- analog computer
a computer that represents data by measurable quantities, as voltages or, formerly, the rotation of gears, in order to solve a problem, rather than by expressing the data as numbers. Cf. digital computer.[1945-50, Amer.]
* * *Computer in which continuously variable physical quantities, such as electrical potential, fluid pressure, or mechanical motion, are used to represent (analogously) the quantities in the problem to be solved.The analog system is set up according to initial conditions and then allowed to change freely. Answers to the problem are obtained by measuring the variables in the analog model. Analog computers are especially well suited to simulating dynamic systems; such simulations may be conducted in real time or at greatly accelerated rates, allowing experimentation by performing many runs with different variables. They have been widely used in simulating the operation of aircraft, nuclear power plants, and industrial chemical processes. See also digital computer.
* * *any of a class of devices in which continuously variable physical quantities such as electrical potential, fluid pressure, or mechanical motion are represented in a way analogous to the corresponding quantities in the problem to be solved. The analog system is set up according to initial conditions and then allowed to change freely. Answers to the problem are obtained by measuring the variables in the analog model. See also digital computer.The earliest analog computers were special-purpose machines, as for example the tide predictor developed in 1873 by William Thomson (later known as Lord Kelvin (Kelvin, William Thomson, Baron)). Along the same lines, A.A. Michelson (Michelson, A.A.) and S.W. Stratton built in 1898 a harmonic analyzer (harmonic analysis) (q.v.) having 80 components. Each of these was capable of generating a sinusoidal motion, which could be multiplied by constant factors by adjustment of a fulcrum on levers. The components were added by means of springs to produce a resultant. Another milestone in the development of the modern analog computer was the invention of the so-called differential analyzer in the early 1930s by Vannevar Bush (Bush, Vannevar), an American electrical engineer, and his colleagues. This machine, which used mechanical integrators (gears of variable speed) to solve differential equations, was the first practical and reliable device of its kind.Most present-day electronic analog computers operate by manipulating potential differences (voltages). Their basic component is an operational amplifier, a device whose output current is proportional to its input potential difference. By causing this output current to flow through appropriate components, further potential differences are obtained, and a wide variety of mathematical operations, including inversion, summation, differentiation, and integration, can be carried out on them. A typical electronic analog computer consists of numerous types of amplifiers, which can be connected so as to build up a mathematical expression, sometimes of great complexity and with a multitude of variables.Analog computers are especially well suited to simulating dynamic systems; such simulations (simulation) may be conducted in real time or at greatly accelerated rates, thereby allowing experimentation by repeated runs with altered variables. They have been widely used in simulations of aircraft, nuclear-power plants, and industrial chemical processes. Other major uses include analysis of hydraulic networks (e.g., flow of liquids through a sewer system) and electronics networks (e.g., performance of long-distance circuits).
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analog computer — analogue computer analogue computer . a computer that represents information by continuously variable quantities (e.g., positions or voltages). [WordNet 1.5 +PJC] … The Collaborative International Dictionary of English
analog computer — Computer Com*put er (k[o^]m*p[=u]t [ e]r), n. 1. One who computes. 2. (Computers) an electronic device for performing calculations automatically. It consists of a clock to provide voltage pulses to synchronize the operations of the devices within … The Collaborative International Dictionary of English
analog computer — ☆ analog computer n. a computer for processing data represented by a continuous physical variable, as electric current: cf. DIGITAL COMPUTER … English World dictionary
Analog computer — An analog computer (spelt analogue in British English) is a form of computer that uses continuous physical phenomena such as electrical, [Universiteit van Amsterdam Computer Museum, (2007)] mechanical, or hydraulic quantities to model the problem … Wikipedia
Analog-Computer — Analogcomputer oder Analogrechner sind Rechner, die Berechnungen auf der Basis zu den Problemstellungen gleichartig wirkender mechanischer oder elektrischer Vorgänge bzw. Abbildungen durchführen. Bei Analogrechnern wird die Eigenschaft ausgenutzt … Deutsch Wikipedia
analog computer — noun a computer that represents information by variable quantities (e.g., positions or voltages) • Syn: ↑analogue computer • Hypernyms: ↑computer, ↑computing machine, ↑computing device, ↑data processor, ↑elec … Useful english dictionary
analog computer — analoginis skaičiavimo įrenginys statusas T sritis automatika atitikmenys: angl. analog calculator; analog computer vok. Analogrecheneinheit, f; Analogrechner, m rus. аналоговое вычислительное устройство, n; моделирующее вычислительное устройство … Automatikos terminų žodynas
analog computer — analoginis kompiuteris statusas T sritis fizika atitikmenys: angl. analog computer; analogous computer vok. Analogrechner, m rus. аналоговый компьютер, m pranc. ordinateur analogue, m … Fizikos terminų žodynas
analog computer — analoginis kompiuteris statusas T sritis informatika apibrėžtis ↑Kompiuteris, atliekantis skaičiavimus fizinio modeliavimo metodu. Skaičiai išreiškiami fizikiniais dydžiais, pavyzdžiui, elektros srove arba įtampa. Veiksmai atliekami su… … Enciklopedinis kompiuterijos žodynas
analog computer — noun Date: 1948 a computer that operates with numbers represented by directly measurable quantities (as voltages or rotations) compare digital computer, hybrid computer … New Collegiate Dictionary