Abstract
Purpose
This work designs a procedure for structural damage assessment in beams under moving loads. The proposal is based on the respective alterations of hybrid vibrational factors with respect to the structural changes, whereby matching them for accurate predictions. These hybrid factors are extracted from the vibrational responses and then are employed for an artificial neural network (ANN) to assess the structural condition.
Methods
An experiment is deployed to generate a databank for evaluation as well as ANN training. The maximal overlap discrete wavelet transform (MODWT) and the fast Fourier transform (FFT) are incorporated to split original signals into several power bands, which helps to exploit characteristics of individual vibrational modes: centroids and comparative powers of allocated spectra. The extracted hybrid factors are then fed into an ANN to predict the damage condition of the beam. The training process of this ANN uses a databank of extracted features from measured signals.
Results
The paper successfully finds out the damage-sensitive feature through signal processing. Alternatively, the implemented experiment provides a rich databank for the ANN training, and the training performance reaches a high accuracy. Moreover, the testing results reveal the superior generalization of the ANN because of automatic predictions with high precision. This proves the contribution of the study that the exploited features are proper for structural assessment, and the trained ANN learns the correlation of vibration features and structural state well.
Conclusions
The automation and effectiveness of the proposed approach are endorsed, which has high applicability and accuracy for damage assessment in beams. The proposed method is mainly devoted to identifying, quantifying, and localizing damage.
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Acknowledgements
We acknowledge Ho Chi Minh City University of Technology (HCMUT), VNU-HCM, for supporting this study.
Funding
This research is funded by Vietnam National University Ho Chi Minh City (VNU-HCM) under grant number C2021-20-05.
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Nguyen-Nhat, T., Vuong-Cong, L., Le-Ngoc, V. et al. Inspecting Spectral Centroid and Relative Power of Allocated Spectra Using Artificial Neural Network for Damage Diagnosis in Beam Structures Under Moving Loads. J. Vib. Eng. Technol. 12, 4617–4635 (2024). https://doi.org/10.1007/s42417-023-01140-y
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DOI: https://doi.org/10.1007/s42417-023-01140-y