| Title |
Impedance-based Long-term Structural Health Monitoring for Jacket-type Tidal Current Power Plant Structure in Temperature and Load Changes |
| Keywords |
long-term structural health monitoring;piezoelectric sensors;impedance;temperature;load;principal component analysis;장기 건전성 모니터링;압전센서;임피던스;온도;하중;주성분 분석 |
| Abstract |
Jacket-type offshore structures are always exposed to severe environmental conditions such as salt, high speed of current, wave, and wind compared with other onshore structures. In spite of the importance of maintaining the structural integrity for offshore structure, there are few cases to apply structural health monitoring (SHM) system in practice. The impedance-based SHM is a kind of local SHM techniques and to date, numerous techniques and algorithms have been proposed for local SHM of real-scale structures. How-damage features from impedance signals. In this study, the impedance-based SHM was carried out on a 1 /20-scaled model of an Uldolmok current power plant structure under changes in temperature and transverse loadings. Principal component analysis (PCA) was applied using conventional damage index to eliminate principal components sensitive to environmental change. It was found that the proposed PCA-base approach is an effective tool for long-term SHM under significant environmental changes. |