Research On The Key Technology Of Groove Type Condenser Structure

Condenser is an important component of groove type solar thermal powergeneration system. Generally, it is located in the empty flat field that the mainrandom load is wind loads, so the mechanical analysis is based on the determinationof wind loads. At the same time, the cost of condenser is more than the entire systemof50%, which could be brought enormous economic benefits by optimization.Moreover, due to the relatively low stiffness of the groove type condenser lens, thewind-induced deformation may cause the concentration variation, so that theefficiency of solar power generation system would be reduced. Therefore, it is reallynecessary to research on the reliability based on displacement. Considering aboveaspects, the following research and analysis were done in this paper.Firstly, the method of wind speed prediction was studied, especially for the timeseries model which established by using before and after wind speed sequencedeletion segment. Then the missing segments were respectively predicted byusing sequential prediction and inverse prediction method, the final prediction windspeed were obtained by the mean of two methods. And the previous methods werecompared to illustrate the effectiveness of the proposed method.Secondly, the finite element model was established by MIDAS. Then staticanalysis was done under the effect of weight and equivalent wind load. After that theanalysis of dynamic was processed under the action of wind load. The results showthat: when calculation the equivalent static wind load, condenser could be regardretaining structure, and the deformation and stress of the condenser structure is lessthan design value.Once again, the member section size which above of the bottom support andthe initial tension of cable were regarded as the design parameters, the structuraldisplacement and stress as constraint conditions. Uniform Design Method wasadopted to approximately optimize a condenser under the action of wind load. Afterthat the approximate function between the target values (displacement, stress andconsumption of steel) and parameters were achieved. Meanwhile, the recommendedsection specifications of members were given under the different displacementlimits. The results show that: the optimized structure’s steel consumption comparedto the existing structure to save11.5%, the optimization effect is obvious.Finally, the reliability analysis based on the structural deformation was conducted by using the finite element analysis software MIDAS and responsesurface method. Then the sensitivity analysis of the basic random variables was done.The results show that: the structure reliable probability under average wind load is99.79%, which can meet the requirement of reliability of condenser structure. Themost obvious effect on reliability of structure is wind load uncertainty.