System dynamics majors fair

356 views
196 views

Published on

system dynamics

Published in: Education, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
356
On SlideShare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
5
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

System dynamics majors fair

  1. 1. Major: System Dynamics Slide show brought to you by: WPI Social Science & Policy Studies And WPI System Dynamics Club Author: David Liu
  2. 2. Basic System Behaviors Exponential Growth S-shaped Growth 1: Level 1: 1: System Level 1000.00 1: 1000.00 1 1 1: 1 500.00 1: 500.00 1: 0.00 1 1 1 1: 0.00 1 0.00 3.00 6.00 Graph 1 (Untitled) 9.00 Time 12.00 7:00 PM Tue, Nov 14, 2000 5.00 10.00 Graph 1 (Untitled) Goal Seeking 15.00 Time 20.00 10:05 PM Tue, Nov 14, 2000 S-shaped Growth with Overshoot 1: System Level 1 1: 1 0.00 1: System Level 200.00 1: 1 1400.00 1: 1 700.00 1 1 1 1: 150.00 1 1 1: 100.00 0.00 3.00 6.00 Graph 1 (Untitled) 9.00 Time 12.00 1: 0.00 1 0.00 7.50 9:18 PM Tue, Nov 14, 2000 15.00 Graph 1 (Untitled) 22.50 Time 30.00 10:18 PM Tue, Nov 14, 2000 Oscillation Overshoot and Collapse 1: 1: 2: 1: System Level 1: System Level 1 350.00 2: Carrying Capacity 55.00 1000.00 2 1 1 1: 1: 2: 200.00 30.00 500.00 1 1 2 1 1 1 1: 2: 1: 50.00 1 5.00 0.00 2 0.00 0.00 10.00 Graph 1 (Untitled) 20.00 Time 30.00 9:29 PM Tue, Nov 14, 2000 40.00 1.88 Graph 1 (Untitled) 3.75 Time 2 5.62 10:29 PM Tue, Nov 14, 2000 7.50
  3. 3. Exponential Growth Positive feedback loops generate growth, amplify deviations, and reinforce change. 1: Level System Level 1: 1000.00 1 Inflow 1: 500.00 1 Net increase rate 1 1 1: 0.00 0.00 3.00 Graph 1 (Untitled) 6.00 Time 9.00 7:00 PM Tue, Nov 14, 2000 12.00
  4. 4. Goal Seeking Negative feedback loops seek balance, equilibrium, and stasis. Corrective Action System Level 1: System Level 1 1: 200.00 1 1 1 1: 150.00 1 Discrepancy Rate of change Goal 1: 100.00 0.00 3.00 Graph 1 (Untitled) 6.00 Time 9.00 9:18 PM Tue, Nov 14, 2000 12.00
  5. 5. Oscillation Time delays cause the state of system to constantly overshoots its goal or equilibrium state, reverses, then undershoots, and so on. Corrective Action System Level 1: System Level 1 1: 350.00 1 1: 200.00 1 Perception 1 Perception Delay Discrepancy 1 Rate of change Goal 1: 50.00 0.00 10.00 Graph 1 (Untitled) 20.00 Time 30.00 9:29 PM Tue, Nov 14, 2000 40.00
  6. 6. S-shaped Growth No real quantity can grow (or decline) forever, eventually one or more constraints halt the growth. Net Increase Rate System Level 1: System Level 1: 1000.00 1 1 1: 500.00 Resource Adequacy Normal Growth Rate 1 Carrying Capacity 1: 0.00 1 0.00 5.00 Graph 1 (Untitled) 10.00 Time 15.00 10:05 PM Tue, Nov 14, 2000 20.00
  7. 7. S-Shaped Growth with Overshoot Time delays in lead to the possibility that the state of the system will overshoot and oscillate around the carrying capacity. 1: System Level 1: Net Increase Rate 1400.00 System Level 1 1 1: 700.00 Resource Adequacy 1 Delayed Resource Effect 1: Normal Growth Rate Carrying Capacity 0.00 1 0.00 7.50 Graph 1 (Untitled) 15.00 Time 22.50 10:18 PM Tue, Nov 14, 2000 30.00
  8. 8. Overshoot and Collapse The ability of the environment to support a growing population is eroded or consumed by the population itself. Consumption rate 1: System Level Carrying Capacity 1: 2: 2: Carrying Capacity 55.00 1000.00 2 1 Erosion of Carrying Capacity Net Increase Rate System Level 1: 2: 30.00 500.00 1 2 1 1: 2: 5.00 0.00 2 0.00 Normal Growth Rate Resource Adequacy 1.88 Graph 1 (Untitled) 3.75 Time 1 2 5.62 10:29 PM Tue, Nov 14, 2000 7.50
  9. 9. Applications of System Dynamics • Constructing better mental models • Simulating & experimenting with computer models • Use the same engineering tools to experiment with and to solve many messy problems of: – – – – – Management Government Economy Environment Other dynamic systems
  10. 10. Applications of System Dynamics • Constructing better mental models • Simulating & experimenting with computer models • Use the same engineering tools to experiment with and to solve many messy problems of: – – – – – Management Government Economy Environment Other dynamic systems

×