13_v5_gpsfordesigner_ws_13_030402

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WS13-1

WORKSHOP 13

BICYCLE FENDERSURFACE MESHING

CAT509, Workshop 13, March 2002



WS13-2CAT509, Workshop 13, March 2002




WORKSHOP 13 – BICYCLE FENDER

Material: Bright Green Plastic

Modulus of elasticity = 31.9e4 psi

Poisson Ratio = .38ensity = .!43 l"#in3

esign re$uire%ents:

&hic'ness( t = !.!) inch

*ind +oad( , = - psi

Problem Desr!"#!o$ Assume you are speeding don a s!eep hi"" a! 30

mph# This causes a ind "oad o$ 5 psi on !he $ender# %e!ermine !he ma&imum s!ress and de$"ec!ions#

- psi



WS13-'CAT509, Workshop 13, March 2002

S%&&es#e' E(er!se S#e"s

1# S!ar! !he Ad(anced Meshing Too"s ork)ench *s!a!ic ana"ysis+#

2# Speci$y g"o)a" sur$ace meshing parame!ers#3# Add sur$ace cons!rain!s#

'# mpose sur$ace nodes#

5# Mesh !he par!#

# Check mesh .ua"i!y and repair#

/# S!ar! !he enera!i(e S!ruc!ura" Ana"ysis ork)ench#

# di! sur$ace !hickness#

9# App"y a c"amp res!rain!#

10# App"y a pressure $orce#

11# Compu!e a""#

12# Check g"o)a" precision *anima!e de$orma!ion and $ind e&!remas+#

13# e$ine mesh and re-compu!e#

1'# 4isua"ie $ina" resu"!s#

15# Sa(e !he ana"ysis documen!#

WORKSHOP 13 – BICYCLE FENDER




S#e" 1) S#*r# #+e A',*$e' Mes+!$& -ools .or/be$+

S#e"s0

1) 6pen !he e&is!ing

s13$ender#CAT7ar!

$rom !he !raining

direc!ory#

App"y p"as!ic ma!eria"

proper!ies !o !he $ender

par! as re.uired#

) S!ar! a S!a!ic

Ana"ysis i!h !he

Ad(anced meshing!oo"s ork)ench# The

ma!eria" proper!y does

no! sho up in !he 8M

!ree un!i" you "aunch

!he 7S ork)ench#

Sa(e your ana"ysis#

2

1



WS13-CAT509, Workshop 13, March 2002

S#e" ) S"e!2 &lob*l s%r2*e mes+ "*r*me#ers

S#e"s0

1) Se"ec! !he Sur$ace

Mesher icon#

) Se"ec! !he par!#

3) Speci$y !he mesh

sie as shon, i!h

e"emen! shape se! !o

$ron!a" .uadrang"e

me!hod, se"ec! 6#

6!her mesh me!hods

are a(ai"a)"e a$!er !his

ini!ia" shape using !he

re-mesh a domain icon#

2

1

3

ree edges are displayed ,ith a green color.

/nspecified edges are displayed ,ith a ,hite color.

Gaps ,ould "e displayed ,ith a pin' color.


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S#e" 3) A'' s%r2*e o$s#r*!$#s

2

1

Add cons!rain!s#

S#e"s0

1) Se"ec! !he

Add:emo(e

Cons!rain!s icon#

) Se"ec! !he $our hi!e

unspeci$ied edges, !hey

shou"d !urn ye""o# This

;cons!rains< !he edges,meaning !he $ini!e

e"emen! edges i"" a"ign

a"ong !his cons!rained

edge#

Se"ec!ing i! again i""

remo(e !he cons!rain!#


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S#e" 4) Im"ose s%r2*e $o'es

1

mpose node

dis!ri)u!ions around !hemoun!ing ho"es#

S#e"s0

1) Se"ec! !he mposed

=odes icon#

) Se"ec! a"" !he ho"e

$ree edges *one a! a

!ime+ and impose 5nodes on each > circ"e#

?ou can speci$y node

dis!ri)u!ions on

cons!rained or $ree

edges#

2


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S#e" 5) Mes+ #+e "*r#

1

S#e"s0

1) Se"ec! !he Mesh The

7ar! icon# The mesh is

genera!ed immedia!e"y#

) =o!ice !he

modi$ica!ion Too"s

!oo")ar is no a(ai"a)"e

and !he .ua"i!y

(isua"ia!ion mode is

au!oma!ica""y made

curren!#

2



S#e" 6) C+e/ mes+ 7%*l!# *$' re"*!r

1

Check !he .ua"i!y o$ !he

$ini!e e"emen!s )ysearching $or a"" !he

ors! e"emen!s#

S#e"s0

1) Se"ec! !he @ua"i!y

Ana"ysis icon#

) Se"ec! !he Wors!

e"emen!s )roser#3) 8or !his mode",

searching $or !he 10

ors! e"emen!s shou"d

$ind !hem a""# Cyc"e

!hrough !he !op 10 )y

se"ec!ing Au!o8ocus on

e"emen! and =e&!#

2

3



S#e" 6) C+e/ mes+ 7%*l!# *$' re"*!r

1

8i& !he ors! e"emen!s

using node dis!ri)u!ion#

S#e"s0

1) Se"ec! !he mposed

=odes icon#

) Se"ec! !he )oundary

edges as shon*separa!e"y+, key in 0#2

inch, se"ec! 6#

The "e$! side "ooks

good, more ork is

need on !he righ! side#

2



S#e" 6) C+e/ mes+ 7%*l!# *$' re"*!r

1

se ano!her !oo" $or

$i&ing $ini!e e"emen!s#

e-Mesh a %omain

S#e"s0

1) Se"ec! !he e-Mesh

a %omain icon#

) Se"ec! !he %omain

as shon, change !he

mesh me!hod !o 8ron!

!rias, se"ec! 6#

%o !he same $or !he

opposi!e side#

3) =o!ice !he Mesh

me!hods !ha! are

a(ai"a)"e !o you here#

3

2



S#e" 6) C+e/ mes+ 7%*l!# *$' re"*!r

Ano!her !oo" $or $i&ing

)ad $ini!e e"emen!s#

Manua""y di! mesh

S#e"s0

1) Se"ec! !he di! Mesh

icon, !urn o$$ a"" !heop!ions#

) Bo"d !he cursor on

!he node un!i" !he

sym)o" changes as

shon and drag don

s"o"y un!i" !he e"emen!

!urns green#

3) igh! c"icking one"emen! edges )rings

up !his con!e&!ua"

menu# ?ou rea""y do no!

need !he con!e&!ua"

menu hen you see

!he condense or inser!

sym)o", us! "e$! c"ick#

3

Before

0fter

2

1


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S#e" 6) C+e/ mes+ 7%*l!# *$' re"*!r

Manua""y di! mesh

*con!#+#S#e"s0

1) di! a"" e"emen!s un!i"

you ha(e a"" green#

) se !he "emen!

.ua"i!y )roser !o $ocus

in on o!hers#

Before

0fter

2

1tep 2ne

tep &,o



S#e" 8) S#*r# #+e GSA .or/be$+

Sa(e your ana"ysis $irs!#

S#e"s0

1) Daunch !he

enera!i(e S!ruc!ura"

Ana"ysis ork)ench#

1



S#e" 9) E'!# s%r2*e #+!/$ess

S#e"s0

1) Se! up a"" your

e&!erna" s!orage names

and "oca!ions as usua"#

) di! !he sur$ace

!hickness *0#0in+ )y

dou)"e c"icking Ma!eria"

7roper!y2%#1 in !he

$ea!ures !ree, se"ec!

6#

1

2


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S#e" :) A""l * l*m" res#r*!$#

S#e"s0

1) App"y a c"amp

res!rain! !o a"" !he

moun!ing ho"es#

1



S#e" 1;) A""l * "ress%re 2ore

Assume !he pressureis $rom !he inside ou!#

S#e"s0

1) Se"ec! !he 7ressure

icon and !he ou!side

$ace as shon, key in

-5psi#

1



S#e" 11) Com"%#e *ll

1

Sa(e $irs!#

S#e"s0

1) Compu!e A""#



Check De2orm*#!o$<

and g"o)a" precision#

S#e"s0

1) Crea!e a de$ormedimage and anima!e !o

(eri$y your par!

de$"ec!s as e&pec!ed#

) Check "o)a"

precision#

ecommend 20E or

"ess#

S#e" 1) C+e/ &lob*l "re!s!o$

1a

1)

2a

2)




S#e" 1) C+e/ &lob*l "re!s!o$

1

8ind !he g"o)a"

e"emen! i!h !he

highes! es!ima!ed

error#

S#e"s0

1) se !he Search

mage &!rema icon#

=o!eF "oca" precision

and !he adap!i(i!y )o&

are no! a(ai"a)"e $or

sur$ace 8M#




S#e" 13) Re2!$e mes+ *$' re=om"%#e

3

e$ine !he g"o)a"

sur$ace mesh#

S#e"s0

1) Daunch !he

Ad(anced Meshing

Too"s ork)ench#

) %ou)"e c"ick Smar!

sur$ace Mesh#1 in !he$ea!ures !ree, !hen

se"ec! ?es#

3) Se"ec! !he "o)a"

Meshing 7roper!ies

icon, edi! as shon#

1

2





WS13-2'CAT509, Workshop 13, March 2002

S#e" 14) >!s%*l!?e 2!$*l res%l#s

Sa(e $irs!#S#e"s

1) Compu!e A""#

) 8ind !he s!ima!ed

"o)a" error again#

ood, )e"o 20E#

1

2




S#e" 14) >!s%*l!?e 2!$*l res%l#s

8ind !he ma&imum

de$"ec!ion#

S#e"s

1) Se"ec! !he

disp"acemen! icon#

1

S 14 >! l! 2! l l




S#e" 14) >!s%*l!?e 2!$*l res%l#s

1

8ind !he ma&imum

4on Mises S!ress#

S#e"s

1) Se"ec! !he 4on

Mises icon#

S# 14 >! l! 2! l l#



WS13-2/CAT509, Workshop 13, March 2002

S#e" 14) >!s%*l!?e 2!$*l res%l#s

Co$l%s!o$s This $ender re.uires s!i$$ening in !he moun!ing ho"e areas#

Global % Precision error 16.4%

Error Estimate 8.7e-6 Btu

Von Mises Stress 19,7 !si

Ma"imum #is!lacement .$98 inc

S# 15 S #+ l ! ' #



S#e" 15) S*,e #+e *$*ls!s 'o%me$#

S*,e o%r 'o%me$#s

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13_v5_gpsfordesigner_ws_13_030402