摘要
空间直线度误差是评定机械产品精度的一项重要指标,实际工程中对空间直线度误差评定算法的精度要求越来越高.为了准确评定空间直线度误差,参照国家标准(GB/T 11336—2004),采用三维最小二乘方法建立了空间直线拟合的数学模型,并给出了该数学模型的精确解.基于最小二乘拟合中线,采用空间投影、坐标变换和格点法求得最小二乘中线包容圆柱面直径.采用数值算例验证了新方法的有效性.提出的空间直线度误差评定方法精度高、鲁棒性好且易于编程实现.
Spatial straightness error is very important for the assessment of mechanical product precision.The spatial straightness error evaluation algorithm with high precision is needed in real project. In order to evaluate the spatial straightness error more accurately,a mathematical model of spatial straight line fitting was established based on the national standard( GB /T 11336—2004) and three-dimensional least squares method,the exact solution to the model was deduced. The diameter of the minimum cylindrical surface of the least squares was obtained by using the method of spatial projection,coordinate transformation and lattice method.The proposed method was validated by numerical experiments. It is not only more accurate and robust,but also easy to be implemented.
出处
《北京航空航天大学学报》
EI
CAS
CSCD
北大核心
2014年第10期1477-1480,共4页
Journal of Beijing University of Aeronautics and Astronautics
基金
"十二五"国防基础科研资助项目(C0320110002)
关键词
空间直线度误差
空间直线拟合
空间投影
坐标变换
三维最小二乘法
spatial straightness error
spatial straight line fitting
method of spatial projection
coordinate transformation
three-dimensional least squares method
