Vensim

Vensim
Developer(s) Ventana Systems, Inc.
Initial release 1990
Stable release
Version 6.4 / June, 2016
Written in C
Operating system Windows & OS X applications, Linux & iOS libraries
Type Simulation software
License Proprietary
Website vensim.com

Vensim is simulation software developed by Ventana Systems. It primarily supports continuous simulation (system dynamics), with some discrete event and agent-based modelling capabilities. It is available commercially and as a free "Personal Learning Edition".

Modeling environment

Vensim provides a graphical modeling interface with stock and flow and causal loop diagrams, on top of a text-based system of equations in a declarative programming language. It includes a patented method for interactive tracing of behavior through causal links in model structure,[1][2][3] as well as a language extension for automating quality control experiments on models called Reality Check.[4]

The modeling language supports arrays (subscripts) and permits mapping among dimensions and aggregation. Built-in allocation functions satisfy constraints that are sometimes not met by conventional approaches like logit.[5] It supports discrete delays, queues and a variety of stochastic processes.

There are multiple paths for cross sectional and time-series data import and export, including text files, spreadsheets and ODBC. Models may be calibrated against data using optimization, Kalman Filtering[6] or Markov chain Monte Carlo methods. Sensitivity analysis options provide a variety of ways to test and sample models, including Monte Carlo simulation with Latin Hypercube sampling.

Vensim model files can be packaged and published in a customizable read-only format that can be executed by a freely available Model Reader. This allows sharing of interactive models with users who do not own the program and/or who the model author does not wish to have access to the model's code base.[7]

Applications

Vensim is general-purpose software, used in a wide variety of problem domains. Common or high-profile applications include:

See also

External links

References

  1. ↑ "Vensim Causal Tracing™". Vensim - Ventana Systems.
  2. ↑ "Simulation system employing causal tracing. US Patent Application EP19910909851, Feb. 26 1991".
  3. ↑ "Applying successive data group operations to an active data group. Patent # 5,428,740". Justitia.com.
  4. ↑ Peterson, David W.; Eberlein, Robert L. (1994). "Reality check: A bridge between systems thinking and system dynamics". System Dynamics Review. 10 (2-3): 159–174. doi:10.1002/sdr.4260100205.
  5. ↑ Vensim Allocation by Priority
  6. ↑ Peterson, David Walter (1975). Hypothesis, estimation, and validation of dynamic social models : energy demand modeling (Ph.D.). Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science.
  7. ↑ "Vensim Model Reader". Vensim - Ventana Systems.
  8. ↑ Goldner, Daniel; Borener, Sherry (2006). Evaluating NGATS Research Priorities at JPDO. 6th AIAA Aviation Technology, Integration and Operations Conference (ATIO). Wichita, Kansas, US.
  9. ↑ Struben, Jeroen; Sterman, John D. (2008). "Transition Challenges for Alternative Fuel Vehicle and Transportation Systems". Environment and Planning B: Planning and Design. 35 (6): 1070–1097. doi:10.1068/b33022t.
  10. ↑ Sterman, John; Henderson, Rebecca; Beinhocker, Eric; Newman, Lee (2007). "Getting Big Too Fast: Strategic Dynamics with Increasing Returns and Bounded Rationality". Management Science. 53 (4).
  11. ↑ Deborah A. Marshall; et al. (2015). "Selecting a Dynamic Simulation Modeling Method for Health Care Delivery Research—Part 2: Report of the ISPOR Dynamic Simulation Modeling Emerging Good Practices Task Force". Value in Health. 18 (2): 147–160.
  12. ↑ Pruyt, E.; Kwakkel, J. H. (2014). "Radicalization under deep uncertainty: a multi-model exploration of activism, extremism, and terrorism". System Dynamics Review. 30: 1–28. doi:10.1002/sdr.1510.
  13. ↑ Rahmandad, H.; Hu, K. (2010). "Modeling the rework cycle: capturing multiple defects per task". System Dynamics Review. 26: 291–315. doi:10.1002/sdr.435.
  14. ↑ "Ventana Systems, Inc. Marketing Models". Ventana Systems.
  15. ↑ Anderson, Edward G., Jr.; Fine, Charles H.; Parker, Geoffrey G. (2000). "Upstream Volatility in the Supply Chain: The Machine Tool Industry as a Case Study". Production and Operations Management. 9 (3): 239–261.
  16. ↑ "The C-ROADS model". Climate Interactive.
  17. ↑ Sterman, John D.; Fiddaman, Thomas; Franck, Travis; Jones, Andrew; McCauley, Stephanie; Rice, Philip; Sawin, Elizabeth; Siegel, Lori (2013). "Management flight simulators to support climate negotiations". Environmental Modelling & Software. 44: 122–135. doi:10.1016/j.envsoft.2012.06.004.
  18. ↑ Weller, Florian; Sherley, Richard B.; Waller, Lauren J.; Ludynia, Katrin; Geldenhuys, Deon; Shannon, Lynne J.; Jarre, Astrid (2016). "System dynamics modelling of the Endangered African penguin populations on Dyer and Robben islands, South Africa". Ecological Modelling. 327: 44–56. doi:10.1016/j.ecolmodel.2016.01.011.
  19. ↑ Martinez-Moyano, I. J. (2012). "Documentation for model transparency". System Dynamics Review. 28: 199–208.
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