风力发电机组塔筒及桩筏基础的结构共振特性分析

Analysis of resonance characteristics of pile-raft foundations and wind turbine tower structures

梁板式桩筏基础是陆上风机常见的基础形式,设置桩基可以增强基础阻抗,从而改善风机结构共振性能。然而,在风机共振频率设计时,常常假定结构底部为刚性固定,忽视了不同基础形式的差异。文章在基础水平-摇摆动力阻抗及风机共振频率研究的基础上,以某风电场工程为实例,研究了陆上风机的共振特性及基础影响。研究发现,与无桩基础相比,有桩基础明显地改善了风机结构的共振性能。

Pile-raft foundation is a conventional foundation type for onshore wind turbine structures. The increased impedance of foundation caused by adding piles under the raft can improve the resonance characteristics of the structures. However, current design codes for resonance design of wind turbine structures mostly assume that the bases of structures are fixed rigidly, so influences of different foundation types are ignored. Based on the research results of foundation impedance and resonance characteristics of offshore wind turbine structures, the impedance and characteristics of onshore wind turbine structures are studied according to a practical wind farm project. The study presents that the pile-raft foundation significantly improves the resonance characteristics of onshore wind turbine structures comparing with the footing without piles.