论文部分内容阅读
在结构损伤识别中,测试振型往往是不完整的,这阻碍了结构损伤识别技术的应用效率。提出了一种采用缩聚应变能与频率相结合的损伤识别定性与定量方法。采用基于Neumann级数展开的方法对有限元模型进行缩聚,定义了单元缩聚模态应变能,并证明了缩聚模态应变能的变化对损伤的敏感性;将单元缩聚应变能变化率作为标识量来识别损伤的位置;在损伤位置初步判定的基础上,采用特征值灵敏度法求解损伤程度。以一简支钢梁为例证明了所提出的方法。结果表明:在测量模态数据有误差的情况下也能较好地给出损伤识别结果。
In the structural damage identification, the test vibration mode is often incomplete, which hinders the application efficiency of structural damage identification technology. A qualitative and quantitative method of damage identification based on the combination of polycondensation strain energy and frequency is proposed. The method based on Neumann series expansion was used to polycondensate the finite element model, the unitary polycondensation modal strain energy was defined, and the sensitivity of polycondensation modal strain energy to damage was proved. The change rate of unit polycondensation strain energy was used as the identification quantity To identify the location of the damage; based on the preliminary determination of the damage location, the eigenvalue sensitivity method was used to solve the damage degree. Taking a simple supported steel beam as an example, the proposed method is proved. The results show that the damage identification result can be well given when there are errors in the measured modal data.