Txhua -Aluminium Perforated Acoustic Vaj Huam Sib Luag

A: Txhua yam -aluminium perforated acoustic vaj huam sib luag yog lub suab-absorbing vaj huam sib luag ua los ntawm txhuas ntawv perforated nrog precisely engineered qhov (feem ntau Φ0.8-3.0mm txoj kab uas hla, 1-30% qhib cheeb tsam) uas yog backed nrog acoustic fleece, mineral wool, los yog ib tug muaj zog cav tov rau Helmholtz reservoir. Lub ntsej muag vaj huam sib luag yog txhuas (0.8-2.0mm tuab), cov tub ntxhais feem ntau yog aluminium honeycomb rau cov qauv rigidity, thiab cov tawv nqaij tom qab yog txhuas (khoom los yog micro-perforated). Thaum lub suab nthwv dej tawm tsam qhov chaw perforated, huab cua hauv txhua qhov ua raws li lub suab nrov thiab cov cua kab noj hniav tom qab ua raws li lub caij nplooj ntoos hlav acoustic, tsim kom muaj Helmholtz resonator array uas hloov suab lub zog mus rau hauv tshav kub los ntawm kev sib txhuam hauv qhov me me. Los ntawm kev kho lub qhov taub, qhov feem pua perforation, vaj huam sib luag thickness, thiab kab noj hniav qhov tob, lub siab nqus tau tuaj yeem raug tso rau lub hom phiaj tshwj xeeb suab nrov zaus - qis- zaus rumble (125–250 Hz), hais lus -ntau nrov nrov (500–2000 Hz), los yog siab tshaj 100 Hz (2000-4000 Hz). Txhua yam - txhuas perforated acoustic vaj huam sib luag yog siv nyob rau hauv architectural acoustics, muaj suab nrov tswj, tsheb thauj mus los, thiab HVAC daim ntawv thov qhov twg hluav taws kev nyab xeeb, durability, huv si, thiab acoustic kev ua tau zoo yuav tsum nyob ua ke.

A: Common specifications:
Lub ntsej muag daim tawv nqaij: 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm aluminium ntawv (3003-H14 los yog 5052-H32)
· Hole diameter: Φ0.8mm, Φ1.0mm, Φ1.5mm, Φ2.0mm, Φ2.5mm, Φ3.0mm, Φ5.0mm (micro-perforation: ≤1.0mm; macro-perforation: >1.0 hli)
· Qhov qauv: staggered (60℃suab, feem ntau - qhib qhov siab tshaj plaws rau qhov muab qhov loj), ncaj (90℃suab), los yog kev cai
· Perforation qhib cheeb tsam: 1-5% (micro-perforation, tuning- tsom), 10-23% (tus qauv acoustic), 25-40% (siab-pob tshab, pom kev pom tseeb)
· Lub qhov pitch (center-rau-center): feem ntau 2–5 × lub qhov taub
* Vaj huam sib luag thickness: 10mm, 12mm, 15mm, 20mm, 25mm, 30mm, 40mm, 50mm
· Rov qab daim tawv nqaij: khoom txhuas (rau Helmholtz resonator), micro-perforated aluminium (rau ob- txheej resonator - broadband absorption), los yog qhib (fleece-tsuas yog)
· Honeycomb core: 3003-H18, 6.4mm los yog 8.0mm cell (feem ntau tsuas yog nyob rau ntawm lub vaj huam sib luag ntug los yog tag nrho stiffener - acoustic kab noj hniav feem ntau yog huab cua- puv, tsis yog honeycomb-filled)
· Acoustic thaub qab:
- Dub acoustic fleece (tsis yog -polyester, 0.2–0.5mm tuab, NRC txhim kho + pom qhov muag dub tom qab qhov)
- Mineral wool / iav wool infill (25–50mm tuab, 30–80 kg/m³ - ntxiv broadband absorption)
- Cua kab noj hniav (qhov tob tom qab lub vaj huam sib luag txiav txim siab Helmholtz resonance zaus)
· Standard vaj huam sib luag qhov ntau thiab tsawg:
- Qab nthab panels: 600 × 600mm, 600 × 1200mm, 300 × 1200mm, 300 × 1800mm
- Phab ntsa panels: 600 × 1200mm, 600 × 2400mm, 1200 × 2400mm, qhov ntau thiab tsawg
· NRC (Noise Reduction Coefficient): 0.45–0.95 nyob ntawm kev teeb tsa
· Cov chav kawm suab nrov (ISO 11654): Chav Kawm C (NRC 0.40–0.55) rau Chav Kawm A (NRC 0.90–1.00)

A: Tus MOQ feem ntau yog 100-300 square metres rau cov qauv qhov taub, lub suab, thiab qhib - thaj chaw ua ke. Rau kev cai perforation qauv, qhov txawv qhov ntau thiab tsawg, los yog cov kev cai acoustic tuning, MOQ feem ntau yog 200-500 m². Acoustic qauv panels (600 × 600mm) thiab acoustic test reports for standard configurations are available. Thov muab koj lub hom phiaj suab nrov ntau zaus, xav tau NRC, vaj huam sib luag loj txwv, thiab hluav taws kub ntsuas qhov xav tau rau kev pom zoo tsim acoustic thiab hais lus.

A: Common applications:
· Auditoriums thiab concert halls: phab ntsa thiab qab nthab acoustic kho - txhuas vaj huam sib luag ua ke acoustic kev ua tau zoo nrog elegant architectural tsos thiab hluav taws kev nyab xeeb ua raws
· Cov chav rooj sab laj thiab cov rooj sib tham: hais lus- kev txawj ntse optimized panels - perforation tuned kom nqus lub suab zaus (250–2000 Hz), txo reverberation thiab ncha
· Qhib- phiaj xwm chaw ua haujlwm: qab nthab acoustic huab thiab phab ntsa absorbers - tswj lub suab nrov reverberant rau cov neeg nyob hauv kev nplij siab thiab kev tsim khoom
· Metro, railway, thiab chaw nres tsheb npav: loj- hom phab ntsa thiab qab nthab vaj huam sib luag - Chav Kawm A hluav taws- ntsuas, cuam tshuam- tiv taus, huv si, acoustic - tib lub vaj huam sib luag tau ntsib tag nrho plaub qhov kev xav tau ib txhij rau cov chaw thauj khoom
· Txoj kev thiab kev tsheb ciav hlau tsis muaj suab nrov: sab nrauv acoustic vaj huam sib luag raws txoj kev loj thiab cov kab tsheb ciav hlau - PVDF-coated aluminium nrog acoustic fleece, huab cua-resistant, NRC 0.70–0.90
· Muaj cov nroj tsuag thiab Hoobkas tswj suab nrov: tshuab enclosure panels, acoustic cov ntxaij vab tshaus, qab nthab baffles - ruaj, washable, roj- resistant nto nyob rau hauv lub suab nrov manufacturing puag ncig
· Cav kuaj hlwb thiab dynamometer chav: siab-kub acoustic vaj huam sib luag - tag nrho-aluminium siv tiv taus cua sov thiab siab- tshaj tawm airflow
· HVAC duct silencers thiab plenum liners: perforated aluminium tig rau lub suab -attenuating duct liners - xoom fiber ntau yaig rau hauv cov huab cua (tsis zoo li cov pob zeb hauv av)
· Gymnasiums thiab sports halls: impact-resistant acoustic wall panels - withstands ball impacts thiab khoom knocks
· Cov pas dej da dej thiab cov natatoriums: 100% waterproof acoustic qab nthab thiab phab ntsa vaj huam sib luag - tsuas yog acoustic vaj huam sib luag uas muaj sia nyob ib puag ncig lub pas dej (chlorine, 100% av noo, condensation)
· Cov chaw kaw suab thiab cov chaw tshaj tawm: precision -tuned acoustic panels nrog broadband absorption
· Cov chav huv huv thiab chaw kuaj mob: tsis yog-tso, tshuaj lom neeg- cov acoustic resistant - tus qauv ntxhia ntaub plaub acoustic vaj huam sib luag raug txwv hauv chav huv; aluminium yog txais

A: ① Chav Kawm A hluav taws- ntsuas qhov ua tau zoo ntawm acoustic: ntxhia wool thiab fiberglass acoustic panels cia siab rau cov binders combustible (phenolic resin) los tuav cov fiber ntau ua ke. Hauv qhov hluav taws kub, lawv tuaj yeem ua rau muaj roj ntau thiab cov pa luam yeeb. Tag nrho -aluminium perforated acoustic panels yog 100% tsis yog-combustible - tsuas yog acoustic vaj huam sib luag ua tiav Class A qhov hluav taws kub yam tsis muaj kev cuam tshuam lub suab nqus. Qhov no yog qhov yuav tsum tau ua rau pej xeem cov tsev, kev thauj mus los, thiab kev tsim kho siab - nce siab.
② Waterproof thiab av noo- pov thawj: acoustic fleece tom qab perforations tuaj yeem ntub thiab qhuav yam tsis muaj degradation (tsis zoo li cov ntaub plaub ntxhia, uas tawg thiab poob acoustic kev ua haujlwm thaum ntub). Lub vaj huam sib luag tuaj yeem ntsia tau rau hauv pas dej da dej, chav dej, sab nraum zoov canopies, thiab tropical climates - ib puag ncig uas cov khoom siv acoustic tsis zoo.
③ Tsis muaj fiber ntau shedding - cleanroom tshaj: ntxhia wool thiab fiberglass acoustic panels tsis tu ncua tso cov microscopic fibers rau saum huab cua dhau lawv lub neej kev pab cuam - tsis tuaj yeem lees txais hauv chav huv, tsev kho mob, kev ua zaub mov, thiab kev tsim hluav taws xob. Aluminium perforated panels nrog acoustic fleece muaj xoom fiber ntau tso rau hauv qhov chaw nyob.
④ Washable thiab sterilizable: aluminium nto tuaj yeem ntxuav, txhuam, thiab tshuaj tua kab mob. Qhov no yog qhov tseem ceeb rau tsev kho mob ua haujlwm ua yeeb yam, chav ua noj ua haus, thiab chaw muag tshuaj uas muaj kev nyiam huv yog qhov tseem ceeb. Cov ntaub ntawv acoustic ntxeem tau (ua npuas ncauj, ntaub, ntaub plaub tsiaj) tsis tuaj yeem ntub dej - ntxuav.
⑤ Impact-tiv taus thiab ruaj khov: 0.8-2.0mm txhuas lub ntsej muag tiv thaiv kev cuam tshuam los ntawm cov pob (chaw ua si), lub nra (cov chaw thauj mus los), thiab cov khoom siv (cov nroj tsuag kev lag luam). Npuag- qhwv thiab ua npuas ncauj acoustic panels tau yooj yim torn, punctured, thiab dented.
⑥ Cov suab nrov meej: tsis zoo li broadband ntxeem tau absorbers (mineral wool, ua npuas ncauj) uas nqus tag nrho cov frequencies kuj uniformly, Helmholtz resonator perforated panels yuav tsum tau tuned rau tej zaus. Ib tus kws tshaj lij tuaj yeem tsom mus rau 125 Hz machinery hum lossis 2000 Hz hais lus -nrawm nrog kev phais kom raug los ntawm kev kho lub qhov loj, qhib qhov chaw, thiab kab noj hniav qhov tob.
⑦ Kev sib xyaw ua kom zoo nkauj: perforated aluminium panels yog kev tsim vaj tsev, tsis yog kev kho acoustic xwb. Lub qhov qauv dhau los ua tus qauv tsim - micro-perforation tsim ib qho kev ntxhib los mos matte; macro-perforation tsim kom pom cov qauv zoo nkauj. Cov xim, ntoo-cov nplej, thiab cov anodized tiav ua ke nrog cov ntsiab lus ntawm kev tsim vaj tsev.
⑧ Kev sib xyaw ua haujlwm: tib lub vaj huam sib luag tuaj yeem ua ke acoustics + kev ntsuas hluav taws kub + dej tsis sib haum + cuam tshuam + kev huv. Tsis tas yuav txheej cais cov ntaub ntawv nrog cov khoom tsis sib haum. Simplifies specification, kev yuav khoom, thiab installation.
⑨ Cov kev xaiv tshuaj tua kab mob: tiv thaiv - cov kab mob hmoov txheej los yog anodizing ntawm lub ntsej muag perforated - tseem ceeb rau kev noj qab haus huv thiab zaub mov ib puag ncig uas tswj kev huv ntawm qhov chaw.
⑩ Lub neej ua haujlwm ntev - xoom degradation: acoustic fleece tom qab cov perforations tsis degrade, khom, lossis poob kev ua haujlwm dhau sijhawm (tsis zoo li cov ntaub plaub, uas tuaj yeem poob rau hauv cov kab noj hniav). Lub vaj huam sib luag aluminium nws tus kheej muaj lub neej tsis muaj kev txwv. Acoustic kev ua tau zoo yog ruaj khov rau 30+ xyoo.

A: Acoustic configurations - li cas suab nqus tau tiav:
① Perforated lub ntsej muag + acoustic fleece + cua kab noj hniav (tus qauv): feem ntau configuration. Suab dhau los ntawm lub qhov, los ntawm lub fleece (siab- zaus absorber), thiab mus rau hauv cov pa kab noj hniav (tsawg-frequency resonator). Fleece tiv thaiv cov plua plav thiab cov khib nyiab kom nkag mus rau hauv kab noj hniav. NRC 0.55–0.85.
② Perforated lub ntsej muag + ntxhia wool infill + khoom rov qab: ntxhia wool sau cov kab noj hniav tom qab lub ntsej muag perforated, muab broadband nqus. NRC siab dua (0.75–0.95) tab sis muab kev huv huv (cov ntaub so ntswg tau muab zais tab sis tam sim no). Siv nyob rau hauv kev lag luam thiab kev thauj mus los daim ntawv thov qhov siab tshaj plaws nqus tau.
③ Micro-perforated lub ntsej muag + cua kab noj hniav + khoom rov qab (ntshiab Helmholtz resonator): tsis muaj fleece, tsis muaj ntxhia wool - lub suab nqus los ntawm micro-perforations. Lub vaj huam sib luag yog 100% hlau thiab tuaj yeem ntxuav aggressively. NRC 0.45–0.75. Qhov kawg cleanable acoustic vaj huam sib luag rau zaub mov / chaw muag tshuaj / kho mob.
④ Ob chav- txheej micro-perforated (ML-MPP): ob lub micro-perforated aluminium ntawv sib cais los ntawm huab cua sib txawv - broadband nqus los ntawm ib qho 100% hlau vaj huam sib luag. Advanced acoustic engineering rau qhov xav tau siab tshaj plaws.
⑤ Perforated lub ntsej muag + acoustic fleece + honeycomb core (sandwich vaj huam sib luag): honeycomb core cells txhua tus ua raws li tus neeg Helmholtz resonators - broadband absorption nyob rau hauv ib tug nyias, nruj structural vaj huam sib luag. NRC 0.60–0.85. Qhov zoo tshaj plaws rau kev siv architectural qhov twg lub vaj huam sib luag yog structural.
Perforation qauv - pom + acoustic tsim:
· Round qhov (tus qauv): staggered 60℃suab - qhov siab tshaj plaws qhib, zoo nkauj tshaj
· Square qhov: niaj hnub linear grid aesthetic
· Slotted: linear slots (2-5mm dav, 50-100mm ntev) - kev taw qhia pom kev txaus siab
· Micro-perforation: Φ0.8–1.0mm, very small pitch (2–3mm) - the holes are nearly invisible from >2m nrug, tsim kom muaj ib tug du matte nto
· Kawm tiav / gradient qauv: qhov loj me los yog qhov sib txawv ntawm lub vaj huam sib luag - tsim qhov pom kev txav thiab acoustic zoning
· Kev cai duab / logo perforation: CNC-drilled qhov tsim ib tug paub cov duab, ntawv nyeem, los yog logo - branding raws li acoustics
· Ua ke perforated + khoom thaj chaw: perimeter khoom ciam teb nrog perforated central teb - rau qab nthab vaj huam sib luag ntug nthuav dav
· Perforation nrog backlighting: LED strips qab lub perforated vaj huam sib luag tsim ib tug glowing acoustic qab nthab - ua heev architectural nyhuv

A: Yog, qhov tseeb. Tag nrho -aluminium perforated acoustic panels yog 100% tsis yog-combustible (GB 8624 Class A, EN 13501-1 A1). Lub ntsej muag aluminium, aluminium core (yog tias tam sim no), thiab aluminium rov qab daim tawv nqaij yog tag nrho cov hlau tsis-combustible.
Cov acoustic fleece (yog tias siv) feem ntau yog cov khoom siv tsis yog -polyester lossis iav fiber ntau - nyob rau hauv cov txheej nyias siv (0.2-0.5mm, kwv yees li 50-150 g / m²), nws txoj kev txhawb nqa hluav taws xob tsis zoo. Rau cov ntawv thov uas yuav tsum tau muaj kev nyab xeeb siab tshaj plaws hluav taws (tunnels, underground chaw nres tsheb, aircraft), cov ntshiab micro-perforated configuration (tsis muaj fleece, tsis muaj ntxhia wool) yog teev - 100% hlau, xoom combustible cov ntsiab lus.
Cov ntawv pov thawj hluav taws:
· GB 8624 Chav A
TS EN 13501-1 A1
BS 476 Chav Kawm 0
ASTM E84 Chav Kawm A
· FAR 25.853 (a) - aircraft interiors
· IMO FTP Code Part 1 & 5 - marine
Cov ntawv ceeb toom hluav taws kub muaj nyob rau cov qauv kev teeb tsa. Rau cov hluav taws uas muaj ntawv pov thawj- ntsuas qab nthab thiab phab ntsa sib txuas nrog cov acoustic vaj huam sib luag, qhov system- cov ntaub ntawv ntsuas qib tau muab.

A: · Cov qauv perforation txheem (ib puag ncig qhov, qauv suab), cov qauv vaj huam sib luag: 15-20 hnub ua haujlwm
· Kev cai perforation qauv los yog qhov ntau thiab tsawg: 20-30 hnub ua hauj lwm (suav nrog perforation tuag teeb los yog CNC programming)
· Micro-perforation los yog kawm tiav qauv: 25-35 hnub ua hauj lwm
· Cov kev txiav txim loj loj (5,000+ panels): cov khoom xa tawm, teem caij lees paub rooj plaub-los ntawm- rooj plaub
Perforation yog ua los ntawm CNC turret punch lossis CNC drilling / routing. Kev ceev ntau lawm nyob ntawm qhov suav ntawm ib lub vaj huam sib luag. Lub vaj huam sib luag 600 × 600mm nrog 2.5mm qhov ntawm 23% qhib thaj chaw muaj kwv yees li 15,000-20,000 qhov rau ib lub vaj huam sib luag.
Peb pom zoo kom koom nrog peb cov kws tsim hluav taws xob acoustic 6-8 lub lis piam ua ntej cov vaj huam sib luag yuav tsum tau nyob ntawm qhov chaw kom tso cai rau lub sijhawm rau kev tsim qauv acoustic, cov qauv vaj huam sib luag tsim nrog kev ntsuas suab nrov (impedance raj lossis reverberation chamber), thiab cov khoom kawg.

A: Ntim: Txhua lub ntsej muag vaj huam sib luag muaj kev tiv thaiv nrog lub Hoobkas- siv PE tiv thaiv zaj duab xis (tseem ceeb - zaj duab xis tiv thaiv plua plav los ntawm kev nkag mus rau hauv perforations thaum thauj thiab teeb tsa). Cov vaj huam sib luag yog sib cais los ntawm cov npuas npuas interlayers thiab ntim rau hauv hnyav -cov dej num corrugated cartons (10–20 panels ib thawv). Corner tiv thaiv yog siv. Cov thawv yog palletized, ncab- qhwv, thiab hlua. Rau kev xa tawm, cov pallets raug kaw hauv plywood crates.
Daim ntawv tshwj xeeb acoustic: Tsis txhob muab cov vaj huam sib luag ntsej muag - mus rau - ntsej muag ncaj qha yam tsis muaj kev sib cais - cov perforations ntawm ib lub vaj huam sib luag tuaj yeem imprint rau saum npoo ntawm lub vaj huam sib luag nyob rau hauv siab. Siv ua npuas ncauj interlayers txhua lub sijhawm.
Shipping:
· Domestic: mob siab rau huab cua- caij logistics, qhov rooj- mus rau - qhov rooj
· International: FCL hiav txwv freight. FOB / CIF nqe lus.
Cia rau ntawm qhov chaw: khaws cia hauv qhov chaw huv, qhuav. Khaws PE zaj duab xis kom txog thaum tom qab kev teeb tsa thiab kev tsim kho. Cov qhov perforation tuaj yeem cuab kev tsim kho plua plav - tshem tawm cov yeeb yaj kiab thaum ntxov yeej lub hom phiaj.

A: Kev teeb tsa - ua raws li cov txheej txheem kev teeb tsa tib yam li tus qauv tag nrho -aluminium qab nthab lossis phab ntsa vaj huam sib luag, nrog rau acoustic ntxiv - cov kev xav tshwj xeeb:
① Acoustic fleece tuav: dub acoustic fleece yog Hoobkas- siv rau sab nraum qab ntawm lub ntsej muag perforated. Tsis txhob tshem tawm, ntswj, lossis compress cov ntaub plaub - nws yog qhov tseem ceeb rau kev ua haujlwm acoustic thiab pom kev tsaus muag (tsis muaj nws, kab noj hniav tom qab pom los ntawm lub qhov).
② Cavity qhov tob: huab cua qhov tob hauv qab ntawm lub vaj huam sib luag yog qhov tseem ceeb rau qis - zaus nqus. Acoustic khw kos duab qhia qhov tseeb kab noj hniav qhov tob. Xyuas kom lub substructure tswj qhov tob no tsis tu ncua - variation ntawm ± 10mm cuam tshuam rau Helmholtz resonance zaus.
③ Huab cua- nruj ib puag ncig: rau Helmholtz resonator panels (tshwj xeeb yog micro-perforated), kab noj hniav tom qab lub vaj huam sib luag yuav tsum yog huab cua- nruj li sai tau rau qhov siab tshaj plaws tsawg- zaus nqus. Foob vaj huam sib luag-rau- vaj huam sib luag pob qij txha thiab ib puag ncig cov npoo nrog acoustic sealant lossis butyl daim kab xev. Leakage txo qis - zaus ua haujlwm.
④ Mineral wool installation (yog tias teev): nruab cov ntaub plaub los yog iav ntaub plaub nyob rau hauv kab noj hniav tom qab lub vaj huam sib luag ua ntej lub vaj huam sib luag mounted. Ua kom tiav qhov kev pab cuam, tsis muaj qhov sib txawv ntawm cov batts. Ruaj ntseg nrog mechanical fixings los yog impaling pins los tiv thaiv slumping.
⑤ Kev teeb tsa vaj huam sib luag rau kev sib txuas: tib txoj hauv kev uas tsis yog- acoustic vaj huam sib luag - nteg-hauv (T- kab sib chaws), clip-hauv, nuv-on, Z- clips, thiab lwm yam. Xyuas kom cov vaj huam sib luag tau zaum thiab sib dhos. Qhov sib txawv ntawm cov vaj huam sib luag uas nyob ib sab degrade acoustic kev ua tau zoo thiab tsim kom pom lub teeb pom kev los ntawm cov kab noj dub tom qab.
⑥ Edge trim thiab perimeter kaw: nruab perimeter trim profiles tom qab tag nrho cov panels nyob rau hauv qhov chaw. Lub trim npog cov kab noj hniav ntug ntug thiab muab ib tug tiav pom ciam teb.
⑦ Tom qab- kev tshuaj ntsuam xyuas: kos:
- Tag nrho cov vaj huam sib luag yog flush thiab theem
- Cov pob qij txha yog nruj thiab kaw (yog hais tias acoustic sealing yog teev)
- PE tiv thaiv zaj duab xis tseem nyob (tshem tawm tsuas yog tom qab txhua qhov kev tsim kho tiav)
- Tsis muaj qhov khoob, tsis muaj vaj huam sib luag, lossis cov vaj huam sib luag tsis zoo
⑧ Kev tshem tawm zaj duab xis: tshem PE tiv thaiv zaj duab xis los ntawm txhua lub vaj huam sib luag tsuas yog tom qab kev tsim kho tiav thiab qhov chaw tau ua tiav lawm - ntxuav. Tshem cov zaj duab xis maj mam ntawm lub kaum sab xis 180℃kom tsis txhob rub cov npoo ntawm lub vaj huam sib luag. Tshawb xyuas txhua qhov kev tsim kho plua plav hauv qhov perforations - nqus tsev yog tias xav tau (tsis txhob siv cov cua compressed, uas ua rau cov plua plav mus rau hauv lub fleece).
Peb muab acoustic installation phau ntawv, kab noj hniav nthuav dav kos duab, thiab ntawm -qhov chaw acoustic commissioning txhawb rau cov haujlwm tseem ceeb.