SIMSCRIPT Solutions


TRANSPORTATION


Automated Port Facility Simulation - PORTSIM

Bechtel Corporation; San Francisco, CA

The simulation program PORTSIM models a three-berth automated port facility. The following entities are included in the model: Ships of various types and length, automated guided vehicles (AGVs) that move loads between the wharf side and the in- process storage area (IPS), wharf cranes, ship cranes, and IPS cranes.

Ships dock and sail from any one of three berths. Once docked, a ship uses its own cranes or requests some of the wharf cranes. The AGVs move the loads between the wharf side cranes and the IPS cranes, following a network of buried wires under the pavement. The cranes transfer their loads to/from the AGVs. The ship cranes or wharf cranes move from one hatch to another until the ship is loaded or unloaded. The IPS cranes move the loads from the location they met the AGVs (pickup/drop-off points) to their final location in the IPS area.

The model is driven by a ship event file and a transaction file. The first file contains the ship schedule, docking positions, and crane requests. The transaction file consists of work orders for the AGVs. Each record specifies the cranes and hatch the AGVs will be serving, together with the number of loads to be loaded/unloaded and the number of AGVs assigned to each transaction.

The simulation is displayed graphically on the screen while in progress, together with the status of each crane, and a simulation clock.

Alternatives Considered: Dbase III plus and Dbase IV were used to generate some of the network and simulate some of the facility queuing.

Benefits of SIMSCRIPT II.5: Ability to handle complex and large models, graphics capability.

Customer Quote: "Animation! SIMSCRIPT's capability to animate enabled us to present the simulation result of a very complex automated wharf (port) in an animated format instead of pages and pages of computer print out."