Open Loop Operation
Open Loop Operation - Related Videos
06:34
Operation of a 25 KWth Calcium Looping Pilot-plant with High Oxygen Concentrations in the Calciner
0 Views •
Cited by 7 •
2017
This manuscript describes a procedure for operating a calcium looping pilot-plant for post-combustion carbon capture with high oxygen concentrations in the calciner in order to reduce or eliminate the flue gas recycle.
17:15
Catheterization of Intestinal Loops in Ruminants
0 Views •
Cited by 4 •
2009
We describe a novel surgical method for catheterizing 'intestinal loops' within the ileum of sheep. Once animals have recovered from surgery and have cleared antibiotics and analgesics, multiple treatments can be deposited directly in loops via the catheters.
09:15
Measuring Pressure Volume Loops in the Mouse
0 Views •
Cited by 16 •
2016
This manuscript describes a detailed protocol for the collection of pressure-volume data from the mouse.
07:57
Operating the Glovebox
0 Views •
2023
Robert M Rioux, Ajay Sathe, Zhifeng Chen, Pennsylvania State University, University Park, PA A glovebox is an isolated enclosure that is designed to maintain an inert atmosphere. The manipulation of chemicals or apparatus is done via the use of gloves, which allow operation while still maintaining an inert atmosphere. A positive pressure is utilized to compensate for any passive leaks. Objects can be transferred in and out of the box using an antechamber that acts as an airlock between the box...
01:01
Feedback Loops
0 Views •
2025
In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone. Blood-sugar Levels For example, an increase in blood glucose levels releases the hormone insulin from beta cells of the pancreas into the bloodstream, delivering insulin to cells throughout the body.
FAQs
In open loop operation, the controller determines the actuator command from the input or a programmed sequence, not from the actual output. The command therefore follows a planned relationship between input and action. This arrangement keeps the control path straightforward and avoids the measurement and comparison stage that a feedback-based system requires, which helps explain its simplicity and low cost.
Because no output comparison occurs, disturbances, load changes, and measurement errors do not trigger an automatic correction. The resulting output can depart from the intended value even when the command itself is unchanged. This sensitivity is a central performance consideration: open loop operation is most appropriate when operating conditions are predictable or when exact output regulation is not essential.
Compared with closed-loop operation, open loop operation trades adaptability for simpler implementation. A closed-loop arrangement can use output information to correct deviations, whereas an open-loop arrangement continues according to its predetermined command. The choice therefore depends on whether the application prioritizes rapid, uncomplicated control or improved accuracy and responsiveness to changing conditions.
An engineering workflow begins by specifying the desired input or sequence, relating that command to the required actuator action, and programming or setting the controller accordingly. The system then applies the command to the actuator while the process runs. Evaluation focuses on whether the resulting output is acceptable under expected conditions, since automatic correction is unavailable.
An open-loop setup requires a controller that can issue a predetermined command, an actuator that converts the command into system action, and the controlled process itself. Depending on the application, the command may be time-based, input-based, or sequential. The arrangement does not require an output measurement to drive correction, supporting relatively simple and low-cost implementations.
Timers, traffic signals, washing machines, and basic motor drives illustrate where this strategy can be useful. These systems can follow programmed timing, sequencing, or drive commands without continuously regulating the final output. In engineering, such examples show how open loop operation provides rapid control when predictable behavior is sufficient, while also highlighting situations where feedback may later become necessary.