Sound Insulation Analysis of Automotive Soundproof Material using Urethane and Rubber

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1 Jornl o Technology nd Socil Science JTSS Sond Inlion Anlyi o Aomoive Sondproo Meril ing Urehne nd Rer Yohio row,, Tey Ozki,, oyki kizmi 3,c Fcly o Science nd Engineering, Teikyo Univeriy, - Toyoodi, Unomiy Ciy , Jpn Prker Corporion, 5 ine, Fky Ciy 369-4, Jpn 3 Prker Ahi Co., Ld., 5 ine, Fky Ciy 369-4, Jpn <ykrow@mp.eikyo-.c.p>, <ozki@prkercorp.co.p>, c <nkizmi-n@prker-hi.co.p> eyword: omoive, poro medi, coic, virion, rnmiion lo, Bio model, FEM Arc. Enhncemen i necery in he coic inlion perormnce wih repec o he high-reqency inerior noie o omoile. In hi dy, o improve he ond inlion in he overll coic inlion o rer hee lmined o rehne, we ed wle hpe on he rehne rce nd hen exmined he reling coic chnge. We perormed he e ing imple ond inlion perormnce meremen device nd compred i rel wih he virion ond nlyi rel oined ing inie elemen model. We ed he Bio model or he rehne ing individlly clcled prmeer. In ddiion, wih repec o he ond nd virion inp, we clcled he ond perormnce chnge reling rom dierence in he wle hpe ri widh, ri inervl. A rel, in cerin reqency nd, we conirmed h he ond inlion perormnce hd improved.. Inrodcion In ody omoile, more hn en kilogrm o ond-oring nd inlion meril re ypiclly ed in ech cr. Thee meril ply n imporn role in prevening noie rom enering he cr, inclding rod noie, engine ond pon ccelerion, nd wind noie dring high-peed operion. In hyrid nd elecric vehicle, new noie, ch moor noie, hve een inrodced, which will reqire rher enion o enre in-vehicle qiene nd comor. However, o lower he price o cr nd improve el economy, increing he nmer o ond-oring nd inlion meril i no necerily he e regy. Rher, we m improve ondprooing eec while redcing he weigh nd opimlly rrnging he ond inlion meril. In hi dy, we ed inie elemen model FEM o model ond-oring nd inlion meril nd, ing Bio heory nd he inie elemen mehod, we hen nlyzed he coic chrceriic o he ond-oring nd inlion meril o lmined rcre wih vrio hpe. Speciiclly, we died ond-inlion meril in which rer w lmined ono rehne, nd in which we chnged he rehne i convenionl l hpe o wle hpe wih ri reglr inervl Fig.. Wih repec o he ond inlion perormnce, we nlyzed he reling coic virion nd virion exciion J. Tech. Soc. Sci., Vol., o., 08

2 Jornl o Technology nd Socil Science JTSS J. Tech. Soc. Sci., Vol., o., 08 Fig.. Urehne om wle hpe o omoive ondproo meril. Anlyi model nd nlyi rel In hi dy, we perormed or clclion ing he Bio-Allrd model o hndle he rme o he poro ody nd he inernl ir. The Bio model i heoreicl orml or predicing he ir-propgion ond rnmied y inciden ond coming ino he meril nd ping hrogh he gp eween he poro elic odie in he meril nd he reling diplcemen o he olid inide he meril. We ed he diplcemen o he rme nd he diplcemen o he lid o conider he inercion eween he olid diplcemen nd he ir-propgion ond, which cn e expreed hown in Eqion nd :[][] : poroiy, : deniy o poro rme, : ir deniy, : eqivlen deniy o he lid wih repec o vico dmping in he inercion eween he poro rme nd he lid. i expreed hown in Eqion 3: 3 : olid lo cor, : low reiiviy, : oroiy, : chrceriic lengh o he vicoiy. The elic modl or A, B, nd C i hown in Eqion 4: G Q P G Q R 4 G G

3 Jornl o Technology nd Socil Science JTSS J. Tech. Soc. Sci., Vol., o., 08 R Q P : lk modl o he poro rme in vcm, : lk modl o he rme meril, nd : her modl o he poro rme in vcm. Eqion 5 or A nd Eqion 6 or B re ollow: E 3 5 / 0 6 ' ' 8 H H P 6 :peciic he rio, P0 :mopheric prere, :herml diiviy, :eqivlen lk modl o lid conidering herml enion in inercion eween poro rme nd lid, nd ' : chrceriic he lengh. 3. Model nd nlyi rel Wih repec o he lmined oring nd inling meril o he FEM, we nlyzed or coic inp model nd hree virion inp model. In hi ecion, we ir inrodce he coic nd virion model. Then, we decrie he phyicl properie o he rer, rehne, ir, nd iron ple nd he coic incidence nd virion inp condiion ed in or nlyi. 3. Sond inp model The ond-oring nd inlion meril we ed in he nlyi i lmine o rehne nd rer on n eel pnel e. We modeled wle hped ri wih widh o 60 [mm] Fig. nd 0 [mm] Fig.. We hen prepred one wih lyer wih ir Fig. 3 nd noher wih rile meril

4 Jornl o Technology nd Socil Science JTSS Fig. 4, which i ed in convenionl omoile. We ed he ollowing cominion o cking rrngemen: Ri widh 60 [mm] Fig. : rer hickne [mm] rehne wih one ide wle hped ri hickne [mm], inclding he whole ri 0 [mm] ir lyer hickne 5 [mm] in he gp o he ri eel pnel hickne 0.8 [mm] Ri widh 0 [mm] Fig. 3 : rer hickne [mm] rehne hped ri hickne 5 [mm], inclding ri whole 0 [mm] ir lyer hickne 5 [mm] in he gp o ri eel pnel hickne 0.8 [mm] Wih ir lyer Fig. 4 : rer hickne [mm] rehne hickne 5 [mm] ir hickne 5 [mm] eel pnel hickne 0.8 [mm] o ri Fig. 5: rer hickne [mm] rehne hickne 0 [mm] eel pnel hickne 0.8 [mm] rermm ri inervl : 00mm 480mm ri widh : 60mm rehne0mm ir5mm pnel0.8mm cro ecion ri widh : 60mm ck rce Fig.. FE model or Ri widh : 60 mm 480mm rer mm rehne ri widh : 0mm 0mm ir5mm pnel0.8mm Fig.3. Ri widh : 0mm rer mm rehne 5mm ir5mm Fig.4. Wih ir lyer pnel0.8mm rermm rehne 0mm Fig.5. on ri pnel0.8mm 3. Virion inp model The model or he virion inp re ollow: Ri widh 4 [mm] Fig. 6 : rom ove rer rom he op hickne.6 [mm] rehne wih wle hpe on one ide ri hickne [mm], inclding ri whole 0 [mm] ir lyer hickne [mm] eel pnel hickne 0.8 [mm] in he ri gp J. Tech. Soc. Sci., Vol., o., 08

5 Jornl o Technology nd Socil Science JTSS Wih ir lyer Fig. 7 : rom ove rer hickne.6 [mm] rehne hickne 8 [mm] ir lyer hickne [mm] eel pnel hickne 0.8 mm o ri Fig. 8 : rom ove rer hickne.6 [mm] rehne hickne 0 [mm] eel pnel hickne 0.8 [mm] rer.6mm ri inervl : 44mm 3mm ri widh : 4mm rehne 0mm irmm pnel0.8mm ri widh : 4mm cro ecion ck rce Fig. 6. FE model or Ri widh : 4 mm 3mm rer rehne8mm rehne0mm rer.6mm irmm Fig.7. Wih ir lyer pnel0.8mm Fig.8. on ri pnel0.8mm 3.3 Anlyi condiion We condced he coic incidence experimen ing he impliied ond inlion meremen device hown in Fig. 9. We perormed he virion inp experimen in n APAMAT eing mchine. The ond incidence nd virion inp condiion were ollow. We nlyzed ll model reqencie rom 00 [Hz] o 700 [Hz] nd compred he rel /3 ocve nd inervl. We nlyzed he e model nder he ollowing wo condiion. Sond incidence rndom incidence: We genered ond h rndomly enered he whole reqency rnge rom he lower rce o he eel pnel e nd hen nlyzed he ond emied rom he rer rce. Thereer, o oin he inerion lo, we rced he ond prere level o he eel ple rom he ond prere level o he whole model. The oervion poin in he model i 500 mm ove he cener o he lower rce o he eel pnel. Virion inp vericl inp: We clcled he ond prere level coming rom he rer rce when ecing he enire lower rce o he eel ple o vericl virion ll reqencie wih []. The oervion poin o hi model i lo 500 mm ove he cener o he lower rce o he eel pnel J. Tech. Soc. Sci., Vol., o., 08

6 Jornl o Technology nd Socil Science JTSS Mic mple Mic Poro medi medimedi 640mm 640mm 0mm pnel 50mm 50mm peker Fig. 9 Experimenl ep o ond inlion 3.4 Sond inp nlyi rel rndom incidence / ree ondry condiion Here, we provide he clclion rel inerion lo or he ond incidence. Figre 0 how he nlyi condiion. The grph o Fig. how he cl experimenl rel, which indice eer ond inlion perormnce he reqency incree. The clclion rel o he grph wih ri widh o 60 [mm] nd 0 [mm] re eween h or he preence o n ir lyer nd h wih no ri, nd imilr endencie re hown in he clcled nd experimenl rel. Bed on hee rel, we conider he clclion rel or oh ri widh 60 [mm] nd 0 [mm] o e vlid. The inerion lo or he hpe o rehne eween o 50 [Hz] nd 000 [Hz] w ove h or he meril wiho ri, which how h he ond inlion perormnce increed. However, hi rel diered grely rom he experimenl rel in he viciniy o 50 [Hz] nd 000 [Hz] o 000 [Hz]. The reon or hi my e he lck o ondry condiion, he c h he rehne nd eel pnel re conecive in or nlyi model, or dierence in he phyicl propery vle. In he clclion rel Fig. 0, he inerion lo in he reonnce reqency rnge o 50 [Hz] decreed, ri widh o 0 [mm], 60 [mm], nd no ri, he rer nd eel pnel virion vle re lrge. Since he rer nd eel pnel were in oppoie phe pproching nd epring, he rehne ced pring, o we elieve h he virion o he rer nd eel pnel ple w promoed. Thereore, ince he movemen o he rer gin he eel pnel increed, we conider he inerion lo o hve decreed. Wih ir lyer Ri widh 60mm Ri widh 0mm on ri on ri Ri widh 60mm Ri widh 0mm Fig. 0. Clclion rel o inerion lo Fig.. Experimen rel o inerion lo ree ondry condiion J. Tech. Soc. Sci., Vol., o., 08

7 Jornl o Technology nd Socil Science JTSS A he reqency ecome higher hn h o he reonnce reqency, he movemen o he rer grdlly decree, nd when he reqency reche 000 [Hz] or more, he rer hrdly move ll. Alo, he moion o he eel pnel ecome mll nd iner. 3.5 Sond inp nlyi rel rndom incidence / ixed ondry condiion To improve he ccrcy o or nlyi, we perormed or clclion ing he model ondry condiion complee conrin. Figre 0 how he nlyi rel when he conrin condiion i pplied o he periphery o he model. Figre how grph compring he experimenl rel or ri widh o 60 [mm], ri widh o 60 [mm] wiho conrin, nd ri widh o 60 [mm] wih rerin rer, rehne, eel pnel. We ond h when he rerin condiion rer, rehne, eel pnel i pplied, he rel pproched hoe o he experimen eer hn did hoe or no rerin. However, in he cl experimenl ppr, he periphery o he rer rce i preed y n eel pnel nd i no compleely rerined. A ch, i eem h o 50 [Hz] o 300 [Hz] nd o 000 [Hz] o 000 [Hz], dieren level were oined hn hoe in he experimen. Wih repec o he diplcemen diriion Fig. or ri widh o 60 [mm] wih ondry condiion reonnce reqency o o 300 [Hz], we oerved locl diplcemen h did no occr or he ri widh o 60 [mm] wiho he conrin condiion. Alhogh he locl diplcemen increed, he rer nd he eel pnel vired in oppoie phe overll, nd we conider h he inerion lo decreed de o he lrge mplide o he rer wih repec o he eel pnel. Experimen Anlyi ree Anlyi ix Fig.. Clclion rel o inerion lo ixed ondry condiion Fig. 3. Comprion o Clclion nd Experimen Ri widh : 60mm rer pnel Fig.4. Diplcemen o rer nd pnel or ri widh 60 mm J. Tech. Soc. Sci., Vol., o., 08

8 3.6 Anlyi rel virion inp Jornl o Technology nd Socil Science JTSS Figre 5 how he clclion rel ond prere level or he virion inp decried in A. The ri widh o 4 [mm] i hrdly improved ll ece o he drop in he ond prere level de o he reonnce reqency hi o reqency lower hn h wiho ri. However, we ond h ri widh o 4 [mm] in he middle reqency rnge rom rond he reonnce reqency o o 000 [Hz] incree he ond inlion perormnce more hn h wiho ri. The reonnce reqency o he ri widh o 4 [mm] w rond 0 [Hz], hi ime he diplcemen o he model wiho ri nd h wih ri widh o 4 [mm] ply he role o he rehne nd he eel pnel nd rer re in revered virion phe Fig. 6. We conider h he ond prere level decreed in he reonnce reqency rnge ece o he lrge mplide o he rer wih repec o he eel pnel. A he reqency pproche 6300 [Hz], he mplide o he rer decree. on ri Ri widh 4mm Air lyer Fig. 5. Clclion rel o ond prere rer 4. Smmry pnel Fig.6. Diplcemen o rer nd pnel or ri widh 4 mm In hi pper, we nlyzed he wo inerion lo condiion when ond w inp rom nder he eel pnel nd he ond prere when virion w pplied o he eel ple over he enire rce wih.0 []. We oined he ollowing rel: Boh he ond incidence nd virion inp improved he inerion lo nd ond prere level perormnce de o he wle hpe, excep low nd high reqencie. Wih repec o he coic inp, he clclion rel or ri widh o 0 mm nd 60 mm were eween hoe or no ri nd he preence o n ir lyer. We conider h i he wle hpe i chnged, he inerion lo lo chnge or he clclion rel o no ri nd he preence o n ir lyer. We ond h he clcled coic incidence pproche h o he experimenl rel when conrin condiion i pplied. However, ince he experimen i no perecly conrined, hi m e ken ino coniderion when conrcing model J. Tech. Soc. Sci., Vol., o., 08

9 Jornl o Technology nd Socil Science JTSS In re work, o rher improve nlyi ccrcy, we will exmine he rerin condiion o he ond-oring nd inlion meril. Alo, o improve he ond inlion perormnce, we will conider new hpe nd rcre. Reerence [] J. F. Alld, nd. Al, Propgion o ond in poro medi, A John Wiley & Son, Ld., 009. []. Ygiw, Y. row, nd A. ozw, "Sond inlion nlyi o poro medi ing rehne nd gm", Sociey o Dmping Technology in Jpn 06 Sympoim, SDT J. Tech. Soc. Sci., Vol., o., 08