Các phương pháp tối ưu hóa các kết cấu cần trục tháp

N G H I E N CUfU - TRAO D O I •ftS" CAC PHU-QNG PHAP T | WU HOA CAC KET CAU CAN TRUC THAP METHODS OF TOWER CRANE CONSTRUCTION OPTIMIZATION TS Nguyen Danh Sffn Tnicmg Dai hoc Cong nghiep TP H6 Chi Minh TOM TAT Bdi bdo dtia cdc phuong phdp toi tm hoa ctic kit cdu cdn true thdp si> dung khdi luyng lain hdm muc lieu Bdi bdo cSng dua su-OTdung lap trinh dpng luc hoc giai bdi todn tdi uu di gidm ddng ki khdi luang tinh todn Tir khoa; Cdn true thdp, toi iru hoa The paper brings out methods of tower crane constructions optimization, using craneweighl being purpose Junction The paper also bring forward of dynamical programming in resolving optimization problem for reducing calculating quantity Keywords: Tower crane, optimization D ^ T VAN DE GIAI QUYET VAN DE Sir tang khoi lugng san xuat cac c k true va cong suat ciia chung dat bai toan t6i uu hoa cac thong so cua chiing Mot s6 nha chuyen mon da nhan djnh rang, xac dinh cac trj so toi uu ciia cac thong so can true thi chuin chung hon ca la cue tieu cua tong cae gia quy doi cho che tao va khai thac cin true tinh cho mot tan hang hoa duge van chuygn bing can true mgt nam Do lugng cac thong sa DS giai bai toan don gian hon, co the tach nhung bai toan rieng biSt, chjng han nhu t6i uu hoa kSt cju thep, toi uu' hoa cac co ciu v.v Trong bai bao nay, xem xet cac phuong phap t6i uu hoa cac kSt ciu ciia cin true thap, sii dung khoi luong lam ham muc tieu (ehi tieu chit lugng) Truong hgp ham muc tieu la gia thi bai toan duac giai mot each tuong to la Ion, cung nhu c6 nhOng han ehi va cac diiu kien phy nen bai toan toi uu hoan canh la rat phuc tap Khi thiit k i cin true thi mot s6 thong s6 dugc coi la cho truoc Do la cac kieh thuoc hinh 1,0,., chiiu cao nang, tim vol va cac thong s6 tai trgng Cac thong so cin true khong nim s6 TAP CHi CO KHi V I £ T NAM, S6 nam 20 i www.cokhivietnam.vn NGHIEN CUfU-TRAO D | cac thong so cho truoc nhu cac kich thuoc hinh hgc ciia tiet dien c3n va thap la cac thong so thay m=pY^Ff doi thi nguoi ta lua chpn qua trinh thiet ke Bai toan thiet ke toi im la chgn cac gia tri ciia Trong do: p - ty trgng eiia vat lieu, F^, 1^ cac thong so thay doi, tai chi tieu chat lugng CO gia tri toi mi Trong phucmg phap toi uu hoa - tuang ling la dien tich tiet dien ngang va chieu dugc trinh bay tilp theo a day, thi nguoi ta liy dai cua phan tii thu t lien kit cac cum i va j tong cac khoi lugng cac phan tii ciia he lam ham Doi vai cac mit luai thi F_ la dien muc tieu m De tien mo ta ta sii dung cac ky hieu tich quy dan dugc tinh cac chinh cung nhu vec ta cac giang Gia thiet la ki6u tilt dien cua Gia sic: x = {x^,x2 ,x^Y - la cot- vec tamoi phan tii he la cho truac Cac dien tich ciia cac thong so cho truac F^ va cac mo men quan tinh j^ cua tiet dien doi Cbay = {y^,y2, ,y„Y- la cot- vec ta voi phan hi thii t xac dinh P^, bai cac thong s6 bien doi ciia cac thong so thay doi Ham muc tieu dugc bieu thj bai quan he: y, = lywyii'••••>yp }' ^O' ^^^ "^^i phan tii c6 the m = m(x,y) (1) viet dugc cac dieu kien giai ban: Khi do, cac thong so can thoa man dieu