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基于作者提出的含穿透裂纹板的有限元模型,研究了裂纹存在时悬臂板固有频率随裂纹位置的变化规律;探讨了它与应变模态之间的关系.对悬臂板应变模态的实测结果表明,以应变代替位移或加速度作为观测量对裂纹变化是比较敏感的,并说明了一阶应变模态在悬臂板裂纹检测中的应用.
Based on the author’s finite element model with penetrating cracked plates, the variation law of the natural frequency of the cantilever plate with the crack position in the presence of a crack was studied; the relationship between the natural frequency of the cantilever plate and the position of the crack was investigated; and the strain modal of the cantilever plate was measured. The results show that using strain instead of displacement or acceleration as the observation measure is sensitive to the crack change, and the application of the first-order strain mode in crack detection of cantilever plate is explained.