- Maximum natural frequency
Enter the target maximum natural frequency of poles of the tunable block, in the units
of the control system model you are tuning. Poles of the block are constrained to
satisfy |s| < MaxFrequency for continuous-time blocks, or |log(z)| <
MaxFrequency*Ts for discrete-time blocks with sample time Ts. This constraint
prevents fast dynamics in the tunable block.
Algorithms
When you tune a control system, the software converts each tuning goal into a normalized
scalar value f(x). Here, x is the vector of free (tunable) parameters in the control system.
The software then adjusts the parameter values to minimize f(x) or to drive f(x) below 1 if
the tuning goal is a hard constraint.
For Controller Poles Goal, f(x) reflects the relative satisfaction or violation of the goal.
For example, if your Controller Poles Goal constrains the pole of a tuned block to a
minimum damping of ζ = 0.5, then:
- f(x) = 1 means the damping of the pole is ζ = 0.5 exactly.
- f(x) = 1.1 means the damping is ζ = 0.5/1.1 = 0.45, roughly 10% less than the target.
- f(x) = 0.9 means the damping is ζ = 0.5/0.9 = 0.55, roughly 10% better than the
target.
See Also
Related Examples
- “Specify Goals for Interactive Tuning” on page 10-39
- “Manage Tuning Goals” on page 10-177
- “Visualize Tuning Goals” on page 10-187
10 Control System Tuning