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Summary Description of the Simulation Model Used for the Joint Logistics-Over-The-Shore (LOTS) Test and Evaluation Program

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Final rept. Dec 1976-Nov 1977

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This report outlines the LOTS simulation model being used in the test planning for a joint operational test scheduled for Aug-Sep 1977. The simulation is an expected value model adapted from one used by the U.S. Army. The model simulates a LOTS operation beginning immediately after the arrival of one or more cargo ships of various types at an off-shore site. Cargo is off-loaded to lighters which move to shoreside unloading locations and return to the ship for another load. Cargo at the shore is transferred to vehicles, and delivered to an inland destination. The simulation ends when all cargo has been transferred to an inland destination. The model provides a capability for performing a variety of sensitivity analyses for various mixes of the ship types, lighters, shoreside handling systems, materials handling equipment, and vehicles. Basic inputs include data on performance characteristics for LOTS equipment and cargo transfer times. Data inputs structure the particular system being simulated and the conditions under which they operate. By varying LOTS equipment assets changes in system productivity can be measured. The model is normally used to estimate minimum resources necessary to keep ship cranes or booms working and the total operating system in balance. Principal outputs are the total time required to off-load the ship and move cargo to a marshalling area, and the percentage utilization of the LOTS equipment material handling equipment, lighters and trucks.

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  • Marine Engineering

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