By Stuart Bennett
Dr. Bennett strains the becoming understanding 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 airplane.
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Additional info for A History of Control Engineering 1800-1930
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. 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.
The benefits of this method of control had been recognised early in the century, and many engines were fitted with valve gear which enabled the cut-off point to be changed manually. In 1834 Zachariah Allen proposed the use of the Watt governor to modify the cut-off point, and similar proposals were made by Horatio Allen, J. J. Meyer and F. E. Sickels, all in 1841. Corliss in 1848 and patented in 1849. 88 This mechanism used * The Capacity' of a governor is a measure of the effort or work (average force X distance moved) which can be obtained from it in response to a change of speed.
Both the Hunt and Woodward governors had a major defect in that they provided only integral action and hence the output was proportional to the time integral of the speed deviation. The governor had thus a slow response and was prone to instability. This meant that they were only suited for applications where load changes were infrequent. To correct these deflciences, the Woodward Company developed a 'compensating' governor in 1901; compensation was achieved by adding a minor feedback loop (Fig.
A History of Control Engineering 1800-1930 by Stuart Bennett