A History of Control Engineering 1800-1930 by Stuart Bennett

By Stuart Bennett

Dr. Bennett lines the becoming wisdom of the significance and the importance of the concept 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 keep an eye on of ships and airplane.

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E. 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.

This alone would have been a rather crude system with a slow response, much inferior to the ordinary centrifugal governor; the purpose of the regulator, however, was not to control speed per se, but the output voltage of the generator. To achieve this, a pipe was connected to the vacuum side of the diaphragm and taken across the turbine so that its open end was above the dynamo. In front of the open end was a springloaded baffle pivoted so that changes in the magnetic field of the generator either closed the baffle with increasing voltage, thus increasing the vacuum and closing the throttle valve, or, with decreasing voltage, opened the baffle and consequently the throttle valve.

Soc, 1876, 24, p. 262. Thomsons brother, Lord Kelvin, used this type of integrator to build a harmonic analyser (THOMSON, W. [Lord Kelvin]: 4Harmonic analyzer', Proc. Roy. Soc, 1878, 27, pp. 371-373) which was put to use as a tide analyser. : 'Mechanical integration of linear equations of the second order with variable coefficients', Proc. Roy. Soc, 1876, 24, p. 269) MAYR: Notes & Records, pp. 205-228 SIEMENS, C. : op. , 1853, pp. 75-87, pi. : 'On uniform rotation', Trans. Roy. Soc, 1866, 156, pp.

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