A new crack diagnosis method on box structure based on empirical mode decomposition

摘要

A new crack diagnosis method on a two-story box structure based on empirical mode decomposition is proposed in this paper.According to the simulation analysis, it turns out that the model of the structure can be barely influenced by the crack.Response signals of swept sine vibration test are empirical mode decomposed into a set of intrinsic mode functions, from which tag vectors are constructed, then tag angles are defined to dignose the failure of the board.Combined with the load direction to the structure, the position and direction of the crack can be deduced using tag angles.