Tam sim no nws yog ntau dua thiab ntau dua los siv hluav taws xobcov nplai tsheb thauj khoomTxog kev kho thiab kev saib xyuas dav dav ntawm cov khoom siv hluav taws xob / lub tshuab ntsuas qhov hnyav, cia peb tham txog cov ntaub ntawv hauv qab no ua tus neeg muab khoom siv ntsuas qhov hnyav:
Lub tshuab ntsuas hluav taws xob feem ntau yog tsim los ntawm peb ntu: lub loadcell, cov qauv thiab lub voj voog. Qhov tseeb yog txij li 1/1500 txog 1/10000 lossis tsawg dua. Kev siv ob chav integral A / D hloov pauv circuit tuaj yeem ua tau raws li qhov yuav tsum tau ua thiab muaj qhov zoo ntawm kev muaj peev xwm tiv thaiv kev cuam tshuam thiab tus nqi qis. Hauv kev siv cov cai ntsuas hauv tebchaws, qhov yuam kev ntawm lub tshuab ntsuas hluav taws xob nws tus kheej thiab qhov yuam kev ntxiv hauv kev siv yog cov teeb meem uas cov chaw tsim khoom thiab cov neeg siv yuav tsum tau them sai sai rau.
Ua ntej, txoj kev txo qhov yuam kev hauv kev tsim thiab kev tsim khoom ntawm lub tshuab hluav taws xob hnyav:
1. Kev lav phib xaub ntawm cov cim qhia kev ua haujlwm ntawm lub loadcell
Nws yog qhov tseem ceeb los xyuas kom meej qhov zoo ntawm cov khoom siv hluav taws xob kom xaiv cov loadcells nrog ntau yam ntsuas kev ua haujlwm uas ua tau raws li qhov yuav tsum tau ua. Linearity, creep, tsis muaj load kub coefficient thiab rhiab heev kub coefficient yog cov cim tseem ceeb ntawm cov loadcells. Rau txhua pawg ntawm cov loadcells, kev kuaj xyuas qauv thiab kev sim kub siab thiab qis yuav tsum tau ua raws li tus nqi kuaj uas xav tau los ntawm cov qauv hauv tebchaws.
2. Cov coefficient kub ntawm lub tsheb thauj khoom hluav taws xob
Kev tshuaj xyuas theoretical thiab kev sim ua pov thawj tias qhov kub coefficient ntawm qhov tsis kam ntawm lub amplifier input thiab qhov tsis kam tawm tswv yim yog cov yam tseem ceeb uas cuam tshuam rau qhov kub coefficient ntawm qhov rhiab heev ntawm lub tsheb thauj khoom hluav taws xob, thiab yuav tsum xaiv lub hlau zaj duab xis resistor nrog qhov kub coefficient ntawm 5 × 10-6. Kev sim kub siab yuav tsum tau ua rau txhua lub tsheb thauj khoom hluav taws xob tsim tawm. Rau qee cov khoom lag luam nrog me me ntawm qhov kub coefficient tawm ntawm kev kam rau siab, cov hlau zaj duab xis resistors nrog qhov kub coefficient ntawm tsawg dua 25 × 10-6 tuaj yeem siv los them rov qab. Tib lub sijhawm nrog kev sim kub siab, cov khoom lag luam tau raug rau qhov kub laus kom txhim kho kev ruaj khov ntawm cov khoom.
3. Kev them nyiaj tsis yog linear ntawm lub tshuab hluav taws xob tsheb thauj khoom
Nyob rau hauv qhov xwm txheej zoo tagnrho, qhov ntau ntawm cov khoom siv hluav taws xob tom qab hloov pauv analog-rau-digital thiab qhov hnyav uas muab rau ntawm cov khoom siv hluav taws xob yuav tsum yog linear. Thaum ua qhov tseeb calibration thaum lub sijhawm tsim khoom, siv cov kev pab cuam hauv computer sab hauv rau kev calibration ib-point. Xam qhov nqes hav ntawm tus lej thiab qhov hnyav raws li txoj kab ncaj nraim zoo tagnrho thiab khaws cia rau hauv lub cim xeeb. Qhov no tsis tuaj yeem kov yeej qhov yuam kev tsis yog linear uas tsim los ntawm lub sensor thiab integrator. Siv ntau-point kho, siv ntau txoj kab ncaj nraim los kwv yees ib qho nkhaus zoo txo qhov yuam kev tsis yog linear yam tsis nce tus nqi kho vajtse. Piv txwv li, lub khoom siv hluav taws xob nrog 1/3000 qhov tseeb siv 3-point calibration, thiab lub khoom siv hluav taws xob nrog 1/5000 qhov tseeb siv 5-point calibration.
Lub sijhawm tshaj tawm: Lub Kaum Hli-28-2021