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�������պ����ѧѧ�� 2006, Vol. 32 Issue (09) :1121-1124    DOI:
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Evaluation on distribution of measured characteristic with asymmetric tolerances
Zhu Wei, Li Yuansheng*
Management School, China University of Mining &Technology (Beijing), Beijing 100083, China

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Abstract�� The quality of a process or product was studied based on the center of the specification interval in the conventional SPC but on target value, which led to inadequate measure of the quality under the condition of asymmetrical tolerances. In terms of this problem, the quality of a process or product was analyzed based on target value when the process was characterized by normal distribution or piecewise normal distribution. Taguchi quality loss function was applied to describe product value. To compare the process-�Qand product-quality for the measured characteristic with the above two distributions, the expected value of product value was given. Results demonstrate that the quality of a process or product for the measured characteristic with piecewise normal distribution is better than that with normal distribution.
Keywords�� tolerance analysis   quality control   target value   normal distribution     
Received 2005-10-27;
Fund:

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About author: ף ΰ(1979-),��,���շ�����,��ʿ��, wwwpd123@163.com.
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ףΰ, ��Ԫ��.�ǶԳ�ƫ������������ֵ�ֲ�����[J]  �������պ����ѧѧ��, 2006,V32(09): 1121-1124
Zhu Wei, Li Yuansheng.Evaluation on distribution of measured characteristic with asymmetric tolerances[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(09): 1121-1124
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