Download A History of Control Engineering 1800-1930 by Stuart Bennett PDF

By Stuart Bennett

ISBN-10: 0863410472

ISBN-13: 9780863410475

Dr. Bennett strains the transforming into expertise of the significance and the importance of the idea that of suggestions in engineering and treats intimately the technical advancements that contributed to this knowledge. There follows an account of the improvement of steam and hydraulic servomechanisms and their program to the regulate of ships and plane.

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These governors are normally located within the fly wheel and employ two or more centrifugal weights arranged symmetrically and balanced by springs. The movement of the weights * Shown in Fig. 16b. 36 The regulation of prime movers is linked to the eccentric which operates the cut-off point in such a way that when the speed increases the throw of the eccentric is reduced and earlier cut-off is obtained. Fig. 15 Pickering's spring-loaded governor [Reprinted by permission of the Smithsonian Institution Press from Feedback mechanisms, 0 .

Unstable. To control the oscillation they tried first a simple friction brake, and, in 1864, an air dashpot. Other engineers had similar stability problems with isochronous governors. In 1871 an English engineer, J. Head, wrote of one such Jean Joseph Leon Farcot is remembered not for his work on governors, but as the author of the first book on servo mechanisms, published in 1873 (see chapter 4). 26 Fig. 10 The regulation of prime movers Parabolic governor with air damper, 187f [Reprinted by permission of the Council of the Institution of Mechanical Engineers from Proc.

Steam-turbine regulation Charles A. Parsons used an unusual method of regulation for his early steam turbines (Fig. 19). The speed-sensing device, a centrifugal fan, creates, on its suction side, a vacuum which is considered to be proportional to the turbine speed. The vacuum pressure acts on one side Fig. 19 Parson's steam-turbine governor, 1888 [Reprinted by permission of the Council of the Institution of Mechanical Engineers from Proc. I Mech. (;"* Kir i'rr li an . The regulation of prime movers 43 of a loaded diaphragm which is connected to the throttle valve, so that, if the vacuum increases, the valve is closed.

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A History of Control Engineering 1800-1930 by Stuart Bennett


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