大型风电机组组合式塔架结构优化设计

为解决传统单管风力发电塔架在大型风电机组应用中加工、制作、安装和运输成本大幅上升的问题,提出一种新型组合式塔架结构,并对其进行结构优化设计.该塔架上部为传统单管式塔架,下部为四角钢十字形组合截面塔柱的格构式塔架.通过对四角钢十字形组合截面的轴压极限承载力进行分析,得到组合截面的稳定系数曲线.基于粒子群算法,综合考虑应力、频率和长细比约束等因素,对下部格构式塔架的形状和杆件截面进行优化.分析结果表明,组合式塔架结构可以解决传统单管式风力发电塔架的运输问题,且用钢量节省约34%.

Structural Design Optimization of a Composite Tower for Large Wind Turbine Systems

Traditional tubular wind turbine towers may result in a great increase in the fabricating, mounting and transporting cost for large wind turbine systems. A new composite tower was proposed and then the structural optimization was carried out. The new structure is composed of a lattice tower at the bottom with four-angle combined cross-section legs and the steel tube at the top. The stability coefficients curve of the four-angle combined cross-section column subjected to axial compression was first obtained by a series of ultimate bearing capacity analyses. Considering the strength, frequency and slenderness ratio as constraint conditions, the shape and section optimization of the lower lattice tower was carried out. The optimal results show that the proposed structural system can resolve the scarcity of traditional tubular steel towers in transportation and has a 34% less steel consumption.