Damage assessment via modal data with a mixed particle swarm strategy, ray optimizer, and harmony search

A mixed particle swarm-ray optimization together with harmony search (HRPSO) is applied to detect damage in structures. In fact, PSO acts as the main engine of the algorithm, RO boost the movement vector of the particles, and HS is used to enhance the local search for better exploitation. The objective functions for damage detection are based on modal characteristics in both frame and truss. In addition, a hybrid double stage approach incorporates the advantages of both modal parameters and Modified Total Modal Assurance Criterion has been used. Numerical analysis is performed for skeletal structures under different damage scenarios with incomplete data. The results have shown the efficiency of the hybrid objective function in identifying damage by using HRPSO.