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Dynamic behaviour evaluation of offshore wind turbine using geotechnical centrifuge tests
| Content Provider | Scilit |
|---|---|
| Author | Seong, J. T. Kim, J. H. Kim, D. S. |
| Copyright Year | 2018 |
| Description | Book Name: Physical Modelling in Geotechnics |
| Abstract | Understanding of dynamic response of offshore wind turbine is important to evade structural hazards by dynamic loadings such as resonance vibration and earthquake. Although dynamic characteristics of the offshore wind turbine are affected by soil stiffness and foundation type, there have been only a few experimental studies on this subject to supplement and calibrate the analytical studies considering soil-foundation-structure interaction (SFSI). Geotechnical centrifuge experiment can provide reliable experiment result as it can reproduce field stress condition of the soil with a scaled model test. The goal of this research is to evaluate the natural frequency and seismic behaviour of the offshore wind turbine for monopile, monopod, and tripod foundation considering SFSI by geotechnical centrifuge test. Natural frequency was evaluated in fixed-based scaled model test and SFSI geotechnical centrifuge test to evaluate the period lengthening due to SFSI. Results showed that if the same amount of material was invested, Tripod foundation showed most stiff behaviour. Also, monopile and monopod test results were compared with existing analytical evaluation method. Results showed less than 6% difference in period lengthening ratio (PLR). Seismic behavior was evaluated by applying series of seismic loadings and measuring the structural acceleration, permanent rotational displacement. The result showed that difference in seismic behaviour by foundation types should be considered. This chapter aims to evaluate the natural frequency and seismic behaviour of offshore wind turbine with monopile, monopod, and tripod foundations using the geotechnical centrifuge test. The natural frequency of offshore wind turbine model was measured in fixed-based condition and soil-foundation-structure interaction (SFSI) condition to evaluate the effect of SFSI to the natural frequency. Centrifuge experiment can raise the level of confinement to real field condition for the scaled model by applying centrifugal force, thereby reproducing the actual field behaviour of the soil. A 1/4 size NREL 5 MW reference wind turbine was used as a prototype for scaled model production. The fixed-based model consists of substructure and bolt-fixed base. This model was produced to evaluate wind turbine's natural frequency without considering SFSI. Substructure of monopod and tripod foundation was designed to have the same diameter with the tower. Young's modulus was evaluated from the shear wave velocity profile acquired from bender element test. |
| Related Links | https://content.taylorfrancis.com/books/download?dac=C2018-0-86959-9&isbn=9780429438660&doi=10.1201/9780429438660-113&format=pdf |
| Ending Page | 753 |
| Page Count | 5 |
| Starting Page | 749 |
| DOI | 10.1201/9780429438660-113 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2018-07-11 |
| Access Restriction | Open |
| Subject Keyword | Book Name: Physical Modelling in Geotechnics Geological Engineering Offshore Wind Turbine Turbine Was Used |
| Content Type | Text |
| Resource Type | Chapter |
