关键词: 残余系数, 导波, 基本模式分量, 无损检测, 圆柱结构

Abstract: A cylindrical model is proposed and a corresponding damage identification method is promoted to realize the nondestructive evaluation of revolving cylindrical structure using guided waves. Reflection coefficient and residual coefficient of the captured longitudinal wave in the proposed cylindrical model are defined and calibrated corresponding to different damage cases based on dynamic finite element analysis. Simulation results demonstrate that the residual coefficient can be utilized to interpret different damage cases. The promoted damage identification method is validated experimentally. A circular thin aluminum plate with two central circular piezoelectric transducers(PZTs) is used to model a radial slice of the proposed cylindrical model. The first intrinsic mode functions(IMFs), extracted from the captured wave signals as signal features, are compared between the benchmark (without damage) and damage case(with damage) to calibrate the residual coefficient of the fundamental symmetrical (S0) mode. Experimental results consist with the simulation results, indicating the efficiency of the promoted damage identification method and building foundation for the future research about detecting revolving cylindrical structure.

Key words: Cylindrical structure, Guided waves, Intrinsic mode function, Nondestructive evaluation, Residual coefficient