为提升碟式太阳能聚光器的性能,减小聚光器整体质量、减少加工成本,满足轻量化设计要求,以聚光器网架结构为分析对象,采取有限元理论和拓扑优化方法对传统碟式太阳能进行结构设计与改进,首先,建立完整的碟式太阳能有限元模型,导入HyperWorks软件对聚光器及网架结构进行网格划分以及静力学分析和模态分析,由于碟式太阳能聚光器的体积及迎风面积较大,外部气候条件对其影响很大,必须考虑气动载荷等各项外部影响因素,故使用ANSYS Fluent软件对其进行风洞试验仿真,获得作用在网架上的力和力矩,根据以上载荷条件对其进行优化处理获得其最佳拓扑构型.最后,基于模糊灰色关联分析理论分析碟式太阳能网架结构各风载荷系数与高度角、方位角、风速等因素的关联影响程度.研究结果表明:最终优化后的网架性能在各方面均有所提高,最大应力减小39.0%,最大位移减小5.6%,总质量减小8.0%.
To improve the performance of the dish solar concentrator,reduce the overall mass of the concentrator,reduce the processing cost,and meet the requirements of lightweight design,with the concentrator truss structure as the object of analysis,the finite element theory and topology optimization methods were adopted to improve the structural design of the traditional dish solar energy.First of all,the complete finite element model for dish solar energy was established,and then HyperWorks software was imported for mesh delineation,static analysis and modal analysis of the concentrator and the grid structure.Due to its large area and windward area of the dish solar concentrator is very sensitive to external climate conditions,and so it must take into account the aerodynamic load,including the external factors.ANSYS Fluent software was used for its wind tunnel test simulation,to obtain the force and moment acting on the grid,according to the above loading conditions of the best topology for its optimization process.Optimization was carried out to obtain the best topological configuration.Finally,based on the fuzzy gray correlation analysis theory,the wind load coefficients of the dish solar grid structure were analyzed in depth in terms of their correlation with the height angle,azimuth angle,wind speed and other factors.The results show that the performance of the final optimized grid frame is improved in all aspects,with the maximum stress reduced by 39%,the maximum displacement reduced by 5.6%,and the total mass reduced by 8%.