In order to improve the process precision of an XY laser annealing table, a geometric error modeling, and an identification and compensation method were proposed. Based on multi-body system theory, a geometric error m...In order to improve the process precision of an XY laser annealing table, a geometric error modeling, and an identification and compensation method were proposed. Based on multi-body system theory, a geometric error model for the laser annealing table was established. It supports the identification of 7 geometric errors affecting the annealing accuracy. An original identification method was presented to recognize these geometric errors. Positioning errors of 5 lines in the workspace were measured by a laser interferometer, and the 7 geometric errors were identified by the proposed algorithm. Finally, a software-based error compensation method was adopted, and a compensation mechanism was developed in a postprocessor based on LabVIEW. The identified geometric errors can be compensated by converting ideal NC codes to actual NC codes. A validation experiment has been conducted on the laser annealing table, and the results indicate that positioning errors of two validation lines decreased from ±37 μm and ±33 μm to ±5 μm and ±4.5 μm, respectively. The geometric error modeling, identification and compensation method presented in this work can be straightforwardly extended to any configurations of 2-dimensional worktable.展开更多
为了在准确测量给水硬度的前提下节约试剂,以煤粉工业锅炉的给水为对象,首先取样给水100 m L,研究了氨缓溶液和铬黑T指示剂的用量对给水硬度测量结果的影响;然后分别取样给水100、50、25 m L,对比了取样体积和试剂用量对给水硬度测量结...为了在准确测量给水硬度的前提下节约试剂,以煤粉工业锅炉的给水为对象,首先取样给水100 m L,研究了氨缓溶液和铬黑T指示剂的用量对给水硬度测量结果的影响;然后分别取样给水100、50、25 m L,对比了取样体积和试剂用量对给水硬度测量结果的影响。结果表明:氨缓溶液和铬黑T指示剂的用量对给水硬度测量结果没有影响;给水取样50 m L时,测量得到的硬度值与取样100 m L时基本相同,但给水取样25 m L时测量误差较大。因此,从节约试剂的角度出发,测量给水硬度时建议取样给水50 m L、使用1 m L氨缓溶液和1滴铬黑T指示剂。展开更多
为了在准确测量锅水碱度的前提下节约试剂,以煤粉工业锅炉的锅水为对象,研究了试剂用量和锅水取样体积对锅水碱度测量结果的影响。首先取样锅水100 m L,研究了酚酞和甲基橙试剂的用量对酚酞碱度和全碱度测量结果的影响;然后分别取样锅水...为了在准确测量锅水碱度的前提下节约试剂,以煤粉工业锅炉的锅水为对象,研究了试剂用量和锅水取样体积对锅水碱度测量结果的影响。首先取样锅水100 m L,研究了酚酞和甲基橙试剂的用量对酚酞碱度和全碱度测量结果的影响;然后分别取样锅水100、50、25 m L,对比了取样体积和试剂用量对锅水碱度测量结果的影响。结果表明:酚酞和甲基橙试剂用量不同会导致溶液颜色不同,但对锅水碱度测量结果没有影响;锅水取样50 m L时,测量到的锅水碱度值与取样100 m L时基本相同,但锅水取样25 m L时测量误差较大。因此,从节约硫酸标准溶液和试剂的角度出发,测量锅水碱度时建议取样50 m L锅水、使用1滴酚酞试剂和1滴甲基橙试剂。展开更多
基金Projects(2012ZX04010-011,2009ZX02037-02) supported by the Key National Science and Technology Project of China
文摘In order to improve the process precision of an XY laser annealing table, a geometric error modeling, and an identification and compensation method were proposed. Based on multi-body system theory, a geometric error model for the laser annealing table was established. It supports the identification of 7 geometric errors affecting the annealing accuracy. An original identification method was presented to recognize these geometric errors. Positioning errors of 5 lines in the workspace were measured by a laser interferometer, and the 7 geometric errors were identified by the proposed algorithm. Finally, a software-based error compensation method was adopted, and a compensation mechanism was developed in a postprocessor based on LabVIEW. The identified geometric errors can be compensated by converting ideal NC codes to actual NC codes. A validation experiment has been conducted on the laser annealing table, and the results indicate that positioning errors of two validation lines decreased from ±37 μm and ±33 μm to ±5 μm and ±4.5 μm, respectively. The geometric error modeling, identification and compensation method presented in this work can be straightforwardly extended to any configurations of 2-dimensional worktable.
文摘为了在准确测量给水硬度的前提下节约试剂,以煤粉工业锅炉的给水为对象,首先取样给水100 m L,研究了氨缓溶液和铬黑T指示剂的用量对给水硬度测量结果的影响;然后分别取样给水100、50、25 m L,对比了取样体积和试剂用量对给水硬度测量结果的影响。结果表明:氨缓溶液和铬黑T指示剂的用量对给水硬度测量结果没有影响;给水取样50 m L时,测量得到的硬度值与取样100 m L时基本相同,但给水取样25 m L时测量误差较大。因此,从节约试剂的角度出发,测量给水硬度时建议取样给水50 m L、使用1 m L氨缓溶液和1滴铬黑T指示剂。
文摘为了在准确测量锅水碱度的前提下节约试剂,以煤粉工业锅炉的锅水为对象,研究了试剂用量和锅水取样体积对锅水碱度测量结果的影响。首先取样锅水100 m L,研究了酚酞和甲基橙试剂的用量对酚酞碱度和全碱度测量结果的影响;然后分别取样锅水100、50、25 m L,对比了取样体积和试剂用量对锅水碱度测量结果的影响。结果表明:酚酞和甲基橙试剂用量不同会导致溶液颜色不同,但对锅水碱度测量结果没有影响;锅水取样50 m L时,测量到的锅水碱度值与取样100 m L时基本相同,但锅水取样25 m L时测量误差较大。因此,从节约硫酸标准溶液和试剂的角度出发,测量锅水碱度时建议取样50 m L锅水、使用1滴酚酞试剂和1滴甲基橙试剂。
