中文摘要：

近海风机在随机波浪荷载作用下的动力反应是近海风机结构设计中的关键问题之一。用谐波叠加法研究了随机风、浪荷栽时程的模拟方法，并探讨了考虑波浪波面高程变化时的波浪力计算方法。分两种荷载工况，采用动力有限元法计算了海上风机在随机波浪荷栽作用下的动力反应，探讨了波面高程变化对于海上风机动力响应计算的影响。计算结果表明，当不计波面高程变化时，波浪力在波峰位置被低估，在波谷位置被高估，波面高程变化对风机塔架动力响应计算结果将产生影响，在实际工程中应予以适当考虑。

英文摘要：

Dynamic response of the offshore wind turbine under random wind and wave loads is a major problem in offshore wind turbine structural design. The random wind and wave time histories were calculated by the harmony superposition method, and the wave load calculation method considering the wave surface elevation variation was also investigated. In time domain, the dynamic responses of offshore wind turbine under random wind and wave were studied by the dynamic FEM in two cases. The in- fluence of wave surface elevation variation on dynamic responses calculation is discussed. The calculation results show that the random wave loads were underestimated at the wave peak and overestimated at the wave trough if not considering the wave surface elevation variation effect. The wave surface elevation variation will also affect the dynamic response of offshore wind turbine tower which should be considered in practical engineering design.