class 10 - nvh
TRANSCRIPT
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NVH Category
NVH Characteristic Frequency (Hz)Steady State Frequency Response
Ride < 5
Shake 5 - 40 !!" #0 - $00 %!an $00 - $50 Structura& !rne N!ise $50 ' 500
ir !rne N!ise 500
Transient Response
Harshness #0 - $00
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Single Degree of Freedom
Control by
Dynamic
Stiffness
Control by
Mass
Control by
Damping
Isolation Region
2*n + *n
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,yna"ic Sti**ness
,yna"ic Sti**ness
(. - " /#) ' C /
.+1 ----------------------------------(. - " /#)#2 (C /)#
Mass M
Damping CStiffness
! " #$ %$f
f is t&e frequency
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'ure Tone
S!und at a sin3&e *requency
S!und ressure
' 6ecti7e "easure"ent d
' 8!3arith"ic !* s!und 9ressure
d'-:ei3hted t! adust *!r ear sensiti7ity
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Human Sensiti(ity
%!re c!nstant acr!ss *requency ran3e
;ith 7e&!city
Hearin3 ran3e #0 ' #000 Hz
,e9ends !n !7era&& &e7e&
S!und at !ne *requency "ay "ask 6y
!ther *requencies ,e9ends !n a3e se= and !ther *act!rs
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Tactile Response
Sub)ecti(e*+b)ecti(e
,cc
eleration
,cc
eleration
FrequencyFrequency
SR " -SR " -
SR " .SR " .
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Tactile Response
Sub)ecti(e*+b)ecti(e /#0
V
elocity
V
elocity
FrequencyFrequency
SR " -SR " -
SR " .SR " .
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S!und ressure 8e7e&
and :ei3htin3
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NVH Classification
9eratin3 C!nditi!n
' >d&e 8!; S9eed Cruisin3 ? :?
Su6ecti7e @7a&uati!n
' Shake !!" N!ise Harshness
6ecti7e %easure"ent
' S!und ressure cce&erati!n
Frequency Ran3e S!urce
' !;ertrain R!ad @=haust
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NVH Su6ecti7e Ratin3
%!st
?ar3etsN! Sa&e
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NVH +b)ecti(es
ssess 7ehic&e res9!nses re&ati7e t!
desi3n tar3ets
'?acti&e res9!nses
Seat track
Steerin3 c!&u"n
?!e 9an
'c!ustic res9!nses ,ri7erAs ear
Fr!nt assen3erAs ear
Rear 9assen3erAs ear
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S&a1e
5 ' 40 Hz
>d&e Shake
>s!&ated R!ad Shake R!u3h R!ad Shake
S"!!th R!ad Shake
' :hee&B?ire >"6a&ance' ?ire F!rce Variati!n
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Design For S&a1e
!dy 7ertica& &atera& 6endin3 and t!rsi!n"!des
Fr!nt end 6endin3 and t!rsi!n "!des
Fr!nt *&!!r "!des
Steerin3 c!&u"n "!des
Seat "!des
7!id stickiness !* the sh!ck and CV !intsthat causes hi3h *!rce in9ut and res!nancein s"!!th r!ad shake
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Design For S&a1e /#0
%!de se9arati!n and "!de sha9e
"ana3e"ent !* en3ine 6!unce r!&& 9itch
and ya; ri3id 6!dy "!des
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2oom
#0 - $00 Hz
>d&e !!"
>s!&ated R!ad !!" R!u3h R!ad !!"
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2ody Design for 2oom
$stand #nd*!re-a*t ac!ustic "!des
!dy $stand #nd!rder 7ertica& 6endin3
Fr!nt *&!!r 7ertica& 6endin3 ,ash 9ane& *!re-a*t 6endin3
uarter 9ane& 6endin3
Fue& tank 6!unce S9are tire tu6 6!unce
,eck&id &i*t3ate !r &!;er 6ack 9ane& 9u"9in3
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Structural 2orne Noise
$00 - 500 Hz
!;ertrain N!ise
R!u3h R!ad N!ise Dear :hine
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Design For Noise
Most of t&e (ibration energy imparted to t&e (e&icle
is belo3 4.5 H67
2elo3 4.5 H68
'!dy structure is i"9!rtant *!r c!ntr!&&in3 n!ise and7i6rati!n
' 8ack !* structure usua&&y resu&ts in c!st&y desi3n and
t!!&in3 chan3es
,bo(e 4.5 H68' Can 6e res!&7ed ;ith re&ati7e&y si"9&e structure
"!di*icati!ns such as 6ead 9atterns !r da"9in3
treat"entsE
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Design For Noise /#0
'o3ertrain 2ending Isolation
'o3ertrain 2rac1et Isolation
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0 5 10 15 20 25 30 35 40 45 50
CHASSIS/POWERTRAIN MODES
Ride Modes
Powertrain Modes
Suspension Hop and Tramp Modes
Suspension Longitudinal Modes
Exaust Modes
0 5 10 15 20 25 30 35 40 45 50
BODY/ACOUSTIC MODES
!od" #irst !ending $22H%&!od" #irst Torsion $25H%& Steering 'olumn #irst (erti)al !ending $2*H%&
0 5 10 15 20 25 30 35 40 45 50
EXCITATION SOURCES
+nerent Ex)itations $,eneral Road Spe)trum- Re)ipro)ating .n/alan)e- ,as Torue- et)&
Pro)ess (ariation Ex)itations $Engine- rieline- ))essor"- eel6Tire .n/alan)es&
#irst 7rder eel6Tire .n/alan)e $5895MPH&
(: +dle $5008550RPM&
Hot 'old
H%
H%
H%
#irst #6 )ousti) Modes $4:H%&
Modal C&art
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2ody*in*9&ite Targets
Static Sti**ness
' endin3
' ?!rsi!n
N!r"a& %!des
' Vertica& 6endin3
' ?!rsi!n
' 8atera& 6endin3
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Trimmed 2ody Targets
N!r"a& %!des
' Vertica& 6endin3
' ?!rsi!n
' 8atera& 6endin3
' Fr!nt end 6endin3
' Fr!nt end t!rsi!n
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Instrument 'anel:Column
Targets
N!r"a& %!des
' Vertica& 6endin3
' 8atera& 6endin3
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Seat Targets
N!r"a& %!des
' n ed9&ate
F!re a*t
8atera&
' >n Vehic&e
F!re a*t
8atera&
,i**erent r!; "ay ha7e di**erent tar3et
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Idle ;oad
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recipreciprecip amF ;=
borecrankboregas APPF ;&$ =
tan;;&$ hFFTrecipgastotal
+=
r
P/ore
P)ran
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)os)os rLh +=
2sin1)os = LL
)ossin1 2 rLh +=
2sin1)os =
L
r
sinsin =
r
P/ore
P)ran
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dt
duvw
dt
dvuw
dt
dwuv
dt
duvw
dt
dv
dt
du
dt
vud
dt
dunu
dt
du
dt
d
dt
d
dt
d
dt
d
n
n
++=
=
=
=
=
&$
sin)os
)ossin
1
r
P/ore
P)ran
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+=
=
+==
222
222
2
sin
sin)os
sin
sinsin)ossin
&)os)os$
rL
rr
rL
rrdtd
rLdt
d
dt
dhv
r
P/ore
P)ran
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=
+==
23
222
224
222
22
222
&sin$
sin)os
sin
2)os)os
&sin
sin)os
$sin&$
rL
r
rL
rr
rL
r
dt
dr
dt
dva
r
P/ore
P)ran
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Smoot& Road S&a1e
9& l:Ti I b l
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9&eel:Tire Imbalance
Definition Si"u&ati!n
' Shake caused 6y the un6a&anced inertia *!rces *r!" the
hi3h s9eed r!tati!n !* the un6a&anced ;hee& in 7ehic&e
cruisin3
8!ad
' $E0 !z-inch (Sensiti7ity) un6a&anced *!rce at the s9ind&es
' !th 7ertica& and *!re-a*t &!ads ;ith 7ertica& &!ad trai&in3
*!re-a*t &!ad 6y 0 de3rees
99&icati!ns
' Fr!nt ;hee& in-9hase Fr!nt ;hee& !ut-!*-9hase Rear ;hee&in-9hase and Rear ;hee& !ut-!*-9hase
9& l:Ti I b l
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9&eel:Tire Imbalance
Calculation
F 1 "r#
' F is i"6a&ance F!rce (N)
' " is i"6a&ance "ass (%3)
' r is i"6a&ance radius ("") is r!tati!n s9eed (radBsec)
F 1 $E0 !z-in 1 $E0 + #GE + $0-I(%3B!z) + #5E4
(""Binch) + 4 + #+ *# 1 0E0#G4 + *# (N)
' * is *requency (cyc&esBsec)
9& l:Ti I b l
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9&eel:Tire Imbalance
Speed Map
?he ;hee&Btire s9eed "a9 (*requency 7EsE
7ehic&e s9eed) is de9endent !n the ;hee&Btire
size the ;hee&Btire sti**ness and the 9ay&!ad
V 1 # + J + ?ire @**ecti7e Radius + Frequency H!;e7er the FrequencyBVehic&e S9eed(%H) is
ty9ica&&y ar!und 0E#
ased !n the a6!7e assu"9ti!n the *requencyran3e !* interest *r!" #5 %H t! $#5 %H is
' 5 Hz t! #5 Hz
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Tire Force Variation Definition
Si"u&ati!n
' Shake caused 6y the 7ariati!n !* the radia& sti**ness !*
the tires
8!ad' $E0 &6*(Sensiti7ity) 7ariati!n *!rce at the s9ind&es
' Vertica& &!ad !n&y
99&icati!ns
' Fr!nt ;hee& in-9hase Fr!nt ;hee& !ut-!*-9hase Rear
;hee& in-9hase and Rear ;hee& !ut-!*-9hase
Tire Force Variation
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Tire Force Variation
Speed Map
?he ;hee&Btire s9eed "a9 (*requency 7EsE7ehic&e s9eed) is de9endent !n the ;hee&Btiresize the ;hee&Btire sti**ness and the 9ay&!ad
V 1 # + J + ?ire @**ecti7e Radius + Frequency H!;e7er the FrequencyBVehic&e S9eed(%H) isty9ica&&y ar!und 0E#
ased !n the a6!7e assu"9ti!n the *requency
ran3es !* interest *r!" #5 %H t! $#5 %H are' First rder 5 Hz t! #5 Hz
' Sec!nd rder $0 Hz t! 50 Hz
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Roug& Road Noise
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Spatial 'SD Road 'rofile
S9atia& Frequency ( Cyc&es B "")
' :a7e nu"6er
' $ B ;a7e&en3th
S, "9&itude (""K# B (cyc&es B ""))
!;er Re3ressi!n na&ysis (L 1 $EMGM# + *57-