Task 4: Estimate the equivalent 3 inertias system and analytically calculate its natural frequency values. Use a numerical method (Holzer-Tolle or alternative) to calculate the first 3 natural frequencies of the system and the respective modal shapes).
Task 5: Draw the interference (Campbell) diagram and identify the most dangerous resonances. Consider that the maximum engine speed is 103% of the MCR speed and the lower operating point is at 20% load. Estimate the speed range that has to be barred.
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Task 6: Calculate the additional stress due to torsional vibrations at the most dangerous resonances and compare with the permissible limits provided by the Classification Societies. Compare the following cases (a) firing of all cylinders, (b) misfire of cylinder 5.
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