The secondary unbalanced force produced by the reciprocating parts of a certain cylinder of a given engine with crank radius r and connecting rod length l can be considered as equal to primary unbalanced force produced by the same weight having

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The secondary unbalanced force produced by the reciprocating parts of a certain cylinder of a given engine with crank radius r and connecting rod length l can be considered as equal to primary unbalanced force produced by the same weight having

asked Sep 23, 2022 in Machine Dynamics by Grayson (34.3k points)

The secondary unbalanced force produced by the reciprocating parts of a certain cylinder of a given engine with crank radius r and connecting rod length l can be considered as equal to primary unbalanced force produced by the same weight having

(a) an equivalent crank radius r^2/4l and rotating at twice the speed of the engine

(b) r^2/4l as equivalent crank radius and rotating at engine speed

(c) equivalent crank length of r^2/4l and rotating at engine speed

(d) none of the mentioned

The question was asked in a dream while sleeping

The doubt is from Balancing of Several Masses Rotating in the Same Plane topic in division Balancing of Rotating Masses of Machine Dynamics

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Fred · Answer 1 · 2022-10-16T20:19:34+0000

Right answer is (a) an equivalent crank radius r^2/4l and rotating at twice the speed of the engine

The explanation is: We know that secondary force = primary force

FS = FP

Therefore, to balance the force the primary force should contain an equivalent crank radius r^2/4l and rotating at twice the speed of the engine.

The secondary unbalanced force produced by the reciprocating parts of a certain cylinder of a given engine with crank radius r and connecting rod length l can be considered as equal to primary unbalanced force produced by the same weight having

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