RationalDMIS 2020 RPS坐标系

RPS（Reference Point system）指基准点系统，其根本目的是为了避免基准变换而造成不可预知的后果；

此方法多用于汽车及航空航天行业，工件坐标系在汽车或飞机机身，或没有面线圆等基准元素；

RationalDMIS的‘多点拟合坐标系配置’可实现RPS功能，该方法在RPS基准点系统的汽车零件建立坐标系中得到了广泛的运用；

RPS，即Reference Point System（基准点系统），通过使各零部件测量基准点统一，减少了因测量基准不统一而产生的误差，从而提高了整机的尺寸精度；此方法在汽车行业使用相对普遍。在检测汽车零部件时，通常规定使用整车坐标系来进行检测，那么我们就需要考虑如何将单个零件按照RPS的要求来对齐车身的坐标系。

在多点拟合坐标系窗口中如果激活了迭代选项，点击"添加/激活坐标系"按钮后，会产生一个MACRO Item添加到程序运行窗口，MACRO中包含一整套迭代DMIS语句如果没有激活迭代选项则会产生一个CRD Item.

操作方法如下；

（1）导入cad

（2）按照图纸RPS元素要求，定义出理论元素。

定义RPS理论元素

（3）选中所有RPS理论元素，右键选择“人工测量”

$$*/
MODE/MAN
F(PT1)=FEAT/POINT,CART,3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
F(PT2)=FEAT/POINT,CART,5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
F(PT3)=FEAT/POINT,CART,59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
F(PT4)=FEAT/POINT,CART,6.4068,0.0000,-3.1056,-0.0000,-1.0000,-0.0000
F(PT5)=FEAT/POINT,CART,60.6298,0.0000,-4.8231,-0.0000,-1.0000,-0.0000
F(PT6)=FEAT/POINT,CART,0.0000,5.4267,-3.6780,-1.0000,0.0000,0.0000
MEAS/POINT, F(PT1), 1PTMEAS/CART, 3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
ENDMES
MEAS/POINT, F(PT2), 1PTMEAS/CART, 5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
ENDMES
MEAS/POINT, F(PT3), 1PTMEAS/CART, 59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
ENDMES
MEAS/POINT, F(PT4), 1PTMEAS/CART, 6.4068,0.0000,-3.1056,-0.0000,-1.0000,-0.0000
ENDMES
MEAS/POINT, F(PT5), 1PTMEAS/CART, 60.6298,0.0000,-4.8231,-0.0000,-1.0000,-0.0000
ENDMES
MEAS/POINT, F(PT6), 1PTMEAS/CART, 0.0000,5.4267,-3.6780,-1.0000,0.0000,0.0000
ENDMES

（4）执行程序手动测量这些点的位置（点元素不要求十分精确的位置测量

（5）测量后将这些点拖放到“多点拟合坐标系”窗口，并设置RPS元素，基于实际情况，勾选评定方向。

勾选“更新理论值”，拟合，添加/激活坐标系，产生DMIS语句，模型对齐；

$$/*  Header
DMISMN/'Created by [爱科腾瑞科技(北京)有限公司-031521-DEMO-11022A(力合)] on 星期四, 十二月 24, 2020', 4.0
UNITS/MM, ANGDEC, MMPS
WKPLAN/XYPLAN
PRCOMP/ON
TECOMP/ON
FLY/1.0000
MODE/MAN
SNSET/APPRCH, 2.0000
SNSET/RETRCT, 2.0000
SNSET/DEPTH, 0.0000
SNSET/SEARCH, 10.0000
SNSET/CLRSRF, 20.0000
RECALL/D(MCS)
SNSLCT/S(40-D2)
GEOALG/BF, LSTSQR
GEOALG/ANGLB, DEFALT
GEOALG/CIRCLE, LSTSQR
GEOALG/ARC, LSTSQR
GEOALG/PLANE, LSTSQR
$$
$$
$$*/
MODE/MAN
F(PT1)=FEAT/POINT,CART,3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
F(PT2)=FEAT/POINT,CART,5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
F(PT3)=FEAT/POINT,CART,59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
F(PT4)=FEAT/POINT,CART,6.4068,0.0000,-3.1056,-0.0000,-1.0000,-0.0000
F(PT5)=FEAT/POINT,CART,60.6298,0.0000,-4.8231,-0.0000,-1.0000,-0.0000
F(PT6)=FEAT/POINT,CART,0.0000,5.4267,-3.6780,-1.0000,0.0000,0.0000
MEAS/POINT, F(PT1), 1PTMEAS/CART, 3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
ENDMES
MEAS/POINT, F(PT2), 1PTMEAS/CART, 5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
ENDMES
MEAS/POINT, F(PT3), 1PTMEAS/CART, 59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
ENDMES
MEAS/POINT, F(PT4), 1PTMEAS/CART, 6.4068,0.0000,-3.1056,-0.0000,-1.0000,-0.0000
ENDMES
MEAS/POINT, F(PT5), 1PTMEAS/CART, 60.6298,0.0000,-4.8231,-0.0000,-1.0000,-0.0000
ENDMES
MEAS/POINT, F(PT6), 1PTMEAS/CART, 0.0000,5.4267,-3.6780,-1.0000,0.0000,0.0000
ENDMES
DMESW/COMAND,'D(CRD1) = LOCATE/XYZDIR, XYZAXI, $FA(PT1), ZAXIS, $FA(PT2), ZAXIS, $FA(PT3), ZAXIS, $FA(PT4), YAXIS, $FA(PT5), YAXIS, $FA(PT6), XAXIS'
$$ Set.CAD2PCS.CADM_1

（6）通过复制前面的定义语句到末尾，运行重新定义RPS基准理论值，保持RPS点理论值不变。

（7）精建坐标系

注意：RPS坐标系和基本坐标系建立方法一样

设置安全平面，多点拟合，设定循环次数（根据实际需要）。

定义迭代值（设定循环次数（根据实际需要））

设置最大迭代次数、渐变值，勾选“允许迭代” ，点击"添加/激活坐标系"按钮后，会产生一个MACRO Item添加到程序运行窗口。

(ITR_START)
F(PT1)=FEAT/POINT,CART,3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
F(PT2)=FEAT/POINT,CART,5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
F(PT3)=FEAT/POINT,CART,59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
F(PT4)=FEAT/POINT,CART,6.4068,0.0000,-3.1056,-0.0000,-1.0000,0.0000
F(PT5)=FEAT/POINT,CART,60.6298,-0.0000,-4.8231,-0.0000,-1.0000,0.0000
F(PT6)=FEAT/POINT,CART,0.0000,5.4267,-3.6780,-1.0000,-0.0000,0.0000
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 3.0875, 55.7898, 3.0000
MEAS/POINT, F(PT1), 1PTMEAS/CART, 3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 5.0723, 8.6241, 3.0000
MEAS/POINT, F(PT2), 1PTMEAS/CART, 5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 59.6959, 5.0608, 3.0000
MEAS/POINT, F(PT3), 1PTMEAS/CART, 59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 6.4068, -3.0000, -3.1056
MEAS/POINT, F(PT4), 1PTMEAS/CART, 6.4068,0.0000,-3.1056,-0.0000,-1.0000,0.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 60.6298, -3.0000, -4.8231
MEAS/POINT, F(PT5), 1PTMEAS/CART, 60.6298,-0.0000,-4.8231,-0.0000,-1.0000,0.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, -3.0000, 5.4267, -3.6780
MEAS/POINT, F(PT6), 1PTMEAS/CART, 0.0000,5.4267,-3.6780,-1.0000,-0.0000,0.0000
ENDMESDECL/COMMON, DOUBLE, KNPTR1
DECL/COMMON, CHAR, 256, KNPTC1
KNPTC1 = ASSIGN/CONCAT('坐标系拟合误差=',STR(KNPTR1))DMESW/COMAND,'D(CRD2) = LOCATE/XYZDIR, XYZAXI, $FA(PT1), ZAXIS, $FA(PT2), ZAXIS, $FA(PT3), ZAXIS, $FA(PT4), YAXIS, $FA(PT5), YAXIS, $FA(PT6), XAXIS'
KNPTR1 = ITERAT/(ITR_START), (ITR_FAIL), 0.020000, ABSL, 10,$FA(PT1), 0, 0, 1,$FA(PT2), 0, 0, 1,$FA(PT3), 0, 0, 1,$FA(PT4), 0, 1, 0,$FA(PT5), 0, 1, 0,$FA(PT6), 1, 0, 0
(ITR_FAIL)

（8）模型对齐，通过复制前面的定义语句到末尾，运行重新定义RPS基准理论值，保持RPS点理论值不变，可直接查看RPS基准偏差的图形报告。

SNSET/APPRCH, 2.0000
SNSET/RETRCT, 2.0000
SNSET/DEPTH, 0.0000
SNSET/SEARCH, 10.0000
SNSET/CLRSRF, F(PLN1), 20.0000
(ITR_START)
F(PT1)=FEAT/POINT,CART,3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
F(PT2)=FEAT/POINT,CART,5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
F(PT3)=FEAT/POINT,CART,59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
F(PT4)=FEAT/POINT,CART,6.4068,0.0000,-3.1056,-0.0000,-1.0000,0.0000
F(PT5)=FEAT/POINT,CART,60.6298,-0.0000,-4.8231,-0.0000,-1.0000,0.0000
F(PT6)=FEAT/POINT,CART,0.0000,5.4267,-3.6780,-1.0000,-0.0000,0.0000
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 3.0875, 55.7898, 3.0000
MEAS/POINT, F(PT1), 1PTMEAS/CART, 3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 5.0723, 8.6241, 3.0000
MEAS/POINT, F(PT2), 1PTMEAS/CART, 5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 59.6959, 5.0608, 3.0000
MEAS/POINT, F(PT3), 1PTMEAS/CART, 59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 6.4068, -3.0000, -3.1056
MEAS/POINT, F(PT4), 1PTMEAS/CART, 6.4068,0.0000,-3.1056,-0.0000,-1.0000,0.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, 60.6298, -3.0000, -4.8231
MEAS/POINT, F(PT5), 1PTMEAS/CART, 60.6298,-0.0000,-4.8231,-0.0000,-1.0000,0.0000
ENDMES
$$ CALL/M(EASI_CLEARPLN_GOTO), 0, -3.0000, 5.4267, -3.6780
MEAS/POINT, F(PT6), 1PTMEAS/CART, 0.0000,5.4267,-3.6780,-1.0000,-0.0000,0.0000
ENDMESDECL/COMMON, DOUBLE, KNPTR1
DECL/COMMON, CHAR, 256, KNPTC1
KNPTC1 = ASSIGN/CONCAT('坐标系拟合误差=',STR(KNPTR1))DMESW/COMAND,'D(CRD2) = LOCATE/XYZDIR, XYZAXI, $FA(PT1), ZAXIS, $FA(PT2), ZAXIS, $FA(PT3), ZAXIS, $FA(PT4), YAXIS, $FA(PT5), YAXIS, $FA(PT6), XAXIS'
KNPTR1 = ITERAT/(ITR_START), (ITR_FAIL), 0.020000, ABSL, 10,$FA(PT1), 0, 0, 1,$FA(PT2), 0, 0, 1,$FA(PT3), 0, 0, 1,$FA(PT4), 0, 1, 0,$FA(PT5), 0, 1, 0,$FA(PT6), 1, 0, 0
(ITR_FAIL)$$ Set.CAD2PCS.CADM_1F(PT1)=FEAT/POINT,CART,3.0875,55.7898,0.0000,0.0000,0.0000,1.0000
F(PT2)=FEAT/POINT,CART,5.0723,8.6241,0.0000,0.0000,0.0000,1.0000
F(PT3)=FEAT/POINT,CART,59.6959,5.0608,0.0000,0.0000,0.0000,1.0000
F(PT4)=FEAT/POINT,CART,6.4068,0.0000,-3.1056,-0.0000,-1.0000,0.0000
F(PT5)=FEAT/POINT,CART,60.6298,-0.0000,-4.8231,-0.0000,-1.0000,0.0000
F(PT6)=FEAT/POINT,CART,0.0000,5.4267,-3.6780,-1.0000,-0.0000,0.0000$$ Set.ViewGraphicalReport.Report1
$$ Set.SaveGraphicalReport.Report1

举例如下：

1.按照图纸RPS元素要求，定义出理论元素（按照图面修改元素名为：RPS1、RPS2、RPS3、RPS4、RPS5）

（1）定义RPS理论元素

通过图纸知道，RPS1是键槽，RPS2是圆，这两个元素都可以直接从CAD上选取理论元素；选取元素后重命名元素：RPS1、RPS2；
RPS3、4、5都是点元素，表C中只给了XYZ坐标值，可直接定义出理论点（从图A中确定IJK为0，0，1）

2.生成手动DMIS程序

拖放RPS元素生成测量命令，注意圆和键槽元素需要使用“向量创建”；

3.运行手动DMIS程序

运行DMIS手动程序，按顺序测量得到测量值（测量点元素时，大致测量在对应位置即可），得到元素实测值。

4.设置“多点拟合坐标系”：拖入RPS元素，根据图2的要求勾选各RPS元素控制的方向；

5.通过坐标系命令，点击下图中红框处切换到迭代值参数设置，定义迭代值：设置最大迭代次数、渐变值，勾选“允许迭代” ；

6.勾选“更新理论值”，拟合，添加/激活坐标系，产生DMIS语句，模型对齐；

7.通过复制前面的定义语句到末尾，运行重新定义RPS基准理论值，可直接查看RPS基准偏差的图形报告。

使用RPS基准点系统检测汽车零部件，可以减少因测量基准不统一而产生的误差；而巧妙应用RationalDMIS“多点拟合坐标系配置”，可以在保证满足RPS基准点要求的同时，最好程度的去对齐车身坐标系。

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RationalDMIS 2020 RPS坐标系

操作方法如下；

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