System Dynamics Applications

Time in System Dynamics Models


Home
Up
Demonstrations
Models
Case Studies
Other Resources
Subscribe Here

Click here to register for our free system dynamics applications email alert!

Argos Press Home

System Dynamics Pitfalls and Pointers

Time in System Dynamics Models

System dynamics modelling is time-domain modelling in which we set out to formulate and analyse how cause-and-effect relationships work to produce variations over time. Building rigorous, reliable and meaningful system dynamics models demands a sound understanding of time, and how to represent the passing of time in models. In system dynamics modelling, we are interested in five distinct representations of time:

  • Time Horizon—length of a planned simulation, from a defined start time to a defined stop time.
  • Time Status—current simulation time, which will lie somewhere between the defined start and the defined stop time, and includes the start and stop times.
  • Elapsed Time—time elapsed since the current simulation commenced.
  • Time Unit—the chosen unit of time used throughout the simulation for the purpose of making calculations and providing reports.
  • Delta Time, dt or Timestep—the increment of time by which the current simulation progresses once of a given single cycle of calculations has been completed.

     The following defines the meaning of time and how to correctly represent it in system dynamics models .

 

Please contact Argos Press to request permission to reproduce, broadcast, adapt and communicate our content (including this entry on Time in System Dynamics Models). © Argos Press Pty Ltd, Canberra, 2003-2005. All rights reserved.

Return to System Dynamics Pitfalls and Pointers