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

Table 5

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

Mode order	Original model	Model C		Model D
	Value	Value	Diff (%)	Value	Diff (%)
1	15.38	14.132	8.114	15.726	2.248
2	38.491	41.681	8.288	41.477	7.757
3	60.027	65.250	8.702	62.700	4.453
4	94.812	99.720	5.168	99.945	5.405
5	124.975	129.698	3.782	129.216	3.396
6	158.209	159.668	0.918	160.211	1.262
7	227.067	227.651	0.248	228.222	0.500
8	298.02	301.183	1.077	302.002	1.352
9	386.861	386.296	0.148	386.636	0.060
10	474.613	471.945	0.565	471.788	0.598