Damage identification method of carbon fiber reinforced polymer structure based on ReliefF and LSSVM

The damage identification method of carbon fiber reinforced polymer structure is of great significance for the timely detection of structural invisible damage and the avoidance of catastrophic consequences. The damage identification method of composite materials based on ReliefF and LSSVM was researched in this paper. Firstly, the damage signals of composite structure were obtained by using non damage active excitation method. Then, Fourier transform is used to extract the damage feature and reduce the feature dimension by ReliefF. On the basis of this, the damage identification model based on LSSVM was established by taking the damage feature as input and the damage mode as output. The experimental results showed that for the 20 test, the correct recognition time was 19 times, which showed higher damage identification accuracy. This paper provides a feasible method for damage identification of composite structures.