Kev daws teeb meem ntawm thermocouple nonlinearity: Yuav ua li cas ntsuas qhov kub thiab txias kom raug?

Yuav ua li cas kom tau yooj yim ua tau siab -Precision Temperature Measurement thiab tshem tawm Thermocouple Nonlinearity?

Thermocouples, raws li ib qho ntawm cov khoom siv dav tshaj plaws hauv kev ntsuas kub ntsuas, tau txais kev pom zoo los ntawm cov kws ua haujlwm rau lawv qhov kub thiab txias, muaj zog, thiab cov lus teb ceev ceev. Txawm li cas los xij, qhov nonlinearity ntawm thermocouple tso zis voltage thiab kub ib txwm yog ib qho teeb meem tseem ceeb cuam tshuam kev ntsuas qhov tseeb.

Niaj hnub no, peb yuav tshawb nrhiav yuav ua li cas los txhim kho cov txheej txheem nrhiav cov lus thiab kev kho algorithmic los ntawm kev siv tswv yim pom zoo kom txo tau qhov kev nyuaj siab thaum txhim kho kev ntsuas qhov tseeb.

Kev Sib Tw ntawm Thermocouple Nonlinearity

Kev sib raug zoo ntawm thermocouple tso zis voltage thiab kub tsis yog ib qho yooj yim linear. Piv txwv li, hom K thermocouple muaj qhov rhiab heev ntawm 39 μV /℃ntawm 0 degree, tab sis qhov no dhau los ua 47 μV /℃ntawm 100 degree.

Qhov no nonlinearity ua ncaj qha xam qhov kub thiab txias los ntawm voltage nyeem complex, thiab ib txwm linear ua txoj kev qhia tseem ceeb yuam kev, tshwj xeeb tshaj yog nyob rau hauv high kub. Piv txwv li, hom K thermocouple haum nrog qhov thib tsib - xaj polynomial muaj qhov yuam kev tsawg dua 0.1℃hauv qab 200 degree, tab sis qhov yuam kev nce mus rau 1.2℃ntawm 800℃.

Optimizing the Lookup Table Method: A Smart Upgrade of Traditional Solutions

Txoj kev nrhiav lub rooj yog ib qho ntawm cov kev kho tsis ncaj tshaj plaws. Nws hloov pauv qhov ntsuas hluav taws xob mus rau qhov ntsuas kub sib xws los ntawm kev khaws cov ntaub ntawv thermocouple calibration rooj. Cov rooj saib niaj hnub yuav tsum khaws cov ntaub ntawv ntau. Piv txwv li, ib qho kev sim aero- lub cav siv cov txheej txheem nrhiav cov lus xav tau los khaws 100,000 cov ntaub ntawv, ua rau FPGA cov peev txheej muaj peev xwm ncav cuag 75%.

Cov tswv yim optimization muaj xws li:

Segmented lookup table nrog linear interpolation: Faib qhov kub thiab txias rau hauv ob peb ntu thiab ua cov linear interpolation xam nyob rau hauv txhua ntu. Qhov no ua kom muaj tseeb thaum txo qis cov ntaub ntawv xav tau rau kev khaws cia.

Dynamic segmentation lub tswv yim: Siv cov ntu sib txawv raws li qhov℃ntawm nonlinearity nyob rau hauv qhov kub thiab txias. Cov ntu denser yog siv nyob rau hauv cov cheeb tsam uas tsis muaj kab mob hnyav, thaum sparser ntu yog siv nyob rau hauv cov cheeb tsam uas tsis muaj qhov tsis sib xws, txhim kho kev siv peev txheej.

Ua ke compression algorithms: Compressing thiab khaws cia cov ntaub ntawv calibration cov ntaub ntawv, xav tau tiag tiag - lub sij hawm decompression thaum siv, yog li txo qhov chaw cia khoom.

Kev kho algorithm: Kev ntsuas ntse hloov kho hardware nyuaj

Kev kho algorithm ua tiav cov nyiaj them tsis raug los ntawm kev suav lej, txo qis kev cia siab ntawm cov khoom siv kho vajtse.

1. Polynomial Fitting Algorithm

Cov algorithm no siv cov lej sib npaug ntawm cov lej los kwv yees cov yam ntxwv tsis zoo ntawm cov thermocouples. Piv txwv li, qhov thib peb -kev txiav txim polynomial tej zaum yuav yog: V_out=a0 + a1T + a2T² + a3T³. Cov polynomial coefficients tau txais los ntawm kev ua kom haum cov ntaub ntawv sim, muab qhov tseeb txaus nyob rau hauv qhov kub thiab txias. Kev ua kom zoo suav nrog kev xaiv ib qho kev txiav txim kom tsim nyog- qhov kev txiav txim qis dhau los qhia txog qhov yuam kev, thaum qhov kev txiav txim siab dhau yuav ua rau muaj kev cuam tshuam ntawm kev suav thiab tej zaum yuav ua rau overfitting.

2. Intelligent Optimization Algorithm

Kev sib xyaw ua ke ntawm Particle Swarm Optimization (PSO) thiab Least Squares Support Vector Machine (LSSVM) tau pom tias muaj kev ua tau zoo hauv xyoo tas los no. PSO algorithm yog siv los hloov kho qhov cuam tshuam ntawm tus qauv LSSVM kom ua tiav qhov kev kwv yees siab dua thiab ruaj khov.

Cov txiaj ntsig kev sim qhia tau hais tias txoj kev no ua tiav qhov kev kwv yees qhov tseeb nyob rau hauv cov ntaub ntawv sib txawv thiab cov kev sim ntsuas, thiab txo qhov ua yuam kev piv rau cov qauv linear regression.

3. Qauv Predictive Control (MPC) Algorithm

FPGA-raws li qauv kev kwv yees tswj kev siv thev naus laus zis, los ntawm kev tsim cov qauv kho tsis zoo uas tsis yog kab thiab siv qhov zoo ntawm cov khoom siv sib npaug sib npaug, tuaj yeem ua tiav millisecond- theem teb thiab siab - cov nyiaj them rau qhov tseeb.

Tom qab siv MPC nyob rau hauv qhov cub tawg kub ntsuas qhov system ntawm lub tuam txhab steel, cov nyiaj them nqi hluav taws xob hloov lub sij hawm raug txo los ntawm 3 vib nas this mus rau 8 milliseconds, thiab qhov ntsuas kub qhov yuam kev poob ntawm 5℃mus rau 0.3 degree.

Cov tswv yim tswv yim los txo qhov kev nyuaj siab

Tsis hais txog ntawm txoj kev siv, qhov sib npaug yuav tsum raug ntaus ntawm qhov tseeb thiab qhov nyuaj:

Kev sib xyaw ntawm cov khoom siv nrawm thiab kev ua kom zoo dua software: Siv cov peev txheej ua haujlwm sib luag ntawm FPGAs los daws cov txheej txheem nyuaj thaum ua kom zoo dua software algorithms kom txo cov lej suav.

Adaptive kho algorithms: Tsim cov algorithms uas tuaj yeem hloov kho tsis tau raws li qhov chaw ua haujlwm, txo qhov kev xav tau ntawm phau ntawv cuam tshuam thiab kho kho vajtse.

Cov kev daws teeb meem sib xyaw ua ke: Kev siv cov kev daws teeb meem sib xyaw ua ke, xws li AD8495 thermocouple amplifier, tshwj xeeb tsim los rau K-hom thermocouples, kev sib koom ua ke siv kev sib txuas them nyiaj thiab cov teeb liab txias circuitry.

Kev Txhim Kho Yav Tom Ntej

Nrog rau kev txhim kho thev naus laus zis, thermocouple nonlinear kho yog txav mus rau kev txawj ntse ntau dua thiab kev koom ua ke:

Artificial txawj ntse kev koom ua ke: Dynamic qauv raws li neural network cov qauv xws li LSTM, siv kev hloov pauv kev kawm kom txo tau cov ntaub ntawv kev cob qhia thaum txhim kho kev kwv yees qhov tseeb.

Edge Computing Applications: Distributing some computing tasks to edge devices txo lub nra ntawm lub hauv paus ua haujlwm thiab txhim kho cov lus teb ceev.

Tsis Siv Neeg Calibration Function: Nrog rau kev tsim ua - nyob rau hauv tsis siv neeg calibration algorithm, lub kaw lus tuaj yeem ua tus kheej -calibration ib ntus, txo cov kev tu ncua.

Xaus: Hequan Instrument Technology's Solutions

Tau ntsib cov kev sib tw ntawm thermocouple nonlinear kho, Hequan Instrument Technology Co., Ltd., raws li xyoo ntawm kev lag luam kev paub thiab kev siv tshuab tsub zuj zuj, tau tsim cov kev daws teeb meem tshiab:

Peb cov thev naus laus zis thev naus laus zis siv cov kev hloov pauv hloov pauv hloov pauv cov txheej txheem, uas tuaj yeem ua kom zoo dua qhov tsis zoo raws li qhov chaw ua haujlwm, ua tiav qhov ntsuas qhov tseeb txog li ± 0.1 degree; Nyob rau tib lub sijhawm, peb cov kev daws teeb meem kev sib xyaw ua ke zoo heev txo cov txheej txheem nyuaj, ua rau cov neeg siv khoom yooj yim ua tiav siab - ntsuas qhov ntsuas kub tsis tas yuav tsum muaj kev paub dhau los.