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Understanding Networked Control Systems: Challenges, Strategies, and Future Trends

This comprehensive overview delves into the world of Networked Control Systems (NCSs), exploring their structure, advantages, and performance factors. Key topics include network-induced delays, control strategies, and design approaches for effective NCS implementation. We analyze the impact of communication protocols, modeling techniques, and present solutions to mitigate delay issues. Moreover, we discuss candidate NCSs and simulation results highlighting the efficacy of various control strategies. The document concludes with insights into future trends and hardware implementations in the field.

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Understanding Networked Control Systems: Challenges, Strategies, and Future Trends

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Presentation Transcript

  1. 1 • Introduction • DCS Structure • Why NCSs ? • Factors Affecting NCSs Performance • Modeling of NCSs with Network–Induced Delay Delay / Sampling Time Ratio Effect  NCSs Design Approaches Candidate NCSs Control Strategies  Results  Conclusion & Future Trends

  2. 2 Control Network Introduction  What is Networked Control Systems ? Data Networks Versus Control Networks Concept of Distributed Control Systems

  3. 3 Local Data Links DCS Structure

  4. 4 Why NCSs ? • Easy Problem Diagnostic • Less Expensive • Complexity Management • Pervasive Flow of Mixed Data • Attractive Features of Serial Communication Network

  5. 5 Delay Mis-Sync NW Architecture NCS Buffer Saturation Noise Sampling Time Factors Affecting NCSs Performance

  6. 6 Modeling of NCSs with Network-Induced Delay Delay Models • Constant • Random

  7. 7 Delay < Sampling Period Longer Delays Delay/Sampling Time Ratio Effect

  8. 8 Existing NW NW To Be Designed Select Communication Protocol Delay is A Given Condition Control Strategies Minimize Delay NCSs Design Approaches Begin

  9. 9 Ethernet ControlNet DeviceNet MAC CSMA/CD Token Bus CSMA/AMP Overhead 26 byte 7 byte 47 bit Data Size 46-1500 B 0-510 B 0-8 B O.H Small Data More Okey Less Large Data Less Okey More Data Rate (Mbps) 10-100 5 0.5 C.E Small Data Large Data Worst Okey Best 98% 98% 58% Candidate NCSs

  10. 10 Simulation of a Real Dial-Up Internet Connection www.shunra.com www.yahoo.com

  11. 11 Control Strategies • Phase Lead & Phase Lag • Pole Placement • State Estimator • Deadbeat Results

  12. 12 Conclusion  Concept of NCS Focus on Delay Problem Proposed Solutions • Candidate Networks • Design Control Strategies Phase Lead Works Well Pole Placement is Delay Dependent State Estimator is the Best for Loss Deadbeat is the Fastest One

  13. 13 Future Trends Hardware Implementation • DC Motor • Applying a Control Strategy Simulation on IUG Network

  14. 14 For More Information Visit Our Website On: W W W . N C S I U G . 8 m . C O M

  15. 15 Thank You For your Good Listening

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