Research Article

Complete Inverse Method Using Ant Colony Optimization Algorithm for Structural Parameters and Excitation Identification from Output Only Measurements

Table 4

Identified results with noise-pollution measurements.

Case 1Case 2Case 3Case 4
Parameters and its real values(Noise = 1%)(Noise = 5%)(Noise = 10%)(Noise = 15%)
Error (%) Error (%) Error (%) Error (%)

271390271212−0.07270655−0.27267110−1.58251259−7.42
290360290206−0.05288793−0.54288103−0.78273108−5.94
2826902828770.07281526−0.41278466−1.49276999−2.01
252480252271−0.08252238−0.10249497−1.18246445−2.39
2335402336050.03232816−0.31230917−1.12229261−1.83
229940229767−0.08229776−0.072304180.21222248−3.35
2469.652451.16−0.752484.770.612061.82−16.511591.87−35.54
2874.562878.740.152865.31−0.323047.326.013293.6514.58
2572.482564.28−0.322601.611.132124.07−17.432192.95−14.75
2297.572297.05−0.022273.31−1.062468.877.462490.998.42
2265.332266.120.032246.78−0.822231.8−1.482191.78−3.25
2092.452095.250.132107.040.702134.342.002038.22−2.59
200300200300

For all cases, identical initial values range [1, ] is used for all stiffness and damping parameters; : identified parameter vector; Error: relative error, : number of sampling points used.