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Difference between revisions of "Feedback control"

(Physiology)
 
(One intermediate revision by one other user not shown)
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'''''Synonyms''': control circuit, control loop, closed-loop control, feedback interaction''<br>
 
'''''Synonyms''': control circuit, control loop, closed-loop control, feedback interaction''<br>
'''''German''': Regelkreis
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'''''German''': [[:de:Regelkreis|Regelkreis]]''
  
 
==Definition==
 
==Definition==
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==Physiology==
 
==Physiology==
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The physiological principle of feed-back control is that a controlled variable (f.e. pH, temprature, etc) is monitored by a sensor all the time. The sensor which is manly represented by an enzyme send the input to a comparator. The comparator compares the value to a set point. In the case of differences between the set point and the value sended by the sensor the comparator will send a signal to an effector which will in turn bring the value back to normality.
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Feedback control systems play essential roles in the organism. Examples are:
 
Feedback control systems play essential roles in the organism. Examples are:
 
*[[Osmoregulation]]
 
*[[Osmoregulation]]
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==External Link==
 
==External Link==
 
*[http://www.medical-cybernetics.de/ips/ Information processing structures at medical-cybernetics.de]
 
*[http://www.medical-cybernetics.de/ips/ Information processing structures at medical-cybernetics.de]
[[Discipline:Molecular genetics]]
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[[de:Regelkreis]]
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[[Specialty:Molecular genetics]]

Latest revision as of 19:19, 18 May 2016

Synonyms: control circuit, control loop, closed-loop control, feedback interaction
German: Regelkreis

1 Definition

Information processing structures consisting in a control process with inclosed degenerative feedback are referred to as feedback control system. Feedback control thus permits that vitally important parameters of body function like osmolality, pH and Oxygen-tension as well as plasma level of hormones and body temperature remain constant or in a compliant range.

2 Example

Example of a 0th order linear feedback control system with load:

http://flexicon.doccheck.com/upload/d/d9/Regelkreis.gif

e(t) = x(t) - yR(t)

yS(t) = V1 e(t) = V1 [x(t) - yR(t)]

y(t) = yS(t) + z(t) = V1 [x(t) - yR(t)] + z(t)

yR(t) = V2 y(t)

y(t) = V1 x(t) - V1 V2 y(t) + z(t)

y = [V1 x + z] / [1 + V1 V2]

x: set point, e: error, y: controlled variable, yS: manipulated variable, yR: measured variable, z: load, disturbance variable, V1: amplification factor of direct branch, V2: amplification factor of feedback path.

3 Physiology

The physiological principle of feed-back control is that a controlled variable (f.e. pH, temprature, etc) is monitored by a sensor all the time. The sensor which is manly represented by an enzyme send the input to a comparator. The comparator compares the value to a set point. In the case of differences between the set point and the value sended by the sensor the comparator will send a signal to an effector which will in turn bring the value back to normality.

Feedback control systems play essential roles in the organism. Examples are:

4 Background

Physiological systems theory, a subsection of medical cybernetics deals with mathematical description and analysis of feedback control systems and other information processing structures.

5 External Link

Specialties: Molecular genetics

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