I KHOA HQC - CONG NGHJ UfNG DUNG MANG NOlRON TRONG CHUAN OOAN TRANG THAI KY THUAT BONG COf DIESEL T A U THUY TS OONG VAN HUdNG Trtfdng D9I hgc GTVT TP Hi Chi Minh Tdm tUt: Chuin aoin ky thu$t, atf bio stf d phtfc vtf cho viic Idem tra, khai thic an toin dc h$ thing agng Itfc tiu thup Ii nhiim vg hit stfc quan trgng Viic xiy dtfng dc mo hinh dinh gii, chin ddn vi dtfbio "thing minh " hdn Ii phd hgp vdi xu thi Chung cua kythu$tSuf dung m9ng neuralnhin (90 dixiy dtfng dc mi hinh nhin d^ng vi chuin ddn ky thu$t Oang autfc Ung dung nhuli giil phip tin dV' Bii vlit xiy dtfng mi hinh m^ng neural p/igc vy cho ainh gii trgrtg thii vi chin Odn stfdaing cd aiesel tiu thdy Diy Ii mi hinh mdi cd thi dip Ung augc tOiQng vin Oi thtfc tiin xay qd trinh v$n hinh, tii, sCra chffa tren dc tiu thuy dng suit Idn, d hinh Mnh dng tic Oil ngiy trin biin, gip phin aim bio stf ho0t Oing an toin, tin dy ctia hi aing Itfc tiu thuy Abstract: Technical diagnosis and problems forecast In ship dynamics system Inspection and sate operation Is very neccesray The development of evaluation model and more "Intelligent" diagnosis Is consistent with general techniques Using artificial neural networks to set up the Identification model and diagnostic techniques are being applied as a rellabte solution This article has developed neural network model tor state assessment and marine diesei engines diagnostic This model can apply for practical proltlwns occur during operation, maintenance and repair on large-capacity ships which have long fourrteys at sea, ensuring operatlortal safety and r^lablllty of ttte ship dynamics system B i i toin dinh g i i trgng t h i i Cdng tic dinh g i i trgng thii thgc cua mdt hO thdng dldu khidn t i rit c i n thidt, gidp cho qui trinh khai thic, vin hanh va didu khidn hdttidngdupc tdi Uu MOt hO thdng didu khidn cd qui trinh dinh gii trgng thii cda cic sd tlOu dua vio se giup giim thilu ding kd sal sdt qui trinh didu khiln tim cho ehdt lupng tdng thd cda hd thdng didu khidn ning tdn Cd nhidu phuong phip dinh gid trgng thai, b i i vidt niy chung tdl sd dgng phuong phip binh phuong cgc tidu (least squares).Ndi dung cOa phUOng phip niy t i cic tfn hl$u v i o dd danh gii cic tfn hi$u bj mdt (chua bidt) ho$c sal sd cao d l cho mdt bd tfn hlOu dldu khidn phd hop nhit (best fit) Gpi Z =[z-|, zg, -, ZnV t i mdt vector chda n tfn hidu cda mdt h i thdng, Z j t i cic g i i trj dung (nhUng chua doge bidt) Trong cic hd thdng v i t ly chung ta ludn bidu didn Z j theo vector chUa eic ngudn kleh thfeh X dd tgo tfn hlOu Z thdng qua mdt ma tr$n lien kdtH nhu sau: ZT = H*X (1) Trong dd: Z j la vector cdp n, X I i vector cdp m U ma tran H cd kfch thudc la nxm Ndu gpi E la vector chda cic gia tri sai sd, dd ta ed the vidt: Z = ZT+E Khidd: E = Z - Z T = Z - H * X (2) (3) Thdng thudng g i i trj chlnh xac cda ngudn kk^ thfch X khdng thd xac djnh dupe m i chung ta cd th^ danh gii dUpe (gii trj danh g i i ta gpi la X ) ; tde niy g i i trj sal s6 dupe dinh gii E se t i : E=z-H-X (4) H* X dupe gpi t i ^ p gia trj danh g i i cda tip tfn hlOu Z Khi dd chung ta cd ttid vIet: E=Z-Z=Z-H'X = E - H * i^ -X) (5) Chung ta cd thd xac djnh gii trj dinh gii X ttieo cic ChT tidu dinh g i i E va Z ddng phUdng phip binh phUdng epe tilu thdng qua him f dupe djnti nghTa t i : 1=1 Trong dd e, ta c i c g i i trj sai sd Ung vdi tfn hlOu thd i D l t i n g k h i nang danh g i i chiing ta cd thd difa t h i m v i o cac g i i trj trpng sd Wj Khi dd h i m myc tiiu cda phUPng phap cgc t i l u binh phuong sal sd xic dinh bdi: NhlOm vy cda b i i t o i n tidp theo t i chung ta dl tlm g i i tri nhd n h i t cda h i m f duoc cho bdi cdng thdc (7) theo c i c bidn ' ^ i Dldu kiOn dd h i m f dgt cgc tilu I i : df I =0 /m dX|j m = B'-b' ' ' 2{Ha-H,) Phuong trinh bidn dgng dupc giil theo phuong phip sal phdn, phuong trinh sai phin cd dgng: V| tri hb (m) Hs(m) Tp{a) Gdc hop (