Research on modal parameters identification of wing structures with NExT-ERA

To the aircraft structures system, there are lots of factors which will lead to the inevitable performance degradation or faults, such as the corrosion of the external environment, the fatigue causing by the varying loads, degradation of material properties and so on. Based on the monitoring parameters of the structures, Structural Health Monitoring (SHM) technique can comprehensively assess the status of the structure and its damage. All results of SHM are useful to extend the structural life, reduce maintenance costs and improve the safety and reliability of the structure. In this paper, taking a wing structure as example, the acceleration responses under the natural excitation can be obtained. With NExT-ERA method, the modal parameters of the wing structure can be calculated. Comparing with the finite element results, the numerical results of NExT-ERA method can be proved that they are credible and accurate. All the results indicate that, without destroying the structure situation, the NExT- ERA method can accurately identify the wing structure modal parameters.