Stabilized Solution to Spurious Mode Problem and Ill-Conditioning in Interface Force Based Substructure Coupling Method

Table 1

The mode frequency comparison in different methods /Hz.

Order	Exact	DCB		DCB+Guyan
		-3		26.4556i	62.1508i
-2		22.8070i	55.1870i
-1		20.6766i	45.5169i
1	0.0000	0.0000	0.0000	0.0000	0.0000
2	6.5712	6.5984	6.5715	6.5740	6.5712
3	7.0001	7.0626	7.0007	7.0331	7.0001
4	7.6090	7.7488	7.6098	7.6828	7.6090
5	12.8444	-	12.8509	-	12.8445
6	18.7891	19.6764	18.8169	18.1328	18.7894
7	27.0282		28.3200		27.0636
8	32.0634		47.2122		32.0652
9	33.1482		-		33.6621
10	35.4645		55.3266