Class 2 (2nd Engineer) MEKM 📅 Jan 2021

Exam Question

Discuss the nature of the forces to which a main engine crankshaft is subjected in normal service and explain how the resulting stress are maintained at a safe limit by design and efficient maintenance respectively. Indicate the circumstances under which the crankshaft may

(a) Be over-stressed

(b) Become defective without being over-stressed.

Reference Answer

Forces Acting on a Crankshaft in Normal Service
Inertia Forces :
These forces act on both the rotating and reciprocating masses of the engine.
For rotating masses, the inertia forces are constant in magnitude but change direction with rotation.

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