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Estimation of Nonstationary Process Variance in Multistage Manufacturing Processes Using a Model Based Observer

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Figure 2. Stationary process variance estimation of σ 2 v (υ 4 = 0.05) in the single-stage assembly process
Figure 6. Process variance estimation with a model-based observer (Υ 2 = 0.05 I 4 ) in the single-stage assembly process affected by an abrupt fault in σ 2 v
Figure 8. Comparison of the performance of different observers used in the single-stage assembly process for the estimation of σ 2 u [1] in fault-free scenarios.
Figure 10. Process variance estimation with a model-based observer (Υ 2 = 0.002 I 9 ) in the multistage assembly process affected by an abrupt fault in σ 2 u [6].

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