Optimization of shipboard manning levels using IMPRINT Pro Forces Module
Shattuck, Nita Lewis
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The Improved Performance Research Integration Tool (IMPRINT) is a dynamic, stochastic, discrete-event modeling tool used to develop a model of the system of interest. In this project, we used the IMPRINT Pro Forces Module to build models of the crew of the Littoral Combat Ship (LCS). The basic concept underlying the development of a model using the Forces module is that crewmembers spend all of their time in some sort of “planned” activities/events. In the context of the model, this term refers to activities typically occurring in the ship’s daily schedule (e.g., specified times for meals, personal time, watch standing [for crewmembers who stand watch], training, preventive maintenance, sleep, etc.). These planned activities, however, are interrupted or “augmented” by unforeseen emergencies and events (i.e., unplanned activities to which the crew must respond and resolve) such as flooding, collision, equipment casualties, etc. Phase 1 of this effort was focused on model development for naval applications—specifically, to validate the use of IMPRINT Pro Forces model simulations for the LCS manpower requirements (Hollins & Leszczynski, 2014). This phase included two tasks. First, to develop the design concept of a model describing the manpower requirements of LCS-1 Freedom. Second, to develop the appropriate manning models in IMPRINT. Phase 1 successfully showed that IMPRINT Pro Forces could be used to estimate manning levels with regard to the distribution of crew rates and required qualifications (Navy Enlisted Classifications [NECs]) for the LCS 1 mission requirements through simulations of planned and unplanned events, based on actual data collected from the LCS crew. Building upon that work, Phase 2 further investigated the usefulness of Forces model simulations by focusing on determining which individual crewmembers should maintain particular qualifications (Albrecht, Fitzsimmons, Chambers, & Schultz, 2014). This study looked at one set of crewmembers, based on the current Preliminary Ship Manning Document (PSMD) with regard to crew rates, as well as required qualifications (or NECs), to determine the effects of normal underway operations—as well as unplanned events—on the fatigue levels of a typical LCS crew. The model predicts that, at current manning levels, certain critical rates (particularly engineers and combat systems sailors) consistently get the least amount of sleep, accomplish the most amount of work, and respond to more unplanned events. Phase 3 recommendations for future work are described for the upcoming fiscal year.
Approved for public release; distribution in unlimited.
NPS Report NumberNPS-OR-15-008
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