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基于曲率模态的复杂曲面结构损伤检测
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Abstract:
复杂曲面结构在工程中被广泛应用，对曲面结构进行无损检测具有重要意义。本文以航空发动机的活门为研究对象，引入曲率模态差(DI)作为损伤参数。对活门进行不同程度裂纹加工，利用激光测振仪获得活门损伤前后的模态振型，应用中心差分法求解结构损伤前后的曲率模态值，利用其差值对裂纹进行定位,进而确定损伤程度。研究结果表明，采用模态曲率差法对结构进行损伤识别能准确判定损伤的位置。曲率模态差(DI)作为损伤参数，随着裂纹深度增加而增大，可以很好地反映结构的损伤程度。
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-mine the location of the damage. As a damage parameter, the curvature mode difference (DI) increases with the increase of crack depth, which can well reflect the damage degree of the structure.
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