海洋工程装备制造现场大尺寸组网测量

为满足海洋工程高端装备的制造与装配过程中对宏观测量大尺寸和局部细节高精度的双重要求,提出了一种构建全局控制网络并优化转站精度的方法。在研究激光跟踪仪测量规律的基础上,对激光跟踪仪测量过程中误差的传递建立了数学模型,并据此来预测跟踪仪在单点测量时的不确定度。试验证明实际测量与仿真数据具有较好的一致性。基于该试验结果,预先为激光跟踪仪测量的全局控制点分配权重,并把权重融入奇异值分解法(SVD)中,求得转站参数。使用均方根法(RMS),与普通SVD法相比较,发现带权重的SVD法具有统计学意义上的优化性。使用转站参数的评价方法分析了转站精度,利用整体最小二乘法,综合考虑两个测站的测量误差,分析出影响转站精度的因子,为后续研究转站精度的提高打下基础。

Large scale network measurement in the field of marine engineering equipment manufacturing

In order to meet the double requirements which are the large-scalein measurement range and high-precision in local detail in the manufacturing and assembly process of marine engineering,a method to construct the global control network and optimize the transfer station is presented in this paper.Based on the research on the rules of the measurement process of laser tracker, the mathematical model of measurement process is established, and the uncertainty of single point measurementis predicted according to the result.The experiments show that the actual measurement and simulation data are in good agreement.Therefore, the point measured by the tracker different weight distribution is given, andwhich is integrated into the SVD decomposition method,then the parameters of transfer station can be obtained.And compared with the ordinary SVD in RMS, the SVD method with the weight has a statistically significant optimization.Transfer station parameter is used to analyze the transfer station accuracy.The measurement errors existed in bothtwo stations are considered with TLS (total least squares),the affecting factors of precision are figured out, it laysthe foundation for the follow-up study to improve the precision of the transfer station.