考虑连接段厚度影响的风力机组合塔架优化设计*

钢-混组合塔架是低风速地区风力机支撑结构的主要型式之一,连接段对结构的性能有重要影响,组合塔架结构设计直接影响风力机的安全与建设成本。为改善塔架的结构性能以及降低塔架造价,构建了以各塔段外径、壁厚、连接段厚度和混凝土段高度等关键几何尺寸为设计变量,以塔架的固有频率、应力、位移和稳定性等关键性态指标为约束条件,以塔架成本为目标函数的优化设计数学模型。利用模型对某3 MW风力机组合塔架进行优化设计。结果表明：优化方案的塔架总成本减少了15.7%,塔架的整体结构性能得到一定改善;混凝土段高度为塔架总高度的62%时总成本最低;考虑连接段厚度的优化模型能有效调整连接段的受力性能,有利于提高塔架整体优化的效果。考虑组合塔架连接段厚度的优化设计可为同类塔架的设计提供参考。

Optimization Design of Hybrid Wind Turbine Tower with Consideration of Connecting Section Thickness

The steel-concrete hybrid tower is one of the main supporting structures of wind turbine in low wind speed areas, and the connecting segments have an important influence on the performance of the structure. The structure design of hybrid tower directly affects the safety and construction cost of the wind turbine. In order to improve the structural performance and reduce the cost of the tower, a mathematical model of optimal design with tower cost as objective function was constructed, which took key geometrical dimensions such as outer diameter of each tower section, wall thickness, thickness of connecting section and height of concrete section as design variables, and took key property indexes such as inherent frequency, stress, displacement and stability of the tower as constraints. Then the model was used to optimize the structure of a 3 MW wind turbine hybrid tower. The results showed as follows: the total tower cost of the optimized solution was reduced by 15.7%, and the overall structural performance of the optimized tower was improved to some extent; the total cost was lowest when the height of the concrete section was 62% of the total tower height; stress performance of the connection section for the optimized model considering the connection section thickness was effectively adjusted, and the overall optimization effect of the tower was improved. The optimized design considering the thickness of the connection section of the hybrid tower may provide a reference for the design of similar towers.