2.2.1 The
calculations in Vol 2, Pt 5, Ch 3, 2.1 Documentation 2.1.1, taking
account of bearing, oil-film (where applicable) and structural dynamic
stiffnesses, are to investigate the excitation frequencies which may
result in significant amplitudes within the speed range, and are to
indicate relative deflections and bending moments throughout the shafting
system.
2.2.2 The
calculated natural frequencies of the system are to be compared to
both the shaft rotational orders and propeller blade passing frequencies.
Where cardan shafts are fitted, the shaft second rotational orders
are also to be considered.
2.2.3 Requirements
for calculations may be waived upon request provided evidence of satisfactory
service experience of similar dynamic installations is submitted.