基于同步挤压和时间窗的时变结构损伤识别

Time-varying structural damage detection based on synchrosqueezing and time window method

在连续小波变换的基础上,运用同步挤压和时间窗思想,提出了新的时变结构损伤识别指标。通过简支梁刚度突变、刚度线性变化和简支梁多点时变损伤三个数值算例对提出的损伤指标进行了验证,结果表明:该指标能够有效地识别结构的时变损伤,且时间窗的选取基本上不影响时变损伤指标的取值。

Synchrosqueezing algorithm and time window are introduced to present a new damage index to detect structural timevarying damage based on continuous wavelet transform.The effectiveness of the proposed index is validated via a numerical example of simply supported beam with abrupt stiffness reduction,linear stiffness reduction and multiple point time-varying damage.The results demonstrate that the presented damage index can detect structural time-varying damage accurately and the selection of time window length has little influence on the value of time-varying damage index.