ứng dụng lý thuyết tập mờ chẩn đoán trình trạng kỹ thuật hệ thống phanh xe ural 43206

NGHIEN c u u - TRAO DO JCFNG DUNG LY THUYET TAP wia CHAN DOAN "riNH TRANG KY THUAT HE T H N G PHANH XE URAL 43206 DIAGNOSIS, IDENTIFYING BRAKE SYSTEM TECHNICAL STATES OF URAL 43206 VEHICLE BY USING FUZZY LOGIC PGS, TS Nguyen Van Dung, TS Vii Ngoc TuSn Hoc vien Ky thuat Quan sd TOiM TAT echdn doin tinh trgng ky thuit (TTKT) cua cic cum, he thong tren d td cd the sti dung nhilu Bet phUdng phdp khic nhau, vi du nhU: Ly thuylt thdng tin; ly thuyet nhin dgng; ly thuyet tin cdy hoie ly thuyet tap md Ngi dung bii bao, trinh biy viec Ung dung ly thuyet tip md chan doin xic dinh cic hU hdng sU CO cho he thdng phanh xe URAL43206 qud trinh khai thdc Td khoa: Chan dodn ky thuit; Ly thuylt tap md; He thdng phanh ABSTRACT A variety of different methods can be used such as information theory, theory of identity, reliability theory orfuzzy theory to diagnose technical state of vehicle systems or sub-systems Meanwhile, clearly and fully infomation of research subjects need to known This paper presents the method for diagnosis, identifying brake system technical states of URAL-43206 vehicle by using fuzzy logic Keywords: Diagnosis; Fuzzy logic; Brake system ISSN 0866-7056 TAP CHi CO KHi VIET NAM, S6 nam 2016 www.cokhivietnam.vn NGHIEN Cliu-TRAO D | l.DATVANDE Chan doan tinh trang ky thuat cua cac he thong tren to la tac dgng ky thuat vao qua trinh khai thae va sii dung to, nham dam bao cho to boat dpng co tin cay cao, an toan, hieu qua bang each phat hien kip th6i cac hii hong va dU bao tinh trang ky thuat cua xe tiidng lai Tac dong ky thuat cUcfng bile, bao diidng, sifa chifa la he qua theo nhu cau cua chan doan Nhli vay, tac dpng cua chan doan viia mang tinh chu dgng, dd bao vifa mang tinh ngan chan cac hU hong CO the xay ra, nhat la tren cac thi^t bi CO ket cau phcfc tap da dang, nhnng khong thao rdi ma sit dung cac bien phap tham do, dUa vao cac bieu hien dac trifng de xac dinh tmh trang ky thuat cua doi tiipng Chan doan ky thuat co y nghia ldn nhU: (i) Nang cao tin cay cua xe va an toan giao thong nhd phat hien kip thdi va dU doan trUdc dngc cac hit hong co the xay ra; (ii) Nang cao dp ben lau, giam chi phi va phu tiing thay the, giam diidc hao mon cac chi tiet khong phai thao rdi cac tong thanh; (iii) Giam dngc tieu hao nhien heu, dau nhdn phat hien kip thdi de dieu chinh cac bp phan diia ve trang thai lam viec toi Uu; (iv) Giam gid cong lao dpng cho cong tac bao dUdng ky thuat va stfa chiia Khi sii dung cac phddng phap nhU: Ly thuyet thong tin; ly thuyet nhan dang, hoac ly thuyet tin cay, can co thong tin ro rang, day du ve doi tugng nghien cifu Tuy nhien, chan doan ky thuat (CDKT) khong ton tai ngUcfng chinh xac giiia trang thai hong va khong hong, cac dai lUOng mang tinh ngau nhien va khong dinh nghia chinh xac quan he giCfa cac dai lifdng Do do, viec ap dung ly thuyet tap md xac dinh TTKT la hdp ly hdn ca; dac biet, doi vdi cac he thong phiic tap COSdLYTHUYET gia khdch quan cua ngiidi d6i vdi trang t! cua sn vat Xet tap E bat 1^, ca tap c A Ham ^^ co the co c,c gia tri doan ti den Tip A la t^p md (ky hieu la A) va du dinh nghia nhif tap ciia hai v€c td: A=(x, ( x ) ) x e E Vec td X la dinh nghia cua ph£n tif tro tap md A, vec td fi^ la ham lien thugc cua A I tap md difdc phat bieu nhif sau: So thifc c ham//^ (x) ddi vdi moi phan ttf x ^ E difdc i nhu la bac cua y^u to phu thupc cua A 2.2 Ham phu thuoc Cac dac tinh cua ham phu thugc t gora cd: (i) Dp cao cua tap md A cdn gpi la phu thugc cua ham phu thupc va ky hieu n sau: hgt (A) = supfi^ (x); x E E Tap md phai it nhat mgt phan tt co dp cao bang va no di ggi la tap md chinh tac, ngUdc lai gpi la tap i khdng chinh tac; (ii) Mien xac dinh la tap h cac phan td x cua t i p md A co //^ (x) >0; m tin cay la tap hdp cac phan til x cua tap md A /'.W=i- Cac ham phu thupc co the la cac h, vdi cac dang dUdng cong y gan vdi cac h dai so cd ban Tuy vay, cac ham phu thupc di chan doan va dieu khien md thUdng ch la cac ham tuyen tinh (ham T, L, hinh tam g hinh thang ) Trong pham vi nghien cifu, c luat cua ham phu thude dUdc chgn la ham dt hinh thang 2.3 Cac phep tinh logic vdi tap md 2.1 Tap mt* Tap md A dUdc dac tning bdi cac ph^n tii dUa vao d dang mijfc phu thupc ^^ ggi la ham lien thupc va diidc ky hieu nhn la bac phu thupc MiEc phu thupc la gia tri bieu thi sir danh a) Logic rad: Logic md la logic nhieu tri khoang tU den Ddi hoi lo md la phai co quy luat khoang nhd K niem logic md dong nghia vdi khai niem tap i Bi^n logic tap md la cac ham phu thug* ISSN 0866 - 7056 TAP CHi CO KHi VIET NAM, S6 nam 2016 www.cokhivietnam.vn " ^ NGHIEN CLfU - TRAO Dfl Cac phep tinh logic bao gom: tri cua no theo ham phu thuoc tuong dng 2.4 Suy luan md - Phep so sanh: TElp^la tap cua S nohTala n m t r n „ „ S ' r\^ r \ -v Suy luan md sd dung to help cac luat Su ngma la yl nam B neu: u (x)