Signal Extraction for Weak Vibration Response of A Dam in Complex Strong Noise [复杂强噪声下坝体微弱振动响应信号提取]

作者：Li H.; Bao T.; Gu C.

来源：Journal of Basic Science and Engineering, 2020, 28(6): 1326-1336.

DOI：10.16058/j.issn.1005-0930.2020.06.006

• Damage identification
• De-noising method
• Forced vibration response
• Singular spectrum analysis
• Variational mode decomposition
• Vibration signal

In the process of structural damage identification of a dam based on vibration response induced by the water flow, the vibration signal not only contains the structural damage information, but a large amount of low and high frequency noise.The traditional de-noising method cannot extract the weak vibration signal of a dam completely.The variational modal decomposition(VMD) algorithm was improved and used to de-noise due to the advantages of high computing efficiency, strong noise resistance, and anti-aliasing.However, the improved VMD algorithm can only filtered the high frequency noise and the principal component of the dam vibration signal was still coupled in low and dense frequency noise.Therefore, the singular spectrum analysis(SSA) algorithm, which has the advantage in extracting the principal component, was applied to filter the low frequency noise from the signal denoised by the improved VMD algorithm.Experimental data show that this joint algorithm can provide a prerequisite for structural damage identification and localization based on vibration response.

• 单位
  河海大学; 三峡大学; 水文水资源与水利工程科学国家重点实验室