1 Control System Configuration Flashcards
SYSTEM CONFIGURATION
the control action is independent of the output.
Open-loop
SYSTEM CONFIGURATION
the control action is dependent on the output.
Close-loop
SYSTEM CONFIGURATION
The distinction is determined by the ____________, that quantity
responsible for activating the system to produce the ________.
control action, output
OPEN-LOOP CONTROL SYSTEM
The input (reference) controls the output (controlled variable) through a ________________. The output has ____________ on the control action.
control action process, no effect
Do not correct for disturbances and are simply commanded by the input.
open-loop (feedforward)
Ability to perform accurately is determined by calibration.
open-loop (feedforward)
They are not usually troubled with problems of instability.
open-loop (feedforward)
CLOSE-LOOP CONTROL SYSTEM
The output has an ________ on control action through ____________. The control action is actuated by an ____________ that maintain the output at a desired level.
effect, feedback, error signal
CLOSE-LOOP CONTROL SYSTEM
is that property of a closed-loop system which permits the output (controlled variable) to be compared with the input (reference) to the system so that the appropriate control action may be formed as some function of the output and input.
Feedback
CLOSE-LOOP CONTROL SYSTEM
If there is any difference between the two responses, the system ________ the plant, via the actuating signal, to make a correction.
drives
CLOSE-LOOP CONTROL SYSTEM
If there is no difference, the system ____________ the plant, since the plant’s response is already the desired response.
does not drive
Greater accuracy than open-loop systems.
close-loop (feedback control system)
Less sensitive to noise, disturbances, and changes in the environment.
close-loop (feedback control system)
Tendency toward oscillation or instability.
close-loop (feedback control system)
The response and error can be controlled by gain (amplification) adjustment in the loop and sometimes by redesigning the controller.
close-loop (feedback control system)
It is more complex and expensive than open-loop systems.
close-loop (feedback control system)
OPEN-LOOP VS CLOSE-LOOP
An ________________ system operates without feedback and directly generates the output in response to an input signal.
open-loop
OPEN-LOOP VS CLOSE-LOOP
A ____________ system uses a measurement of the output signal and a comparison with the desired output to generate an error signal that is used by the controller to adjust the actuator.
closed-loop
