In new state standard < < machining center testing items - accuracy testing > > [ refering to iso / dis10791 ] , issued in 1999 , the test of straightness accuracy has been changed . now it becomes more scientific and reasonable . in old state standard , the testing of straightness accuracy of kinetic part only focus on vertical and " horizontal plane , and it only includes two linear errors ; but in new state standard , we not only measure those two linear errors , but also measure the errors of pitching , deflecting , and inclining of the kinetic part , so it includes two linear errors and three angle errors 1999年公布的国标《加工中心检验条件?精度检验》 (参照iso dis10791订)中,直线度等项的检测做了更为科学的实质性更改,坐标移动的直线度以由只检测垂直面和水平面内的两个平移线值误差,改为用移动坐标方向之外的另两个坐标的平移线值误差和移动部件绕三个坐标轴的俯仰,偏摆和倾斜三个角值误差综合表征。
Based on the lorentz transformation on especial condition , making use of coordinate transformation and matrix theory , the matrix expression and vector expression of lorentz transformation about two inertial frames that relative speeds orientation is random and isnt follow axes of ordinate are educed . 2figs . , 3refs 从特殊情况下的洛仑兹变换出发,利用坐标变换和矩阵理论,导出了两个惯性系的相对运动速度取向任意,且不沿任一坐标轴洛仑兹变换的矢量表达式和矩阵表达式.图2 ,参5
Thirdly , in the traditional decision tree based ensemble gene mining method , the gene number in the node of the tree is constrained to one . a modified algorithm is proposed , which uses the character of the fldt measure to realize the extension that the number of the gene contained in every node can be any number smaller than n ( n is specified by user ) . the extension cancels the traditional algorithm ’ s constraint and makes the algorithm more flexible and more powerful on the classification 第三,在传统的基于决策树的集成基因挖掘算法中,样本空间中的分类平面必须与坐标轴平行,大大限制了该算法的性能,针对此,本论文中提出了一种改进算法,该算法利用基因集合的fldt测度的独有特性,实现了节点包含的基因数目可以是小于n ( n的值由用户指定)的任意数目的改进,提高了原算法的灵活性和分类能力。
Orthogonal matrixes have special structures , and every row vector of them can be taken as a plot , which may be parametrized in n - sphere space . through the research of structures of orthogonal matrixes , the writer finds a parametrized matrix , which can express all the orthogonal matrixes . through analysing uprightness between related high - order planes and the number of required parameters , we get the maturity of this method 自然的,这些点可以用其球坐标,即与各坐标轴的夹角来参数化,作者通过观察正交矩阵的几何结构,最终找到了任意维数的随机正交矩阵的参数表示方法,通过分析相关超平面之间的垂直关系和参数化正交矩阵需要的参数个数,论证了这种表示的完备性。
Nowadays , the machining center carries through the precision inspection only following the fixed coordinates " axes , which can not completely reflects the real error of the spacial position of the practical machining outside the axes and leads to having no the directive relation between the inspected precision and the practical machining precision . so , this paper introduces that the error factors of influencing workpiece ' s outline on machining and carries out the solid inspection of every spot ' s error inside the workaround on the horizontal machining center 本文针对当前加工中心仅沿固定的坐标轴线进行精度(含几何精度和定位精度)检验,并不完全反映轴线外实际加工的空间位置真实误差,导致检出精度与机床实际加工精度无直接对应关系的现状,论述了加工时影响工件型面轮廓精度之加工中心的误差因素,对加工中心实施其工作区内各点误差的立体检测。
Then , this discourse detailedly discusses system ' s developing method and process with object arx - developing tool of autocad and microsoft visual c + + , and discusses how to extract the geometrical information and how to calculate the coordinate value of screw thread holes " axes , and discusses the calculation of rotated angles and output of cut location file , also discusses how to make use of present research result about optimization of the machining process to program 接着详细论述了运用autocad的二次开发工具objectarx和微软公司的visualc + +进行系统开发的方法和过程,讨论了如何提取图形信息和螺纹孔轴线坐标轴的计算,再到旋转角度的计算和刀位文件的输出,以及如何利用已有的加工工艺优化的研究结果进行编程等问题。