Tối ứu kết cấu tàu vỏ thép bằng giải thuật di truyền

NGHIEN cufu-TRAO£)6l / T | li'u KET CAU TAU V6 THEP BANG GIAI THUAT Dl TRUYEN OPTIMIZATION OF STEEL SHIP STRUCTURES BY GENETIC ALGORITHM ThS Pham Ba Linh Trfldng Dai hpc Nha Trang Trong thiit kiket cdu tdu vo thep hien thudng tinh theo quy pham, ngifdi thiet ke thudn gid thiit trUdc cdc kich thUdc cda kit cdu vd tiin hdnh kiem tra theo cdc yeu cdu Tuy phUdngp ndy ddn gidn, nghiim ngat nhUng kit cdu thdn tdu dUdc thiit ke chUa d dang toi Uu Tren cd sd thuat dt truyen, bdi bdo trinh bdy ket qud nghien cdu thiit ke tdi Uu kit cdu tdu vo thep nham tiit kiem vdt li$u, gidm lUOng kit cdu qua co the ndng cao tinh nang hdng hdi ciia tdu Tii khda: Toi Uu hoa, gidi thudt di truyen, kit cdu, xdc sudt dot biin, xdc sudt lai ghep ABSTRACT In the structural design, steel ship strutures are now commonly calculated regularity Des usually predefine the parameters of the structure and conduct inspection according to the requirem This method is simple and strict but the designed structure is not in optimal shape Base on the genetic, the optimal structural of steel ship was found to save materials, reduce structural weigh which can improve features of maritime vessels Keywords: Optimization, genetic algorithm, ship structures, probability of mutation, probability of crossover ^ ISSN 0866 - 7056 TAP CHi CO KHf VI|T NAM, Sd 11 nam 2014 www.cokhivietnam.vn NGHIEN cufu-TRAO D6I muc tieu Z cd thl la trpng Ifldng, gia thdnh cua ket cau, cac ham rang budc cd the la ve dd ben, dp cflng, dp 6n dinh hoac di^u kien can bang cua ket cau, cdn x'^^^, x'^^ la gid tri nhd nhjit va Idn nhat cua bien thi^t ke cd the la chieu day, chieu cao sdng chinh, sdng phu Khi do, tip hpp gia tri X thda man tat ca dilu kien rang budc gpi la mdt phfldng dn, dd phfldng dn Iam ham Z dat cUc tri la phfldng an toi flu Mi^n tap hdp tdt cd phfldng dn gpi la mien nghiem hay khdng gian bien thiet ke [1,3,5] I.DATVANDE Tdifluhda ket cau Id mdt nhflng bdi todn quan trpng qua trinh thiet ke tau thuy Hien nay, kit cdu than tau chu yiu dfldc tinh chpn theo cac yeu cau cua quy pham ddng tdu hien hanh [2] Thfle tl nhan thay, viec tinh theo Quy pham ddn gian va cdc yeu cau ddi vdi cdc kit cau than tau nghiim ngdt nhflng khdng thl phan anh hit cac dieu kien ndi tau boat ddng, dd tinh theo phfldng phap thfldng phdi chap nhan tdn kem vat lieu va tang trpng Ifldng cua tau vi ban than kit cau chfla d Hien nay, cd rat nhieu phfldng phap dang hdp \y nhat tinh tdi flu ket cau, nhien da so phfldng phap tdiflutren cd sd cd ham m\ic tiiu va ham Chinh vi thl, cdc quy pham tinh ket cau rang budc tfldng minh Ddi vdi bai toan tdi Uu than tdu hi?n diu cho phep va khuyin khich ket cau tau thi vile tim mdt hdm rang bupc ngfldi thilt kl nin tinh chpn lai kich thfldc cac kit cau thdn tau theo cac phfldng phap mdi, tudng minh Id rdt khd khan va khdng kha thi tren cd sd dam bdo dp ben vdi chi phi vat lieu [7] Id it nhat Thiet ke tdiflukit cau khdng chi cho Phddng phap tim kiem trUc ti^p la phep tilt ki^m vat lieu, gid san pham md cdn cho phip nang cao cdc tinh nang hang phdong phap cho thd tat ca cic phdong an dau hai cua tdu, di^ng ban nhfl cai thiln tdc dp nhd vao, td dd phan tich ket cau va tim nghiem toi Uu la phiidng phap khdng can h ^ rang budc gidm bdt trpng Ifldng tau d dang tddng minh, nhdoc diem ciia phddng Bdi todn toi flu ndi chung dflpc phat phap la khdi IdOng tinh toan Idn, thdi gian bieu nhfl sau: Tim tap hpp cac gia tri X=(x ,x tinh toan rft lau [1,3, 5] Ben canh dd, giai thuat x^) de cho hdm sd Z=f(x, x^ xJ dat cflc di truyen 14 mdt phdong phap tinh toi du cung tri (cflc dai hay cflc tieu), ddng thdi thda man khdng can phai cd ham rang bupc tddng minh, cdc dieu ki^n sau: dd bai bao se trinh bay dng dung giai thuat di truyen cho bai toan toi du hod ket cau tau vd thep [4,8] = u«) (1) DOI TtfONG VA PHUONG PHAP NGHIfiN cut; "