Fluidics

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Fluidics (fluidic logic) is the use of fluid mechanical components for signal processing in automation technology . It is based on the principles of fluid mechanics and uses pneumatic or hydraulic auxiliary energy.

Fluid mechanical components work with the help of liquid or compressible media, such as. B. air, water or hydraulic fluids . The proportion of hydraulic controls plays only a minor role here. They are - also combined to form integrated circuits - used in both analog and digital circuits.

Fluidic systems were developed in the 1960s and replaced by microelectronics in the 1970s . So-called dynamic fluidic systems (see below) are currently still used for a few special tasks.

species

There are two types of fluidic systems:

Static fluidic systems

Movable pistons, flaps, slides or membranes switch the signals. Auxiliary energy is only consumed when switching - the fluid is mostly static.

Executions:

  • UNALOG (universal low-pressure analog and logic system)
  • DRELOBA binary control system
  • SAMSOMATIK
  • USEPPA
Wall jet flip-flop based on HOERBIGER Pneumonic
Fluidic AND according to HOERBIGER Pneumonic

Dynamic fluidic systems

There are no moving parts and therefore no mechanical wear. Auxiliary energy is constantly consumed - the fluid has to move in order to keep it working.

Versions of fluid mechanical switching elements:

Manufacturing

The channels of fluid mechanical switching elements are usually etched or pressed in plastic .

advantages and disadvantages

Fluid mechanical switching elements are characterized by a lack of wear, reliability and insensitivity to heat , ionizing radiation and vibration .

A disadvantage is the slowness (relatively long switching times, relatively low frequencies ).

Applications

The fluidics is u. a. in the air and space , in the military equipment came in industrial controls, medicine and even in devices for everyday use for the application.

swell

  • Stanley W. Angrist: Fluid control devices. In: Scientific American , December 1964, pp. 80-88. [1]
  • A. Böge: The technician manual. 11th edition. F. Vieweg & Sohn, Braunschweig a. Wiesbaden 1989, pp. 1517-1530.
  • Hans Ebertshäuser u. Siegfried Helduser: Fluid technology from A to Z. United specialist publishers, Mainz 1995. ISBN 3-78-300286-9
  • James W. Joyce: Fluidics. Basic components and applications. Maryland 1983. ( PDF )

further reading

  • Gerhart Kriechbaum: Pneumatic controls , Vieweg, 1997. ISBN 9783528140571
  • Thomas Krist: hydraulics, pneumatics, fluidics - pneumatic logic: formulas, data, terms; for vocational training, studies and practice. 4th edition Hoppenstedt, Darmstadt 1991.
  • Adolf W. Rechten: Fluidics: Fundamentals, components, circuits. Springer, Berlin 1976.
  • Günter Ortmann: Logic and fluidics controls: a reference work for terms, symbols, devices and circuits in control technology in general as well as fluidics technology and its peripheral areas. Ortmann, Hilden 1973.
  • Eduard Karg: Fluidics: in a nutshell. Elementary introduction to the technology of pneumatic logic elements. Vogel, Würzburg 1972.
  • László Helm et al .: Introduction to Fluidics: Pneumatic Logical Elements and Systems. Oldenbourg, Munich 1971.
  • O.Lew wood: Pure Fluid Device . In: Machine Design . June 1964, pp. 154-180.
  • EFTarumoto DHHumphrey: Fluidics . Fluid Amplifier Associates, Inc, 1965.
  • RE.Bowles EM.Dexter: A Second Generation of Fluid System Application . Fluid Amplification Symposium, October 1965, p. 213 .

Web link

Pneumatic logic elements from 1969

See also