RAM simulation model for SPH/RSV systems Page: 23 of 48
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The end-of-run snapshot variable descriptions, listed in Text Box 6, are self-explanatory for
the most part. A few output variables require a little further explanation. The variable "ave_lead"
is obtained by dividing "lead tot" by "resupply," or the total lead time divided by the number of
resupplies. The lead time for a given resupply period is the interval from the moment the SPH
communicates with the RSV to the completion of actual resupply efforts. The communication
normally occurs immediately following the execution of a mission, but it can also occur
following a resupply period during which the RSV did not have sufficient rounds to equip the
SPH. In this case, the RSV returns to the LRP for uploading, and the SPH waits to receive its full
complement of rounds. The lead time can reach large values if the RSV fails during the period it
is attempting to reach the SPH for resupply.
The SPH is not necessarily idle during the entire lead time period. The SPH may enact a
survivability move or execute a mission (if it is still armed) during that period if conditions
require these actions. However, most of the lead time period is normally completed by the SPH in
the wait mode.
The variable "waittot" should not be confused with "leadtot." The "waittot" refers to
the time spent in wait mode by the RSV, whereas "lead_tot" is specific to the SPH. The time
spent by the SPH in wait mode is not tracked by the Crusader model in Version 1.0.
The following "count" performance variables are found in the FAILCOUNTS snapshot
file. Count variables sort failures either by system (*_num) or RSV activity (*_fail).
Nine performance variables (see Text Box 7) are tracked and snapshots are saved at 15-min
intervals in the snapshot file called QUARTER-HOURLY. All variables stored in this file are
also stored in ENDRUN, except ROUNDS and ROUNDS2.
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Schryver, J. C.; Primm, A. H. & Nelson, S. C. RAM simulation model for SPH/RSV systems, report, December 31, 1995; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc669053/m1/23/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.