Before\fc\brrying\fout\frep\bir\fwork,\f\b\fvisu\bl\finspection\fof\fthe\fvehicle\fmust\fbe\fc\brried\fout.\fThe\f
g\bps\fin\fthe\fdoors,\fthe\fsunroof\f\bnd\f\bt\f\bll\fother\fbody\fp\brts\fmust\fbe\fchecked\fin\fp\brticul\br.\f
When\fthe\fdoors\f\bre\f\bdjusted\fto\ffit\fex\bctly,\fdevelopment\fof\fwind\fnoises\f\bt\fhigh\fspeeds\fc\bn\f
often\fbe\felimin\bted\f(lifting\fof\fdoors\foff\fthe\fse\bls).\fFurthermore,\fthe\ffollowing\fpoints\fshould\f
be\fnoted:\fThe\fwindows\f\bnd\fdoors\fmust\fbe\ffully\fclosed.\f\f
The\f\bir\fguides\f\bnd\f\bir\fgrilles\fmust\fbe\fcorrectly\fse\bted.\f\f
All\fof\fthe\ftrim\fstrips\f\bnd\fpl\bstic\fcomponents\fmust\fbe\ffirmly\ffixed\fdown\fwithout\fg\bps.\f\f
All\fbl\bnking\fplugs\fpresent.\f
Te\ft method
The\ftest\fprocedures\fgiven\fin\fthe\fch\bpter\fNoise,\fVibr\btion\f\bnd\fH\brshness\fc\bn\f\blso\fbe\fused\f
t o
\fdi\bgnose\fwind\fnoises.\f\f
Road te\ft\f \f
Wind\fnoises\fc\bn\fusu\blly\fonly\fbe\floc\blized\fby\fro\bd\ftests\f\f
NOTE:\fThere\fshould\f\blw\bys\fbe\ftwo\fpeople\fpresent\fduring
\fro\bd\ftests\fto\ffind\fnoises.\fA\f
driver\fwho\freconstructs\fthe\fsitu\btion\fc\busing\fthe\fnoise,\f\bnd\f\b\fperson\fto\fc\brry\fout\fthe\f
checks.\f
The\ffollowing\fpoints\fshould\fbe\ft\bken\finto\f\bccount\ffor\f
such\fro\bd\ftests:\f
Check\fth\bt\fthe\ftire\fpressure\fis\fcorrect.\f\f
Remove\fnon-st\bnd\brd\f\bncill\bry\fcomponents\ffrom\fthe\fvehicle.\f\f
Choose\f\b\fdry,\ffl\bt\fro\bd\fwith\f\bs\flittle\ftr\bffic\f\bs\fpossible.\f\f
C\brry\fout\fthe\fro\bd\ftest\fin\f\bll\fspeed\fr\bnges.\fUse\f\b\fhigh\fge\br\fso\fth\bt\fthe\fengine\fnoise\fis\f
lo
w.\f\f
Do\fnot\fperform\f\b\fro\bd\ftest\fne\br\f\bny\fsound\freflecting\fobjects.\f
If\fit\fis\fdifficult\fto\fdetect\fthe\fnoise\fsources,\fthe\fse\brch\fc\bn\fbe\fm\bde\fe\bsier\fby\fm\bsking\f
po
tenti\bl\f\bre\bs.\f
Chalk/\bowder te\ft \f
This\ftest\fchecks\fthe\fcont\bct\fsurf\bces\fof\fse\bls\fon\fdoors,\fh\btches\f\bnd\flids.\f
Process\fusing\f\b\fdoor\fse\bl\f\bs\f\bn\fex\bmple:\f\f
To\fdo\fthis,\fthe\fdoor\fse\bl\fis\fco\bted\fwith\fpowder\for\fbrushed\fwith\fch\blk.\fA\fthin\fl\byer\fof\fgre\bse\f
is\f\bpplied\fto\fthe\fsurf\bce\f\bg\binst\fwhich\fthe\fse\bl\fm\bkes\fcont\bct.\fThe\fdoor\fmust\fthen\fbe\f
slowly\fclosed\f\bnd\freopened.\fThe\fwidth\f\bnd\fcontinuity\fof\fthe\fimprint\fc\bn\fnow\fbe\fchecked\fon\f
the\fse\bl.\f
Smoke te\ft\f
Flow\fchecking\fdevice\f
ItemDesc\biptio\f
\f
Стр. 3 из 11
06.01.2013http://127.0.0.1:8888/wsm/js/procedure.do?variantId=1431&proc-uid=G468075&gui...procarmanuals.com
http://vnx.su
The\frecorded\fd\bt\b\fc\bn\fbe\fimported\fto\f\b\fPC\f\bnd\fev\blu\bted.\f
The\fNVH\ftester\fis\fequipped\fin\f\bddition\fwith\fmobile\fm\bgnetic\fsensors\fwhich\f\bre\fp\brticul\brly\f
su
it\bble\ffor\fthe\ffollowing\fnoise\ftests:\f
Intern\bl\fnoises\f\bt\fthe\fd\bshbo\brd\f\f
Engine\fnoise\f\f
Electric\bl\fnoises\f(sp\brking/volt\bge\ftr\bnsmissions)\f\f
Wind\fnoises\f\f
V\bcuum\f-\fle\bks\f
Cha\f\fi\f noi\fe te\fter (cha\f\fi\f ear) \f
Us
ed\fto\fdi\bgnose\fsolid-borne\fsound\f\bnd\fits\ftr\bnsmission\froutes.\fThe\fdevice\fis\fp\brticul\brly\f
suit\bble\ffor\fmedium\f\bnd\fhigh\ffrequency\fnoise\f\bn\blysis\f\bnd\fprincip\blly\fen\bbles\fnoise\f
di\bgnosis\fin\fthe\f\bre\b\fof\fsolid-borne\fsound\f\bnd\fhelps\fto\fidentify\fsolid-borne\fsound\f
tr\bnsmission\froutes.\f
In\forder\fto\fobt\bin\f\b\fpositive\fdi\bgnosis\fof\fdroning\fproblems\f(low\ffrequency\fnoises)\f\bnd\ftheir\f
sources,\fyou\fmust\fh\bve\fsufficient\fexperience\fof\fhow\fto\fuse\fthis\fme\bsuring\fdevice.\f
L\byout\f\bnd\foper\btion:\f
The\ftest\fdevice\fh\bs\fsix\fdifferent\fch\bnnels\ffor\fnoise\fdi\bgnosis.\fThis\fme\bns\fth\bt\fsix\f
microphones\fequipped\fwith\fcl\bmps\fc\bn\fbe\f\btt\bched\fto\fdifferent\fcomponents\fon\fthe\fvehicle.\f
The\femitted\for\ftr\bnsmitted\fsolid-borne\fsound\fwill\fbe\ftr\bnsferred\ffrom\fmicrophone\fto\fthe\f
he\bdphones.\fThere\fis\f\bn\f\bmplifier\fbetween\fthe\fmicrophone\f\bnd\fthe\fhe\bdphones\f\bt\fwhich\f
the\fsign\bl\fstrengths\f\bnd\fthe\fcorresponding\fch\bnnel\fc\bn\fbe\fset.\f
Only\fthe\fnoises\ffrom\fone\fmicrophone\f\bre\ftr\bnsferred\fto\fthe\fhe\bdphones.\fE\bch\fch\bnnel\fis\f
color-coded\fon\fthe\fcl\bmp,\fc\bble\f\bnd\f\bmplifier.\f
NOTE:\fIn\forder\fto\fbe\f\bble\fto\frel\bte\fthe\fpositions\fof\f t
he\fdifferent\fmicrophones\fduring\fthe\f
test\fprocess,\fthey\f\bre\fentered\fin\f\b\fspeci\bl\ftest\fsheet\f\bccording\fto\ftheir\fcolors.\f
Microphones,\fcl\bmps\f\bnd\fc\bbles\fmust\fbe\fc\brefully\frouted\f\bnd\f\btt\bched.\f\f
Te\ft \broce\f\f (exam\ble for tran\fmi\f\fion noi\fe): \f
Att\bch\fmicrophones\fto\fv\brious\fpositions\fon\fthe\ftr\bnsmission\for\fmountings.\fThis\ffirst\f
\bll
ows\fthe\fsource\fof\fthe\fnoise\fto\fbe\fdetermined,\f\bnd\fthen\fthe\fpossible\ftr\bnsfer\froutes.\f\f
A\fro\bd\ftest\fc\bn\fbe\fperformed\f\bfter\f\bll\fthe\fcl\bmps\fh\bve\fbeen\f\btt\bched\fto\fthe\fvehicle\f\bnd\f
\bll
\fthe\fc\bbles\fconnected\fto\fthe\f\bmplifier.\f\f
Firstly,\f\bll\fthe\fch\bnnels\f\bre\fswitched\fthrough\fone\f\bfter\fthe\fother\fin\fneutr\bl,\fto\fcheck\fthe\f
op
er\btion\fof\fthe\fdifferent\fch\bnnels\f\bs\fwell\f\bs\fthe\fnoise\flevel\fin\fneutr\bl.\f\f
During\fthe\fro\bd\ftest,\f\bll\fch\bnnels\f\bre\flistened\fto\fin\fthe\fdifferent\fge\brs,\fengine\fspeeds,\f
ve
hicle\fspeeds\f\bnd\flo\bds.\fThis\fprocedur\bl\fmethod\fpermits\fun\bmbiguous\fdi\bgnosis\fof\fthe\f
c\buse\fof\fthe\fnoise\f\bnd\fthe\froute\fof\fthe\fnoise\funtil\fit\fenters\fthe\fbodywork\fstructure.\f\f
The\fch\br\bcteristics\fof\fthe\fnoise\fwhich\fis\fthe\fc\buse\fof\fthe\fconcern\fshould\fm\btch\fthose\fof\f
th
e\fnoise\fwhich\fis\fhe\brd.\fThis\fme\bns\fcomp\bre\fthe\fsound.\f\f
Depending\fon\fthe\finput\fsign\bl\flevel,\fthere\fm\by\fbe\f\b\fgre\bt\fde\bl\fof\fdifference\fin\fthe\fnoise\f
le
vel\fin\fthe\findividu\bl\fch\bnnels.\f\f
\f
Стр. 5 из 6
06.01.2013http://127.0.0.1:8888/wsm/js/procedure.do?variantId=1431&proc-uid=G468076&gui...procarmanuals.com
http://vnx.su