APPLICATIONS OF COMMON REAL-TIME IDENTIFICATION OF DYNAMIC CHARACTERISTICS FOR OFFSHORE STRUCTURES

Abstract

The dynamic behavior of offshore structures becomes complex due to the effect of the combination of marine environmental and operational conditions. There are some damages and failures that need to be detected early to establish a suitable maintenance strategy. Therefore, the online structural health monitoring (SHM) system has been investigated and developed continuously to ensure safety performance by timely warning. The SHM requires a suitable real-time identification of dynamic characteristics of offshore jacket structure. This article presents a discussion of the advantages, disadvantages, and development trends of existing real-time identification systems and techniques commonly applied to offshore jacket structures. The main identifications in the real-time domain methods including the Short-Time Fourier Transform (STFT), Wavelet Transform (WT) and Hilbert Huang transform (HHT) techniques in predicting dynamic characteristics were also discussed and evaluated. Meanwhile, HHT is the most suitable identification method for real-time identification methods in SHM of offshore jacket structures.