Giải pháp số khảo sát biểu đồ áp suất ổ thuỷ động

NGHIEN cflu - TRAO D I CIAI PHAP SO KHAO SAT BIEU t>6 AP SUAT THUY PQNC Digital solution for studying on hydraulic pressure of journal bearing Trfn Van Thilc, PGS.TS Pham V i n Hiing Bo mon Mdy & Ma sdt hoc, Vi|n Co khi, Tru6ng D^i hoc Bach khoa H i Nfii TOM TAT Hien nay, bdi trdn thiiy dgng dUdc sd diing khd bien cdc thiet bi mdy mdc Cdc titHy dgng thudng dung cdc kit cdu cd tdc quay vd tdi ldn Vtec khdo sdt dp sudt thdy dgngtai vung chiu tdi trgng cita bdi trdn Udt cdy nghia quan trgng viic xdc dinh khd ndng tdi cita o, tddo, CO the dUa cdc cdi tiin kit cdu hdp ly cho khd ndng tdt cao hdn Thiet bi dp sudt thiiy ddng truyht thong chu yeu sd dting cdc ddu cd cd nhieu hqn chi vi tdn sd ldy mdu, sai so tri ldn ddn den ddp itni chdm hoac dung cdc ong bo tri xung quanh chu vi Trong bdi bdo ndy tdc gid dd dUa gidi phdp tip sudt thuy ddng sddiing ddu so Thiet bi khdo sdt dp sudt thity ddngsd diing ddu sd cho phip liin tttc dp sudt ddu trin chu vi vd ddu dUdc kit not mdy tinh Tin hiiu dp sudt trin o thuy ddngqm ddu dugc chuyen doi thdnh tin hiiu sdvd mgt phdn mem mdy vi tinh cd nhiim vti xdy dting thiap sudt thuy dgng trin chuvi Gidi phdp so cho phep khdo sdt biin dp sudt thuy dgng chinh xdc, tilt cdy vd hiiu qud rdt phu hdp vdl cdc phong thi nghiim chuyin ngdnh bdi trdn ABSTRACT Now aday, hydraulic bearing lubrication is commonly used in many industrial equipments Tk hydraulic bearing is often used in high speed and heavy load mechanisms Studying on hydraulicpressuri at loading area of wet lubrication bearing play an important role tn determining the load capacity l^ the bearing and then propose structural Improvements for higher load capacity Conventional hydradt pressure measuring equipments mainly use mechanical gauges which have limitations in samplinS frequency, errors due to slow response or sampling tubes arranged around the brush of the bearing In M paper propose a solution for measuring hydraulic pressure of journal bearing using only one digital sensot This measuring equipment continuously rotates around the brush of bearing and measring result is setil to computer Pressure signals are proceed by a computer software then plot hydraulic pressure profile ofiti bearing The digital solution allows to study profile of hydraulic pressure accurately, reliablely, and effecHdj It is absolutely appropriate with lubrication laboratories in Vietnam TAP CHI C O KHl VlfiT NAM • So (Thang nam 7(117^ NGHIEN ClJfU - TRAO D(!)l GI6I THifiU Vat lilu Idm bac bang ddng ed cap ehinh xac Id 8: [P] = 1,5 MPa Rz = \xm, O thuy ddng vdi nhilu flu diem: kit cau H | sd truyin nhiet cfla vat lieu d gpn nhe, re, yeu eau bao tri it, tudi thp kep ddi va hieu qua bdi trOn tdt n i n nd dflpc sfl dpng khdng khi: a =1,97 — rdng rdi cho nhilu flng dung khdc cua chl tao mdy co Mat khac, mdng dau eung tao Dflng dau bdi tron kha ndng hdp thu sdc va cho phip giam chan vd dupe coi nhfl mdt thdng sd thilt k l de kiem sodt - Ddu cdng nghi|p cd dd nhdt dpng Iflc hpc rung ddng Trong thflc tien h i | n nay, dd xuat h i | n H = 0,015Pas nhilu loai vdt lieu mdi cd tinh chdng mdi mdn - Khdi lupng rilng vd ma sat rat cao, ddng thdi vdt lieu bdi tron tdng p = 0,880kg/dm^ hop cd kha nang bdi trdn cao nin da xuat hien cde phfldng phdp thiet k l cdng n g h | ddm bdo tudi Kit cau d vd so dd tinh tren hinh Ivd hinh 2: thp va dp tin edy eua cac cum mdy va ehi tilt mdy trln CO sd ddm bdo mang ddu bdi trOn fldt d Viet Nam, vile eung cap day dfl cdc thdng tin phuc vu eho tinh todn thiet ke d dd thuy dpng Id rat han chl Cdc thiet bi hien ed chu ylu sfl dung cae dau CO vdi ddp flng eham cd nhilu sai sd hiin tflpng tre dp cua chat Idng hay sai sd cua cdc bd truyin CO Hon nfla, sfl dung cac dau CO gay khd khan tfl dpng hda thilt bi Vdi ylu eau eua vile hien dai hda thiet bi, ndng cao tan sd lay mau va dam bao qud trinh la liln tuc tren ehu vi d thuy ddng tde gid dd Ifla chpn dau Hinh 1: Kit cau d dd boi trOn thuy ddng sd cho ddp flng nhanh, tan sd lay mau ldn vd dp chinh xdc cao Ddng thdi, tac gid eung viet phan mem mdy tinh d l thu thdp xfl ly kit qud do, tfl ddng dilu khiln qud trinh vd ve bieu dd dp i suat P H A N Tf C H T H I E T KE H £ THONG 2.1 Kit clu CO ! I I I D l ddm bdo qud trinh Idm viec binh thfldng cfla d va lay dflpc sd lieu chinh xde thi cum ehi tilt quan trpng nhat eua kit eau ca Id cum dd bdi tron thiiy dpng tdi trpng tinh vdi cdc thdng sd lam viec nhfl sau: Hinh 2: So tinh toan cua d ; Tdi trpng tinh ddt vdo F =500 N, ' Tdc dp quay cfla true 1350 vdng/phut, T ^ t = 28"C i Vdt li|u lam true bang thip 45 tdi vdi cap chinh xac la 8: Rz = pm Vdi cdc dilu kiln dau vdo nhfl trln can xde dinh cdc thdng sd hinh hpc va kha nang tdi euad [4]: TAP CHf CO KHf VlfiT NAM • S6 (Thdng nam 2012) NGHIEN cflu - TRAO 0(51 Liiu lltong dpc troc c h o n ti so: Q= Q L.C.V= 0,314.36.10' 0,03.10' 5,2 = 1,76.10'(m'/s) \ ^ U b = 36mm, d = m m 2!l.NJt Kiem tra lai dp suat cho ph^p P,b bd 36.28 Trong d6: v = 0.579.UPa < IPn) - l,4.Wi>