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In the presence of frictional resistance, the expression for piston effort is _________

(a) F(L) – F(I)

(b) F(L) + F(I)

(c) F(L) ± F(I) – R(f)

(d) F(L) – F(I) + R(f)

The question was asked during an interview.

This key question is from Forces on the Reciprocating Parts of an Engine Neglecting Weight of the Connecting Rod in division Inertia Forces in Reciprocating Parts of Machine Dynamics

1 Answer

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by (38.6k points)
The correct answer is (c) F(L) ± F(I) – R(f)

Explanation: Piston effort depends on the net piston load and inertia force, in presence of frictional resistance and additional term of R(f) is subtracted from the overall expression.

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