A model of scheduling in a two-port shipping system
Johnson, Rodwell Calhoun
Jones, Kevin K.
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A closed, dynamic, mathematical model is used to study scheduling in a two-port system. The model will predict on a daily basis: the amount of cargo waiting at each port for shipment; the status of each dock--empty or occupied and if occupied, by which ship; the destination, estimated-time-of-arrival, amount of cargo on board, number of days in port and at sea, and the daily speed for each individual ship. Upon completion of a test case, the model will predict, by ship: the total time at sea and the cost thereof; the total time spent in port including time lost waiting for a vacant dock; the overall voyage cost and the average-daily-cost of each ship. Additionally, the model will predict the total amount of cargo generated for shipment at each port and the maximum quantity it builds up to at any time. The model will predict the cost of warehouse space needed to store freight awaiting shipment by the system. The model will accept any combination of ship size and speeds desired. If required, the model will alter automatically a shjp's established ETA to insure that upon arrival at its destination a vacant dock with cargo waiting to be put on board will be available. The model has the following restrictions: It is limited to two ports. It assumes sufficient stevedore gangs and equipment to permit simultaneous loading and unloading of different vessels in the same port on a 24-hour basis. There is no distinction between different cargo classes. The model does not provide for cargo delays. The model considers its ships always in service with no time lost for maintenance. The model uses the same fuel-used vs. speed curve in calculating daily fuel consumption for all ships--regardless of their size, shape, or type of propulsion. The model uses the same average-daily-operating-cost-figure for all ships. Numerous test cases are studied to determine: (a) the effects of vessel size and speed on scheduling; (b) the benefits of altering a ship's speed to coincide with a vacant dock and c) the advantages of sailing a partially loaded ship to provide a vacant dock for an inbound ship.
This thesis document was issued under the authority of another institution, not NPS. At the time it was written, a copy was added to the NPS Library Collection for reasons not now known. It has been included in the digital archive for its historical value to NPS. Not believed to be a CIVINS (Civilian Institutions) title.
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