and LIBs which Anonymous constructed.

By Friday this will amount to three articles which I will run together. This is noting that the blog publishing capacity does not appear technically able to publish 4 or 5 high capacity tables/figures in a stable way.

Table 1 (below) - Routines over 24 hours for a LAB-submarine:
-  "Time/Snorting" The four coloured rows represent: 2 hours (in green) to snort at night - 
    when it is a dark night. Then 1 hour of snorting (in green) when it is still a dark night.
    Purple represents fully submerged operation on LABs. 

-  The row "Shift" represents a three shift work system
    In this system, each shift of submariners works for 6 hours then rests for 12 hours.
    (red = shift A, yellow = shift B and blue = shift C)


Time/
Snor
ting
18
19
20
21
22
23
24
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18-
24
























00-
06
























06-
12
























12-
18
























Shift

























The Green Snorting times in Table 1 (above) coincide pictorally (as closely as I can get them!) with the times in Figure 1 below).

MW
























10.05
























10.00
























9.75
























9.50
























9.25
























9.00
























8.75
























8.50
























8.25
























8.00
























7.75
























7.50
























7.25
























7.00
























6.75
























6.50
























time
18
19
20
21
22
23
24
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17

Figure 1 (above) represents a LAB capacity of 10MW.  

-  For a LAB an average discharge depth might be down 35%. [Discharge depth means 
   ratio of discharged capacity to capacity of batteries. A discharge depth of 35% means that
   35% of energy of battery is released. In LABs, a deep discharge depth such as 70% would
   cause irreversible damage to the batteries. For LIBs a deep discharge depth may be as
   far down as 90%]

-  Just before the first recharge, high speed performance is limited by the shortage of 
   capacity of the LABs. Timing of snorting will be affected by large waves or storms
   [Pete Comment - The need for greater flexibility in snorting times is a major reason why
   Japan has developed snorkel generation equipment for higher "sea states" = larger waves
   or more severe storms. Such a new snorkel may be included in 29SS, the first submarine of
   a new class after the Soryu].

Anonymous and Pete

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