摘要
在理论上推导悬臂梁轴向振动微分方程及其3种支座形式的解析解的基础上,提出了一种基于轴向振动的结构损伤识别方法.该方法以轴向振动的低阶模态振型的二阶导数为损伤指标,无需结构损伤前的完好动力指纹.该指标对结构损伤的位置和程度均很敏感,既能精确定位损伤,又能标定损伤程度,即在损伤位置将发生相反方向的突变,且突变幅度随损伤程度的增大而增大.最后对方钢管构件进行了试验,测试结果证明了该方法的可行性.
A damage identification method based on axial vibration was presented on the basis of theoretical derivation axial vibration differential equation and analytical solution of three kinds of support form. This method takes the second derivative of low-level axial vibration modal shape as damage index without the dynamic fingerprints of undamaged structure. The index is very sensitive to both the location and degree of structural damage, which can accurately locate and calibrate the damage. That is, it will change to the opposite direction suddenly in the damage position. Mutations amplitude increases with the degree of damage. Steel components are experimented and tested, the results also proved the feasibility and viability of the proposed method.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2009年第12期1061-1066,共6页
Journal of Tianjin University(Science and Technology)
基金
国家自然科学基金资助项目(50808005)
关键词
损伤识别
轴向振动
支座形式
模态分析
damage identification
axial vibration
support form
modal analysis
