Abstract: In the intelligent photovoltaic tracker brackets， cold-formed purlins were used to support the photovoltaic panels， and located spannig the horizontal single-axis and the module frame. Firstly， the minimum compliance of the structures was taken as the target and relative densities of elements were taken as the design variables， and the topology optimum design models were constructed under the given volume and the first natural frequency constraints. Optimal material distributions of the purlins were obtained based on SIMP (solid isotropic material with penalization) method， and this topology optimization structure was engineering designed and manufactured. Then， test load conditions were designed according to the practical environment where the photovoltaic tracker brackets were applied under different wind loads. The static and dynamic finite element analyses of the original and optimized purlins were carried out respectively， the simulation results show that the optimized purlins are improved in terms of bending resistance， torsion resistance， and natural frequency. Thus， the effectiveness of the optimization design method is verified. After that， the optimal purlins whose mass is reduced by 8.8% were also manufactured by engineering methods， and the mechanics performances were verified by the experiments. 

Key words: purlin, topology optimization, photovoltaic tracker bracket, engineering design

摘要： 在太阳能光伏跟踪支架系统中，冷弯型檩条结构被用于支撑光伏板，安装位置介于主梁与边框之间。首先构建以结构柔顺度最小为设计目标、单元相对密度为设计变量、体积与一阶固有频率为约束的拓扑优化数学模型，基于SIMP法获得檩条结构的最优布局构型，在此基础上，对拓扑优化构型进行工程化设计，并制造加工出相关结构。然后根据太阳能光伏跟踪支架实际服役于不同风速荷载下的环境，设计分步测试载荷工况，分别对优化前后的檩条结构进行静动态仿真分析，由仿真结果可知优化后的檩条结构在抗弯、抗扭性能以及固有频率方面均得到了提高，从而验证了优化设计方法的有效性。最后采用实验测试方法对优化设计后的檩条结构性能进行验证。研究结果表明，在机械性能明显增强的前提下，檩条结构实现了减重8.8%。

关键词: 檩条结构, 拓扑优化, 光伏跟踪支架, 工程化设计