摘要
抛物面槽式太阳能聚热器支架的几何量误差影响反射镜及吸热管的安装精度,从而降低聚热效率。目前没有有效的方法指导聚热器支架的高精度组装和调节。提出一种聚热器支架几何结构的视觉引导调节方法。首先,通过动态摄影测量系统实时测量各支撑点的空间位置和角度;然后,通过一种吸热管位置约束的非线性优化方法求解最优坐标变换关系,将位置和角度的测量数据对齐至设计坐标系下,获得几何量的误差和调节量;最后,提出一种基于渐变伪彩色的调节量可视化方法,辅助PTC支架的现场人工调节。本方法不需要定义物理参考坐标系,对于支架姿态没有要求,能够在组装现场实现聚热器支架的快速、高精度调节。将本方法应用于轻型槽式聚热器支架（PTC）,空间位置的调节精度优于0.15 mm,角度调节精度优于0.15°,经过调节的聚热器截断因子提升至97%,满足聚热因子对于支架几何质量的需求。
Geometric structure error of parabolic trough concentrator（PTC） frame affects the installation accuracy of mirrors and absorber tubes. Thus, the solar energy concentrating efficiency is decreased. Until now, there is no effective method to instruct the assembly and regulation of PTC frames. In this paper, a vision guided geometric regulation method is proposed to realize PTC frame structure regulation. First, the positions and angles of all the supports are measured in real time by an online photogrammetric system. Then, the measured positions and angles are aligned to the design reference frame through the transformation calculated by an absorber position constrained nonlinear optimization. Therefore, the geometric errors and regulating amounts can be achieved. Finally, a graduated pseudo-color-based visualization method is utilized to assist the manual regulation of PTC frame supports in site. The proposed method does not need to construct reference system nor specify the attitude of the PTC frame. It is capable of conducting efficient and precise regulation in PTC frame assembly line. The method is applied to manual regulation of a light type PTC frame structure. After regulation, position and angle error of supports are reduced to 0.1 mm and 0.1°, respectively. The intercept factor is increased to 97%, which meets the requirement for a qualified PTC concentrator.
作者
孙鹏
吕乃光
董明利
谭泽祥
Sun Peng;Lv Naiguang;Dong Mingli;Tan Zexiang(Institute of Information Photonics and Optical Communications,Beijing University of Posts and Telecommunications,Beijing 100876,China;Beijing Key Laboratory of Measurement and Control of Mechanical and Electrical System,Beijing Information Science and Technology University,Beijing 100192,China;School of Instrument Science and Opto Electronics Engineering,Beijing Information Science and Technology University,Beijing 100192,China)
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2018年第10期59-67,共9页
Chinese Journal of Scientific Instrument
基金
国家自然科学基金(51475046)项目资助
关键词
视觉引导组装
动态摄影测量
抛物面槽式聚热器
几何结构调节
vision guided assembly
online photogrammetry
parabolic trough concentrator（PTC）
geometric structural regulation
