GFRP风机叶片结构设计的二级优化方法

Two-Level Optimization for GFRP Wind Turbine Blade Structural Design

通过对风机叶片结构特性的分析,以叶片腹板位置和蒙皮铺层厚度为设计变量,发展了一种二级优化设计方法。首先建立腹板位置参数的代理模型,根据所建的代理模型以质量最轻为目标进行系统级优化求解出腹板位置,然后将结果传给子系统级,子系统级采取分步优化策略求解叶片铺层厚度。当两级优化结果收敛时得到叶片最佳设计。经算例验证,采用这种二级优化方法,可得到较为理想的叶片结构设计结果。

Based on the topology of wind turbine blade structures,the web position of the blade is chosen as systematical design variable and the layer thickness as size design variable,and then a two-level optimization method is proposed to determine web position and skin layer thickness.Firstly,the surrogate model of web position is established based on which the system level optimization is performed with weight minimum as objective in order to obtain the position variable values.Then the position values are passed to sub-system where the layer thickness is optimized with a fractional step strategy.When the results of system and sub-system satisfy convergent condition,the optimum blade structure design is obtained.The two-level optimization method is proved to be efficient to obtain better blade design by the given examples.