IS/ISO 4412-2: Hydraulic Fluid Power - Test Code for Determination of Airborne Noise Levels, Part 2: Motors

26 Pages·1991·2.2 MB·English

by  Bureau of Indian Standards

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“The Right to Information, The Right to Live” “Step Out From the Old to the New”
IS/ISO 4412-2 (1991): Hydraulic Fluid Power - Test Code for
Determination of Airborne Noise Levels, Part 2: Motors [PGD
16: Fluid Power]
“!ान $ एक न’ भारत का +नम-ण”
Satyanarayan Gangaram Pitroda
““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee””
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै”
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“Knowledge is such a treasure which cannot be stolen”

IS/IS0 4412-2 : 1991

Indian Standard
CILUARDYH FLUID POWER TSET- CODE ROF
NOITANIMRETED FO AIRBORNE ESION LEVELS
PART 2 MOTORS
UDC 522.126 : 64.538.435

0 SIB 5991
BUREAU OF INDIAN STANDARDS
KANAM ,NAVAHB 9 RUDAHAB HAHS RAFAZ GRAM
NEW IHLEP 200011

August 5991 Price Group 8
ciluardyH diulF rewoP smetsyS lanoitceS Committee, EP 51
LANOITAN FOREWORD
sihT naidnI dradnatS hcihw si lacitnedi htiw 0.SI 2-2144 : 1991 ciluardyH‘ diulf rewop - tseT edoc rof
noitanimreted fo enrobria esion slevel - traP :2 ,’srotoM deussi yb eht lanoitanretnI noitazinagrO rof
noitazidradnatS ,)OSI( saw detpoda yb eht uaeruB fo naidnI sdradnatS no eht noitadnemmocer fo eht
ciluardyH diulF rewoP smetsyS lanoitceS Committee dna lavorppa fo eht noitcudorP gnireenignE I
noisiviD .licnuoC
ehT txet fo eht 0SI dradnats sah neeb devorppa sa elbatius rof noitacilbup sa naidnI dradnatS tuohtiw
.snoitaived niatreC snoitnevnoc era revewoh ton lacitnedi ot esoht desu ni naidnI .sdradnatS noitnettA .
si ylralucitrap nward ot eht :gniwollof
a) Wherever eht sdrow lanoitanretnI‘ ’dradnatS raeppa gnirrefer ot siht ,dradnats yeht dluohs eb
daer sa naidnI‘ .’dradnatS
b) Comma (J sah neeb desu sa a lamiced marker ni eht lanoitanretnI dradnatS elihw ni naidnI
,sdradnatS eht tnerruc ecitcarp si ot esu tniop (.) sa eht lamiced marker.
nI eht detpoda dradnats ecnerefer sraeppa ot niatrec lanoitanretnI hcihwrofsdradnatS naidnI sdradnatS
osla .tsixe ehT gnidnopserroc naidnI sdradnatS hcihw era ot eb detutitsbus ni rieht evitcepser ecalp
era detsil woleb gnola htiw rieht eerged fo ecnelaviuqe rof eht snoitide :detacidni
International Standard Corresponding Indian Degree of ,
Standard Correspondence
0SI 2204 : 9791 scitsuocA - ediuG ot 5I 6789 : 1891 ediuG ot -erusaem toN
lanoitanretnI sdradnatS no eht meas- tnem fo enrobria lacitsuoca esion tnelaviuqe
tnemeru fo enrobria lacitsuoca esion dna noitaulave fo sti stceffe no
dna noitaulave fo sti stceffe no namuh nam
sgnieb
0SI 8443 : 5791 lairtsudnI diuqil SI 6649 0891: ytisocsiV -salc yllacinhceT
stnacirbul - 0SI ytisocsiv -acifissalc noitacifis fo lairtsudni diuqil tnelaviuqe
noit stnacirbul

0SI 8955 : 5891 diulF rewop systems SI 61401 : 2991 diulF rewop -sys lacitnedI
dna stnenopmoc - yralubacoV snret dna stnenopmoc -
yralubacoV (first revision)
CEI buP 156 : 9791 dnuoS level meters SI 9779 : 1891 dnuoS level meters yllacinhceT
tnelaviuqe
ehT lacinhcet committee elbisnopser rof eht noitaraperp fo siht dradnats sah deweiver eht snoisivorp
fo gniwollof 0SI sdradnats dna sah dediced taht yeht era elbatpecca rof esu ni noitcnujnoc htiw siht
:dradnats
0Sl 3744 : 189.1 scitsuocA - noitanimreteD fo dnuos rewop slevel fo esion secruos
- gnireenignE sdohtem rof dleif-eerf snoitidnoc revo a gnitcelfer
enalp
0SI 5473 : 7791 scitsuocA - dnuoS rewop slevel fo esion secruos - noisicerP
sdohtem rof ciohcena dna ciohcena-imes rooms
0SI 6743-4 : 2891 ,stnacirbuL lairtsudni dna*lio detaler stcudorp ( ssalc L ) - -acifissalC
noit - traP :4 ylimaF H ( ciluardyH systems )
CEI 05 )108( : 4891 lanoitanretnI lacinhcetortcele yralubacov - retpahC 108 : scitsuocA
dna scitsuoca-ortcele
IS/IS0 4412-2 : 1991
Indian Standard
CILUARDYH FLUID POWER - l-EST CODE ROF
DETERMtNATlON FO AIRBORNE ESION LEVELS
PART 2 MOTORS
1 epocs 2 Normative references
ehT gniwollof sdradnats niatnoc snoisivorp ,hcihw
sihT trap fo 0SI 2144 sehsilbatse a tset edoc -ed hguorht ecnerefer ni siht ,txet etutitsnoc snoisivorp
gnibircs ,serudecorp desab no 0SI ,4022 rof eht -ed fo siht trap fo 0SI .2144 tA eht time fo ,noitacilbup
noitanimret fo eht dnuos rewop slevel fo a ciluardyh eht snoitide detacidni erew .dilav llA sdradnats era
diulf rewop motor, rednu dellortnoc snoitidnoc fo -ni tcejbus ot ,noisiver dna seitrap ot stnemeerga desab
noitallats dna ,noitarepo elbatius rof gnidivorp a -ab no siht trap fo 0SI 2144 era degaruocne ot -itsevni
r>* gnirapmoc eht esion fo.slevel motors ni terms etag eht ytilibissop fo gniylppa eht most tnecer -ide
Sk
:fo snoit fo eht sdradnats detacidni .woleb Members fo
CEI dna 0SI niatniam sretsiger fo yltnerruc dilav -nI
- dethgiew-A dnuos rewop ;level lanoitanret .sdradnatS
- evatco dnab dnuos rewop .slevel 0SI ,5791:8443 Industrial liquid lubricants - IS0 vis-
cosity classification.
From eseht dnuos rewop ,slevel fi ,deriuqer refer-

ecne dnuos erusserp slevel may eb detaluclac rof 0SI ,1891:4473 Acoustics - Determination of sound
gnitroper sesoprup ni ecnadrocca htiw xenna .A power levels of noise sources - Engineering meth-
ods for free-field conditions over a reflecting .enalp
For lareneg ,sesoprup eht ycneuqerf egnar fo -retni
tse sedulcni eht evatco sdnab htiw ertnec fre- 0SI ,7791:5473 Acoustics - Determination of sound
seicneuq neewteb 521 zH dna 0008 11.zH power levels of esion sources - Precision methods
for anechoic and semi-anechoic rooms.
euD ot eht tnerehni seitluciffid ni eht tnemerusaem
fo deeps-wol motor ,ecnamrofrep siht trap fo 0SI ,5891:8955 Fluid power systems and components
0SI 2144 si detimil ot motors gnitarepo ta sdeeps - .yralubacoV
gnideecxe 05 .nim/r
0SI ,2891:4-3476 Lubricants, industrial oils and re-
senilediuG rof eht noitacilppa fo siht trap fo 0SI 2144 lated products ssalc( L) - Classification - Part 4:
era nevig ni xenna C.
Family H (Hydraulic systems).
sihT trap fo 0SI 2144 si elbacilppa ot lla sepyt fo CEI ,4891:)108(05 international Electrotechnical Vo-
ciluardyh diulf rewop motors gnitarepo rednu yralubac - Chapter 801: Acoustics and electro-
etats-ydaets ,snoitidnoc evitdepserri fo ,ezis tpecxe acoustics.
rof yna snoitatimil desopmi yb eht ezis fo eht tset
tnemnorivne ees( esualc .)5 CEI ,9791:156 Sound level meters
)1 1 zH - 1 g_-’
1
Is/is0 4412-2: 1991
NOTE 4 ehT gnithgiew krowten ro eht htdiw fo the fre-
3 Definitions
quency band used should always be indicated. The refer-
roF eht sesoprup fo siht trap fo 0SI ,2144 eht -ifed ence sound power is 1 pW’.
snoitin nevig ni 0SI ,8955 CEI 05 dna eht gniwollof
snoitinifed .ylppa tI is detpecca taht eht rettal -ifed 3.6 volume of source under test: emuloV fo eht -ne
snoitin yam reffid morf esoht ni rehto specific -retnI e’polev fo eht elohw rotom rednu .tset
lanoitan .sdradnatS
3.1 free sund field: dnuoS dleif ni a ,suoenegomoh
ciportosi muidem eerF fo .seiradnuob 4 Measurement uncertainty
NOTE 1 In practice, it is a field in which the effects of sdohteM fo tnemerusaem dluohs eb desu hcihw
the boundaries are negligible over the frequency range dnet ot tluser ni dradnats snoitaived hcihw era lauqe
of interest. ot ro ssel naht esoht deificeps ni elbat .1 sdohteM
nevig ni 0SI 4473 teem siht .tnemeriuqer
3.2 free field over a reflecting plane: dleiF decudorp
yb a ecruos ni eht ecneserp fo eno gnitcelfer enalp
no hcihw eht ecruos is .detacol Table 1 - Standard deviation of sound power level
determinations
3.3 reverberant sound field: tahT noitrop fo eht
Standard deviation, dB,
dnuos dleif ni a tset room over which the influence
for octave bands centred on:
of sound received directly from the source is negli-
.elbig
4.3 anechoic room: A tset moor gnivah seiradnuob
hcihw yllaitnesse,brosba lla fo eht tnedicni dnuos
ygrene revo eht ycneuqerf egnar fo ,tseretni ybereht
gnidroffa dleif-eerf snoitidnoc revo eht tnemerusaem
ehT dradnats snoitaived nevig ni elbat 1 edulcni eht
.ecafrus
stceffe fo elbawolla snojtairav ni‘ eht gninoitisop fo
eht tnemerusaem stniop dna ni eht noitceles fo yna
5.3 mean-square sound pressure: ehT dnuos
erusserp degareva ni ecaps dna emit no a -naem debircserp tnemerusaem ,ecafrus tub edulcxe -irav
snoita ni eht dnuos rewop tuptuo fo eht ecruos morf
erauqs .sisab
tset ot .tset
NOTE 2 In practice, this is estimated by space and time
averaging over a finite path length or over a number of NOTE 5 The A-weighted sound power level will in most
fixed microphone positions. practical cases be determined with a standard-deviation
of approximately 2 dB.

3.6 mean sound pressure level: neT se mit eht -gol
mhtira ot eht esab 01 fo eht ottar fo eht erauqs-naem
dnuos er.usserp ot eht erauqs fo eht ecnerefer dnuos
,erusserp ni slebiced .)Bd( 5 Test environment
NOTE 3 ehT gnithgiew network or the width of the fre- Tests llahs eb detcudnoc ni na tnemnorivne hcihw
quency band used should always be indicated; for exam- sedivorp dleif-eerf“ revo a gnitcelfer ”enalp ro
ple, A-weighted sound pressure :evel, octave band sound laiceps“ ”tnarebrever snoitidnoc hcihw teem eht
pressure level. The reference sound pressure is 20 lIPa*). latnemnorivne noitacifilauq stnemeriuqer debircsed
ni IS0 3744:1981, clause 4 and annex A.
3.7 sound power level: neT semit eht mhtiragol ot
eht esab 01 fo eht oitar fo a nevig dnuos rewop ot For more precise measurements, conduct stset ni
eht ecnerefer dnuos ,rewop ni .slebiced ecnadrocca htiw 0SI .5473
1
2) ItPa = 10-s N/m2
3) 1 wp = 21-01 w 2
is/Is0 4412-2: 1991
2.4.7 ehT tset diulf dna eerged fo noitartlif llahs eb
6 Instrumentation
ni ecnadrocca htiw eht rotom s’rerutcafunam -cer
.snoitadnemmo
6.1 ehT noitatnemurtsni desu ot erusaem diulf
,wolf diulf ,erusserp rotom deeps dna diulf -arepmet
3.4.7 telnI dna egrahcsid senil llahs eb dellatsni
erut llahs eb ni ecnadrocca htiw eht -nemmocer
htiw sretemaid ni ecnadrocca htiw eht -cafunam
snoitad rof lairtsudni“ ”ssalc ycarucca fo ;gnitset .e.i
’srerut dednemmocer .ecitcarp
ssalc C nevig ni xenna .B
4.4.7 ehT teltuo erusserp eguag llahs eb detnuom
6.2 ehT noitatnemurtsni desu rof lacitsuoca ta eht emas thgieh sa eht teltuo sgnittif ro ti llahs eb
stnemerusaem llahs eb ni ecnadrocca htiw CEI .156 detarbilac rof yna thgieh .ecnereffid
This noitatnemurtsni llahs eb ni ecnadrocca htiw
0SI 4473 rof htob ecnamrofrep dna ;noitarbilac .e.i 5.4.7 erusserP snoitautculf dna gnidnats sevaw ni
epyt 2 stnemurtsni rof gnireenigne edarg( )2 eht telni dna teltuo strop llahs eb deziminim yb such
.stnemerusaem serusaem sa detceles enil ,shtgnel gnol shtgnel fo
elbixelf ,esoh ,srotalumucca enilni srecnelis dna -ni
enil noitaslup .spmup
7 Installation conditions
6.4.7 A elbats daol evlav llahs eb desu ni eht teltuo
7.1 Motor location enil if kcab erusserp is .detaluger
ehT rotom yam eb detacol ni yna noitisop tnetsisnoc NOTE 6 Unstable load valves in the lines can etareneg
htiw eht ecruos noitallatsni dna tnemerusaem sur- and transmit noise through the fluid and piping which can
ecaf ro( enohporcim )esrevart stnemeriuqer -iceps emerge as airborne sound at the motor.
deif ni 0SI 4473 rof eht tset tnemnorivne gnieb .desu
7.4.7 ynA fortnoc sevlav llahs eb denoitisop raf
morf eht ,rotom ylbareferp edistuo eht tset ,moor ot
2.7 Motor mounting eziminim eht .noitcaretni
7.2.1 ehT rotom gnitnuom llahs eb detcurtsnoc os 8.4.7 llA diulf senit dna sevlav ni eht tset ecaps
taht ti lliw eziminim eht esion detaidar yb *eht llahs eb depparw htiw gnitalosi-dnuos ,slairetam if
gnitnuom sa a tluser fo rotom .snoitarbiv deriuqer ees( .)1.01 lairetaM gnivah a -dnuos
noissimsnart ssol fo ta tsael 01 Bd ta 521 ,zH dna a
2.2.7 ehT gnitnuom tekcarb llahs eb detcurtsnoc fo retaerg ssol ta rehgih ,seicneuqerf llahs eb .desu
gnipmad-hgih lairetam ro htiw gnipmad-dnuos dna
gnitalusni-dnuos lairetam deilppa ot eht tekcarb sa
8 Operating conditions
.deriuqer

8.1 enimreteD eht dnuos rewop slevel fo eht rotom
3.2.7 noitarbiV noitalosi ,seuqinhcet if ,dedeen rof yna derised tes fo gnitarepo snoitidnoc ees(
llahs eb desu neve if eht rotom is yllausu yleruces .)7.3.11
.detnuom
8.2 esehT tset snoitidnoc llahs eb deniatniam
4.2.7 egnalF sgnitnuom taht era sa llams sa -carp tuohguorht eht tset nihtiw eht stimil nevig ni elbat .2
lacit llahs eb desu os sa ot eziminim ecnerefretni
htiw noitaidar fo dnuos sdrawot eht ?fahs dne fo eht
Table 2 - Allowable variations of mean indicated
.rotom
values of controlled parameters
7.3 Motor-driven load Test parameter Allowable variation
ehT daol metsys llahs eb detacol edistuo eht tset Pressure +2 %
ecaps dna eht daol llahs eb nevird hguorht elbixelf Speed + 2 %
sgnilpuoc dna na etaidemretni ,tfahs ro eht daol
Temperature f2 “C
metsys llahs eb detalosi ni na citsuoca .erusolcne
Torque *2 %
7.4 Hydraulic circuit
8.3 ehT rotom llahs eb detset ni eht
7.4.1 ehT tiucric ;lahs edulcni lla lio ,sretlif lio ”dereviled-sa“ noitidnoc htiw yna yrallicna -piuqe
,srelooc sriovreser dna rotcirtser sevlav sa deriuqer tnem gnitarepo yllamron gnirud eht ,tset os sa ot
ot teem eht rotom ciluardyh gnitarepo snoitidnoc edulcni rieht esion snoitubirtnoc ot eht enrobria
ees( esualc .)8 esion level fo eht .rotom

3
IS/SO 4412-2: 1991
9 Location and number of sound sysrem dna ot ezilibats lla ,selbairav gnidulcni diulf
,noitidnoc ot nihtiw eht stimil deificeps ni elbat 7
measurement points
erusaeM eht gniwollof rof hcae :tset
ehT noitacol dna rebmun fo tnemerusaem stniop
llahs eb sa deriuqer ,yb 0SI 4473 rof eht dohtem fo )a rotom ;deeps
tnemerusaem detceles rof eht rotom esion .tset
)b tuptuo ;euqrot
10 Test procedure
lc diulf erutarepmet dna erusserp ta rotom telni dna
diulf erusserp ta egrahcsid sgnittif ro ta eht tset
10.1 Background noise measurements tniop dedivorp yb eht rotom ;rerutcafunam
10.1.1 erusaeM eht dnuorgkcab esion fo tseretni )d dnab dnuos erusserp slevel ta hcae -erusaem
taht is tneserp gnirud eht rotom esion tset hcihw tnem tniop revo eht ycneuqerf egnar fo ;tseretni
seod ton etaname morf eht rotom .flesti
)e dethgiew-A dnuos erusserp level ta hcae
revO eht ycneuqerf egnar fo ,tseretni eht dnab tnemerusaem .tniqp
dnuos erusserp slevel fo siht dnuorgkcab esion llahs
eb ta tsael 6 Bd woleb eht rotom dnab dnuos
erusserp slevel ta hcae tnemerusaem .tniop 10.2.2 New or rebuilt motors
2.1.01 tcerroC rof siht dnuorgkcab ,esion if -ive 10.2.2.1 taepeR eht laitini rotom tnemerusaem tset
decned yb eseht ,stnemerusaem yb gniylppa eht fo eht seires ta eht dne fo a tset seires ro retfa 1 h
snoitcerroc rof siht esoprup nevig ni 0SI .4473 fo .gnitset
3.1.01 When tnemerusaem fo dnab slevel fo -kcab
2.2.2.01 If eht dethgiew-A dnuos level ta yna -es
dnuorg esion is ton ,lacitcarp eht dethgiew-A -kcab
detcel tnemerusaem tniop seod ton etacilpud taht
dnuorg dnuos level fo hcae tnemerusaem tniop llahs
fo eht first tset nihtiw 2 Bd ,)A( eht elohw tset seires
eb ta tsael 6 Bd woleb eht rotom dethgiew-A dnuos
llahs eb .detadilavni
.level
tcerroC eseht dethgiew-A stnemerusaem rof -kcab
dnuorg .esion
11 Information to be recorded
NOTES
7 Easing the requirements for backgrou nd noise levels 11.1 Specifications
nac lead to an overestimate of the m otor band sound

pressure levels. ehT noitamrofni nevig ni 2.11 dna 3.11 llahs eb
delipmoc dna dedrocer rof lla stnemerusaem edam
8 The A-weighted background sound level at each gnidrocca ot eht stnemeriuqer fo siht trap fo
measurement point may be checked by covering the mo-
0SI .2144
tor with sound-insulating materials capable of a trans-
mission loss of at least 10 dl3 over the frequency range
which is “determining” the A-weighted sound level of the
motor. 2.11 General information
10.1.4 If eht dnuorgkcab level is dnuof ot eb oot eman dna sserdda fo eht rotom rerutcafunam
,hgih kcehc rof rehtruf esion lortnoc fo eht rotom ,dna if ,elbacilppa eht ;resu
,gnitnuom nevird daol ro ciluardyh ,tiucric sa -idni
.detac )b ecnerefer )s(rebmun rof noitacifitnedi fo eht -om
,rot
51.OI erusnE taht eht noitatneiro fo eht -orcim
lc eman dna sserdda fo snosrep ro noitazinagro
enohp dna eht doirep fo noitavresbo era sa deificeps
elbisnopser rof eht citsuoca stset no eht ;rotom
ni 0SI .4473
)d etad dna ecalp fo citsuoca ;stset
10.2 Motor measurements
)e tnemetats taht eht dnuos rewop slevel fo eht
10.2.1 Measurement sequence rotom evah neeb deniatbo ni lluf ecnamrofnoc
htiw siht l-tap fo 0SI 2144 dna 0SI 4473 rof eht
roirP ot tnemecnemmoc fo a seires fo ,stset etarepo noitanimreted fo dnuos rewop slevel fo esion
eht rotom rof a tneiciffus emit ot egrup ria morf eht secruos ees( osla esualc .)31
4
c
Is/IS0 4412-2 : 1991
11.3 Motor under test 11.3.5 Location of motor in test envlronment
11.3.1 Description of motor 11.3.5.1 edulcnI a hcteks gniwohs eht noitacol fo
eht rotom ni noitaler ot ,sllaw roolf dna gniliec fo eht
4 epyt fo rotom .g.e( raeg ro ,)notsip gnidulcni -na tset .moor
yrallic ;tnempiuqe
11.3.5.2 wohS no siht hcteks eht noitacol fo rehto
b) epyt fo tnemecalpsid .g.e( dexif ro ;)elbairav gnitcelfer ro gnibrosba sneercs dna esion secruos
hcihw nac ecneulfni .stnemerusaem
lc rotom llarevo raenil snoisnemid htiw( hcteks if
;)yrassecen 11.3.6 Instrumentation
)d rotom mumixam ;tnemecalpsid )a sliated fo tnempiuqe desu ot rotinom rotom -po
gnitare snoitidnoc ees( ,)7.3.11 gnidulcni ,epyt
)e epyt fo tnemecalpsid rellortnoc dna .gnittes laires rebmun dna ;rerutcafunam
b) sliated fo tnempiuqe desu rof citsuoca -erusaem
11.3.2 Acoustic environment for tests
stnem gnidulcni ,eman ,epyt laires rebmun dna
;rerutcafunam
)a lanretni snoisnemid fo eht tset moor dna eht epyt
fo citsuoca dleif rof eht stnemerusaem .g.e( eerf
lc htdiwdnab fo ycneuqerf ;resylana
dleif revo a gnitcelfer ;)enalp
4 llarevo ycneuqerf esnopser fo noitatnemurtsni
eht lacitsuoca tnemtaert fo eht tset ;moor
metsys dna etad dna dohtem fo ;noitarbilac
eht etad fo ;tnemerusaem
)e dohtem fo noitarbilac fo senohporcim dna etad
dna ecalp fo .noitarbilac
tneibma ria erutarepmet ni( seerged ,)suisleC
evitaler ytidimuh ni( )egatnecrep dna cirtemorab
erusserp ni( ;)”slacsap 11.3.7 Motor operatlng conditions
edulcnI eht gniwollof sliated rof hcae :tset
4 stluser fo lacitsuoca noitacifilauq fo tset -norivne
stnem sa deriuqer yb esualc .5
4 lluf noitpircsed fo ,diulf gnidulcni noitacifissalc ni
ecnadrocca htiw 0SI ;4-3476
11.3.3 Reference sound source nehw( )elbacilppa
b) diulf ytisocsiv noitacifissalc ni ecnadrocca htiw
)a ,rerutcafunam epyt dna laires ;rebmun 0SI ,6443 ni sekotsitnec ro ni erauqs sertemillim

rep ;lsdnoces
)b dnuos rewop level noitarbilac ,atad gnidulcni

eman fo gnitarbilac yrotarobal dna etad fo -ilac 4 lfahs ,deeps ni snoitulover rep ;etunim
.noitarb
)d tuptuo ,euqrot ni notwen ;sertem
4.3.11 Mounting and installation conditions of
motor )e telni ,erusserp ni slacsapagem ;)’esrab(
)a noitpircsed fo rotom gnitnuom ;snoitidnoc 9 teltuo ,erusserp ni slacsapagem ;)srab(
)b erutan dna scitsiretcarahc fo eht ciluardyh tiucric )9 erutarepmet fo diulf ta rotom ,telni ni seerged
dna sliated fo yna citsuoca noitalusni :tnemtaert .suisleC
c) erutan dna noitpircsed fo rehto senihcam gnieb 11.3.6 Acoustical data
desu hcihw dluoc evah na ecneulfni no eht
derusaem dnuos erusserp slevel fo eht .rotom edulcnI lla atad sa deriuqer yb 0SI 4473
4) 1 aP = s--01 rab
)5 1 cSt = 1 sl*mm
)6 1 bar - 105 N/m’ - 105 Pa - 0,l MPa