Lub rotating ncej (los yog rotor) generates vibrations uas kis tau mus rau lubcais casetwj tso kua mis thiab tom qab ntawd mus rau ib puag ncig cov khoom siv, cov kav dej thiab cov chaw. Vibration amplitude feem ntau sib txawv nrog rotor / ncej rotational ceev. Ntawm qhov ceev ceev, qhov kev vibration amplitude yuav loj dua thiab cov ncej vibrates hauv resonance. Unbalance thiab misalignment yog ib qho tseem ceeb ua rau lub twj tso kua mis vibration. Txawm li cas los xij, muaj lwm qhov chaw thiab cov ntaub ntawv ntawm kev co cuam tshuam nrog cov twj.

Kev vibration, tshwj xeeb tshaj yog vim qhov tsis sib xws thiab qhov tsis zoo, tau ua rau muaj kev txhawj xeeb tas li rau kev ua haujlwm, kev ua haujlwm, kev ntseeg siab thiab kev nyab xeeb ntawm ntau lub twj tso kua mis. Qhov tseem ceeb yog ib txoj hauv kev zoo rau kev vibration, ntsuas, kev sib dhos thiab kev saib xyuas (kev co saib xyuas). Feem ntau kev tshawb fawb txogcais casetwj tso kua mis kev co, sib npaug, kev sib dhos thiab kev vibration mob xyuas yog theoretical.

Kev saib xyuas tshwj xeeb yuav tsum tau them rau qhov ua tau zoo ntawm daim ntawv thov ua haujlwm nrog rau cov txheej txheem yooj yim thiab cov cai (rau cov tswv lag luam, cov kws tsim khoom cog thiab cov kws tshaj lij). Kab lus no tham txog kev vibration hauv cov twj thiab cov intricacies thiab subtleties ntawm cov teeb meem koj yuav ntsib.

Vibrations hauv Pthawv

Split cas pua umpsyog dav siv nyob rau hauv niaj hnub factories thiab chaw. Nyob rau hauv xyoo tas los, muaj ib qho kev hloov mus rau qhov nrawm dua, cov twj muaj zog dua nrog kev ua haujlwm zoo dua thiab qis dua kev co. Txawm li cas los xij, kom ua tiav cov hom phiaj nyuaj no, nws yog ib qho tsim nyog yuav tsum tau hais kom zoo dua, ua haujlwm thiab tswj cov twj. Qhov no txhais tau tias zoo dua tsim, qauv, simulation, tsom xam, tsim khoom thiab tu.

Kev vibration ntau dhau tuaj yeem yog qhov teeb meem tshwm sim los yog qhia txog kev ua tsis tiav. Kev vibration thiab cuam tshuam kev poob siab / suab nrov yog pom los ntawm kev ua haujlwm nyuaj, teeb meem kev ntseeg tau, kev tawg, tsis xis nyob thiab kev txhawj xeeb txog kev nyab xeeb.

Vibting Pkos duab

Cov yam ntxwv tseem ceeb ntawm rotor vibration feem ntau yog sib tham raws li cov qauv thiab cov qauv yooj yim. Nyob rau hauv txoj kev no, kev co ntawm lub rotor tuaj yeem muab faib ua ob ntu hauv txoj kev xav: kev vibration dawb thiab yuam kev vibration.

Kev vibration muaj ob yam tseem ceeb, zoo thiab tsis zoo. Nyob rau hauv ib tug pem hauv ntej tivthaiv, lub rotor rotates raws ib tug helical txoj kev nyob ib ncig ntawm lub bearing axis nyob rau hauv cov kev taw qhia ntawm ncej tig. Conversely, nyob rau hauv tsis zoo vibration, lub rotor center spirals nyob ib ncig ntawm lub bearing axis nyob rau hauv lub opposite kev taw qhia mus rau lub ncej tig. Yog tias lub twj tso kua mis tau tsim thiab ua haujlwm tau zoo, cov kev vibrations dawb feem ntau lwj sai sai, ua rau kev quab yuam quab yuam yog qhov teeb meem loj.

Muaj cov kev sib tw sib txawv thiab cov teeb meem hauv kev soj ntsuam kev co, kev soj ntsuam kev co thiab nws txoj kev nkag siab. Feem ntau, raws li qhov kev vibration zaus nce, nws yuav nyuaj rau kev xam / txheeb xyuas qhov kev sib raug zoo ntawm kev co thiab kev sim / kev nyeem tiag tiag vim yog cov qauv ntawm cov qauv nyuaj.

Lub twj tso kua mis thiab Resonance

Rau ntau hom twj, xws li cov uas muaj peev xwm sib txawv ntawm qhov ceev, nws yog qhov tsis zoo rau kev tsim thiab tsim lub twj tso kua mis nrog cov npoo tsim nyog nyob rau hauv resonance ntawm tag nrho cov muaj peev xwm perturbations (excitations) thiab txhua yam ua tau ntuj tsim ntawm kev co..

Resonant tej yam kev mob feem ntau tsis muaj kev zam, xws li hloov pauv ceev lub cev muaj zog tsav (VSD) los yog qhov sib txawv ntawm qhov ceev ntawm chav turbines, roj turbines thiab cav. Nyob rau hauv kev xyaum, lub twj tso kua mis yuav tsum tau dimensioned raws li tus account rau resonance. Qee qhov xwm txheej resonance tsis yog qhov txaus ntshai vim yog, piv txwv li, kev cuam tshuam siab cuam tshuam rau hauv cov qauv.

Rau lwm qhov xwm txheej, yuav tsum tsim cov txheej txheem txo kom tsim nyog. Ib txoj hauv kev txo qis yog los ntawm kev txo cov excitation loads ua rau cov hom kev vibration. Piv txwv li, lub zog excitation vim qhov tsis sib npaug thiab qhov hnyav ntawm qhov sib txawv tuaj yeem txo qis los ntawm kev ntsuas kom zoo. Cov excitation rog feem ntau yuav raug txo los ntawm 70% mus rau 80% los ntawm qib qub / qub.

Rau qhov excitation tiag tiag nyob rau hauv lub twj tso kua mis (resonance tiag), cov kev taw qhia ntawm excitation yuav tsum phim lub ntuj hom zoo li hais tias lub ntuj hom yuav zoo siab los ntawm no excitation load (los yog ua). Feem ntau, yog tias cov kev taw qhia excitation tsis phim lub ntuj hom, muaj peev xwm ntawm coexistence nrog resonance. Piv txwv li, bending excitations feem ntau tsis tuaj yeem zoo siab ntawm lub ntuj zaus ntawm torsion. Nyob rau hauv tsawg zaus, ua ke nrog torsional transverse resonances yuav tshwm sim. Qhov tshwm sim ntawm cov xwm txheej tshwj xeeb lossis tsis tshua muaj tshwm sim yuav tsum tau soj ntsuam kom tsim nyog.

Qhov phem tshaj plaws rau resonance yog qhov coincidence ntawm lub ntuj thiab zoo siab hom duab ntawm tib zaus. Nyob rau hauv tej yam kev mob, ib co kev ua raws cai yog txaus rau excitation kom excite lub hom duab.

Tsis tas li ntawd, cov xwm txheej nyuaj coupling tej zaum yuav muaj nyob qhov twg ib qho excitation tshwj xeeb yuav excite yam tsis zoo li hom los ntawm kev sib txuas ntawm kev vibrational mechanisms. Los ntawm kev sib piv cov excitation hom thiab natural hom duab, ib tug impression yuav tsim txawm excitation ntawm ib tug tej zaus los yog harmonic txiav txim yog txaus ntshai / txaus ntshai rau lub twj tso kua mis. Kev paub txog kev ua tau zoo, kev sim kom raug, thiab kev siv cov ntawv txheeb xyuas yog txoj hauv kev los ntsuas kev pheej hmoo hauv cov teeb meem theoretical resonance.

Txaj Muag

Kev tsis ncaj ncees yog qhov tseem ceeb ntawmcais casetwj vibration. Kev txwv qhov tseeb ntawm cov ncej thiab cov couplings feem ntau yog qhov nyuaj. Muaj feem ntau me me offsets ntawm rotor center kab (radial offset) thiab kev sib txuas nrog angular offsets, piv txwv li vim tsis-perpendicular mating flanges. Yog li yuav muaj qee qhov kev vibration vim misalignment.

Thaum lub coupling halves raug yuam bolted ua ke, qhov kev sib hloov ntawm ncej tsim ib khub ntawm kev sib hloov zog vim radial offset thiab ib khub ntawm rotational dabtsi yog khoov lub sij hawm vim misalignment. Rau misalignment, qhov kev sib hloov quab yuam no yuav tshwm sim ob zaug ib lub kiv puag ncig / rotor kiv puag ncig thiab cov yam ntxwv kev vibration excitation tshaj tawm yog ob zaug ntawm ncej tshaj tawm.

Rau ntau lub twj tso kua mis, kev khiav hauj lwm ceev thiab/los yog nws cov harmonics cuam tshuam nrog ceev ceev (natural zaus). Yog li, lub hom phiaj yog kom tsis txhob muaj kev phom sij txaus ntshai, teeb meem thiab ua haujlwm tsis zoo. Kev ntsuam xyuas kev pheej hmoo cuam tshuam yog nyob ntawm qhov tsim nyog simulation thiab kev ua haujlwm dhau los.