结构损伤检测类MAC应变频响函数识别指标的研究

Research on MAC-like Damage Detection Indicator of Strain Frequency Response Function

提出基于应变频响函数的参数MACsfrf作为损伤识别指标,并应用于简支板的损伤检测。结果表明,MACsfrf对损伤的敏感程度高于基于振型的MAC。MACsfrf可用于判别结构是否存在损伤以及定性评价损伤。

A method based on Strain Frequency Response Function （SFRF） data is presented for identifying damage in a structure. Conventional method such as Modal Assurance Criterion （ MAC ） is effective to detect damage locations as long as the modal shape can be measured experimentally. In the same case, the proposed MAC -like damage detection indicator using Strain Frequency Response Function implements better. The application of this technique was discussed on the basis of a numerically simulated simple-supported slab. A comparison was made with other existing damage detection technique. Results indicated that the MACsfrf was more sensitive to damage than Modal Assurance Criterion （ MAC ）. The presented method is simple in identifying the existence of damage and its degree, and it can be an alternative to conventional damage detection methods.