基于相似材料模拟实验平台的坐标框架构建及精度分析
投稿时间:2017-09-22  修订日期:2018-03-07  点此下载全文
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作者单位E-mail
李春意 河南理工大学 测绘与国土信息工程学院 lichunyi2005@126.com 
刘相臣 河南理工大学 测绘与国土信息工程学院 1512039055@qq.com 
基金项目:国家自然科学(41671507,41101520)
中文摘要:相似材料模拟实验中,科学、快速、准确地获取研究对象的位移场信息是实验的重要环节之一,而构建高精度的局部坐标系是获取目标点位空间信息的基础。基于此,提出了一种实用的高精度的相似材料模拟实验平台坐标框架的构建方法,建立了坐标框架误差模型,得出了坐标框架点位中误差计算公式,并通过设计的现场实验对模型进行了分析和验证。结果表明,量距误差分别随尺长改正量和温度改正量的增加而线性增加。在不同仪器测角精度下,坐标框架点位中误差随尺长改正量和温度的增加都呈现先减小后增大的趋势,都存在极小值,并且随着仪器精度的提高,点位中误差逐渐减小。计算得到坐标框架上两待定点点位中误差理论值分别为 、 ,而通过现场实验和分析计算,对应两点的实际点位中误差分别为 、 ,实测精度值优于理论计算值。
中文关键词:相似材料模拟  坐标框架  点位精度  实验平台  误差模型
 
Construction Method of Coordinate Frame Based on Similar Material Simulation Experiment Platform and Precision Analysis
Abstract:In similar material simulation experiment, it is an important process to obtain the displacement field of the subject investigated scientifically, fast and precisely, and the construction of local coordinate system with high precision is the foundation of obtaining spatial information of subject points. Based on this, this paper puts forward a practical construction method of coordinate frame in similar material simulation experimental platform, meanwhile established the coordinate frame error model, obtained the calculation formula of the point mean square error in the coordinate frame, and analyzed and validated the model through the design of the field experiment. The results show that measuring error increases linearly with the increase of length correction and temperature, respectively. In different measuring precisions of angle, the point mean square error of the coordinate frame, along with the increase of length correction or temperature, has a trend of increase with decrease at first and has its minimum, and the point mean square error decreases with the improvement of instrument measuring precision. And the calculated theoretical mean square errors of intending-set points in the coordinate frame are respectively and . Nevertheless, mean square errors of corresponding points of the field experiment are and , which are better than the theoretical calculated values.
keywords:similar material simulation  coordinate frame  positional precision  experiment platform  error model
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