Numerical Research on Damage Detection of Simple Supported Beam Based on the Natural Frequency Vector Method

The natural frequency vector method for damage identification was inferred theoretically, on the basis of the natural frequency vector and its assurance criterion. Take the simple supported beam as an example to carry out numerical research: used the modified dynamic model and the method of rigidity reduce to simulate the damage at different degrees and different positions, calculated the damage structure sequence natural frequency, and formed the natural frequency vector damage features database; and then simulated 3 conditions, calculated and compared the natural frequency vector between different conditions and the damage features database, so that the damage position and degree could be detected. The result showed that this method can distinguish the damage position and degree accurately.