Structure Optimization And Model Preparation For Solar Pavement Of Hollow Slab Based On Micro Photovoltaic Array

In order to study the reasonable solar pavement structure with hollow slab,a solar pavement structure with hollow slab that based on micro-photovoltaic array was proposed.The optimum scheme of structure size,material parameters and combination of micro photovoltaic array was supposed to propose by analog simulation of mechanical characteristics and power generation efficiency,and the solid model was maded and prepared for performance test the result,which could provide a reasonable and reliable foundation for the fo llowing research and engineering application of hollow plate solar pavement.1)A solar pavement structure with hollow slab that based on micro-photovoltaic array was proposed,nine factors affecting its mechanical properties were selected based on orthogonal experiment design method,then the combinations of each factors's value were determined,three-dimensional finite element model was established for numerical simulation of the structural mechanics,the critical load position was found out on the center of transparent surface layer.The influence raw of each factor on mechanical response and the optimum size of the structure were acquired and determined using the single-dimensional sensitivity analysis,the optimum size is:70cm×70cm×25cm,including the hollowed cavity with the height of 3cm,the transparent surface layer with size of 60cm×60cm×0.75cm,the concrete side wall with width of 5cm and the PMMA bulkhead with thickness of 0.3cm.2)The voltage current characteristic of the proposed photovoltaic panel was tested,four factors affecting the efficiency of power generation were selected based on orthogonal experiment design method,then the combinations of each factors's value were determined,the simulation analysisof power generation efficiency was carried out by using the software of photovoltaic system design,and the influence law of each factor was acquired by usting the single-dimensional sensitivity analysis method.The reasonable arrangement combination of micro-photovoltaic array was optimized and determined,which means the micro-photovoltaic array's inclination,azimuth,hspace and the distance to the structure side wall is 28°,10°,12mm and 18mm.3)According to the requirements of structural mechanics analysis for material performance,the performance of the proposed material was selected and tested.The mix ratio of polypropylene fiber concrete was designed and its performance was tested,and its bending strength was greater than 6MPa,which indicated that polypropylene fiber could be used to preparing concrete pedestal of hollow slab solar pavement.4)The laboratory solid model the solar pavement structure with hollow slab based on micro-photovoltaic array for laboratory test was prepared by designed mould,its mechanical properties and power generation efficiency were tested.The result showed that the measured value of maximum displacement of the laboratory solid model under the standard axle load was 4.8%lower than the displacement calculated by the finite element simulation,which indicated that the finite element model can correctly simulate the structural mechanics characteristics of the laboratory solid model.Meanwhile the voltage current characteristic of the laboratory solid model was similar to single photovoltaic panel,and the actual maximum output power of the laboratory solid model was 9.1%lower than the theoretical value due to the increase of power loss by photovoltaic panel installed in series,which showed that the laboratory solid model possesses good power generation performance.In conclusion,the research results of this paper provided a reasonable reference for the following research and engineering application of the solar pavement with hollow slab based on micro-photovoltaic array.