Uncertainty evaluation for measurements of peak-to-valley surface form errors

CIRP Annals ◽  
2008 ◽  
Vol 57 (1) ◽  
pp. 509-512 ◽  
Author(s):  
Chris J. Evans
Keyword(s):  
Uncertainty Evaluation ◽  
Surface Form ◽  
Form Errors

scholarly journals Uncertainty Evaluation for Measurements of Pitch Deviation and Out-of-Flatness of Planar Scale Gratings by a Fizeau Interferometer in Littrow Configuration

2018 ◽  
Vol 8 (12) ◽  
pp. 2539 ◽  
Author(s):  
Xin Xiong ◽  
Yuki Shimizu ◽  
Xiuguo Chen ◽  
Hiraku Matsukuma ◽  
Wei Gao
Keyword(s):  
Uncertainty Analysis ◽  
Evaluation Method ◽  
Uncertainty Evaluation ◽  
Surface Form ◽  
Fizeau Interferometer ◽  
Form Errors ◽  
Final Measurement ◽  
Pitch Deviation ◽  
Littrow Configuration

Form errors of a planar scale grating, such as pitch deviations and out-of-flatness, are major contributors to the final measurement uncertainty of an interferential scanning-type planar encoder. Following the previous work, in which a method has been proposed to evaluate both the out-of-flatness and the pitch deviations of a planar scale grating by a Fizeau interferometer in Littrow configuration, uncertainty analysis on this method is performed in this paper. Theoretical equations are derived to make quantitative uncertainty analysis while taking possible error factors into account. To overcome the drawbacks of a traditional uncertainty matrix approach, a new procedure is proposed to evaluate the uncertainty in the PV (peak-to-valley) deviation of a surface form, so as to assure the quality of measurement. Experiments are finally conducted to demonstrate the feasibility of proposed uncertainty evaluation method.

Efficient Algorithms for Calculations of the Maximum Surface Form Errors in Peripheral Milling

2007 ◽  
Vol 10-12 ◽  
pp. 757-761
Author(s):  
Yong Gang Kang ◽  
Zhong Qi Wang ◽  
J.J. Wu ◽  
Cheng Yu Jiang
Keyword(s):  
Finite Element ◽  
Iterative Algorithm ◽  
Element Model ◽  
Surface Form ◽  
Peripheral Milling ◽  
Maximum Surface ◽  
Form Errors ◽  
Thin Walled ◽  
Dimensional Errors ◽  
Key Techniques

An efficient flexible iterative algorithm with a general approach is presented for calculations of surface form errors in peripheral milling of thin-walled workpiece. An efficient finite-element model for tool/workpiece is presented to analyze the surface dimensional errors in peripheral milling of aerospace thin-walled workpieces. The efficient flexible iterative algorithm is proposed to calculate the deflections and the maximum surface form errors as contrasted with the rigid iterative algorithm used in the literatures. Meanwhile, some key techniques such as the finite-element modeling of the tool-workpiece system; the determinant algorithm to judge instantaneous immersion boundaries between a cutter element and the workpiece; iterative scheme for the calculations of tool-workpiece deflections considering the former convergence cutting position are developed and the method for calculating the position and magnitude of the maximum surface form errors are developed and presented in detail. The proposed approach is validated and proved to be efficient through comparing the obtained numerical results with the test results.

Systematic Simulation Method for the Calculation of Maximum Deflections in Peripheral Milling of Thin-Walled Workpieces with Flexible Iterative Algorithms

2014 ◽  
Vol 909 ◽  
pp. 185-191 ◽  
Author(s):  
Yong Gang Kang ◽  
Guo Rong Yang ◽  
Jie Huang ◽  
Jing Hang Zhu
Keyword(s):  
Iterative Algorithms ◽  
Simulation Method ◽  
Milling Process ◽  
Fe Model ◽  
Surface Form ◽  
High Complexity ◽  
Peripheral Milling ◽  
Form Errors ◽  
Simulation Procedure ◽  
Thin Walled

Due to the deflection of tool and workpiece induced by cutting force, there is a high complexity associated with the prediction of surface form errors in the peripheral milling process of thin-walled workpieces. And the prediction of surface form errors induced by cutting deflection is the precondition for process optimization and error compensation. This paper proposes a systematic simulation procedure suitable for surface form errors prediction in peripheral milling of low rigid thin-walled workpiece. Some key algorithms with the judgment of contacts between the cutter and the workpiece, the flexible iterative algorithm as well as the tool/workpieces deflection prediction using FE model are developed and presented in detail. Comparisons of the form errors and cutting forces obtained numerically and experimentally confirm the validity of the proposed algorithms and simulation procedure.

Uncertainty evaluation of the static expansion system and its long-term stability at NMIJ

Vacuum ◽  
2021 ◽  
pp. 110034
Author(s):  
Yoshinori Takei ◽  
Hajime Yoshida ◽  
Eiichi Komatsu ◽  
Kenta Arai
Keyword(s):  
Uncertainty Evaluation ◽  
Term Stability ◽  
Long Term Stability ◽  
Expansion System

scholarly journals Uncertainty Evaluation of the Electrical Transient Rise Time

2021 ◽  
Vol 1826 (1) ◽  
pp. 012103
Author(s):  
Pedro Oliveira Costa Machado Neto ◽  
Paulo Cesar Ramalho Brandão ◽  
Juan Carlos Mateus Sanchez ◽  
Lúnia Coelho de Almeida de Lima ◽  
Carlos Eduardo Cardoso Galhardo
Keyword(s):  
Rise Time ◽  
Uncertainty Evaluation ◽  
Transient Rise
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