Sự biến dạng của gối đỡ dạng bạc lót dưới tác dụng của áp suất trong màng dầu bôi trơn

Cong tnnh Khoa hpc

SU BlfiN DANG CUA G6 I DOf DANG BAC LOT DU^Ol TAC DUNG

CUA AP SUAT TRON G MANG DAU BOI TRON

NGUYEN THIET L^ P

Khoa Cakhi

Trir&ng Dgi hgc Giao thong Van tai

Tdm tat: Bdi bdo trinh bdy su bien dgng cua gdi dd dgng bgc Idt dirdi tdc dung cua dp

sudl Irong mdng ddu bdi tran. Ap sudt trong mdng ddu dugc xdc dinh thong qua viec gidi gdn

dung phuang trinh Reynolds bdng phuang phdp Newion - Gaphson vd phucmg phdp Igp Gauss

- Seildel. Bien dgng cua bgc lot vd gdi da dugc xdc dinh bdng cdch dua dp sudl mdng ddu vdo

mo hinh Abaqus.

Summary: The paper presents the deformation of the shells and the housing of journal

bearings under the pressure in the oil film for lubrication The pressure in the oil film is

defined by par resolution of the Reynolds equation with the Newion - Gaphson method and the

roop of Gauss - Seildel method. The deformation of the pads and the housing are calculated by

transfering the oil film pressure into the model of Abaqus.

I. DAT VAN DE

Su bien dang cua cac gdi dd se dnh hudng di n kha nang lam vi6c, kha nang bdi tiem ciing

nhu tudi thg cua gdi. Trudc ddy, khi nghien ciiu cac gdi dd dang bgc tren ddng ca ddt tiong (c6

khu^oi, cd bi6n, chdt pit tdng), ngudi ta thudng coi gdi dd khdng bi biin dgng. Trong hai thap ky

gdn ddy, da cd nhiing nghien ciiu v l su bii n dgng ciia gdi dd tiong qua tiinh lam vi$c. Nhiing

nghien ciiu nay coi su bien dang va su trugt sinh ra do mdt luc tap tnmg quay vdng dgt vao gdi

dd [1] - [3]. Thuc te, tai tigng tii cd true tac dung len be mat gdi dd dugc phdn bd trong mang

dau bdi tion. Cac nghien ciiu v l bdi Iron thuy dgng da chi ra rang, ap suat trong mang ddu boi

tion cac cd true, cd bien dugc phdn bd dang parabol theo chieu rgng ciia gdi dd va khdng doi

xiing theo chu vi cua gdi [4] - [8]. Gia tii cda dp sudt phdn bd nay phu thudc nhilu yl u Id khac

nhau: thdng sd ki t cdu, nhiSt do, tai tigng lac dung 16n gdi dd va su khdng lien tuc ciia mang

dau,... Dudi tac dung ciia ap sudt trong mang dau, gdi dd bi bii n dgng khdng di u theo chilu

rdng va 18ch khdi phuan g ciia lire mdt khoang nhdt dinh. Trong mgt nghien ciiu gdn day, de

ddnh gia do mdn cua gdi dd cd bdi tion thuy ddng, Dutfoy L. va Ligier J.-L. [9] da md phdng su

bi8n dgng gay ra do ap suat mang ddu, nhung chi danh gia tgi mgt vi in cda luc tac dimg vao c6

bien (phia than thanh truyln).

Nghien ciiu nay se kit hgp giua viec tinh toan ap sudt mang ddu tien c o sd phuang tiinh

Reynolds va viec tinh toan bien dgng cua gdi dd bdng phuang phdp phan tii hiiu han (FEM).

Qua dd cd the xac dinh chinh xdc viing bien dang cung nhu danh gia miic do bien dgng ciia gdi

dd vdi ch i do bdi Iron thuy dgng.

128 Tap chi KHOA HQC GIAO THONG VAN TAI S6 dac biet - 11/2015