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The excitation by an active control system of modes of motion that have been omitted from the control algorithm in the process of model reduction.



Related Terms

OBSERVATION SPILLOVER

The part of the sensor output of an active control system caused by modes that have been omited from the control algorithm in the process of model reduction.

MODEL REDUCTION

The process of discarding certain modes of motion while retaining others in the model used by an active control system, in order that the control system can compute control commands with sufficient rapidity.

CLOSED LOOP

A control system that continually monitors the process, receives feedback of process changes, and then outputs corrections to a final control element to maintain a set point value.

GAINSCHEDULING

[CONTSYS] A method of eliminating influences of variations in the process dynamics of a control system by changing the parameters of the regulator as functions of auxiliary variables which correlate well with those dynamics.

DEAD TIME

  1. The time interval between a change in the input signal to a process control system and the response to the signal.
  2. The time interval, after a response to one signal or event, during which a system is unable to respond to another. Also known as insensitive time.

CONTROL ELEMENT

The portion of a feedback control system that acts on the process or machine being controlled. control hierarchy See hierarchical control.

MINOR LOOP

A portion of a feedback control system that consists of a continuous network containing both forward elements and feedback elements.

FEEDBACK COMPENSATION

Improvement of the response of a feedback control system by placing a compensator in the feedback path, in contrast to cascade compensation. Also known as parallel compensation.

COMPUTER-CONTROLLED SYSTEM

A feedback control system in which a computer operates on both the input signal and the feedback signal to effect control.

COMPENSATION

Introduction of additional equipment into a control system in order to reshape its root locus so as to improve system performance. Also known as stabilization.

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