ch7 - Chuong 7 ' ' ' ^' ^ ^ ' KIEM TRA CHAT LU'ONG SAN PHAM...

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Ch ’u ’ong 7 KI ˆ EM TRA CH ´ ˆ AT L U . ONG S AN PH ˆ AM Trong m ˜ ˆoi qu´a tr` ınh s an xu ´ ˆat th ’u ` ong c´o s ’u . thay ¯ d ˆoi gi ˜ ’ua c´ac s an ph ˆam gˆay ra t´ac ¯ o . ng x ´ ˆau lˆ en ch ´ ˆat l ’u ’ o . ng c ua s an ph ˆam. S ’u . thay ¯ d ˆoi n`ay c´o th ˆ e ¯ d ’u ’ o . c gˆay nˆ en b oi s ’u . s ’u h ’u h ong c ua m´ay m´oc, ch ´ ˆat l ’u ’ o . ng x ´ ˆau c ua nguyˆ en liˆ e . u thˆo cung c ´ ˆap cho s an xu ´ ˆat, ph ` ˆan m ` ˆ em qu an l´y khˆong ch´ ınh x´ac ho˘ a . c do sai l ` ˆam c ua con ng ’u ` oi khi ¯ di ` ˆ eu khi ˆ en qu´a tr` ınh. Viˆ e . c nhˆa . n bi ´ ˆ et khi n`ao th` ı qu´a tr` ınh ¯ di ra ngo`ai s ’u . ki ˆ em so´at ¯ d ’u ’ o . c x´ac ¯ di . nh b oi bi ˆ eu ¯ d ` ˆo ki ˆ em so´at . Bi ˆ eu ¯ d ` ˆo n`ay ¯ d ’u ’ o . c x´ac ¯ di . nh b oi hai gi´a tri . : gi ´ oi ha . n ki ˆ em so´at d ’u ´ oi LCL ( lower control limit ) v`a gi ´ oi ha . n ki ˆ em so´at trˆ en UCL ( upper control limit ). D ˜ ’u liˆ e . u s an xu ´ ˆat ¯ d ’u ’ o . c chia th`anh nh ˜ ’ung nh´om con v`a th ´ ˆong kˆ e c ua nh´om con, nh ’u trung b` ınh nh´om con v`a ¯ dˆo . e . ch tiˆ eu chu ˆan nh´om con. Khi th ´ ˆong kˆ e nh´om con khˆong r ’ oi v`ao gi ˜ ’ua gi ´ oi ha . n ki ˆ em so´at d ’u ´ oi v`a gi ´ oi ha . n ki ˆ em so´at trˆ en th` ı ta k ´ ˆ et luˆa . n qu´ a tr` ınh ¯ di ra ngo`ai ki ˆ em so´at . 1. BI ˆ EU D ¯ ` ˆ O KI ˆ EM SO ´ AT CHO GI ´ A TRI . TRUNG B ` INH 1.1 Tr ’u ` ’ong h ’o . p bi ´ ˆ et μ v` a σ Gi a s ’u khi qu´a tr` ınh trong s ’u . ki ˆ em so´at c´ac s an ph ˆam liˆ en ti ´ ˆ ep ¯ d ’u ’ o . c s an xu ´ ˆat ra c´o c´ac ¯ a . c tr ’ung s ´ ˆo ¯ do ¯ d ’u ’ o . c l`a ¯ da . i l ’u ’ o . ng ng ˜ ˆau nhiˆ en chu ˆan, ¯ dˆo . c lˆa . p v ´ oi trung b` ınh μ v`a ph ’u ’ ong sai σ 2 . Tuy nhiˆ en, v` ı mˆo . t t` ınh hu ´ ˆong ¯ a . c biˆ e . t n`ao ¯ o qu´a tr` ınh ¯ di ra ngo`ai s ’u . ki ˆ em so´at v`a b ´ ˘ at ¯ d ` ˆau s an xu ´ ˆat ra s an ph ˆam c´o phˆan ph ´ ˆoi kh´ac. Ta c ` ˆan nhˆa . n bi ´ ˆ et khi n`ao th` ı ¯ di ` ˆ eu n`ay x’ay ra ¯ d ˆ e ng ` ’ung qu´a tr` ınh, t` ım ra s ’u . c ´ ˆo v`a kh ´ ˘ ac phu . c n´o. Gi’a s ’u X 1 ,X 2 ,... l`a c´ac ¯ a . c tr ’ung ¯
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This note was uploaded on 01/18/2012 for the course INFORMATIK 2011 taught by Professor Phanthuongcang during the Winter '11 term at Cornell University (Engineering School).

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ch7 - Chuong 7 ' ' ' ^' ^ ^ ' KIEM TRA CHAT LU'ONG SAN PHAM...

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