Q1. Discuss the causes of vibration and noise in main gearing and describe detrimental effects on machinery and operating personnel. How would you detect the source(s) of this vibration and how might it be reduced to tolerable limits?
Q2. (a) Define the term Torsional Vibration with respect to an engine crankshaft, stating the effect that high levels can have on an engine crankshaft.
(b) Explain how engine deterioration influences the risk of Torsional Vibration, stating what can be done to minimise that risk.
(c) Explain possible reasons for the activation of a Torsional Vibration alarm after an engine has been started if there had been no previous history of such an alarm and if no maintenance had been undertaken on the engine whilst it was stopped.
Q2. Describe in detail each of the following processes and give an example where each is likely to occur in marine engineering: State how in each case the initiation of the process is prevented or minimized. A. Corrosion fatigue; B. Stress corrosion; C. Creeping cracks; D. Casting cracks
Q9. With reference to machinery parts under cyclic loading, describe, with the aid of sketches, the propagation of even the smallest of cracks can lead to total component failure. (16)
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