. The steam-engine and other heat-motors. entric-rodduring a revolution. This operation is not performed in thetext. We can then write: Constant centrifugal moment = constant spring moment i-themean moment of the eccentric-rod forces. SPEED VARIATIOX CONTROL. 397 To Find the Weight of the Bar to Absorb Unbalanced Work.—The second part of the analysis is devoted to a discussion of amethod of finding the weight of the bar to absorb excess ordeficit of work caused by the unbalanced pressure in the eccentric-rod and by the weight of the rotating parts. As work is theproduct of a mean pressure and
. The steam-engine and other heat-motors. entric-rodduring a revolution. This operation is not performed in thetext. We can then write: Constant centrifugal moment = constant spring moment i-themean moment of the eccentric-rod forces. SPEED VARIATIOX CONTROL. 397 To Find the Weight of the Bar to Absorb Unbalanced Work.—The second part of the analysis is devoted to a discussion of amethod of finding the weight of the bar to absorb excess ordeficit of work caused by the unbalanced pressure in the eccentric-rod and by the weight of the rotating parts. As work is theproduct of a mean pressure and the distance through which thatmean pressure is exerted, it remains to show the distance throughwhich the force in the eccentric-rod and the weight of the rotatingparts is exerted. Work of Eccentric-rod Forces about the Spindle Axis.—Refer-ring to Fig. 216, we see that if ab\ is the pressure in the eccentric-rod when the eccentric is at a\ then the turning effort of thepressure, ab\ (about the spindle 61), is equal to that of a force. Fig. 217. Fig. 218. no acting normally to a radius, a\b\. Note that the forces andtheir normal components in the figure are drawn at the spindlecenters instead of the eccentric centers to avoid confusion oflines. By taking all the pressures normal to the line joining theeccentric and spindle centers, it is evident that the mean normalpressure multiplied by the circumference of a circle whose radiusis a\bi would represent the work done by the resultant eccentric-rod pressure during a revolution. In Fig. 218 the line, ef, repre-sents 2naibi and the ordinates of the full line curve marked aCrepresent pressures in the eccentric-rod resolved normally tothe lines joining the eccentric and spindle centers. The areabetween the curve aC and the base 0 — 360° represents the of Rotating Weights about the Spindle Axis. — Therotating weights are constant in weight, are concentrated at G, 398 THE STEAM-ENGINE AND OTHER HEAT-MOTORS. and have v
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