By Stuart Bennett
Dr. Bennett strains the transforming into wisdom 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 advance of steam and hydraulic servomechanisms and their program to the keep watch over of ships and airplane.
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Extra info for A History of Control Engineering 1800-1930
Washington, DC: Smithsonian Institution Press, 1971 ] 3 o (ft I* §• o CD 5 The regulation of prime movers 45 this time, improvements in gear cutting had reduced another source of vibration. Gust governing was implemented in several ways: in some cases the duration of the gust was directly controlled by the regulator, in others the gust action was simply obtained by superimposing motion derived from an eccentric on the normally regulated setting of the throttle valve. A turbine of the latter type is shown in Fig.
1859, pp. 92-95, pi. 23 BELL, R. : Discussion,Proc. ICE 1877-1878,51, p. 34 The Engineer, 1859, 8, pp. 95,155 MAYR: Feedback mechanisms, pp. ,p. 19 The regulation of prime movers 49 73 BALL, F. : 'Steam engine governors*, Trans. ASMEt 1897,18, p. 291 74 THOMPSON, S. : Dynamo-electric machinery: a manual for students of electrotechnks (E. & F. N. Spon, London, 1892), p. : 'Governors with load sensing', Proc. , 1971,184, Pt. 1, pp. 161-180 76 See MAYR: Feedback mechanisms, pp. 13-16, and PORTER, C.
They will vary their velocity in concert with the engine, without acting upon the valve, until after the engine has altered its speed sufficiently to impart so much centrifugal power to the balls, as will cause them to overcome the resistances. 40 Here, clearly, is the recognition that frictional forces in the throttle valve and linkages could give rise to 'hunting'. In contrast, the chronometric governor responded quickly to changes in engine speed, as Werner Siemens explained: With the centrifugal governor an acceleration of the speed of the engine by one-twentieth of a revolution cannot be indicated, because the centrifugal force of the balls is not sufficiently increased by this slight increase in the velocity of revolution to overcome the resistance opposed to their flying out.
A History of Control Engineering 1800-1930 by Stuart Bennett