Trial of Registration Seminar PPT

7/25/2019 Trial of Registration Seminar PPT

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EFFECT OF SURFACE TEXTURES ON PARALLEL

SLIDING SURFACES

Presented by

Syed Ismail

Department o !e"#ani"al En$ineerin$

Indian Instit%te o Te"#nolo$y ara$p%r

Pro !i#ir Saran$i

Under t#e $%idan"e o


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O'ER'IE( OF PRESENTATION

2

INTRODUCTION

STATE OF T)E ART

O*+ECTI'ES

T)EOR,

!ES) CON'ERGENCE AND 'ALIDATION OF NU!ERICAL SOLUTION

EFFECT OF S-UARE.S)APED TEXTURE INCLUDING FLUID INERTIA

EFFECT OF !ULTI.TEXTURES ON PARALLEL SLIDING SURFACES

CONCLUSION

FUTURE PLAN OF T)E (OR&

REFERENCES

CO!PARISON OF T)E DIFFERENT.S)APES OF TEXTURES


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(#at is meant by !i"ro.Te/t%re0

Deterministi" mi"ro te/t%res are t#e s%ra"e eat%res t#at #a1e spe"ii"

pattern in terms o s#ape2 si3e2 orientation and distrib%tion4

(#at is t#e importan"e o !i"ro.Te/t%re0

Dierent appli"ations o !i"ro.Te/t%re0

Cylinder liner #onin$ to pre1ent sei3ers2 s%ra"es o modern ma$neti"

stora$e de1i"es2 !E!S5!i"ro.Ele"tro.!e"#ani"al Systems6 de1i"es2

!e"#ani"al seals

Dierent met#ods to impro1e Tribolo$i"al perorman"e "#ara"teristi"s

L%bri"ant density "#an$e2 a"e 7a1iness2 radial taper2 #ydro.

pads2 lobes and s%ra"e ro%$#ness

To impro1e t#e Tribolo$i"al perorman"e "#ara"teristi"s4

INTRODUCTION

3


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INTRODUCTION

Ne$ati1e Asperities

Rapid "#an$e in t#e "ross.se"tion2 Synt#eti" Oil2 S%per.laminar

5T%rb%lent6 lo74

Positi1e Asperities

Importan"e o l%id inertia ee"t0

Dierent types o s%ra"e te/t%res0

4


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STATE OF T)E

ART

)amilton et4al 589:;6 Ee"t o s%ra"e irre$%larities on a"e seals

, &li$erman and I Etsion 5


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STATE OF T)E

ART

6

I Etsion et al42 56 E/perimentally in1esti$ate t#e ee"t o partial

te/t%red s%ra"e o1er %n.te/t%red s%ra"e oparallel t#r%st bearin$

)ai7% ,% et al42 5


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STATE OF T)E

ART

7

S C%pillard et al42 5


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O*+ECTI'ES

8

Ee"t o dierent s#apes2 si3e and orientation o positi1e and ne$ati1e

te/t%res 7#i"# "an 1ary t#e perorman"e "#ara"teristi"s o slidin$ "onta"ts4

S@%areRe"tan$%lar Cir"%lar )e/a$onal

Trian$%lar EllipsoidalDome


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O*+ECTI'ES

Ee"t o l%id inertia on te/t%red slidin$ "onta"ts by t7o met#ods

84 Pert%rbation met#od


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T)EOR,T)EOR, OF SURFACE TEXTURE

10


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T#e non.dimensional @%antities are

abo1e t#eprotr%sion

else7#ere

gC hh

C

=

T#e ilm t#i"Bness bet7een t#e parallel s%ra"es or t#e positi1e

te/t%res is

2h

hC

= gg

hh

C=

abo1et#eRe"ess

else7#ere

gC hh

C

+=

T#e ilm t#i"Bness bet7een t#e parallel s%ra"es or t#e ne$ati1ete/t%res is

T)EOR,

11


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T)EOR,

8 abo1e t#e Re"ess

8 else7#ere

gh

h

+=

8 abo1e t#e protr%sion

8 else7#ere

ghh

=

In Non.dimensional orm

12


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T)EOR,

!odiied Na1ier.StoBes e@%ation in"l%din$ t#e l%id inertia ee"t is

u u u u p uu v w

t x y z x y y

+ + + = +

=

p

y

=

w w w w p wu v w

t x y z z y y

+ + + = +

and t#e Contin%ity e@%ation is

( ) ( ) ( )=

u v w

t x y z

+ + + =

T)EOR, OF FLUID INERTIA EFFECT

13


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T#e Non.dimensional @%antities %sed to Non.dimensionali3e t#e Na1ier.

stoBes e@%ation are

T#e non.dimensional orm o t#e steady.state Na1ier.StoBes e@%ation

in"l%din$ t#e l%id inertia ee"t is< =4H=8

=4H 84??9 84?9= 84??9

=4; ?48H?> ?4>H9? ?48>:

=49 8?4=8

=4H 84?9?< 84?9H 84?;H

=4; ?4; ?4= ?48H8

=49 8?4=;>? 8?48>? 8:499

Re LD ( 5Present6 ( 5&aBoty6 ( 5C#en6

=4H: 8

=4< =4H8>? =4H=H: =4H=H8

=4H 84;8H< 84;==9 84?9=

=4; ?4


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25


T#e n%meri"al analysis 7as perormed to determine t#e ee"t o 1ario%s

non.dimensional parameters liBe aspe"t ratio2 te/t%re #ei$#t ratio and

Reynolds n%mber4 T#e limits o t#ese parameters are

Aspe"t ratio 5 6 =48 =49A A

Te/t%re #ei$#t ratio5 6$ =48 =4:$

= Re 84> Red%"ed Reynolds n%mber 5 6Re


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=48 =4< =4F =4> =4H =4:=

=4H

8

84H

=4H =4:=

=4=H

=48

=48H

=4 =4H =4: =4? =4; =49=

=4=H

=48

=48H

=4 =4H =4: =4? =4; =49=

=

:=

;=

8==

8=

8:=

Fri"tionparameter

Aspe"t ratio



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29

CO!PARISON OF DIFFERENT.S)APES OF TEXTURES (IT) FLUID INERTIA

Sl4 No Unit Cell Des"ription !a/im%m Aspe"t ratio

8 S@%are =49

< Cir"%lar =4?;

)e/a$onal =4:H

> Dome =4?;

H Ellipsoidal =4;

: Trian$%lar =4

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