Issue 62

P. Ghannadi et alii, Frattura ed Integrità Strutturale, 62 (2022) 460-489; DOI: 10.3221/IGF-ESIS.62.32

incomplete measurements, DOFs were reduced by the Guyan's method in FEM. Then, the damage detection problem was solved through the inverse analysis procedure established by PSO and the reduced model.

Plane frame

The experimental and numerical results are encouraging, and the proposed methodology can be applied to full scale structures.

2015 To bypass the noise effect and to achieve accurate detection, a new method was developed on MSEBI in the wavelet domain and an optimization-based model updating mechanism through PSO.

As a first assessment, the MSEBI in the wavelet domain is considered for detecting the damaged locations. Then, the severity and location of the damages are accurately determined during the optimization procedure through the minimization of the objective function with the modal curvature components. To form the objective function, modal characteristics such as mode shapes and natural frequencies are utilized. Through two-step procedure, the damaged members and the severities of these damages are recognized by MSEBI and the minimization of the objective function with mode shape components, respectively. It should be noted that the optimization algorithm is the PSO–NM. The damaged members are primarily located with the assistance of MSEBI. The extent of the damage is evaluated during its second phase by minimizing 1-MAC through the improved PSO–NM algorithm. An objective function only with frequency components is formulated. PSO and GA are initially applied to minimize the objective function and a

Pal and Banerjee [101]

Kaveh and Maniat [102]

2015 Each optimization problem has some local optimums.

Planar truss Space truss Plane frame Multi-span beams

The MCSS has a greater exploration capacity in finding the global optimum. Therefore, MCSS provides robust and efficient results for damage detection problems even when incomplete dynamic characteristics are contaminated by a certain level of noise. The presented method is not only able to determine the location of the damages, but it is also robust to noise and precisely quantifies the damage severity. The used techniques can determine the damage site and its severity in multiple and single damage scenarios. This method also has high tolerance against noisy inputs.

Therefore, seeking the global optimum encounters difficulties. This study makes a comparison between PSO and the magnetic charged system search (MCSS) to search for the global optimum in the damage detection problems.

Simply supported beam

Chen and Yu [103]

2015 This study proposes an intelligent two-step approach combining PSO, NM algorithm, and MSEBI to establish an adequate balance between accuracy and computational cost.

Plane frame

Chen and Yu [104]

2015 In this study, an improved version of the PSO–NM algorithm is introduced to solve the damage evaluation problems with a low computational cost through the two-step methodology. 2015 This study compares PSO and GA for damage detection in beam-like structures reduced by the proper orthogonal decomposition (POD) method with radial basis function (RBF).

Composite beams The results of the comparison between GA and PSO show a better performance of PSO in terms of accuracy and

Khatir et al. [105]

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