Yog tias koj tau siv txhua lub sijhawm nyob ib puag ncig cov chaw ntsuas roj- lossis txawm tias tsuas yog flipped los ntawm cov ntawv teev npe kev tshaj lij- tej zaum koj yuav poob rau lub sijhawm "Multipath ultrasonic flow meter” Suab zoo heev. Thiab ncaj ncees, nws zoo li.
Tab sis ntawm no yog qhov: lub tswv yim yooj yim tsis yog qhov nyuaj thaum koj tshem tawm cov lus.
Lub tswv yim tseem ceeb (tsis muaj phau ntawv qhia tsis zoo)
Multipath ultrasonic flow meter ntsuas roj tshaj tawm los ntawm kev tua cov cim ultrasonic hla cov yeeb nkab los ntawm ntau txoj hauv kev-los yog "channels," raws li engineers nyiam hu rau lawv. Txhua channel muab kev nyeem nrawm rau koj ntawm qhov sib txawv chord ntawm cov yeeb nkab hla -section. Koj nruab nrab cov kev nyeem ntawv ua ke, hnyav kom tsim nyog, thiab boom: koj tau txais kev kwv yees zoo npaum li cas cov pa roj tau txav mus los ntawm cov yeeb nkab ntawd.
Ib leeg -channel meters kuj muaj. Lawv pheej yig dua. Lawv yooj yim dua. Tab sis lawv tseem tab tom saib tsuas yog ib daim ntawm cov ntws profile, uas tuaj yeem nkag siab yog tias qhov ntws tsis zoo ib yam. Thiab cia kuv qhia koj - ntws yuav luag tsis zoo ib yam.
Ob leeg ib leeg thiab multipath versions cia siab rau ib yam dab tsi hu ua lub sijhawm - ntawm - txoj kev ya davhlau. Nws ua haujlwm zoo li no: koj muaj ob lub transducers nyob rau sab nraud ntawm cov yeeb nkab. Ib tug xa ib tug ultrasonic pulse downstream (nrog rau ntws), lwm tus xa ib tug upstream (tawm tsam qhov ntws). Lub downstream mem tes tuaj sai dua vim nws caij cov roj tam sim no. Tus dej ntws yuav siv sij hawm ntev dua vim nws tawm tsam nws.
Koj ntsuas ob lub sijhawm mus ncig, suav qhov sib txawv, thiab los ntawm qhov sib txawv ntawd koj tuaj yeem muab qhov nrawm. Kev lej tsis yog qhov tsis tseem ceeb, tab sis nws tau zoo - tsim. Tib neeg tau ua qhov no tau ntau xyoo lawm.
Vim Li Cas Ntau Channel?
Nov yog qhov uas nws tau nthuav tawm - thiab qhov twg kuv muaj qee qhov kev xav.
Hauv multipath meter, V sawv cev rau qhov nruab nrab qhov nrawm ntsuas ntawm txhua qhov channel. Koj nyob nraum qhov tseem ceeb sampling qhov tshaj tawm profile ntawm qhov siab sib txawv ntawm cov kab yeeb nkab. Cov mis zoo li no: qhov nruab nrab qhov nruab nrab ntawm qhov sib npaug sib npaug ntawm txhua qhov channel qhov nrawm sib npaug los ntawm nws qhov hnyav coefficient. Sau tawm: v=ΣwᵢVᵢ, qhov twg W yog qhov hnyav coefficient uas nyob ntawm seb qhov kev sib koom ua ke algorithm qhov chaw tsim khoom txiav txim siab siv.
Los ntawm qhov ntawd, koj tuaj yeem suav tus nqi txaus: q=A × Σ(WᵢVᵢ), qhov twg A yog cov yeeb nkab hla - ntu ntu.
Kev sib koom ua ke sib txawv muab qhov hnyav sib txawv rau cov chord sib txawv. Gaussian quadrature yog nrov. Yog li yog txoj kev Chebyshev. Txhua tus muaj kev lag luam tawm - tawm. Tab sis ncaj ncees, tshwj tsis yog tias koj tab tom ua tus tsim engineering koj tus kheej, tej zaum koj yuav tsis tas txhawj txog qhov twg yog "zoo tshaj plaws." Lawv txhua tus ua haujlwm zoo.
Rau -Channel Question
Tam sim no, cov khoom siv siab tshaj plaws -kawg los ntawm cov tuam txhab txawv teb chaws khiav mus txog rau 6 channel. Koj xav tias ntau cov channel sib npaug ntau qhov raug. Thiab txoj kev xav, yog-cov ntsiab lus piv txwv ntxiv yuav tsum muab koj qhov kwv yees zoo dua ntawm qhov tseeb tshaj tawm qhov profile.
Tab sis kev xyaum ua tau qhia ib zaj dab neeg sib txawv.
Thaum koj ntaus plaub channel, qhov tseeb tau txais los ntawm kev ntxiv ntau txoj hauv kev ua marginal. Lub caij no, cov nqi tsim khoom nce. Txhua tus khub transducer ntxiv xav tau kev sib raug zoo. Txhua tus ntxiv cov ntsiab lus tsis ua tiav. Txhua tus complexes installation thiab tu.
Yog li puas yog rau -channel meter muaj nqis tshaj plaub-channel? Qee zaum. Rau kev saib xyuas hloov daim ntawv thov qhov twg feem ntawm ib feem ntawm qhov teeb meem, tej zaum. Rau feem ntau cov ntawv thov kev lag luam? Tej zaum tsis yog.
Kev teeb tsa tseem ceeb tshaj qhov koj xav
Kuv tau pom zoo nkauj rau -txoj kev ntsuas ntsuas nyob rau hauv qhov chaw txaus ntshai- tam sim ntawd nqes dej ntawm lub luj tshib, nrog lub voj voog ntws thiab asymmetric nrawm nrawm uas ua rau txhua qhov txuas ntxiv yuav luag tsis muaj txiaj ntsig. Lub 'meter' tau ntsuas cov khib nyiab, thiab qhov nruab nrab cov khib nyiab rau txoj kev sib txawv tsuas yog muab rau koj ... zoo-cov khib nyiab nruab nrab.
Cov kev taw qhia dav dav hais tias koj xav tau yam tsawg kawg yog yim txoj kab uas hla ntawm txoj kab ncaj nraim mus rau sab saud thiab ob txoj kab nruab nrab ntawm cov dej ntws los ntawm kev cuam tshuam. Tab sis qhov ntawd yog ib qho kev qhia, tsis yog qhov lav. Cyclonic flow patterns, pitch flow, temperature stratification-tag nrho cov no tuaj yeem cuam tshuam nrog koj cov kev nyeem hauv txoj hauv kev uas ntau cov channel tsis tuaj yeem them rov qab tag nrho.
Qee qhov kev teeb tsa 'meter' siv hla txoj hauv kev (X- qauv kev npaj) txhawm rau tshem tawm qee qhov kev cuam tshuam. Txawj ntse, tab sis tsis khawv koob.
Tiag -Kev xav hauv ntiaj teb
Reynolds tus naj npawb yuav tsum siab dua 4000 rau cov dej ntws tsis sib haum- feem ntau tsis muaj teeb meem hauv cov kav dej muaj roj. Laminar ntws tsis tshua muaj. Qhov ceev ntawm lub suab nyob rau hauv cov pa cuam tshuam lub teeb liab lub sij hawm mus txawv tebchaws, tab sis niaj hnub meters lis no cia li los ntawm kub them nyiaj.
Transducers feem ntau mount ntawm lub kaum sab xis ntawm 45 degrees lossis ntau tshaj qhov txheeb ze rau qhov kev taw qhia ntws, txawm tias lub kaum sab xis zoo nyob ntawm cov yeeb nkab txoj kab uas hla, roj tshaj tawm, thiab kub. Qhov siab tshaj plaws ua haujlwm kub feem ntau yog nyob ib ncig ntawm 650℃F rau kev teeb tsa tus qauv. Cryogenic daim ntaub ntawv yog tag nrho cov tsiaj nyaum sib txawv.
Kab hauv qab
Multipath ultrasonic flowmeter yog cov cuab yeej zoo. Lawv tsis yog -intrusive, tsis muaj qhov txav mus los, tswj tau ntau yam ntawm cov nqi ntws, thiab tuaj yeem ua tiav qhov tseeb zoo thaum nruab thiab ntsuas.
Tab sis lawv tsis yog ruam. Ntau txoj hauv kev tsis tau txhais tau tias tau txais txiaj ntsig zoo dua. Ib qhov dej- nruab plaub-channel ntsuas hauv cov dej ntws zoo yuav ua tau zoo tshaj rau -channel meter ntsia rau hauv qhov chaw teeb meem txhua zaus.
Kev nkag siab txog cov hauv paus ntsiab lus - sij hawm- ntawm - kev ntsuas dav hlau, kev sib xyaw nrawm, lub luag haujlwm ntawm qhov hnyav coefficients - pab koj txiav txim siab zoo dua txog thaum twg cov ntsuas no ua rau kev nkag siab thiab yuav ua li cas kom tau txais txiaj ntsig zoo tshaj plaws ntawm lawv.
