应变模态法在悬臂梁结构损伤监测诊断中的应用

Strain Modality Law to Cantilever Beam Structure Damage MonitorDiagnosis Research and Application

工程实际中各种结构的应变模态对于结构的微小损伤具有高度敏感性,依据这一特点及应变模态振型的变化,便于及时监测、诊断结构的损伤程度及损伤位置,以保证结构的可靠性及安全性.从理论和实验的角度探讨了应变模态的原理和参数识别方法,并通过实验对悬臂梁进行应变模态参数识别,获得了悬臂梁多阶应变模态的振型图.根据悬臂梁的振型变化,判断出结构微小损伤的具体位置,并由此验证结果将应变模态法应用于工程实际并对各种结构损伤进行监测诊断的可行性.

In engineering practice, each kind of structure strain modality has the very high sensitivity to the structure small damage, inspiresto to make the change based on the strain modality, facilitates in the prompt monitor and the diagnosis structure damage and damages the position, guarantees the structure the reliability and the security. This article investigates the strain modality from the theory, the experiment and the strain modality parameter recognition methods to carry on the strain modality parameter recognition through the experiment to the cantilever beam. The paper obtains the cantilever beam multistage strain modality to inspire the chart, and inspires through the cantilever beam structure strain modality change, the precise judgment structure small damage concrete position, and confirms the strain modality method from this in the project actual to each kind of structure damage monitor diagnosis feasibility.