局部冲刷对复合筒基风电结构体系动力响应影响

建立风力机塔筒-复合筒型基础-冲刷地基的耦合动力分析模型,通过实测数据验证数值模型的准确性.基于已完成的复合筒基地基冲刷试验,在耦合动力模型中实现冲刷地基模型的准确建立,考虑局部冲刷后应力历史对剩余土体参数的影响,分析风力机结构体系的动力响应特征,将计算结果与不考虑冲刷影响的计算结果进行对比.结果表明:地基的冲刷使得风...

INFLUENCE OF LOCAL SCOUR ON DYNAMIC RESPONSE OF WIND TURBINE STRUCTURE SYSTEM WITH COMPOSITE BUCKET FOUNDATION

Firstly, the dynamic coupling model of wind generator tower-composite bucket foundation-foundation is established. The accuracy of the numerical model is verified by measured data from the actual engineering. Then, based on the published experimental results of wave and current scour around composite bucket foundation, the accurate scoured topography is established in the numerical model and the effect of the stress history after local scour on the remaining soil foundation parameters is considered. At last, the dynamic response characteristics of the wind turbine structure system are analyzed. The results are compared with those without considering local scour. Analysis results show that local scour to foundation reduces the natural vibration frequency of wind turbine structure, which leads to bigger generation risk of the wind turbine structure system. The vibration speed of the composite bucket foundation increase obviously after considering local scour of the foundation, and the maximum increase value reached to 8%. So the influence of local scour on the dynamic response of the structure system must be considered in the design of offshore wind turbines with composite bucket foundation, but the effect of the stress history after local scour on the remaining soil foundation parameters can be ignored.