基于数字摄影测量的槽式太阳能聚光器结构检测方法研究
2019-02-19
作者：谭泽祥，董明利，孙鹏，燕必希，王君
单位：北京信息科技大学
摘要：提出了利用摄影测量技术对大型槽式太阳能聚热器支架几何量进行测量的方法。首先，建立影响截断因子的托片位置和法向量、吸热管支撑点位置和旋转轴等几何量的数学模型；其次，通过仿真确定在满足聚热效率的前提下各几何量的最大容许误差；再次，设计测量附件，并结合各几何量的最大容许误差和误差传递模型，计算测量附件的加工精度；最后，利用测量附件，通过摄影测量法计算待测几何参量，并求解误差量。将测量附件和数据分析方法应用于轻型槽式太阳能聚热器支架的几何量测量，并将结果同激光跟踪仪进行对比，得到摄影测量法的点位误差在x、y、z三个方向的标准差分别为0.140mm、0.083mm和0.102mm，角度误差的标准差为0.144°。根据摄影测量的结果对支架进行调节，结果表明：摄影测量法满足大尺寸的几何量测量高精度要求，能够为槽式太阳能支架的加工、安装及检测提供理论依据。
关键词：槽式太阳能支架；摄影测量；测量附件；精度分析
中图分类号：TG806；TH162文献标志码：ADOI：10.3969/j.issn.1000-7008.2019.02.029
Research on Space Frame Structure Detection Method of
Parabolic Trough Collectors Based on Digital Photogrammetry
Tan Zexiang，Dong Mingli，Sun Peng，Yan Bixi，Wang Jun
Abstract:A method of measuring the geometric quantities of a large trough solar collector with photogrammetry is proposed.Firstly，a mathematical model is established that describes the relationship between the intercept factor and the position and angle of the brace facet，the positions of the absorber tube support and the rotation axis.Secondly，the maximum allowable errors of these geometric quantities are determined by simulation.Then，measuring adaptors are designed and machined，and the machining precision are determined by the maximum allowable errors of the geometric quantities and the error propagation model.Finally，the adaptors and data analysis method are applied to the measurement of the geometric quantities of a light trough solar collector frame modular.The standard deviations of coordinate errors in x，y，z directions are 0.140mm，0083mm and 0.102mm respectively and the standard deviation of the angle errors is 0.144° by comparing with the measuring results of the laser tracker.The light trough solar collector frame modular is adjusted according to photo grammetry，the results show that photogrammetry can meet the high accuracy requirements for largesize geometry measurement，and provides a theoretical basis for the manufacturing，installation and measurement of trough solar concentrator frame structure.
Keywords:trough solar powered bracket；photogrammetry；measuring adaptors；precision analysis