Vibration Characteristics and Power Flow Analyses of a Ship Propulsion Shafting System with General Support and Thrust Loading

Table 4

The first ten natural frequencies of original model compared with models A and B under F-C boundary conditions.

Mode order	Original model	Model A		Model B
	Value	Value	Diff (%)	Value	Diff (%)
1	15.38	15.38	0	15.434	0.345
2	38.491	38.007	1.257	37.710	2.030
3	60.027	60.003	0.039	59.899	0.213
4	94.812	95.937	1.179	96.929	2.225
5	124.975	125.33	0.286	126.618	1.317
6	158.209	158.825	0.386	158.959	0.470
7	227.067	229.819	1.203	229.790	1.190
8	298.02	299.124	0.37	298.099	0.042
9	386.861	392.192	1.377	390.734	1.000
10	474.613	475.743	0.236	475.303	0.143 s