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ADIABATIC PROCESS

A thermo-dynamic process in which no heat is extracted from or added to the system of the process.

Related Terms

GEARBOX

A system of gears which alter the ratio between the revolution of the engine and the propeller shaft so the propeller operates in a relatively efficient speed range. By using a gearbox the engine and the propeller shaft will revolve at different speeds.

DISTORTION

  1. Any undesired change in the waveform of an electric signal passing through a circuit or other transmission medium.
  2. In general, the extent to which a system fails to accurately reproduce the characteristics of an input signal at its output.
  3. Any undesired change in the waveform of a sound wave.

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.

POLE-POSITIONING

A design technique used in linear control theory in which many or all of a system's closed-loop poles are positioned as required, by proper choice of a linear state feedback law; if the system is controllable, all of the closed-loop poles can be arbitrarily positioned by this technique.

PNEUMATIC WEIGHING SYSTEM

A system for weight measurement in which the load is detected by a nozzle and balanced by modulating the air pressure in an opposing capsule.

PLENUM SYSTEM

A heating or air conditioning system in which air is forced through a plenum chamber for distribution to ducts.

PLANT DECOMPOSITION

The partitioning of a large-scale control system into subsystems along lines of weak interaction.

PIECEWISE LINEAR SYSTEM

A system for which one can divide the range of values of input quantities into a finite number of intervals such that the output quantity is a linear function of the input quantity within each of these intervals.

PHOTOELECTRICLOOPCONTROL

[CONTSYS] Aphotoelectric control system used as a position regulator for a loop of material passing from one stripprocessing line to another that may travel at a different speed. Also known as loop control.

PHOTOELECTRIC SORTER

A photoelectric control system used to sort objects according to color, size, shape, or other light-changing characteristics.

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