One-Step FE Model Updating Using Local Correspondence and Mode Shape Orthogonality

Table 1

Results obtained, in terms of natural frequencies, after one-step updating.

Mode	(Hz)	(Hz)	(Hz)
1	7.38	7.22	7.38
2	8.91	8.91	8.91
3	22.79	19.03	22.79
4	44.38	46.15	44.38
5	80.50	80.14	80.50
6	111.52	113.88	111.52
7	141.96	153.68	141.96
8	209.98	212.94	209.98
9	—	274.01	274.01
10	—	274.06	274.06
11	—	515.52	515.52
12	—	526.40	526.40
13	—	560.75	560.75
14	—	589.77	589.77
15	—	705.80	705.80

First column has experimentally determined frequencies. Second column contains frequencies from the original linear system . The third column contains frequencies from the updated linear system . After updating, the frequencies in the upper part of column three coincide with the frequencies in the first experimental column.