*Article* **Dynamic Analysis on Pile Group Supported Offshore Wind Turbine under Wind and Wave Load**

**Yusha Shi 1, Wenjuan Yao 2,\* and Guoliang Yu 3,\***

	- Shanghai 200240, China

**Abstract:** With growing demand for renewable wind energy, the number of offshore wind turbines increased rapidly in recent years. This paper uses the improved Tajimi model and transfer matrix method to analyze the dynamic response of pile group supported offshore wind turbine under wind and wave load. The vibration equation of the structure is established by tower discretization. The calculation result is compared with the numerical simulation result. The horizontal displacement of the structure under loads with different frequencies can be obtained. The wind speed and the foundation impedance are found important to the structure displacement. The pile–pile interaction factor depends on the pile spacing, the pile embedment ratio, and the incidence angle.

**Keywords:** offshore wind turbine; pile–pile interaction factor; wind load; wave load; transfer matrix method
