Kev Ntsuam Xyuas Ntawm Cov Ntsiab Cai Ua Haujlwm ntawm Acoustic Absorption Vaj Huam Sib Luag Thiab Suab Zog Hloov Hloov Mechanisms

Hauv kev tsim kho thiab kev ua kom zoo ntawm qhov chaw nyob sab hauv thiab sab nraum zoov acoustic, acoustic absorption panels tau txais txiaj ntsig zoo ntawm lub suab nthwv dej los ntawm cov txheej txheem tshwj xeeb ntawm lub cev, yog li txhim kho cov yam ntxwv reverberation, txo cov suab nrov, thiab txhim kho kev mloog zoo. Kev nkag siab txog lawv cov hauv paus ntsiab lus ua haujlwm pab ntau txoj hauv kev xaiv cov ntaub ntawv thiab muab tso rau hauv engineering xyaum kom ua tiav cov txiaj ntsig acoustic xav tau.
Cov txheej txheem tseem ceeb ntawm lub suab nqus cov vaj huam sib luag nyob rau hauv kev hloov qhov xwm txheej suab lub zog rau hauv lwm hom ntawm lub zog thiab thaum kawg dissipating nws. Lub suab nthwv dej yog qhov tseem ceeb hloov pauv hauv huab cua siab. Thaum lawv nthuav tawm mus rau saum npoo ntawm cov khoom siv, lawv ua rau muaj kev vibrations thiab kev sib txhuam ntawm cov khoom siv sab hauv lossis qhov chaw microstructure. Raws li qhov sib txawv ntawm cov khoom siv thiab cov qauv, muaj peb yam tseem ceeb ntawm lub suab nqus cov ntsiab lus.
Thawj hom yog cov ntxeem tau lub suab nqus tshuab, feem ntau pom nyob rau hauv cov ntaub ntawv ntxeem tau xws li polyester fiber, iav ntaub plaub, thiab pob zeb wool. Cov ntaub ntawv no muaj ntau qhov sib cuam tshuam microporous channels. Thaum lub suab tsis nkag mus, lawv ua rau cov huab cua nyob rau hauv lub qhov hws kom vibrate, generating viscous resistance thiab tshav kub conduction poob ntawm cov huab cua thiab lub pore phab ntsa, maj converting suab zog rau hauv tshav kub zog thiab absorbing nws. Cov txheej txheem no tseem ceeb tshwj xeeb hauv nruab nrab - mus rau - ntau zaus, raws li luv luv wavelength suab tsis muaj feem yuav nkag mus tob rau hauv cov khoom thiab ua rau muaj kev sib txhuam ntawm lub zog tawg.
Hom thib ob yog lub suab nrov nrov absorbing mechanism, feem ntau sawv cev los ntawm perforated panels nrog kab noj hniav thiab nyias - phaj resonant suab absorbers. Cov huab cua txheej tom qab lub vaj huam sib luag perforated thiab cov perforations tsim Helmholtz resonator. Thaum lub suab yoj zaus mus txog qhov system lub ntuj resonant zaus, huab cua hauv kab noj hniav vibrates, siv zog los ntawm kev sib txhuam nrog cov phab ntsa perforation; nyias- phaj resonance siv lub inertial coupling ntawm lub phaj thiab cov huab cua txheej tom qab nws, ua ib tug resonant nqus ncov ntawm ib tug tsawg zaus. Hom qauv no tuaj yeem them nyiaj tshwj xeeb rau qhov tsis txaus ntawm cov khoom ntxeem tau qis hauv - zaus suab nqus, ua tiav kev tswj hwm kev sib npaug ntawm tag nrho cov zaus band.
Hom thib peb suav nrog impedance mismatch thiab cuam tshuam tawg. Qee lub suab nrov nrov siv cov duab tsis zoo los yog sib xyaw ua ke ntawm cov ntxeem tau thiab nruj los hloov txoj kev xav txog thiab theem kev sib raug zoo ntawm lub suab tsis, ua rau muaj kev cuam tshuam tsis zoo rau ib leeg los sis qee lub zog yuav rov ua dua rau lub suab -absorbing qauv, yog li indirectly txhim kho lub zuag qhia tag nrho suab absorption efficiency. Hauv kev siv tswv yim, ib qho kev siv tshuab feem ntau tsis txaus los npog tag nrho cov zaus ntau. Yog li ntawd, kev tsim qauv sib xyaw siv ntau yam khoom siv thiab cov qauv siv feem ntau ua haujlwm hauv engineering kom ua tiav broadband, siab -kev nqus suab. acoustic suab-absorbing vaj huam sib luag, los ntawm kev hloov pauv thiab dissipating suab lub zog, tsim kom pom tseeb thiab xis nyob hauv ntau qhov chaw, dhau los ua ib qho tseem ceeb ntawm cov khoom siv hauv kev tsim acoustic niaj hnub thiab tswj suab nrov.