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�������պ����ѧѧ�� 2004, Vol. 30 Issue (04) :391-394    DOI:
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2. ��۳��д�ѧ ���칤���빤�̹���ϵ, ���
Estimating of composite process capability for conceptual process planning
Zheng Lianyu1, Wei Li1, Qian Gui-sheng2*
1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China;
2. Dept. of Manufacturing Engineering and Engineering Management, City University of Hongkong, Hongkong,China

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Abstract�� It is crucial to estimate the process capability of process alternatives selected in the macro-level conceptual process planning during early stage of product development. The classical process capability index is only suitable to estimate micro-level single quality characteristic possessing statisticalnormal distribution in batch production scenario. Based on the idea of estimating the inputs (process elements) performance rather than the outputs (quality characteristics) ones of manufacturing system, a generic function for measuring the capability of process element was put forward and then the estimation formula of composite process capability index was developed. This index was able to measure the whole quality level of a manufacturing system with multiple process elements and multiple quality characteristics. A case study concerned with conceptual process planning for a spacecraft frame part was used to illustrate the validity of the estimation formula of composite process capability. The proposed composite process capability index was used as a effective tool to approximately estimate and select the optimal process alternatives during conceptual process planning in the early stage of product development.
Keywords�� quality   quality controls   process capability   process planning   product development   concurrent engineering     
Received 2003-11-15;
About author: ֣����(1967-),��,�����ϲ���,������, lyzheng@buaa.edu.cn.
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֣����, κ��, Ǯ����.��Ҫ��������е��ۺϹ����������㷽��[J]  �������պ����ѧѧ��, 2004,V30(04): 391-394
Zheng Lianyu, Wei Li, Qian Gui-sheng.Estimating of composite process capability for conceptual process planning[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2004,V30(04): 391-394
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http://bhxb.buaa.edu.cn//CN/     ��     http://bhxb.buaa.edu.cn//CN/Y2004/V30/I04/391
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