Lub suab teeb meem txo cov suab nrov tsis yog los ntawm "thaiv" suab, tab sis los ntawm kev siv cov qauv zoo nkauj acoustic kom nqus, xav txog, thiab cuam tshuam lub suab tsis zoo. Tsab ntawv xov xwm no qhia txog qhov tob hauv - saib cov qauv sab hauv ntawm fiberglass sound barriers thiab cov hauv paus ntsiab lus ntawm kev txo suab nrov.
Standard Structure ntawm Fiberglass Sound Barriers
Tus qauv suab-absorbing thiab suab-insulating fiberglass barrier module yog feem ntau sib sau ua ke hauv "sandwich" configuration uas muaj cov nram qab no Cheebtsam, los ntawm pem hauv ntej mus rau sab nraum qab:
Pem Hauv Ntej (Lub Suab-fab sab): Perforated fiberglass vaj huam sib luag
Lub vaj huam sib luag nta ib txwm faib ntawm ntau micro-perforations (nrog rau qhov perforation feem ntau ntawm 20% thiab 30%). Nws lub luag haujlwm tseem ceeb yog tso cai rau lub suab tsis dhau mus rau hauv qhov thaiv sab hauv thaum tiv thaiv lub suab sab hauv- nqus cov khoom los ntawm cua thiab nag yaig.
Core Layer: Suab -absorbing khoom (acoustic wool)
Sab hauv yog ntim nrog cov khoom ntxeem tau, xoob xoob- xws li ultrafine iav ntaub plaub los yog pob zeb wool- nyob rau hauv ib daim nyias nyias.
Sab nraum qab (Raws sab): Cov khoom siv fiberglass suab-insulating vaj huam sib luag
This is a dense, non-porous fiberglass panel designed primarily to block the direct transmission of sound waves.
Peb Core Mechanisms ntawm Noise Reduction
Thaum lub suab tsis tsim los ntawm lub tsheb lossis cov tshuab ntaus lub suab nrov fiberglass, lawv raug txo qis los ntawm peb cov txheej txheem hauv qab no:
1. Suab Absorption Mechanism (Friction and Energy Conversion): Raws li suab nthwv dej dhau los ntawm perforated pem hauv ntej vaj huam sib luag thiab nkag mus rau hauv lub suab sab hauv-absorbing wool, lawv induce vibration hauv cov khoom me me fibers. Tsav los ntawm kev sib hloov siab ntawm lub suab nthwv dej, huab cua oscillates hauv micro- pores, tsim kev sib txhuam hnyav tawm tsam phab ntsa pore. Thaum lub sijhawm ua haujlwm no, lub zog suab hloov mus rau hauv tshav kub thiab dissipated, yog li txo cov suab nrov rov qab mus rau qhov chaw.
2. Lub suab rwb thaiv tsev tshuab (Txoj cai lij choj thiab thaiv): Cov suab tsis zoo uas tsis tau nqus tag nrho txuas ntxiv mus rau sab nraud, tawm tsam cov tuab fiberglass rov qab vaj huam sib luag. Due to the sufficient surface density and rigidity of the fiberglass-reinforced plastic (FRP) backing panel, sound waves cannot penetrate it, thereby creating an "acoustic shadow zone" behind the barrier (analogous to the shadow cast when light is obstructed by an object).
3. Tiv thaiv sab saum toj -ntug diffraction: Lub suab ncig zoo li nthwv dej, muaj tus yam ntxwv ntawm kev nthuav tawm mus tom ntej los ntawm kev khoov ib puag ncig cov teeb meem -ib qho tshwm sim hu ua "diffraction." Txhawm rau tiv thaiv lub suab los ntawm "txo" saum toj ntawm lub suab nrov, cov kev cuam tshuam FRP niaj hnub no feem ntau muaj cov qauv tsim xws li lub kaum sab xis, loj- vojvoog nkhaus, lossis rov qab L-puab (cap-style) saum. Cov duab geometric zoo no ua rau txoj hauv kev ntev uas lub suab tsis yuav tsum tau mus txog thaj tsam tom qab qhov thaiv, uas ua rau muaj kev cuam tshuam ntau dua ntawm lub suab nrov. Kev soj ntsuam kev ua tau zoo: Ob qhov kev ntsuas tseem ceeb feem ntau yog siv hauv kev lag luam los ntsuas FRP suab nrov teeb meem:
Qhov Ntsuas Qhov Ntsuas Qhov Ntsuas Qhov Ntsuas (Rw): Ntsuas lub vaj huam sib luag nraub qaum lub peev xwm "block" suab; Feem ntau yuav tsum muaj ntau dua lossis sib npaug rau 30 dB. Noise Reduction Coefficient (NRC): Ntsuas lub peev xwm sab hauv kom "sau" suab; siab- cov khoom zoo tuaj yeem ua tiav NRC ntau tshaj 0.8 (txhais tau tias lawv nqus tau ntau dua 80% ntawm cov teeb meem suab nrov).
