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MEO Class II – EK-Motor : 2011/FEB/08 – 2011/JUN/06 – 2014/MAR/01 – 2015/JUN/02 – 2015/JUL/07 – 2017/JUN/02 – 2017/NOV/01

Q1. With reference to torsional vibrations in a main propulsion installation based on medium speed engines, gearbox and controllable pitch propeller: Explain how the vibrations may be caused; State the possible effects and damage that could result; Discuss the methods employed to minimise the potential problems associate with torsional vibration; Describe how the natural vibration frequency of the system could be modified.

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