Research Papers

Diagnosing Multistage Manufacturing Processes With Engineering-Driven Factor Analysis Considering Sampling Uncertainty

[+] Author and Article Information
Jian Liu

Department Systems and Industrial Engineering,
The University of Arizona,
Tucson, AZ 85721
e-mail: jianliu@email.arizoan.edu

Jionghua Jin

Department Industrial and Operations Engineering,
The University of Michigan,
Ann Arbor, MI 48109
e-mail: jhjin@umich.edu

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received December 7, 2012; final manuscript received May 15, 2013; published online July 17, 2013. Editor: Y. Lawrence Yao.

J. Manuf. Sci. Eng 135(4), 041020 (Jul 17, 2013) (9 pages) Paper No: MANU-12-1359; doi: 10.1115/1.4024661 History: Received December 07, 2012; Revised May 15, 2013; Accepted May 17, 2013

A new engineering-driven factor analysis (EDFA) method has been developed to assist the variation source identification for multistage manufacturing processes (MMPs). The proposed method investigated how to fully utilize qualitative engineering knowledge of the spatial variation patterns to guide the factor rotation. It is shown that ideal identification can be achieved by matching the rotated factor loading vectors with the qualitative indicator vectors (IV) that are defined according to spatial variation patterns based on the design constraints. However, the random sampling variability may significantly affect the estimation of the rotated factor loading vectors, leading to the deviations from their true values. These deviations may change the matching results and cause misidentification of the actual variation sources. By using implicit differentiation approach, this paper derives the asymptotic distribution and the associated variance-covariance matrix of the rotated factor loading vectors. Therefore, by considering the effect of sample estimation variability, the variation sources identification problem is reformulated as an asymptotic statistical test of the hypothesized match between the rotated factor loading vectors and the indicator vectors. A real-world case study is provided to demonstrate the effectiveness of the proposed matching method and its robustness to the sample uncertainty.

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Grahic Jump Location
Fig. 1

Illustration of impacts of variation sources on KPCs

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Fig. 2

Matching of estimated SPV with IVs

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Fig. 3

The procedure of EDFA based variation source identification

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Fig. 4

Comparison of standardized SPVs

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Fig. 5

Visualization of estimated SPVs

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Fig. 6

Performance comparison in terms of robustness to sample uncertainty




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