Class 2 (2nd Engineer) MEKM 📅 Aug 2018

Exam Question

Enumerate the causes of vibration in diesel machinery and shafting. Describe procedures by which it may be reduced by operating personnel, suitable design and devices. State the possible effects of vibration on machinery and crew members.

Reference Answer

(a) Causes of Vibration in diesel machinery shafting:
Unbalanced forces, moments generated by Reciprocating and Rotating masses are primary contributors.
Constantly Changing Firing Pressures in cylinder lead to fluctuating forces, causing vibration.
Gas forces , including exhaust gas pulsations, create periodic oscillations in the machinery

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