Lub Noise Fingerprint - Yuav Ua Li Cas Lub Chaw Ua Haujlwm Nres Nres Nres Tshawb Xyuas thiab tshem tawm Squeal Frequencies
Nres squeal tsis yog random. Txhua qhov squeal muaj qhov zaus tshwj xeeb-feem ntau ntawm 1,000 thiab 15,000 Hz- uas sib haum mus rau hom resonance ntawm lub nres nres. Lub ncoo, rotor, caliper, thiab bracket txhua tus muaj qhov ntau zaus. Thaum cov kev sib cuam tshuam ntawm cov khoom no ua rau muaj kev cuam tshuam, squeal tshwm sim. Lub chaw ua haujlwm nres nres ua haujlwm kho txhua qhov squeal zaus raws li "tus ntiv tes" uas taw qhia rau lub hauv paus tshwj xeeb. Los ntawm kev txheeb xyuas cov zaus no, lub Hoobkas tuaj yeem tsim cov ntaub qhwv uas tsis txhob muaj kev ntxhov siab ntawm cov zaus tseem ceeb- tshem tawm cov suab nrov yam tsis muaj kev sim-thiab-kev ua yuam kev. Kev nkag siab txog cov txheej txheem kuaj mob no pab cov neeg yuav khoom txaus siab rau kev tsim vaj tsev tom qab tiag tiag nres nres nres.
Yuav Ua Li Cas Squeal Frequencies Form
Nres squeal yog ib qho kev vibration rau tus kheej. Kev sib txhuam ntawm lub ncoo thiab rotor tsis ua kom khov kho-state zawv zawg; nws tsim cov nplaum-slip oscillations. Yog hais tias qhov zaus ntawm cov oscillations phim lub ntuj zaus ntawm txhua yam nres, resonance amplifies lub vibration rau hauv audible suab.
Qhov ntau zaus thiab lawv cov laj thawj yog:
· Tsawg zaus (1,000–2,500 Hz) – Feem ntau txuas rau caliper lossis bracket dabtsi yog khoov hom. Nws tuaj yeem tshwm sim los ntawm kev tshem tawm ntau dhau, tsis txaus caliper nruj, lossis tsis zoo abutment clip tsim.
· Nruab nrab zaus (2,500–6,000 Hz) – Feem ntau txuam nrog pad dabtsi yog khoov lossis shear hom. Qhov qauv, chamfer tsim, thiab shim stiffness yog cov tseem ceeb influencers.
· High zaus (6,000–15,000 Hz) - Feem ntau tshwm sim los ntawm kev sib txhuam ntawm qhov chaw tsis ruaj khov- cov rotor nto, tsis sib xws ntawm cov yeeb yaj kiab, lossis cov khoom siv tawv tawv uas tsim cov micro-vibrations.
Yuav ua li cas lub Hoobkas tsim "Ntsuab ntiv tes"
Lub Hoobkas tshaj lij siv NVH dynamometer nruab nrog lub microphones thiab accelerometers los ntes lub ncoo lub suab nrov kos npe. Cov txheej txheem xeem muaj xws li:
· Braking ntawm ntau yam pressures (5-50 bar), kub (ambient rau 400 degree), thiab ceev.
· Sau cov zaus spectra thaum txhua daim ntawv thov nres.
· Plotting zaus piv rau amplitude los tsim "suab nrov dej tsaws tsag"- daim ntawv qhia 3D uas qhia tias zaus twg txaus siab rau qhov twg.
Qhov tshwm sim yog ib tus ntiv tes tshwj xeeb rau txhua qhov sib xyaw ua ke ntawm pad-rotor-caliper. Ib lub ncoo ntsiag to qhia ob peb, qis-amplitude peaks. Lub ncoo nrov nrov qhia qhov txawv, siab-amplitude spikes ntawm cov zaus tshwj xeeb.
Kev kuaj mob thiab tshem tawm suab nrov
Thaum tus ntiv tes tau tsim, lub Hoobkas siv cov phiaj xwm tiv thaiv:
· Tsawg zaus squeal (caliper / bracket hom) - Kho lub shim lub thickness los yog txheej muaj pes tsawg leeg los hloov tus yam ntxwv damping. Lub thicker shim los yog ib txheej roj hmab ntxiv hloov lub resonance deb ntawm excitation zaus.
· Mid-frequency squeal (pad hom) - Hloov lub kaum sab xis chamfer los yog qhov qauv. Hloov lub ncoo qhov ntev los yog khov kho hloov nws lub ntuj zaus. Lub Hoobkas tuaj yeem sim peb lossis plaub qhov qauv kom pom qhov ntsiag to.
· High-frequency squeal (surface instabilities) - Kho cov khoom sib tsoo los yog sib tsoo tiav. Ib me ntsis coarser nto los yog hloov cov ntsiab lus abrasive hloov cov kev sib txhuam dynamics, tshem tawm high-frequency excitation.
Daim ntawv thov tiag-World
Ib lub Hoobkas hauv Zhejiang xeev tau taug qab tsis tu ncua 4,200 Hz squeal ntawm ib lub SUV nrov rau lub ncoo txoj kev khoov hom. Los ntawm kev ncua lub qhov tob ntawm 0.5 hli thiab ntxiv cov roj hmab thib ob rau lub shim, lub Hoobkas tau hloov lub ntuj zaus mus rau 5,100 Hz- sab nraum qhov excitation ntau - tshem tawm cov squeal nkaus. Qhov kev hloov kho raug nqi tsawg dua $ 0.05 ib txheej hauv cov khoom siv ntxiv.
Cov neeg yuav khoom yuav tsum nug dab tsi
Thaum ntsuam xyuas lub Hoobkas nres nres, nug:
· Koj puas ua qhov ntsuas zaus ntawm koj lub NVH dynamometer?
· Koj puas tuaj yeem muab daim ntawv qhia suab nrov rau cov lej uas kuv xav xaj?
· Koj siv cov ntaub ntawv zaus li cas los txhim kho chamfer, qhov, thiab shim tsim?
· Koj qhov squeal tshwm sim npaum li cas (feem pua ntawm cov ntaub ntawv kuaj xyuas ua suab nrov tshaj 70 dB)?
Factories nrog loj NVH engineering yuav qhia spectra thiab tsim rationales. Cov uas tsis tuaj yeem piav qhia qhov ntau zaus tom qab lawv qhov kev sim suab nrov tuaj yeem ua rau kev kawm kwv yees.
Kev Sib Tham Cov Neeg Siv Khoom
Raws li ib tug distributor, koj tuaj yeem piav qhia: "Peb cov ntaub qhwv tau raug tsim los ntawm kev soj ntsuam zaus kom ntseeg tau tias lawv tsis muaj suab nrov ntawm squeal-prone frequencies. Yog vim li cas lawv nyob ntsiag to - tsis yog hmoov zoo, tab sis los ntawm kev tsim."
Kab hauv qab
Nres suab tsis yog qhov txawv txav. Nws yog ib qho kev kwv yees resonance uas tuaj yeem kuaj tau los ntawm kev ntsuas zaus. Lub chaw tsim khoom siv lub tshuab nres tsheb siv cov ntaub ntawv no txhawm rau txhawm rau tshem tawm squeal -los ntawm kev ua kom zoo dua qub, hloov chamfer, qhov hloov kho, thiab kho qhov chaw. Thaum koj los ntawm lub Hoobkas uas nkag siab cov ntiv tes nrov nrov, koj xa cov ntaub qhwv uas nyob ntsiag to hauv lub ntiaj teb tiag tiag-thiab cawm koj cov neeg siv khoom los ntawm kev txaj muag thiab kev ntxhov siab ntawm kev sib tsoo.
