摘要
本文基于频率法进行损伤识别的基础 ,从理论上推导了损伤导致某阶频率降低与损伤位置的关系和该阶曲率模态 /应变模态的振型变化相近。并通过数值仿真的结果验证了理论分析的结果。在此基础上给出了损伤状态下通过不同阶模态频率改变率比值来进行损伤定位的新方法 ,并将其应用于实际钢梁的分析中 ,得到了较好的结果。最后文中阐述了通过频率法进行损伤识别的优点和局限性。
By virtue of damage identification in frequency domain, the relationship between structural eigenfrequency and damage location is deduced theoretically. It is like an identification method in accordance with the change of curvature modal shape or strain modal shape. The procedure is verified by numerical simulation. A method of damage positioning is presented, based on the change inspection of multiple orders of modal frequency calculation results. It shows good effect when applying the method on a real steel beam. Virtues and limitations of the method are discussed.
出处
《振动与冲击》
EI
CSCD
北大核心
2004年第2期28-30,17,共4页
Journal of Vibration and Shock
关键词
损伤定位
频率法
损伤识别
仿真
钢梁
曲率模态振型
Computer simulation
Failure analysis
Frequency domain analysis
Mechanical testing
Strain
