Accession Number : ADA111753

Title :   Great Lakes Simulation Studies. Volume I. NETSIM: A General Network Simulator.

Descriptive Note : Interim rept.

Corporate Author : PENNSYLVANIA TRANSPORTATION AND TRAFFIC SAFETY CENTER UNIVERSITY PARK

PDF Url : ADA111753

Report Date : Nov 1972

Pagination or Media Count : 113

Abstract : NETSIM is a computer simulation model written in the SIMSCRIPT programming language whose purpose is to provide a general simulation capability for any network composed of links and nodes. The current use of NETSIM in multiple channel deep draft navigation systems has earned it the qualification NETSIM/SHIP. The model was developed for use by the U.S. Army Corps of Engineers with immediate applications on the Great Lakes systems. Ships are handled in NETSIM/SHIP on a chronological event basis as they engage in their journey from origin to destination. Simulation of ship processing at system facilities (locks, reaches, etc.) is carried out through the use of distinct link modules, and channel choice decisions where alternative routes exist are handled by a decision-making mechanism based on the calculation of expected transit times for each route. Required inputs consist of fleet data, run and system size parameters, and a description of the network configuration and system entities. Output produced by the model consists of data for the formulation of the channel choice mechanism in the first form, and an event by event description of the actual simulation in the second form. The latter form provides a permanent data base from which exactly tailored statistical reports can be generated. Although the model is complete as it currently exists, it is being further equipped with extensive capabilities for general, system wide simulation of the Great Lakes. Even without these capabilities, however, the current version of NETSIM/SHIP can be used as a planning tool to aid in the investigation of sub-system operating characteristics. (Author)

Descriptors :   *Inland waterways, *Water traffic, *Computerized simulation, Channels(Waterways), Input output models, Networks, Configurations, Great Lakes, Navigation, Marine transportation, User manuals, Linkages, Nodes, Locks(Waterways), Army Corps of Engineers, Sizes(Dimensions), Time

Subject Categories : Computer Systems
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE