Finite Element Analysis Of The Bearing Capacity Of High-power Dish Solar Concentrator Grid

The condenser grid structure is an iMPaortant part of the high-power-dish solarthermal power generation system, which not only bears two-thirds of the weight of theentire system, but also used as the framework of collector mirror that has decisiveiMPact on collecting efficiency. In order to make the solar thermal power generationsystem work properly, the strength of the steel frame as well as condenser’s have tomeet following two requirements: first, the framework won’t collapse under12gradewind, that is meets the strength requirement; Secondly, the framework could meet thework demand, that is meets precision requirements. Therefore, in light of the existingdesign model, the thesis focuses on the strength analysis and precision analysis aswell as the optimization of the condenser grid structure of25KW dish solar condenser.Hoping to make moderate contribution to the optimization and designing of dish solarpower system.Firstly, strength analysis of condenser grid structure is studied. The finiteelement model of grid refinement is established based on the geometric model; therelevant parameters of normal operating mode and structure checking operating modeis analyzed and clarified; the load wind and stress characteristics of condenser gridstructure is discussed. Stress and deformation cloud picture of condenser gridstructure in normal operating mode and structure checking mode and a seriousiMPaortant conclusion gained are as follows: first, in normal working conditions, theweight of the grid have great iMPact on its deformation, deformation increasesgradually with the increases of grid altitude angle, and when the altitude angle is90°,the degree of deformation reaches maximum value of61mm; Second, concentratorgrid structure meets the demands under the structure check load.Secondly, property analysis of condenser grid structure is studied. Deformationanalysis of condenser grid structure in maximum working loads condition andinstallation error condition is discussed based on the finite element model. MATLABnumerical is used to calculate the position of the focal spot after grid deformation.The corresponding deformation nephogram and the stimulation diagram of focal sportposition are obtained. In maximum working load condition, when the altitude angle of condenser grid is90°, the root-mean-square value of deformation reaches thedeformation mean value of9mm; the focal sport position after deformation and theideal position are basically in coincidence, which manifests that the condenser canwork normally, and meet the precision requirements.At last, natural vibration characteristics analysis and improvement design ofcondenser grid are discussed. Modal analysis manifests that, the first8order intrinsicfrequency of grid structure mainly in1.5547Hz-9.2354Hz, which is not prone to windload resonance, but problem of insufficient rigidity is exist. In order to improve thelocal stiffness, this thesis proposed three improved scheme.