Fundamental Limits

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In this chapter we discuss properties that limit performance and robustness of control systems. Non-minimum phase dynamics, due to time delays and right half- plane poles and zeros impose severe limits. There are also nonlinear behaviors that appear at large and small signal levels. Large signal limits can be caused by limited rate and power of actuators, or by constraints required to protect the process. Small signal limits can be caused by measurement noise, friction, and quantization in converters. We also discuss consequences of the limits for loop shaping, and give rules for pole placement design.

Chapter contents

PDF (24 Jul 2020)

  1. System Design Considerations
    • Stabilizability and Strong Stabilizability
    • Right Half-Plane Zeros and Time Delays
  2. Bode's Integral Formula
    • Derivation of Bode's Integral Formula
  3. Gain Crossover Frequency Inequality
  4. The Maximum Modulus Principle
  5. Robust Pole Placement
    • Fast Stable Process Poles
    • Slow Stable Process Zeros
    • Design Rules for Robust Pole Placement
  6. Nonlinear Effects
    • Actuation Limits
    • Measurement Noise and Friction
  7. Further Reading

Teaching Materials

Supplemental Information