中文摘要：

以25k W碟式太阳能电站为例,建立了其双轴跟踪机构的有限元模型,开展了基于数值风洞模拟的风载荷分析,利用有限元分析软件ANSYS数值计算了双轴跟踪机构在最不利工况下的位移特性和应力分布,得到了作为机构关键承载部件的回转支撑座、高度角伸缩机构支撑板以及支撑桁架处于最不利工况时的应力应变情况。结果表明：在8级风作用下,且机构处于最不利工况时,斯特林热机安装位置处具有较大位移,回转支撑座的最大应力在（220~275）MPa之间,支撑板的最大应力则达到了525MPa,但均在所选材料许用应力范围内;而现有结构和材料下支撑桁架则不满足设计强度要求,为此提出了一种满足承载要求的支撑桁架设计方案。所做研究为双轴跟踪机构进一步的优化设计及相关研究提供了依据。

英文摘要：

The finite element model of two-axis tracking mechanism of a 25 k W dish solar power station was established. Then,the wind load was analyzed basing on numerical wind tunnel simulation,and the displacement characteristic and stress distribution of two-axis tracking mechanism under the most unfavorable conditions were numerically calculated with finite element analysis software ANSYS. Finally,it obtained the stress and strain of the crucial bearing parts of the swivel bearing support base,the support plate height angle of telescopic mechanism and supporting truss under the most unfavorable conditions. The results showed that there was a major displacement at the installation location of stirling engine and the maximum stress of rotation support base was between（220 ~275）MPa,and the maximum stress of the support plate had reached 525 MPa when the mechanism was under class 8 wind loads and the most unfavorable conditions. It concluded that the support truss was constituted by present structure and material could not meet the requirement of designed strength.Therefore,a design scheme of support truss was proposed,which can fulfill the designed load requirement. This study can provide clue for further optimization design and related research of two-axis tracking mechanism.