Vibration Analysis of Thin Plate Structures Subjected to a Moving Force Using Frequency-Domain Spectral Element Method

Table 2

Comparison of the natural frequencies (Hz) of the three-span plate with S-S-S-S supports (Example 4) obtained by the FEM [38], ANSYS [39], and SEM.

Mode number	FEM (nE, nD)			ANSYS (nE, nn)	SEM (nE, nD)
	nE = 40 × 10, nD = 1265	nE = 120 × 30, nD = 11005	nE = 480 × 120, nD = 173635	nE = 400 × 100, nn = 40501	nE = 3 × 1, nD = 1584
1	1.268	1.267	1.267	1.267	1.267
2	3.013	3.008	3.007	3.007	3.007
3	3.019	3.018	3.018	3.018	3.018
4	3.471	3.465	3.465	3.465	3.465
5	4.595	4.594	4.594	4.594	4.594
6	4.814	4.813	4.813	4.813	4.813
7	5.026	5.017	5.016	5.016	5.016
8	7.347	7.345	7.345	7.345	7.345
9	9.388	9.362	9.359	9.359	9.359
10	9.433	9.481	9.487	9.487	9.487

Note. n_E = total number of finite elements, n_D = total number of DOFs, and n_n = total number of nodes.