07_v5_gpsfordesigner_ws_7_030402

7/21/2019 07_v5_gpsfordesigner_ws_7_030402

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WS7-1CAT509, Workshop 7, March 2002

WORKSHOP 7

SEAT POST ASSEMBLY ANALYSIS


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WORKSHOP 7 SEAT POST

Problem Descriptio The sales department has inormed en!ineerin! that the seat post

keeps "reakin!#

$erorm an assem"led static anal%sis to determine &h% andrecommend a sol'tion# (e conser)ati)e "% 'sin! a desi!n case o

200 l"s or&ard on the seat#

$ost is Al'min'm

*lastic Mod'l's, * 10#15*+ psi

$oissons atio, 0#3.+

/ensit% #09 l"in3

ield Stren!th 13,77 psi

200 l"s

o&er and 4pper clamp is Steel

*lastic Mod'l's, * 29#0*+ psi

$oissons atio, 0#3

/ensit% #2. l"in3

ield Stren!th 3+,000 psi $ost

Clamp

7 inches


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WS7-.CAT509, Workshop 7, March 2002

WORKSHOP 7 SEAT POST

S!""este# E$ercise Steps

1#

pen the e6istin! CATA prod'ct in the Assem"l% /esi!n &ork"ench#2# Appl% material properties to all parts#

3# *6amine and )eri% assem"l% constraints#

.# Create an assem"l% static anal%sis doc'ment 8#CATAnal%sis#

5# $re-process initial inite element mesh#

+# Appl% $ropert% Connections#7# Appl% a clamp restraint#

# Appl% a moment load#

9# Comp'te the anal%sis#

10# :is'ali;e the anal%sis res'lts#

11# Comp'te a


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pen the CATA

prod'ct

&s7seat$ostass%#CAT

$rod'ct in theAssem"l% /esi!n

&ork"ench#

Steps%

&'Select


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WS7-+CAT509, Workshop 7, March 2002

Step (' Appl. m-teri-l properties to -ll p-rts

1

Steps%

&'/o'"le click the

post @$art

representation in theeat'res tree 8it sho'ld

t'rn "l'e# This makes

the post @/eined in

&ork and la'nches

%o' into the $art

desi!n &ork"ench#

('Click the Appl%

Material icon#

)'Acti)ate the Metal

ta" in the i"rar%

&indo

0'Select Al'min'm,

select B#

1'Make certain

material is applied

properl% in the tree#

Appl% Steel to the

lo&er and 'pper clamp

parts#

2' /o'"le click

seat$STass% to

access the assem"l%

&ork"ench#

3

2

.

+

5


7/52WS7-7CAT509, Workshop 7, March 2002

Steps%

&'o' sho'ld "e in theAssem"l% desi!n

&ork"ench#

('The seat$STass%

o"ect in the eat'res

tree is the $rod'ct and

considered @/eined in

&ork &hen "l'e#

)'Dotice the small

dierences in icons#

0' These are %o'r

main assem"l% tools#

1' *6amine the


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*6amine constraints

"et&een the post and

lo&er clamp#

Steps%

&'Select the

Wirerame 8DF

)is'ali;ation option#

('Fi!hli!ht each

constraint separatel%#

(asicall% all + de!rees

o reedom &ill "e

constrained# A !ood

check is to mo)e parts

aro'nd ar"itraril% &ith

the compass and then

'pdate#

Also, stress anal%sis

propert% connections

are applied to these

assem"l% constraints#

The !oal is to set'p a

staticall% determinate

model#

Step )' E$-mie -# 3eri4. -ssembl. costr-its

1

2



*6amine 'pper clamp

constraints#

Steps%

&'Fi!hli!ht each

constraint separatel%#

Step )' E$-mie -# 3eri4. -ssembl. costr-its

1



Step 0' +re-te - -ssembl. st-tic --l.sis #oc!met

G'st like "eore#

Steps%

&'



Step 0' +re-te - -ssembl. st-tic --l.sis #oc!met

Speci% 'ni='e

*6ternal Stora!e

director% locations#

Steps%

&'Select the Stora!e

ocation icon#

('Modi% the Res!lts

Stora!e ocation and

rename as sho&n#

)'Modi% the

+omp!t-tioStora!e

ocation and renameas sho&n#

0'>ood idea to



Step 1' Pre6process iiti-l 4iite elemet mes*

/eine inear !lo"al

inite element meshproperties or all parts#

Steps%

&'*dit each part mesh

indi)id'all% "% do'"le

clickin! CT** in

the eat'res tree#

(' Speci% !lo"al meshand sa! as sho&n or

the post, select B#

)'Speci% !lo"al mesh

and sa! as sho&n or

the clamps, select B#

*ach part can ha)e

'ni='e element t%pes#

The inear element is

s'!!ested or

comp'tational speed

'ntil &e achie)e a

staticall% determinate

model#

1

3

2



Step 2' Appl. Propert. +oectios

/eine a


14/52WS7-1.CAT509, Workshop 7, March 2002

Clampin!

re='irement

. inches

Step 7' Appl. - cl-mp restr-it

1

We onl% &ant to clamp

the "ottom . inches o

the post# Modiication

o the post#CAT$art is

re='ired#

Steps%

&'Select Windo& E

&s7seat$ost#CAT$rod'ct#

This chan!es %o'r

acti)e doc'ment and

la'nches %o' into the

Assem"l% /esi!n

Work"ench#




1We &ill create a

s'race that matches

%o'r clampin!

re='irements, then

@se& it onto the part#

Steps%

&'/o'"le clickin!

@post in the eat'restree &ill la'nch %o'

into the $art /esi!n

&ork"ench#

('


16/52WS7-1+CAT509, Workshop 7, March 2002


1

2

Sketch a shape#

Steps%

&'Select the normal

)ie& icon to see the

"ottom i necessar%#

(' Select the circle

icon and create a

circle as sho&n#




Constrain circle#Steps%

&'Select the

constraint icon#

(' Select the circle

pre)io'sl% created,

then the post o'tside

diameter# i!ht click E

Coincidence#

)' es'lt

0' Select the e6it

sketcher icon, this

takes %o' "ack to the

$art /esi!n

&ork"ench#

1

2

.

3




Create a s'race that

e6actl% represents

%o'r clampin! area##

Steps%

&'Select the *6tr'de

icon#

(' Select the sketch

%o' pre)io'sl% created

as the $roile# Be% in

limits as sho&n, select

B#

)' es'lt

1

2a

2"

3




Se&in! the *6tr'de#1

s'race onto the post

part#

Steps%

&'




1

3 2

Steps%

&'Select the Clamp

estraint

icon#

('Select the post area

that &e 'st se&ed as'race on, select B#

The clamp onl%

applies to the "ottom .

inches#

)'Dote the Clamp

o"ect added to the

eat'res tree#

. inches



Step ' Appl. - momet lo-#

2

.

3

Steps%

&'Select the Moment

icon#

('Select the . aces

&here the seat

attaches#

)'*nter -1.00 inch l"s

a"o't the %-a6is 8200 l"

6 7 inches#

0'Dote the Moment#1

o"ect added to the

eat'res tree#

1

2

200 l"

ma!e to sho&

The H% moment

7



Step 8' +omp!te t*e --l.sis

3

/e"'!!in!

sin!'larities#

Steps%

&' /o'"le click on the

Static Case Sol'tion#1

in the eat'res tree

and )eri% the !a'ss

sol'tion t%pe is

selected#

('Select the comp'te

icon#

)'Comp'te All, select

B#

0'Dote the reso'rces

estimation, select es#

1'Sin!'larit%

detected, select B#

2

.

5

1


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1

:is'ali;e &hat ca'ses

the sin!'larities so

%o' can properl%

restrain %o'r s%stem#

Steps%

&'Select the

/eormation icon#

('Dote the 'pperclamp part re='ires a

restraint#

)'n the eat'res tree

ri!ht click /eormed

Mesh o"ect then

select nacti)ate#

2

3


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WS7-2.CAT509, Workshop 7, March 2002


/eine the second


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2

Sho& the De4orme#

Mes*'

Steps%

&'Select the comp'te

icon#

('Comp'te All, select

B#

)'Dote the reso'rces

estimation, select es#

0' Dote all ima!es are

a)aila"le#

1'Acti)ate the

/eormed Mesh

ima!e#

Animate to )is'ali;e

"eha)ior#

1

3

.5

S &9 :i li * l i l


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WS7-2+CAT509, Workshop 7, March 2002

Step &9' :is!-li;e t*e --l.sis res!lts

1

:is'ali;e the assem"led

:o Misesstress ima!e

and M-$im!m

E$trem-s#

Steps%

&'Select the :on Mises

con#

('Select on the Search

ma!e *6trema icon#

)' Select >lo"al and

re='est 2 ma6im'm

e6trema at most, select

B#

2

3

St &9 :i li t* l i lt


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:is'ali;e Sectio +!tso the assem"led :o

Misesstress ima!e#

Steps%

&'Select C't $lane

Anal%sis con#

('4se the compass to

locate the c'ttin! planeas sho&n#

)' Modi% the c't plane

options to %o'r likin!,

select close#

e)ie& other areas#

3

1

2



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1

:is'ali;e the

assem"led Estim-te#

Error ima!e and

M-$im!m E$trem-s#

Steps%

&'Select the displa%

stress estimated

precision con#

('Select on the Search

ma!e *6trema icon#

)' Select >lo"al and

re='est 2 ma6im'me6trema at most, select

B#

%o' do not see the

*6trema s%m"ol look in

no sho

2

3



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Create an A#-pti3it.

Bo$to determine

Loc-l = Estim-te#

Error'

Steps%

&':eri% that the

*stimated *rror ima!e

is acti)e, and select the

Adapti)it% "o6 con#

('ocate and si;e the

adapti)it% "o6 as

sho&n#

)' Dote the ocal *rror.5#7I#

>lo"al error o 30I

and local error o .5I

is 'naccepta"le#

ecommend ma6 o

20I and 10I

respecti)el%#

Chan!in! to a$ara"olic element t%pe

mesh &ill %ield the

precise )al'es, "'t

comp'tational time is

appro6# 1 ho'r#

n the interest o time,

sta% &ith linear

elements or this class#

1a

1"

3

2

Step &9 :is!-li;e t*e --l.sis res!lts


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1

:is'ali;e theassem"led

Displ-cemetima!e#

Steps%

&'Select the

/isplacement ma!e

con#

('/o'"le clickTranslational

displacement o"ect in

the eat'res tree to edit

ima!e parameters#

)' Click on A)era!e-so

in :is' ta" to s&itch

displa%, select B#

2

3



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:is'ali;e the :o

Misesstress or the

post#Steps%

&'Select the :on

Mises icon 8this

deacti)ates the acti)e

ima!e and acti)es :on

Mises#

('/o'"le click :on

Mises in the eat'res

tree to edit the ima!e#

)' Select the

Selections ta" then

CT** Tetrahedron

Mesh#1Jpost#1 o"ect,

select B#

0' i!ht click *6tremain eat'res tree then

select Loc-l !p#-te'

1' i!ht click >lo"al

Ma6im'm#1 then select

>oc!s o# /o'"le click

to see the ima!e

e6trem'm e#itor#

2

1

3

5a

.

5"



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WS7-3.CAT509, Workshop 7, March 2002


:is'ali;e the :o

Misesstress or the

lo&er Clamp#

Steps%

&'/o'"le click :on



(' Select the

Selections ta" then

CT** Tetrahedron

Mesh#2Jlo&erClamp#1

o"ect, select B#

)' i!ht click *6tremain eat'res tree then





to see the ima!e

e6trem'm e#itor#

1

2

.a

3

."



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:is'ali;e the :o

Misesstress or the

'pper Clamp#

Steps%

&'/o'"le click :on



(' Select the

Selections ta" then

CT** Tetrahedron

Mesh#3J'pperClamp#1

o"ect, select B#

)' i!ht click *6tremain eat'res tree then





to see the ima!e

e6trem'm e#itor#

1

2

.a

."

3



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WS7-3+CAT509, Workshop 7, March 2002


:is'ali;e the :o

Misesstress locali;ed

at the clamp#

Steps%

&':eri% the :on Mises

Stress ima!e is acti)e#Then do'"le click to

edit the ima!e in the

eat'res tree#

(' Select the

Selections ta", then

the Clamp#1, select

B#

)' i!ht click on >lo"alMa6im'm#1 then select

ocal 'pdate to ind

ma6 stress on this

selection#

Also e6amine the

Moment#1#

1

2a

2"

3



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.

5a


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1

.

7

23

5


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Step &&' >re?!ec. ,Mo#-l/ --l.sis 4or t*e -ssembl.

Start "% insertin! a

ne& re='enc%

anal%sis &ith restraints#

Steps%

&'re?!ec. ,Mo#-l/ --l.sis 4or t*e -ssembl.


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WS7-.0CAT509, Workshop 7, March 2002


Create mass

e='ipment#

Steps%&'Select the mass

icon#

('Select o'r inner

aces as the s'pports#

)'Be% in 200 l" as the

mass, select B#

1

3

2

Step && >re?!ec. ,Mo#-l/ --l.sis 4or t*e -ssembl.


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Speci% sol'tion

parameters#

Steps%

&'/o'"le click


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1

2

3a

:is'ali;e the res'lts#

Steps%

&'Select the

/isplacement ima!e

icon#

('/o'"le clickTranslational

displacement in the

eat'res tree to edit

ima!e parameters#

)'Click the


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Step &('


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WS7-..CAT509, Workshop 7, March 2002

Step &('


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Step &('


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WS7-.+CAT509, Workshop 7, March 2002

Step &)' S-3e t*e --l.sis #oc!met

Steps%

&'


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p

P-r-bolic elemets

Step &0' Precise Res!lts


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WS7-.CAT509, Workshop 7, March 2002

p

:o Mises @it*

P-r-bolic elemets



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p

:o Mises Post E$trem-@it* P-r-bolic elemets



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p

:o Mises Lo@er +l-mp

E$trem- @it* P-r-bolicelemets



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p

:o Mises Cpper +l-mp

E$trem- @it* P-r-bolic

elemets


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