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High-Authority Control/Low-Authority Control

From ^{(Andre Preumont, 2018)}:

The HAC/LAC approach consist of combining the two approached in a dual-loop control as shown in Figure 1. The inner loop uses a set of collocated actuator/sensor pairs for decentralized active damping with guaranteed stability ; the outer loop consists of a non-collocated HAC based on a model of the actively damped structure. This approach has the following advantages:

• The active damping extends outside the bandwidth of the HAC and reduces the settling time of the modes which are outsite the bandwidth
• The active damping makes it easier to gain-stabilize the modes outside the bandwidth of the output loop (improved gain margin)
• The larger damping of the modes within the controller bandwidth makes them more robust to the parmetric uncertainty (improved phase margin)

Bibliography

Preumont, A., Vibration control of active structures - fourth edition (2018), : Springer International Publishing. ↩