Research on Damage Identification of Beam Structure Based on Dynamics

In this article, the damage identification methods based on structural modes are discussed.According to the curvature modes before and after damage, the traditional structural damage location method based on curvature change is improved, and based on the vibration differential equation of Euler-Bernoulli beam and Perturbation theory established a quantitative identification method for small structural damage.The cantilever aluminum beam model is established by ABAQUS, and different damage conditions are set up.The damage index method (D-index) and the curvature damage factor method (CDF) are used for localization analysis, and the perturbation theory is used to introduce the damage parameter for quantitative analysis.Taking the cantilever aluminum beam as the test object, the Piezoelectric Transducer-Scanning Laser Doppler Vibrometer (PZT-SLDV) modal test system is used to conduct vibration tests to verify the rationality and applicability of the methods, discuss the damage location, damage relationship between parameters.The research shows that the damage location can be accurately identified by the damage index method and the damage factor method, and the small damage severity can be effectively quantified by the damage parameter.