RESEARCH ON DAMAGE IDENTIFICATION ALGORITHM AND EFFICIENCY VERIFICATION WITH STRUCTURAL FREQUENCY

摘要

Testing and analysis technology based on vibration mode is a common method to structural health monitoring and checking. This paper deduces the damage factor used for structural damage evaluation based on test frequency of structure, makes a finite element numerical simulation using ANSYS software and model test to a pressure pipe. Here stiffness reduction method is utilized to produce the damage of single-point and multiple-point, damage identification is carried out with a FEM model of redundant pipe. Meanwhile, model experiment system is designed to validate the efficiency of damage factor with cutting-groove to simulate the damage states. Numerical and experimental results show the proposed damage factor is theoretical brevity, simple realization and high-accuracy performance, therefore, has a good usage prospect in the implement of structural damage monitoring and identification.