Time domain analysis is a systems theoretic method that describes the relation between structure and behaviour of a system, e.g. a processing structure, with respect to its evolution in time.

Basic Concepts Edit

In time domain, the description of a system has to account for both amplitude and time course of a signal. Standard test signals that are suitable for this task include Dirac's impulse and heaviside function. The system's response to an impulse is modelled by means of Duhamel's concolution integral.

Standard Quantities Edit

Characteristic indicators describing the time response of the system cover the following standard quantities:

  1. The rise time tr is the time it takes the system to reach the civinity of its new equilibrium point.
  1. The settling time ts is the time it takes the system transients to decay.
  1. The overshoot Mp is the maximum account the system overshoots its vinal value divided by its final value (often expressed as percentage).
  1. The peak time tp is the time it takes the system to reach the maximum overshoot point.

Example Edit

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

0th order feedback control

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

yS(t) = G1 e(t) = G1 [x(t) - yR(t)]

y(t) = yS(t) + z(t) = G1 [x(t) - yR(t)] + z(t)

yR(t) = G2 y(t)

y(t) = G1 x(t) - G1 G2 y(t) + z(t)

y = G1x + z / (1 + G1 G2)

x: set point, e: error, y: controlled variable, yS: manipulated variable, yR: measured variable, z: load, disturbance variable, G1: amplification factor of direct branch, G2: amplification factor of feedback path.

See the legend for an explanation of symbols.

References Edit

  1. Bateson RN. Introduction to control system technology. Upper Saddle River, NJ: Prentice Hall, 1996. ISBN 0132262754
  2. Cruse H. Biologische Kybernetik. In: Nachtigall W, ed. studium biologie. Weinheim, Deerfield Beach (Fl.), Basel: Verlag Chemie, 1981. ISBN 3527259112
  3. Franklin GF, Powell JD, Emami-Naeini A. Feedback Control of Dynamic Systems. Delhi: Pearson Education, 2002. ISBN 8178086751
  4. Röhler R. Biologische Kybernetik. In: Stieve H, Hildebrand E, eds. Studienbücher der Biologie. Stuttgart: B. G. Teubner, 1973. ISBN 3519036029
  5. Varjú D. Systemtheorie für Biologen und Mediziner. Heidelberger Taschenbücher. Vol. 182. Berlin, Heidelberg, New York: Springer, 1977. ISBN 3540080864

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