Research Area:  Metaheuristic Computing
Finite element (FE) based structural health monitoring (SHM) algorithms seek to update structural damage indices through solving an optimisation problem in which the difference between the response of the real structure and a corresponding FE model to some excitation force is minimised. These techniques, therefore, exploit advanced optimisation algorithms to alleviate errors stemming from the lack of information or the use of highly noisy measured responses. This study proposes an effective approach for damage detection by using a recently developed novel swarm intelligence algorithm, i.e. the marine predator algorithm (MPA). In the proposed approach, optimal foraging strategy and marine memory are employed to improve the learning ability of feedforward neural networks. After training, the hybrid feedforward neural networks and marine predator algorithm, MPAFNN, produces the best combination of connection weights and biases. These weights and biases then are re-input to the networks for prediction. Firstly, the classification capability of the proposed algorithm is investigated in comparison with some well-known optimization algorithms such as particle swarm optimization (PSO), gravitational search algorithm (GSA), hybrid particle swarm optimization-gravitational search algorithm (PSOGSA), and grey wolf optimizer (GWO) via four classification benchmark problems. The superior and stable performance of MPAFNN proves its effectiveness. Then, the proposed method is applied for damage identification of three numerical models, i.e. a simply supported beam, a two-span continuous beam, and a laboratory free-free beam by using modal flexibility indices. The obtained results reveal the feasibility of the proposed approach in damage identification not only for different structures with single damage and multiple damage, but also considering noise effect.
Keywords:  
Hybrid approach
Marine predator algorithm-feedforward neural networks (MPAFNN)
Vibration experiment
Damage detection
Modal flexibility index
Author(s) Name:  Long Viet Ho, Duong Huong Nguyen, Mohsen Mousavi, Guido De Roeck, Thanh Bui-Tien, Amir H. Gandomi, Magd Abdel Wahab
Journal name:  Computers & Structures
Conferrence name:  
Publisher name:  Elsevier
DOI:  10.1016/j.compstruc.2021.106568
Volume Information:  Volume 252, August 2021, 106568
Paper Link:   https://www.sciencedirect.com/science/article/abs/pii/S0045794921000900