Damage Detection of Complex Surface Structures Based on Curvature Modes

Complex surface structures are widely used in engineering, and non-destructive testing of surface structures is of great significance. In this paper, the valve of the aero engine is taken as the research object, and the curvature mode difference (DI) is introduced as the damage parameter. The valve was processed to different degrees of cracks, the laser vibrometer was used to obtain the modal mode shape before and after the valve damage, and the central difference method was applied to solve the curvature mode value before and after structural damage, and the crack was located by using its difference, and then the damage degree was determined. The results show that the damage recognition of the structure by the modal curvature difference method can accurately deter-孙海航，吴锦武