Feedback control for system tuning
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Feedback control is a process for controlling dynamic systems through continuous monitoring of outputs and adjusting inputs as needed. It works by comparing the actual output to a target setpoint and using that error to determine input adjustments to counteract deviations. A conceptual model involves a controller comparing feedback from the system output and error to the setpoint to determine new input values. The document provides an example of using feedback control to maintain someone's effective work hours at a target level and discusses benefits like automatic self-correction to changes.
Feedback control for system tuning
- 1. Feedback Control for System Tuning Cody Rioux - @codyrioux Real-Time Analytics - Insight Engineering
- 2. Overview ● Feedback Control ○ Definition ○ Conceptual Model ● Concepts ○ Math ○ Rules of Thumb ● Case Study ○ Controlling Chris’ Effective Hours ● Recap
- 3. Controlling dynamic systems through continuous feedback. Feedback Control
- 4. What is Feedback Control? A form of Process Control for controlling the behavior of black box systems.
- 5. Example: Driving a Car Photo Credit @dinkyhim
- 6. Cody Engine Accelerator Speed Whats a setpoint? If you drive like me... No regard for the speed limit, you’re just a feed-forward automaton.
- 7. You (Driver) Engine (V8) Accelerator Speed Speedometer Speed Limit Driving A Car
- 8. Cruise Control Engine (V8) Accelerator Speed Speed Reading Speed Limit What if we got a machine to do it?
- 9. System Input Output A Conceptual Model
- 10. Controller System Input OutputSetpoint A Conceptual Model This happens to be a feed-forward system.
- 11. Controller System Input Output Feedback / Error Setpoint A Conceptual Model
- 12. Controller System Input Output Feedback / Error Setpoint A Conceptual Model
- 13. Controller System Input Output Feedback / Error Setpoint A Conceptual Model
- 14. Controller System Input Output Feedback / Error Setpoint A Conceptual Model
- 15. Controller System Input Output Feedback / Error Setpoint A Conceptual Model
- 16. Controller System Input Output Feedback / Error Setpoint A Conceptual Model
- 17. Feedback Principle Continuously compare the actual output to its desired reference value; then apply a change to the system inputs that counteracts any deviation of the actual output from the reference.
- 18. You’ll need an advanced math degree for these... Concepts
- 19. Controller System Input Output Feedback / Error Setpoint A Conceptual Model
- 20. error = setpoint - output
- 21. input = gain * error
- 22. Things to keep in mind...
- 23. Gain controls the magnitude of our adjustments. This is important.
- 25. Univariate feedback is inherently simple, multivariate feedback inherently complex.
- 26. Prefer small and frequent adjustments to large infrequent adjustments.
- 28. Oscillation creates instability. We don’t like that.
- 30. End-to-end control system for maximum analytics productivity. Case Study: Controlling Chris’ Caffeine Intake
- 35. What if this were... ● … a timeout value? ● … a queue size? ● … a server cluster size?
- 36. We can keep Chris rolling at 8 hours a day 365 if we wanted to. Recap
- 37. Benefits of Feedback Control ● Automatic - No Need for Analytical Model ● Dynamic - System responds to change ● Real Time - Change Happens Fast ● Self-Correcting - Mistakes are Quickly Corrected
- 38. Feedback control is a viable solution for configuring systems under dynamic conditions.
- 39. Only Scratching the Surface ● Integral Controllers ● Derivative Controllers ● PID Controllers ● Statistical Process Control
- 40. Literature Feedback Control for Computer Systems (Janert, 2013)
Editor's Notes
- #18: We don’t have to know anything about the behaviour of the system.