Working Mode Identification Method for High Arch Dam Discharge Structure Based on Improved Wavelet Threshold–EMD and RDT Algorithm

Prototype vibration response data of high arch dam discharge structures inevitably mix various noises under the excitation, which adversely affects accuracy working modal identification structure. To effectively filter noise and reduce aliasing for better accuracy, this study proposes an improved threshold method based on wavelet threshold–empirical mode decomposition (EMD) random decrement technique (RDT) algorithm structures. On basis measured dam, is adopted to out most high-frequency white boundary accumulation effect EMD decomposition. Detrended fluctuation analysis (DFA) utilized low-frequency flow after The natural frequency damping ratio structure system are obtained by RDT algorithm. engineering examples show that proposed can accurately signal structure, retain characteristic information, improve recognition structural response, avoid complex ordering process system, ease parameter This be applied other large structures, as well.