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ANALOG-DIGITAL COMPUTERS FOR REAL-TIME SIMULATION
MASSACHUSETTS INST OF TECH CAMBRIDGE ELECTRONIC SYSTEMS LAB
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The relative advantages of analog and digital computational techniques as applied to he problem of real-tim aircraft simulation are discussed. T HE HYPOTHESIS IS PRESENT D THAT A BASIC DIGITAL COMPUTER IS FEASIBLE TODAY THAT WOULD COMPETE WITH ANALOG TECHNIQUES ON BOTH COST AND ABILITY TO SIMULATE NATURAL AIRCRAFT FREQUENCIES IN REAL TIME. It is possible that the digital or hybrid computer will supplant the analog computer in those problem classes requiring more than 100 amplifiers. The concept of high-spe time-shared analog computing elements opera ing under the control of a digital computer is introduced. A family of such elements is described as well as various system design studies and experimental demonstration systems. The design of an analog-digital computer utilizing the pulsed-analog concept is outlined. The advantages and disadvantages of floating-point arithmetic are discussed. Illustrative programs are presented for function generation, trigonometric resolution, and the solution of a typical aerodynamic equation. It is concluded that the use of peripheral pulsed-analog equipment would increase the effectiv computing speed of a given digital computer on simulation problems by a factor of two or more. Author
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