Process adjustment with an asymmetric quality loss function |
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Authors: | Jun Zhang Wei Li Kaibo Wang Ran Jin |
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Affiliation: | 1. The State Key Lab of Fluid Power Transmission and Control, Zhejiang University, Hang Zhou 310027, China;2. Department of Industrial Engineering, Tsinghua University, Beijing 100084, China;3. Grado Department of Industrial and Systems Engineering, Virginia Tech., VA 24061, USA |
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Abstract: | Controlling an engineering process usually focuses on maintaining the process output on-target with minimum variation. Conventionally, the quality loss incurred by the deviation from the nominal values is assumed symmetric. However, in some engineering processes, the penalties incurred by positive and negative deviations of the quality variables are different. In such cases, we need to redesign the controller so that the overall quality loss is minimized. In this work, motivated by a real ingot growing process, a new controller is proposed for an asymmetric quality loss function. Its performance and stability are studied via numerical simulation. The effectiveness of the method is also demonstrated in the real engineering process. |
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Keywords: | Asymmetric quality loss function Ingot manufacturing Manufacturing process control |
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