由覆盖性测试应变识别简支梁破损

梁在破损处的应变突变明显，其它处甚至紧邻破损处的应变没有明显变化，由应变振型识别梁的破损，测试应变应沿长度覆盖整个梁，采用大标距应变片或应变测试辅助装置进行覆盖性测试是可行的，测量结果是标距范围内应变的平均．采用奇异值分解方法处理测试应变数据，可将微弱突变信号分离出来．

Identifying Damages to Beams with Simply Supported Ends by Means of Covering Strain Testing

There are obvious strain changes at damages in beams, whereas in other places or even in adjacent portions there are no such obvious changes in strain. When identifying the damage by the mode of strain vibration, the measurement should be conducted lengthwise and cover the whole beam. It is feasible to conduct covering testing by adopting large-length foil gauge or other supporting devices for testing strain. The measurement results are the average of the strain within the gauge length. Weak strain signals can be isolated by handling the measurement data using singular value analysis.