Tính toán thiết kế gói đỡ thủy lực làm việc theo nguyên lý màng dầu mỏng

TrSn cd sd mO phing Monte-Carlo, siir dgng thujttoin DE Differential Evolution d^ tfnh cdc hf sflf khOng thd" nguyfin, Oi tdi da xdc djnh difgic cdc thdng s6' hlnh hpc tS'i ifu cQa m9t

NGHIDN CL/U-TRfiOodl

TiNH TOAN THIET KE GDI U6 THUY LITC

LAM VIEC THEO NGUYEN LY MANG DAU MONG

IS D6 Q U 6 C Q U A N G , TS N G U Y I N Q U A N THANG

KS CAO V A N M O , K S T A N G BiCH twA

Vlfn Cflng nghj, BJ Cflng tluill|

Bai b^o trinh bay cac ke't qui nghl§n cufu, tinh to^n gCTi 08 thu^ \\le dang 6 chdn sD dyng trong m^y nghign tSng aing suSft 15 T/h - sdn phJm cda Oi tdi cSp nhjl nirtc

"NghiSn cl}u tfnh toan, thiS't Ite'vd cOng ngh$ chfi^t^o gCTi dd thuy l^c chju t i i n$ng Sk

80 ta'n", ma s6'KC.05.18/06-10 TrSn cd sd mO phing Monte-Carlo, siir dgng thujttoin

DE (Differential Evolution) d^ tfnh cdc hf sflf khOng thd" nguyfin, Oi tdi da xdc djnh difgic

cdc thdng s6' hlnh hpc tS'i ifu cQa m9t segment trong gCTi d9 thfiy l^c ddm bdo cOng suS) bdm da~u qua khe la c^c ti^u

Tif khoa: Gol US thuf life, 6 OS mang diu mdng Fluid Think Film Bearing, Kingsbuif

CALCULATE DESIGNING FLUID HLM BEADING

WODK ACCOCDING TO FLUID THIN RLM

THEODY

i

This paper presents the result of researching,

calculating Fluid Thin Film Bearing that is type of thrust

bearing uses for Vertical Roiling Grinding Machine

Based on Monte-Cario simulation, used DE (Differential

Evolution) algorithm in order to calculate some

non-dimensional coefficients to determine opHmal geometric

parameters of segment Into Fluid Thin Film Bearing so

that Fluid goes through slot with minimum pumping

capacity

This result's apiyed for calculating of Fluid Thin Film

Bearing that is type of thrust hearing Is used for Vertical

Rolling Grinding Machine with Capacity at 15 tons/hr

- Product of National Pro|ect "Research ealculeling,

designing i machining process FluU Thin Film Bearing

wm Load at SB tonsT with KC.05.18/0e-10 Code

I Ddt Win i t

G6i (3d thu^ \gc chju tdi n$ng dpe tnjc, d^ phing c6 kfit du hl$n dgi da dupc dua vio Oing dgng tO nhOng nam diu cOa th£ k} XX

G6i thOy luc l^m vi$c theo nguydn ly mang

diu m6ng (Fluid Thin Film Bearings), vdi cM

d$ b6i tran thuy d^ng ho$c thuy tfnh Bty li

dang 6 trUdt ch$n (hudng tnjc) c6 t6c d$ qii^

Idn, hi$u suSt cao, vdi dii cAng suit tmyjii

dOng til 50+9.500 kW vi chiu tii trijng IhSiig

dUng 10 50*1.200 tin

Trong 6 trUcJt chjn d?ng bfti trdn thUyl*,

mling diu b6i Iron glOa hai b i m$t c6 chiiu diy h duoc hlnh th4nh do bdm diu c6 ap suS

cao vi cdc hdc diu (bu6ng t^o ip) giila liai bi m$t Chiiu diy mdng diu h kh6ng d6i ngay

ci khi tic d$ tUdng d6i glOa hai bi mat bS

tran bing khdng Gfii thuj ITnh c6 thi coding hlnh hpc bit k^: phing, trg, trbn, c6n, h * ciu nhung dang cCia mjt ty Iu6n tuang Ongvii dsng cDa m j t tua Ddng diu hudng B bu&S theo b i mSt tua chiy ra phin chu vi ciia ni v4 s§ dupc cip trd Iai buing tao ip B l khe bS

giOa hai mil cDa g«i dd thujr fihh khftng dS*'

I TGpchiKHOAHM , , ,

NGHIDN COfU-TRflOedl

iupng d i u ra kh6i gSi trong m$t dan v| thdi gian ph&i

bing lupng d i u cap v i o g6i

B i i bao d i c i p d i n phuong phip tlnh toin, x i c

djnh c i c thdng s i hlnh hpc t i l Uu cDa mdt segment

trong 6 bdi tran thDy tlnh sao cho cdng suit bOm

dau qua khe l i cue tilu thdng qua vide tlnh toin

cac hd sd khdng thU nguydn, trdn ca sd md phdng

Monte-Carlo v i sQ dgng thu^t toin DE (Differential

Evolution)

II Phuimg phap tinh todn h i sfi khdng thu'

ngiwfin cho gfii dfi" thuy tlnh dang fi irnqt chdn

vdi tf m ito' dpng segment hinh dd qupt

Moi gd'i dd thCiy ttnh d i u iim vide theo nguydn

tac c i p ddng d i u bdi trdn cd i p lidn tgc v i o gida

hai b i mit chuyin ddng tuang ddi Chit lupng lim

vide cDa loai gdi dd nhu v$y phg thudc ehCi yd'u vao

dd tin c$y khi hoat ddng cija h§ thdng c i p d i u bdi

Iron

Khi tiln hinh thilt k l thudng dga v i o ba dai

lupng khdng thU nguyen la a, hd s i t i i trpng, q,

-hd sd IUu lupng va H, - -hd s6 cdng suit d l ehpn Iga

cac kich thudc hlnh hpc hpp ly sao cho cdng suit

d i y d i u qua khe hpp cd g i i trj cgc tilu [1] Gia trj

cDa nhOng dai iupng n i y khdng phg thuoc v i o cac

kich thudc tuydt ddi cCIa gdi ma chl phg thgpc ty le

giOa Chung, chinh x i c han l i ty s i didn tich cOa

budng tao i p vdi t i n g didn tich b l m i t cDa gdi dd

Do viy, vide x i c djnh c i c hd so khdng thU nguydn

cho mdt dang hinh hpe eg t h i cOa g i i dd thDy tTnh

CO y nghTa h i t sUc quan trong

Hd sd t i i trpng cfla gdi dd thuy tTnh a, dupc xac

djnh bing bilu thUc:

W - khS nang chiu tii thgc cOa gSi

^^^ A - di$n tfch hlnh chiSu cda b^ m§t

tga (cm^)

p - i p Igc trong bii6ng diu khi cd khe

h i (kg/cm')

Cdng suit c i n thid't oDa bom d l d i y d i u qua khe hpp trong gdi dd dupc tlnh bang tich giOa i p luc trong buing v i luu lupng qua 6:

« ' - ^

H, = P,.Q = H,.(—)'.- (3a) H,=^

(3)

Trong dd H,la hd sfi cdng suit

Trong c i c t i i iidu [1], [2], [13L [14] d i gidi thieu cdng thUe xic djnh cic hd sfi khdng thU nguydn (a,, q,, H,) cho gfi'i dd trdn bufing trdn trung t i m , gdi dd trdn budng vinh khin, gdi dd chO nhit budng chO nhit, hinh edn, hlnh c i u

Hd sd khdng thU nguyen a,, q,, H, cho gol dd trdn budng trdn trung t i m (hlnh 1) dupc xac dinh theo eic cdng thUc sau [14]:

it)

1

•ft)

Hinh 1: sd dd g6i thuy ITnh co buSng diu

hlnh trdn

m

H$ so khSng thiJ nguyen a,, q,, H, cho g6i dQ co bu6ng dau d^ng vanh kh§n (hlnh 2) dU(?c xac djnh

theo ckc cdng XhOc sau [14]:

i He s6 luu lLf(?ng c£ia goi de thdy tTnh q, dUdc xac

I djnh is^ng bilu thCi'c:

Q - li;u iucfng d&u (cm^/sec)

W - tai trpng tde dyng 16n gfii dd (Itg)

^^' h - c l i i l u day mdng dfiu boi trdn (cm)

m - dO nhdt tuy$t d6i cOa dSu bdi trdn

(kg.sec/cm*)

M

JOf-if) ti.Li

' H I

* • ; • , J ^

Hinh 2: sa dd g6i thuf^ (inh

cd budng diu hlnh vAnh khSn

V^^-i)-^^^4 Ji^)

S«2 + 3nam2013 ^ I^PfiLSJJjgJ: 89

NGHIDN ClJU-TRfiOBdl

H i sd khfing thU nguydn a,, q,, H, cho gfii dd cd

bufing d i u dang hlnh cdn (hlnh 3) dupc xic dmh

theo cic cfing thUc sau [ I ] ;

iTl-(«,/«)•

Hlnh 3: sd d6 gdi thOy tfnh

c6 budng diu hlnh cdn

' 3 l - ( « / « )

1 M0t sd tlnh toin thdy lgc cho ddng diu cd

ip chiy qua khe hgp [4]

PhUPng trinh chuyin dfing v i t i e dfi ddng ch%:

„ = - L ^ ( / - y / ) (4)

2.H dr

Tde dfi dat g i i trj cgc dai khi y = h/2, c6 nglila

l i :

- " " 2 ^ • * • * 4 2 ' 8n dr

Tde dd trung blnh cua ddng chiy ting trong l<he hep:

Hfi sd khdng thU nguydn a,, q,, H, ehe gdi dd

dang hlnh c i u (hlnh 4) dupc x i c djnh theo c i c cdng

thijtc sau [14]:

'' 1

^^^^^^^n

Hinh

c6

4: sd d6 g6i thOy trnh

iuSng diu hlnh ciu

I m ' l k — t — j T — i f

1 C!^, 2o»fl,-oiiB,J

I n't,

*-!'( , _ 1 1

[cos'fl, cos'fl,)

If

"'=7 It

2 I fc' *

3 " " I2n dr

Phin bd i p lUc

dp ^MjlJiq

dr h'.r.dif

(6)

m

hay: dp=^-^.- (8)

h Jtp r

TU (8) ta cd t h i nh§n xdt ring: dpe phiMng hUdng kinh theo chiiu ddng ehiy, i p lgc diu giiiJ

d i n theo h i m logarit

LUU lupng ddng d i u dupe bilu thj dual dsng

Tuy nhidn, trong c i c t i i lifiu tham khio trdn chUa

CO t i i Iidu nio trinh biy ehi tilt co sd tlnh toin cho

segment phing ed hlnh dang khic, mic du loai n i y

rat cd y nghTa thgc tiin ChD y l u eic sfi lifiu dung

cho thiet k l c i c 6 dd thDy tinh dang niy d i u dga

trdn nhDng k i t q g j thi nghifim

Trdn ed sd cie bilu thUc giii tich cd b i n da bilt

va cdng eg tlnh toin mdi cd t h i xiy dgng dupc

phudng phip dD tin ciy xic dinh ba hfi sd khdng

thU nguydn quan trpng cDa gdi dd nhilu segment

dang dd quat khi c i p d i u v i o bufing trung t i m ,

tham ehl c i gdi dd ed hlnh dang phUc tap v i cd i/

nghTa thgc tien hdn

" 12(1

•(5)

(9)

N l u tlnh oho t o i n bfi chu vi ta cd ting liM lupng:

" 6 H

H-)

(10) f

Cdng thUe (10) chl dung khi trdn toin bfi chu«

r„ v i r, l i h i n g sfi

2 Xiy dgng phudng phip tlnh cic h$ so'dio

gdi dd thiy tlnh trudng hdp ting quit

Xic dinh khi ning chiu tii thgc ciia gdi dd Ihiv I *

»« CdNilcUi??!?^ 3«-3n.m20,3

NGHI€NCCfU-TRfiOe6l

TU c i c cdng thUe (1), (2) ta thiy ring, d l xic

dinh dupe c i c hfi sd cDa gdi dd thDy tTnh c i n xic

djnh dupc k h i ning chju t i i v i IUu lupng d i u qua

gdi dd khi gdi l i m vide I n djnh

Bilu dd phin bd i p lgc d i u cd dang nhu hlnh

ve Trong vDng budng d i u i p lUc khdng d i i bing

p,, trong khoing tU r,, dd'n r„ i p luc thay ddi theo quy

lu$t logarit K h i ning chju t i i cDa gd'i trong trudng

hpp chung tlnh theo cdng thUc:

>y = 1^1, +\ P,.dF

fft = FtPr

(11)

B i i i i i i ^iii

i-b

A

Hlnh 5:phinb6ip igc trong gdi dd thiiy tmh

Neu Chia vung ngoii budng tao i p thinh n phan

vd eung nhd thi bleu thUe (11) c6 t h i vilt iai nhu

sau: w^p.jr.t'Zp,/ (12)

Trong dd:

p, - i p Igc d i u trong budng, kg/em'

F,, - didn tfch cDa bufing tao i p , cm'

F„ - phin didn tich ngoii bufing

n - sd phin didn tich ngoii budng dupc chia nhd

f, - difin tfch cDa phin thU i, em'

p, - i p lgc tai trpng t i m cDa phin didn tfch thU i,

kg/em'

p,.(ln(j)-ln(r.,))

s a dgng b i l u thUo (13) ta cd t h i x i c djnh dupe

»ip igc tai mdt dilm b i t wy ngoii budng v i cho phip

tlnh k h i nang chju t i i thgc cDa gdi dfi theo cdng

,,thUc(12)

Ttnh IUu lugng thdng qua gdi dd

Ndu ta ohia toin bfi chu vi thinh k phan, mfii phin ed sfi do gdc 4 t i m l i A^ tuong Ung phin chia

n i y cd b i n kinh bufing l i r„ v i ban kinh ngoii bidn

l i t„,, thi cd t h i tlnh toin bfi iupng d i u qua gdi bang

cich sD dgng cfing thUc (10) dupe vilt dudi dang mdi:

Q h'.p,

Xic djnh cic hi s$ khdng thU nguyin cua gdi thuy tinh

• Hfi sfi chju t i i : bing cich k i t hpp cdng thUc (1)

v i (12), ta cd bilu thUc xic djnh hd so a,:

1

4-^) (15)

Ap lgc d i u ngoii bufing tai dilm bat ky p, xac djnh theo bilu thUe (13)

- Hd sfi IUu lupng: kd't hpp bilu thUe (2) vdi (1) taed:

QA-n

Uf.A„ .Ic' (16)

Thay gia trj Q tU (14) v i o (16) v i giin udc ta dupc bilu thUc tlnh q,;

1

" l 2 a A<p,

(17)

- Hfi so cdng suit: sau khi d i cd hai he so a, va

q, thi H, dupe tlnh theo (3)

Nhu vay, khi bilt dang hlnh hpc cDa budng, dang hlnh hpc cDa bidn vdi dfing d i u chiy ra bidn theo chllu hudng kinh ta cd t h i cai d$t ehUdng trinh tlnh

c i c hd sd vdi dfi ehlnh xic cho phep

Trdn 00 sd cic bilu thUc (15), (17) v i (3), chDng tfii

da tiln hinh lip trinh v i tlnh toin nhim khing djnh sg dDng din cDa cic suy luin toin hpc v i dd tin ciy cDa phuong phip tlnh bang sd D i tiln hinh tfnh toin cho gfii dd dang bidn trdn vdi bufing tao i p tron chfnh tam Kit q u i trung vdi kit q u i tfnh bing giii tich d i dupc cdngb6[1]

SS2 + 3n5m2013 CONG NGHE VltTNf T9PCHKH0ARI m

NGHieNCLfU-TaflOB<3l

jy sd kfch thudc tfii uu dfii vdi gfii dd dang niy l i r„/r„

= 0,55 Cie hfi sd tuong Ung a, = 0,584; q,= 1,501;

H, = 2,57

Hinh 6: sd d6 tinh gdi vdi budng trdn

; 3 S 3 3 I £ s ^

tTnh thudng cd hai dang l i bufing trdn (nDa trdn Wnh 8) v i bufing dfing dang vdi bifin ngoii (nDa diW hlnh 8)

Hlnh 7: dd thi cija hi sd tii Irong va hi sd iuu iugng

khi thay ddi ty sd rjr„

Vdi goi vufing bufing vufing, cd nhilu dang cdng

thUc giii tfch khie nhau nhung khdng cho kit q u i dung

vdi so lieu thue nghifim Theo cich tlnh oDa chDng tfii,

khi tjr sd a/b = 0,5 ta cd a, = 0,5400 dung vdi sd lifiu thuc

nghiem (a, = 0,54) [1]

3 Tlnh cho mdt segment cua gdi dd miy

nghiSn

Do kfch thudc cDa cic mim dd miy nghiin idn

ndn nd thudng dupe c i u tao nhu hlnh 8 Toin bd

b l mat cOa vung tao ming d i u bdi tron dupc chia

thanh tUng minh nhd rdi nhau - segment Mfii mfit

segment dupc c i p d i u dfic l$p v i nhu t h i cd t h i

tlnh toin ridng K h i nang mang t i i , tdng luu lupng,

ting cdng suit d i y d i u cDa toin bd gfii dd bing

tdng k h i ning mang t i i cDa t i t c i c i c segment

Suing tao i p trdn tUng segment cDa gfii dd thDy

Hihh 8: sd dd bd tri cic segment trin gdi dd miy nghOn

Khi tlnh t o i n c i c hfi sfi a,, q, v i H, bing cic cdng thUe (15), (13), (17) v i (3), dilu c i n phii chii >

l i phudng trtnh cDa c i c dudng bidn gidi han cDa segment cQng nhU bufing tao i p phii dupc viil trong hfi toa dfi cd gfic tai d i l m C^ Dfing thdi, xac djnh dung gfic gidi han Phit, Phi2, Phi3 VIdg, vdi segment ed bufing tao i p hlnh trdn khi gdc tfnh loan thay d i i tu 0-180° thi g i i trj cDa r,, se bj gidi han bdi eung A-A1, dudng thing A1-B1 v i cudi ciJng

l i cung B1-B (hlnh 10), trong khi r„ l i khdng d& Trudng hpp cua segment vdi bufing tao ap dong dang vdi bidn ngoii thi r^ cung se thay dll lidn ftic tuang tg nhu bifin ngoii

Trdn ca s6 c i c cdng thilc d i bilt v i nhOng chii y ndu trdn, chung tdi da t i l n hinh l$p trinh d l tlnh cho segment vdi hai loai bufing khic nhau Kit qui tlnh toin cho segment vdi bufing tao i p hlnh tron cbo trdn hlnh 9 G i i trj cgc t i l u dat dupc trong tmdnp hpp n i y trong khoing R„/R^ = 0,58*0^65

Hlnh 10: sd dd tlnh cho budng trdn vi budng ddng dang

4 Bii toin chgn thdng sdhlnh hgc tdi uu cho

gol dd thuy tinh dim bio cdng sugt day diu qua

khelicifctlSu

Xiy dung bii toin

Cdng suit cDa hd thfing c i p d i u cho mdt gfii

dd thDy tTnh bao gdm nhilu thinh phin, trong dd

cd cdng suit d i y d i u qua khe hpp giOa hai m i l

cfi chuyin dfing tuang dfii duac x i c djnh bang tfch

giQa i p Igc trong bging tao i p v i luu lupng d i u

(3a) TU bilu thilc (3a) cho thiy, cfi t h i giim thinh

phin cfing suit n i y bing cich giim g i i trj cDa hd

sfi cdng suit H, Do v i y , trong q u i trinh thilt k l

gfii dd thDy tTnh ngudi ta ludn mong mudn vdi kich

thudc da cho cDa gfii dd (hoic mdt segment) c i n

tlm kich thudc hlnh hpc cDa budng sao cho H, dat

gii trj cgc tilu

TU nhOng vf dg tfnh t o i n d trfin cd t h i rut ra nhin

xet ring: khi hlnh d i n g ngoii cDa gfii hoic mdt

segment l i cfi djnh thi g i i trj cDa c i e hd sd a,, q, v i

H, ch? cdn phg thufie v i o kich thudc hlnh hpc cDa

bufing tao i p Vdi gdi dd cfi budng tao ap trdn thi

a,, q, v i H, chT phg thudc v i o b i n kinh bufing tao i p

Rj, (ham mfit biln) Bing phuong phip sfi, vipc x i c

djnh g i i trj cDa R^ d l H, dat g i i trj cgc tilu l i don

giin nhu trinh biy 6 trin va cac dfi thj nhung vdi bufing tao i p cd bidn phUc tap han, vl dg nhu trong trudng hpp segment cd bufing dfing dang vdi bidn thi khdng ddn giin Vdi trudng hpp cg t h i nhu trdn hlnh 10 thi H, se phg thudc v i o ba bidn ca b i n :

"f=f(';i„r,„.%) (18)

Trong dd:

r,^ - b i n kfnh trong cDa bufing tao i p r„^ - bin kfnh ngoii cDa bufing tao ap

% - hila gfic 6 tim (goc quat) cDa bufing tao ap

Ham f (r,,, r^^, cp^) khd cd t h i bilu diin bing bilu thUc giii tfch tudng minh, bdi de tlnh dupc Hf phii thdng qua rat nhieu cac tinh toin trung gian nhu da trinh bay 6 trdn Tuy nhidn, cd t h i khang dinh ring vdi mdi t i p cac g i i trj cDa (r,^,, r,^^, (pj ta cd t h i x i c djnh dupc mfit g i i trj duy nhit cDa H, Vide x i y dgng him f (r„, r^,,, cp,,) tudng minh cung khfing thgc sg

c i n thid't khi c i c thuit loan tfii Uu mdi cho phdp giii

b i i toan chi can biet gia tri cOa him Trong hd toa dfi vdi goc l i dilm 02 nhu tren hinh 10, bai toin tfii

Uu CO dang:

Tlm tap c i c g i i trj (r^, r„j, ip^) sao cho him:

»,=f(r;„r,,„<l>,)^Min; (19)

Vdi c i c dilu kidn ring budc sau: 0 > r^^ > r

0 < r„j < r„

0 < <Pb < <P, Trong dd: r, - b i n kfnh trong cDa segment

r„ - bin kinh ngoii cOa segment ]„ - nCta gdc d tim cia segment

NhOng dieu kidn rang bufic trfin eh? d i m b i o bufing tao i p khfing vupt ra ngoai gidi han hlnh hpe cho phep

Chgn phUdng phip glil

D l giii b i i toin (19) cd mfit so phudng phip

SS2 + 3nam2013 TopcH KHOAHM

CdNCNCHEVltTNSiir I

NGHIGN CL/U - TRflOi)6l

Phuong phip biln hlnh hojc phuong phip

dung sai mlm [6]

- Thu^t toin Gen (Genetic Algolrithm - GA) [7]

Thu^t toin mfi phing luyfin kim (Simulated

Annealing - SA) [8]

Thuit toin tidn hfia vi phin (Differential

Evolution - DE) [9, 10]

Hai phUOng phip d i u l i cic phuang phip truyin

thfing, vifio xii ly c i c dilu kifin han c h l phUc tap,

kd't q u i phg thufie v i o dilm xuit phit ban d i u , khd

d i m bio cho chung ta nghidm tdi Uu toin cgc Ba

thuat toin sau i i c i c thuit toin thufie ldp c i c thufit

toin dga trdn cd sd md phdng IVIonte-Carlo

Kinh nghifim l|p trinh v i tlnh toin thD nghifim

mdt sd b i i toin phUc tap cDa chung tdi cho thiy,

thuit toin SA v i DE ludn cho k i t q u i hdi tg v i dn

djnh, tifiu chuin dung x i y dgng ddn giin v i ehlnh

xac hon Thdi gian tfnh trdn miy cDa thuit toin

DE ludn la nhd nhat so vdi c i c thuit toin khic khi

giii nhiing b i i toin phUc tap D l giii b i i toan (19),

chung tfii da chon thuat toin DE Gidng nhu thuit

toin GA, DE dga trdn qua trinh tiln hda vdi ba toin

tD cd ban l i dfit bien, iai ghep va Iga ehpn nhung

b i n chit moi toin til iai khac hin vdi thuit toin

GA

Thfing thudng cd t h i dung thuit toin DE khi

bilu thUc sau thfia man:

fmu.- inn

(20)

Co nghTa l i gia trj him cDa moi c i t h i trong

quan t h i g i n nhu bing nhau tCiy thudc v i o g i i trj e

(thudng ehpn e = 10"^)

KSt qui vi thio luin

K i t q u i tlnh c i c tham sd tfii Uu theo cdng suit

d i y d i u cgc tilu cho segment gdi dd thDy tTnh m i y

nghiin dUng vdi hai loai bufing cho 6 bing dudi

day

Cdc tham s5

Bin kinh Irong cia segment (cm) R,

B4nkinhngoSicOasegiiienl|cm)R,

NLla gdc d ISm cHa segment (d^) 9,

Cic t h a n i i t i l Uu

Tf si dijn llch being cao apF/F, vii di^n llch cua segment (%]

H M lii "ong a, H^silUlilliengq,

H$ si cing suit H,

Buingcao

i p t r i n

41,5

66.5

10

21,7

0.507

t,4«3

2,887

Being cao i p i j n g l 3

<ilbltfl 1

4 U

68,5

10

28.5

0.586

1.458

2,569

Cie k i t q u i tlnh dupe trinh b i y fi trdn mdi chili nhUng k i t q u i budc d i u cDa d l t i i v i cung chl gidi han trcng nhiJng tlnh t o i n nghidn cUu trong vung co chuyin dfing tUdng dfii giUa hai b i m$t tnipt Tuy cdn mfit sd y l u tfi chUa t h i tlnh hit trong khi tfnh

t o i n nhung nhdm nghidn cUu cung cd t h i manh dan dua ra mfit v i i nh$n x i t :

- K i t q u i q u i trinh nghidn cDu da d l xuit phUdng phip tlnh g i n dUng dga trfin cd sd vi phin didn tfcli cOa gdi dd, dfi chinh x i c cDa k i t q g i phg thufie vio mUo dfi vi p h i n n i y Dga v i o phudng phip tinh da ndu, b i n g c i c thu^t t o i n tfii Uu mdi cfi t h i xic i(nh nhanh bfi thfing sfi hlnh hpc tfii uu cDa dfii Wijng nghidn cdu

- Vdi phuang p h i p tlnh nhU trfin, dfi chfnh ifflC cDa c i c k i t q u i tfnh so vdi c i c k i t q u i tlnh bing giii tich cung nhu nhOng sfi li$u thgc nghidm da dupc cfing bfi 06 t h i dung dupc trong q u i trinh liip tgc nghidn cUu d dd thDy tTnh

- Vific dCing bufing tao i p dfing dang vdi biin oOa segment khfing chi giim hfi sfi cfing suit dJje 11% so vdi budng trdn m i ofin t i n g k h i ning chju

g TopcH KHOAHM „ ,

NGHIDN ClJU-TRROedl

Xk\ cOa gdi khi ap li^c trong buong tgo ap trong hai

tradng hop 1^ nhu nhau

- Vdi ket qu& d?it du^c se rut ngSn quk trinh thi^c

nghidm vk dgt hi$u quk cao do khdng cSn ch§' tgo

m6 hinh b^ng k[ch thudc thUc

Mat khic, tLT cdc phUdng phdp ttnh cho ckc logi

6 66 thu^ lUc nSu trSn, ta nh$n th&'y vi0c xdc dinh

cac kfch thudc hJnh hpc t6'i uu cho m0t segment cua

goi d8 ch^n thuy ttnh theo phUdng phap khdng thU

nguygn d l 6km bko cdng sud't 6ku qua khe \k cue

tilu CO t h i sCf dgng mOt trong cdc thudt todn t6'i Uu

sau:

- PhUdng phdp biln hlnh ho^c phUdng phdp

dung sai m l m [6]

- Thuat todn Gen (Genetic Algofrithm - GA) [7]

Thudt todn md phdng luydn kim (Simulated

Annealing - SA) [8]

Thuat todn li&i hda vi phdn (Differential Evoiution

-DE)[9,10]

Tren thi/c te tfnh todn, chung tdi da ehpn phUdng

phdp DE Id phUdng phdp ludn cho ket qud hdi tu, I n

djnh, ddn gidn va chfnh xdc

III Ket luin

Vide tfnh todn, thilt k l g i i 6d thDy ii/c (dm viSc

theo nguydn ly mdng d^u mdng (Fluid Thin Film

Bearings) bing phUdng phap tfnh cdc hd sd khdng

thU nguyen, dong thdi sCf dgng thudt todn DE

(Differential Evolution) trdn cd s6 md phdng

Monte-Carlo cho phdp xdc dmh cdc thdng s i hlnh hpc t l i

Uu cho mdt segment cCia g i i thDy iMc sao cho cdng

1 suit bdm d I u qua khe Id cgc tilu Ddy cung Id dilu

I kidn c i n d l vi^c sD dgng g i i dd dgng ndy ddm bdo

I tinh kinh t l

Cdc khdo nghifim khi thgc hien d l tai cho thay:

goi dd thuy lgc dUdc c h l tgo vdi cdc thdng s i hinh

I hpc dUdc tfnh toan theo phUdng phdp dd ndu lam

I viec I n djnh, cac thdng so Idm vide do dgc dUdc khi

I khdo nghidm hoan todn phD hdp vdi tfnh todn NhU

vdy c6 t h i k i t lu$n rdng: phUdng phdp tfnh todn ndu trdn cd cd sd khoa hpc, cd dD d | tin cdy khi Ung dgng vdo thgc t l , d$t cd sd cho vi^c lam chD thilt

k l , c h l tgo g i i thOy tTnh trong nUdc •

Tai li$u tham khao

1 rappM Piinnejia: "flpoeKTHpOBaHMe rtiflpocTaTMHecKMX riofliuMnHMKOB" MAUJMHOCTPOEHME

- MocKBa, 1967

2 CA HEPHABCKMM: "nOflUJMnHHKM CKOJl'b>KEHMfl" MAUJHH0CTPOMTE/l"bHAJ1 JIHTEPATVPA - MocKsa, 1963

3 Nguyen HOu Chf: "Ccf hQC ch^t I6ng Cfng dyng - TSp 1;

PhSn dai CUdng" Nxb Dai hgc vS Trung hpc chuySn nghigp -HdNOi, 1972

4 Nguy§n Phi/dc Hoing: 'Thily Ijc vS m i y thuy lyc - T§p 1; ThOy iMc dgi ci/dng" Nxb Dgi hi?c vii Trung hgc chuydn nghidp - H i N6i, 1970

5 W.B Rowe, J.P O'Donoghue: "Design Procedures for Hydrostatic Beartngs"

6 M Davis Himelblau: "Aplication Nonliear Programming" - Mir, 1975

7 Zbigniew Michalewicz: "Genetic Algorithms + Data Structures = Evolution Programs" Springer - Verlag, 1994

8.S.Kirltpatrick,C.D.Gelatt,Jr.M.P.Vecchi:''Optimization

by Simulated Annealing Volum220'' SCIENCE, 1983

9 Rainer Storn, Kenneth Price: "Differential Evolution

-A Simple and effective scheme for global optimization over continue spaces", 3-1995

10 Kenneth Price, Rainer Storn, Jouni Lampinen:

"Differiential Evolution - A Practical Approach to Global Optimization" Spnnger, 2005

11 Kingsbury, Inc - 2003: "Equalizing Thrust Bearings

- Comprehensive Design Guide 2003" Jk\ li$u Internet

12 FLENDER - 2006: "Bevel Planetary Gear Units for Vertical Mill Drives" T i i ligu ndi b$

13 R Gohar H.Rahnejat: "Fundamentals of Tribbology"

Imperial College Press, 2008

14.BorflaHOB.O.M:"PacHeTOnopCKOjn>)KeHMJi".TEXMKA KMEB, 1966,

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