NGHIEN cufu - TRAO DOI Ufng dung he than kinh nhdn tao qud trinh uon cong thep tdm bdng nhiet cam ufng ' Ks Tran Ihi Thuy Nga, ^PGS I S Tran Thu Ha, 'TS Nguyen TrUdng Thinh 'Cao ding Ky thuat Cao I bang, TR Hd Chi Minh Dai hgc SU pham Ky thuat TPHd Chi Minh TOM TAT Cng dung mgng thdn kinh nhdn tgo ggi tdt la ANN (artificial neural network) vdo phUdng phdp gia nhiet cdm dng nhdm dii dodn tga diidng nhiet (heating-line) vd cdc tham so nhiet detgo hinh thep tdm theo hinh ddng mong muon mgt cdch de ddng hdn Vdi mo hinh ndy cdn cd tham sd nhap Id hinh dgng ban ddu cua tdm thep (gid tri nhap Id sii dfch chuyen theo phiidng ddng cua diem) vd tham sd xudt Id vi tri diidng nhiet cdm dng dUdc liia chgn Cdc mdu hudn luyen cho ANN bang phiidng phdp phdn tich thu dUdc cho thdy cd the dU bdo dddc sii bien dgng cua tdm thep Trong gia nhiet cdm dng dd thd nghiem md hinh ANN dung dcxdc dinh vi tri dUdng nhiet tren be mat tdm thep tgo hinh cho ket qud khd khd quan ABSTRACT 77t/5 paper presents the development of an artificial neural network model for the prediction of heating-line positions in induction heating process This model help shipyard manufacturers determine the positions of induction heating lines and their heating parameters to form a desired shape ofplate The vertical displacements of plate have been considered as the input parameters and the selected induction heating lines as output parameters to develop the model The training patterns of neural network are obtained using an analytical solution that p"cdict: plate dcfcrir.ations in induction heating process The developed neural network model is tested to show its feasibility to determine the heating positions on the surface of aflat steel plate in the line heating process for forming a desired shape % TAP CHI CO KHI VIET NAM - - 35 1 46 46 SS 67 • S7 36 r p — ^s — ' — -(• 47 ,16 i^^ 37 38 A , 48 [se 59 ^60 29 39 \40 -f- ,h 49 SO j 161 162 t • ,68 ^69 ^ • • t ,83 70 43 52 53 54 63 64 65 I 72 ' J"* 1/ 7® l84 SS , 86 87 97 98 '73 T " 78 [73 80 f.31 82 89 190 m 32 93 94 95 96 103 104 105 106 107 ^ 108 , ^109 ^ 100 I 101 J02 111 ^113 112 \l14 IffS 33 ' 88 ^ SU- • U i ^ JIL^ J^ 121 7000 ^ lOOx 100 Hinh Sd cdc diem nut cho mo hinh ANN Hinh Sd diidng nhiet cdm dng cho md hinh ANN Mdt sd nhflng khau quan trgng nhat nghien cflu ANN la xac dinh cau true mang tdi flu, lien quan den sd Ifldng cac ldp an va nd ron nd Sd Ifldng nd ron cac ldp an dflgc xac dinh qua chay thfl va phfldng phap tiep can ldi, nham dieu tiet cac ldi ddng quy Trong nghien cflu nay, cau trflc tdi flu cua mang than kinh dat dfldc bang each thfl sd ldp an va nd ron khac Cau true ANN bao gdm - ldp an vdi cac nd ron khac ldp an dfldc kiem tra Thfl nghiem khdi ddng ldp an vdi 50 noron, va chinh xac cua gia tri dii doan da dfldc kiem tra trfldc cau true tdiflucua mang ANN lfla chgn Muc tieu de tang den mflc tdi da chinh xac nham dat dfldc mang ANN the he tdt nhat Sau thfl nghiem, thay rd sfl gia tang Iflgng nd ron dung ldp an khdng he giup cai tien mang, ldp an ddn cho ddng quy tdt hdn ldp an dfl doan dfldng Dfl doan nhiet cam flng dat chinh xac cao nhat sfl dung mang vdi ldp an cd 160 nd ron Nhfl vay, nhieu nd ron ldp an khdng dam bao cho viec giam cac ldi thfl nghiem binh thfldng hay giup lam tang chinh xac Diia tren phan tich dd, cau true tdiflucua ANN dfldc tao lap la 121-160-112 flng vdi dfl lieu nhap, noron ldp an va sd dfl lieu xuat Md hinh cd cau true sau: cr= TAP CHI CO KHI VIET NAM • S d l l (Thang 11 nam 2011) NGHIEN cufu-TRAO D | Ifldng d 0.8 Huan luyen dfldc thiic hien chd den dai 10000 lan va sai sd la 0,0001 Tai thdi diem bat dau huan luyen, ANN khdi ddng khdi Ifldng mang vdi I tap hdp nhd cac gia tri ngau nhien theo Nguyen - Widrow [4] Trong sudt mdi vdng lap, mang nhan dfldc I ma tran trgng Sau do, he thdng tinh tdng cac sai sd binh sd Dii lieu huan luyen vdi 1.200 man cd so du' lieu, dua tron moi quan lie gifla cac hinh phfldng gifla dau mong mudn va dau thtfc dang khac cua taim vii vi tri dfldng nhiet te cua mang Dung chenh lech cua tdng nhap vao cam flng, cung nhfl \an ldc \'a be mat nhiet cua trgng sd mang de sai sd nhd hdn mdi vdng chung, dugc chia ngau nhien bd thdng lap tiep theo Do chinh xac cua md hinh trien ke: huan luyen xa kiem tra Trong dd 800 dfl lieu khai phu thudc vao cac trgng sd Huan luyen dflgc dung cho huan luyen \-i\ 400 cho kiem tra ket thuc tdng cac sai sd binh phfldng dfldi Dich chincii thang theo true / tai cac diem tren ngfldng cho phep, dat dfldc trgng sd tdiflu.Mat tam thep dflgc tinh loan nhfl dfl lieu nhap theo den vai gid cho xfl li toan hgc huan luyen cdng thflc (1), Trong trfldng hdp nay, mang than de thu dugc trgng sd tdi flu va gia tri sai lech kinh huain luyen, co sd dfl lieu dflgc su dung Tuy nhien, chi mat cd vai giay de thflc hien mo ngau nhien de xac dinh gia tri trgng sd va biased phdng Day la kha nang vfldt trdi cua mang Ti le hgc hdi dflgc dinh d mflc 0.2 va he sd ddng ANN cdng tac dfl doan - Sd Ifldng nd ron ldp nhap = , - Sd Ifldng ldp an = Sd Iflgng nd ron ldp an = 160 Sd chu ki huan luyen = 10.000 So Iflgng nd ron ldp xiuil = 112 ^ ^ ^1 ** 111,' i IJ -10 -'00 I ^ 1 y* 1 / 1 1 t i,» ^ s , » 1V- 1 1/ l 1 ,' iP-i ^—i_-j ~ y^ "f "1 r- , * r w r -r - i yf/ i 1 *'1 ^ 1 l / I X ^f-^ f , ^_, ^ f _ y ^ _ ^ _ v^?&! to fy 1 •''?5^ -^- -500^ i - - * i -1 t- - -jl-i_-i i in 1 r» 500 i.'l4 l '- J ^ ' ' ' ""His ,*r 7—1—r>r-T r—i-^-^r; i •500 y dKis # • - - • (a) Tdm bien dgng mong mudn » Front surface heat line V = tn/s Back surface heat line V = 10 m/s V = 20m/s V = 15 m/s (b) Du dodn dudng nhiet vd cdc tham sd Hinh DU lieu nhdp va xudt tntdng hdp cu the Tfl hinh dang tam mong mudn cd chuyen vi dflng cua cac diem minh hga hinh 8a Gia tri cua chflng dxiac Iflu gifl tai vec td nhap de md phdng ANN, sau md phdng ket qua cho sd dfldng nhiet vdi cac gia tri hoac (thfldng sd dfldng nhiet it hdn 28) dfldc ve lai tren tam nhfl hinh 8b , cac dfldng cham bieu hien nhiet cam flng d tren mat sau cua tam, va cac dudng lien d mat trfldc Dau tien cac tham sd nhiet cua 28 dfldng dfldc kiem tra, tham sd dfldng nhiet dii TAP CHI CO KHI VIET NAM