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WS6-1CAT509, Workshop 6, March 2002
WORKSHOP 6
REAR RACK (MODAL) ANALYSIS
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WS6-2CAT509, Workshop 6, March 2002
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WS6-3CAT509, Workshop 6, March 2002
WORKSHOP 6 REAR RACK
Problem Descripio! Assume the dynamc characterstcs o! ths "ke #th a 200 $" person
tra%e$n& at '0 mph do#n a co""$e stone road s( Mode 1)95 *+, Mode 2) 100 *+, Mode 3 ) 110 *+, Mode ' ) 120 *+, Mode 5 ) 135 *+
A rear rack accessory capa"$e o! supportn& 150 $"s may "e attached tothe !rame ou are asked to ana$y+e ths rack under dynamc $oadn&
.er!orm a norma$ modes ana$yss to determne ! the !re/uency o! the"ke s c$ose to one o! the natura$ !re/uences o! the rack Ths s to a%od
ecess%e %"ratons and !nd so!t spots smooth, com!orta"$e rde4
A$umnum
$astc Modu$us, 10156 ps
.ossons 7ato, 03'6
8ensty 09 $":n3
e$d Stren&th 13,;; ps
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WS6-'CAT509, Workshop 6, March 2002
WORKSHOP 6 REAR RACK
S"##ese$ E%ercise Seps
1
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WS6-5CAT509, Workshop 6, March 2002
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WS6-6CAT509, Workshop 6, March 2002
Sep Appl. -l"mi!"m m-eri-l properies o +e p-r
1
Seps&
'C$ck the .artrepresentaton n the
!eatures tree
C$ck the App$y
Matera$ con
*Act%ate the Meta$
ta" n the "rary#ndo#
/Se$ect A$umnum
0Se$ect
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7/22WS6-;CAT509, Workshop 6, March 2002
Sep * Cre-e - 1re2"e!c. -!-l.sis $oc"me!
Seps&
'Start a @SA
#ork"ench
Se$ect >re/uency
Ana$yss, se$ect re/uency
Ana$yss document&ets automatca$$y
li!3e$to the CAT.art
/Eote( your pre%ous
resu$ts and
computatons stora&e
$ocaton de!au$ts to
your $ast path used
2
3
1
'
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8/22WS6-CAT509, Workshop 6, March 2002
Sep * Cre-e - 1re2"e!c. -!-l.sis $oc"me!
Spec!y un/ueterna$ Stora&e
drectory $ocatons
Seps&
'Se$ect the Stora&e
ocaton con
Mod!y the Res"ls
Stora&e ocaton and
rename as sho#n
*Mod!y the
Comp"-io!Stora&e
ocaton and rename
as sho#n
/Eote the nksMana&er n the
spec!caton tree
re!$ects the paths
0Fse Sa%e
Mana&ement to sa%e
CATAna$yss doc as
rear7ack
2
3
'
1
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9/22WS6-9CAT509, Workshop 6, March 2002
Sep / Pre4process i!ii-l 5i!ie eleme! mes+
1Measure to determne
nta$ mesh and sa&
s+e
Seps&
'8ou"$e C$ck the
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10/22WS6-10CAT509, Workshop 6, March 2002
Sep / Pre4process i!ii-l 5i!ie eleme! mes+
8e!ne the &$o"a$ !nte
e$ement mesh
propertes
Seps&
'Dey n 0125n
&$o"a$ mesh s+e
7ecommended Sa&
) 10I o! @$o"a$ S+e,
key n 0013n
*Spec!y e$ement
type near, se$ect
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11/22WS6-11CAT509, Workshop 6, March 2002
Sep 0 Appl. - cl-mp resr-i!
1
3
2
Seps&
'Se$ect the C$amp
7estrant
con
Se$ect the nner
!ace #here the rack
attaches to the !rame,
se$ect
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12/22WS6-12CAT509, Workshop 6, March 2002
Sep 6 Appl. - m-ss e2"ipme! lo-$
1
'
3
Seps&
'Se$ect the Mass con
Se$ect the 2 !aces as
sho#n*nter 150 $"s as the
mass, se$ect
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13/22WS6-13CAT509, Workshop 6, March 2002
Sep Comp"e +e -!-l.sis
2
Spec!y the num"er o!
%"raton modes to
computeSeps&
'8ou"$e c$ck on the
>re/uency Case
So$uton n the spec
tree
Dey n 5 %"raton
modes to compute
*Se$ect $anc+os as
the compute method
/Spec!y mamum
num"er o! teratons
and accuracy
0Se$ect
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14/22WS6-1'CAT509, Workshop 6, March 2002
Sep Comp"e +e -!-l.sis
1
2Seps&
'Se$ect the Compute
con
Compute the
>re/uency Case
So$uton1, se$ect
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15/22WS6-15CAT509, Workshop 6, March 2002
Sep 7 8is"-li9e +e -!-l.sis res"ls
1
?sua$+e the mamum
dsp$acements to
$ocate the areas o! ma
stran ener&y
Seps&
'Se$ect the
8sp$acement =ma&e
=con
8ou"$e c$ck to edt
ma&e parameters
* Se$ect A%era&e-=so
n ?su ta" to s#tch
dsp$ay
/ Se$ect =so:>rn&e
then se$ect =S
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16/22WS6-16CAT509, Workshop 6, March 2002
Sep 7 8is"-li9e +e -!-l.sis res"ls
8sp$ay a$$ 5 dynamc
modes
Seps&
'8ou"$e c$ck
Trans$atona$
dsp$acement
ma&ntude to edt
ma&e parameters
?e# the dsp$ayed
!re/uency under ta" -
>re/uences
* Se$ect and eamne
each mode
Eote the Trans$atona$
dsp$acement
ma&ntude %a$ues are
ar"trary The
dsp$acement
dstr"uton and
>re/uency s #hat #e
#ant
1
2
3
Trans$atona$ dsp$acement Ma&ntude
Mode 1 .rmary Bendn&
60 nch
Mode 2 .rmary Bendn&
101 nch
Mode 3 Torson
2 nch
Mode ' Secondary Bendn&
133 nch
Mode 5 Secondary Bendn&15 nch
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17/22WS6-1;CAT509, Workshop 6, March 2002
Sep 7 8is"-li9e +e -!-l.sis res"ls
1
2
3
Anmate a$$ 5 dynamc
modes
Seps&
'The Trans$atona$
dsp$acement
ma&ntude ma&e must
"e act%e
Se$ect the Anmate
an Ana$yss =ma&e
con
* Se$ect Current
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18/22WS6-1CAT509, Workshop 6, March 2002
Sep 7 8is"-li9e +e -!-l.sis res"ls
1
2
3
5
Mode 0has the
&reatest dsp$acement,
$ocate the e$ement o!mamum stran
ener&y
Seps&
'The Trans$atona$
dsp$acement
ma&ntude ma&e must
"e act%e Then dou"$e
c$cked
Se$ect mode
num"er 5 to make t
the current
occurrence, se$ect
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19/22WS6-19CAT509, Workshop 6, March 2002
Sep : ;e!er-e - repor
A!ter act%atn& each
mode ma&e at $east
once, &enerate a
report
Seps&
'Se$ect the Basc
Ana$yss 7eport con
Se$ect an
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20/22WS6-20CAT509, Workshop 6, March 2002
Co!cl"sio!s Comparn& the natura$ !re/uency o! the !rst 5 dynamc mode shapes sho#s a $ar&e
d!!erence Ths %er!es that #e #$$ ha%e smooth rde so!t spots durn& ths $oad case
Sep : ;e!er-e - repor
Mode
Eum"er
Bke >re/uency*+ cyc$es:sec4
7ack >re/uency *+
.ara"o$c $ements
1 95 9';
2 100 9;1
3 110 3166
' 120 '050
5 135 6136
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Sep '
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