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Design ｏf the Dａta Acquisｉtion　Ｓysｔeｍ　Ｂased on STＭ３2
AＢSTRＡCT
Ｅarlｙ detectioｎ　ｏf failurｅs in　ｍachinｅｒｙ equiｐｍｅnts is onｅ oｆ the mosｔimｐortant cｏncerｎs to　induｓtry。 In ordｅｒ　tomoniｔor effective　of ｒｏtating　maｃhinｅrｙ， we　deｖelｏｐmeｎt a mｉｃrｏ-cｏntroller uC/OS-II systｅｍ　ｏf sｉｇnal acqｕisｉｔioｎ sｙstｅm ｂased ｏn　ＳTM３2 in　thｉｓ　ｐapｅｒ. we hａve　gｉｖen the whoｌe desｉｇn scheme ｏf ｓyｓtem　ａnｄ　the　mulｔi-chanｎel ｖibrａtion sigｎaｌ in axis Ｘ， Ｙ and　Z of thｅ rotaｒy shaｆｔ ｃan be acｑuired rａpidly　aｎd dispｌａy　in　ｒｅaｌ－tｉme.　Ｏur　ｓystem has tｈｅ charａctｅｒ oｆ sｉmｐle strｕctuｒe， loｗ pｏwｅr　ｃonsumｐｔiｏn, miniatｕriｚation.

Keyworｄs:ＳTＭ32; data　acquｉsitiｏｎ;　embedｄeｄ ｓystem；uＣ／ＯS-II；

1. １。 Ｉｎtｒｏducｔｉoｎ
Tｈe　ｒeaｌ—tiｍe　acｑuｉｓｉtioｎ　of vibｒaｔion in rotａtｉng　mａｃｈｉnery ｃan efｆeｃtively pｒｅｄict， assesｓ　and diaｇnoｓｅ　equiｐment oｐeｒaｔｉon ｓtatｅ,　the　ｉndustry gets ｖiｂraｔiｏn ｄａta ａcｑuisｉtion Ｒａpｉdly　ａnd analysｉｓ in reaｌ－tｉmｅ cａn monitｏr tｈe　ｒotaｔing　machinery ｓtaｔｅ　ａｎｄ　gｕaｒanｔｅｅ ｔhｅ sａfe runnｉng ｏf tｈｅ　ｅquipment． In　order to pｒｅｖｅnt ｆａｉｌure,　ｒedｕcｅ ｍaintenance time， ｉｍpｒｏｖe the　economｉｃ　eｆficiency， Ｔhe　ｐurpoｓｅ　of ｆaｕlｔ dｉagnosis sｙｓｔem cａn ｄｅｔeｃt　thｅse ｄeviｃes tｈrｏugh　the vibrａtｉon　siｇnａl　acquｉｓｉｔion oｆ　rｏtating machinery, ａｎd　ｐroｃesｓ　the data aｃquiｓition,　thｅn iｔ will make timely　judgmeｎt of ｒunｎing state oｆ eｑｕipment　.Whilｅ ｔhe data acquiｓiｔion moｄule iｓ the　corｅ part　of　tｈe ｆauｌt　dｉagnｏsｉs sｙstem [1—4].The practiｃａl aｐplicaｔioｎ ｉn the　iｎdustrｉal ｆield， is the equipｍent　operatiｎg ｐarameｔeｒs will ｂe　acquiｒed to monitｏr equｉpmeｎt ｏperatｉng ｓｔatｅ. In tｒaｄiｔioｎal ｄatａ　acquｉsitioｎ　systems，　thｅ data fｒoｍ acｑuiｓｉｔｉｏｎ ｃａrd are gｅneraｌｌy send ｉnｔｏ ｔhe　ｃｏmｐuter, ａｎd specifｉc　softwarｅ wilｌ be deｖeloped ｆor ｔｈe daｔａ　ａcquiｓiｔion。 The main ｃontrｉbuｔｉｏn oｆ ｔhｉｓ paper haｓ　desigｎｅd the STM32 pｌatfoｒm wｉth ARM tecｈnoloｇy，　that　has ｂｅcome　a tｒadｉtｉonal mainstｒeam ｔechnoｌoｇy iｎ eｍbｅｄｄeｄ ｓystems， aｎd tｈe cｏｌlｅctinｇ dａｔa　ｔoｗａrd　the　directｉon of　high ｒeal-time， ｍulti-paｒameteｒ， hｉgh—pｒｅcｉsion, while　dａta ｓtoｒａge bｅcome ｌarge capａｃity,　more miniaturizatioｎ　and ｐｏrtable， and　thｅ　deveｌoｐｍent　of　ｍulｔicommｕnication ｍｏｄe ａｎd　long—disｔance for ｄａta　tranｓｍisｓion．　Sｏ ａs ｔo　meｅt the　ａcｔual acquisitｉon system ｍultiｔaｓkinｇ requｉrementｓ， this ａrｔicle ｈaｓ deｓigｎed based on SＴM32　ｍicro—cｏntrolｌｅr ｕC／ＯS－II ｓyｓtem ｏf signaｌ ａcｑｕiｓitｉｏn ｓyｓｔem． Tｈｅrｅfore, ｉn　order ｔo　mｅｅt tｈe actuaｌ acquisition　ｓyｓｔeｍ　multitask　requirｅｍents， this novelty oｆ this artｉcle　has　dｅｓigned a sｉgnal ａcquisｉｔion system ｉn mｉcro-contｒolｌer ｕC/OS-II　ｂａsed ｏｎ ＳTM32。

2．Arｃｈitecｔｕre of data　ａｃquisition sysｔeｍ
Daｔa　acquisiｔｉｏn　ａs keｙ ｔeｃhnｏlogy foｒ mｏnitoring ｅｑｕipmeｎt，　rｅcently a lｏt　oｆ　work has ｂeen donｅ on iｔ。 An eｍbｅｄｄed paｒallｅl　ｄata acquisitiｏn system　basｅd ｏｎ ＦPGA iｓ Optｉｍized designed whｉcｈ ｗill make iｔ ｒｅasonabｌｅ　ｔo diｖｉde ａnｄ alloｃaｔｅ higｈ-spｅｅd and lｏｗ—sｐeｅｄ A／D [5］。 Inｓｔｅad， ｉt has　usｅ a hｉｇｈ—speed A／D
ｃonvｅrter aｎd Stｒａtix ＩI ｓerieｓ of　ＦPGA ｆor data coｌleｃtion and ｐｒocｅsｓing，　in which ｔhe maｉｎ ｃontｒibutｉon iｓ used　ｏｆ tｈe Coｍpact Periphｅｒａｌ　Ｃｏmponｅnt Inteｒcoｎnｅct,　tｈe sysｔｅm ｈas tｈe ｃhａｒａｃters　of modulariｚaｔion，　sturｄｉnｅｓs and　scａlability ［6］．Ｂut ｒemoｔe conｔroｌ wiｌｌ ｂe needed　in　Spｅciaｌ Conｄｉtions,　ｔhis pａper intrｏｄuｃe ｔｈe ｅｍbeｄded　ｏｐerａting　ｓysteｍ platfoｒm ｂased on Windowｓ CE　anｄ uC／OＳ-ＩI　tｏ desｉgn ａ remｏte ａｃquisiｔion　ａnd controｌ system with　the GPＲS ｗｉreｌesｓ tｅcｈｎolｏｇｙ ［7－8].Iｎ order to aｃhｉeve the data sharinｇ　ｏf muｌtｉ-user, iｔ　hａｓ　ｂuilｄ tｈｅ embｅddeｄ　dynａmｉｃ ｗｅbsite for datａ ａcquisition mａnaｇemeｎt and diｓｓeｍination wｉｔh ｔhe ARＭ9　and Linux ｏperatiｏn systｅm ［9]．A data collｅcｔiｏn terｍinaｌ ｄeｖices ｉs deｓｉgnｅd based　ｏｎ　ARM7 mｉcroprocessor ＬPC2290 anｄ embeddeｄ rｅal-timｅ ｏｐｅｒatiｎg　system uC/ＯS-IＩ　tｏ ｓoｌve tｈe rｅal-timｅ acｑuisiｔｉoｎ of　multiｃhanneｌ　sｍalｌ　sｉgｎal and multi—chａnnｅl　transmｉsｓiｏｎ［１0］．On tｈe ｏtｈeｒ hands， ｔwo pａrａlｌel ＤSP－based　systｅm　dｅdicated to　tｈe ｄａta　ａcｑuiｓｉtiｏn on rotaｔing machｉnes, and the inｎｅr　signal condiｔioner iｓ usｅd　ｔo adaｐt tｈｅ sensor outｐｕt ｔo　tｈe ｉｎput ｒange of tｈe acquisitiｏn， and tｈen signａｌ ｐoｓｔ-processiｎｇ by ｔｈe dｅsign sｏftware，　whiｌｅ tｈｅ ｍost freqｕeｎtly ｓｔrｕｃture ｉs ｔo uｓe ＤAS ａnd FＰGA－bａsed, aｎd　such　prｏgraｍs arｅ　alｓo dｅｐeｎdenｔ ｏｎ the　DAS cｏst.
Ｉn order　to meeｔ　market ｒequiremenｔs oｆ loｗ power　consuｍption, ｌow　cost， anｄ mobilitｙ，　Fｉｇ.1 ｉn tｈｉs pａｐeｒ preseｎtｓ ｔhe　desiｇｎ overalｌ ｓtrucｔure　dｉａｇｒａm of　daｔa　acqｕisitioｎ system。 Tｈrｏｕgh　SPI ｉntｅrfａｃｅ,　ｔhe syｓtem geｔs　tｈe dａｔa colｌecｔion with　three axis accelｅｒatｉoｎ　ｓeｎsor inｔo　the　SＴM32 controlｌｅr of inner　Ａ/D　conversｉｏn modulｅ ｗitｈ　12-bit， this proｃeｓｓ　ｉs　ｎoｎ-interｆeｒｉnｇ parａｌlel acquisition． Our　system ｕses 24０x4００ LCD ａnd tｏuch ｓcreeｎ module　rｅal—ｔime　ｔo dｉｓｐlaｙ　the cｏllectｅd datａ in　reａl tiｍe．

2．1．　STM32 micro—ｃonｔｒｏllｅｒ
A 3２ bit RIＳC STＭ32F10３VET６， ｕsed aｓ thｅ ｐrocessor　in oｕr system, compared wｉth simｉlar products，　thｅ STM32Ｆ103VET6　ｗｏrｋ at　7２MHZ， wｉtｈ chaｒａcｔeｒs of sｔｒong pｅrfoｒmａnce　ａnd low ｐｏｗer ｃonｓｕｍption, real－tｉme　and low-cost． Ｔhｅ procｅssｏr inｃluｄeｓ: 5１２K　ＦLASＨ, 64K ＳRAM， and　ｉt wiｌｌ ｃommunicａte ｂy usinｇ fiｖe ｓerial　pｏrts whｉcｈ　ｃontａｉn a ＣAN bus， a USＢ2。0 SLAVE mode aｎd ａ　Ｅtｈerｎet　iｎterfａcｅ，　what s mｏre　tｗo　RS2３2 ports arｅ also ｉnclｕdeｄ. Thｅ　systeｍ in our　ｐaper extend the　SＳT25VF０16B serｉal memory throuｇh the SPI bｕs interｆaｃe, that wｉll ｒｅｇarｄ as the　ｔemporａry storage when collect ｌarｇe　nｕｍｂer of ｄata, furthermore, we hａve ｔｈｅ A/D converter with 12　ｂitｓ reｓoｌution,　ａnｄ ｔhe faｓtesｔ conversiｏn up to 1uｓ， wｉｔh 3。6　V　ｆuｌl-scalｅ oｆ　ｔｈe　syｓtem。 In addiｔion ｔo ｄesｉgn　ｏf thｅ　syｓtem pｏwer supｐlｙ ｃirｃuiｔ， tｈe rｅset cｉrｃuit, ＲTC　ｃiｒcｕiｔ and ＧPIO port to assurａnｃe sｙstem needｓ anｄ normal opeｒａｔion.
2.2． Dａｔa aｃquｉsｉtion
Ｔhe mａchine　ｓtate ｉｓ nｏrｍal or noｔ is　maｉnlｙ ｄepended　ｏn thｅ ｖibration　signａl． In thｉｓ pａper， to　acquiｒｅ ｔhe vｉｂraｔｉoｎ data ｏf roｔatｉng mａchinery ｒotor， we havｅ used vibraｔion accelｅrａtion transducｅrs MＭA７4５5L wｈiｃh couｌd cｏｌlect ｔhe　datａ frｏm axiｓ x,　ｙ,　aｎｄ z of　the compａny oｆ Frｅe—ｓcalｅ.　Ｔhe ｋinｄ ｏf　ｖibratｉon ａｃceleratioｎ traｎｓducers has aｄvanｔage of　lｏｗ　cost aｎd sｍall siｚe, high ｓｅnsiｔiｖiｔｙ and ｌargｅ dynaｍic　range with smalｌ interfｅrenｃe。　MMA7455L　is maiｎly ｃｏnsistｓ　of gravity sensｉnｇ unｉｔ ａnd sｉgｎａｌ coｎdｉtiｏning circuit ｃｏｍpoｓitｉｏn，　and tｈis seｎsoｒ will ａmpliｆy the ｔiｎy daｔa　beｆoｒe ｓigｎal pｒeproｃｅssinｇ． In datａ　aｃquisｉtiｏn　procｅss of our sｙsteｍ,　the erｒor　oｆ sａmpling ｓｔage　is ｍainlｙ caｕsed　by ｑuanｔified,　ａｎｄ ｔhe erｒoｒ is　depended on the　ｂｉｔs of ｔhe A／D ｃonverter ,ｗhen ｗe ｒegard ｔｈe maｘimum vｏlｔａｇe as V　max ,　tｈe　AD ｃｏnvｅrter　bits iｓ ｎ，　anｄ the quａntｉｚａtiｏn Q = V max/2ｎ， thｅn, ｔhｅ ｑｕａｎｔization ｅrror iｓ　obeyeｄ unifｏrm　distributioｎ ｉn　［- q ／　2， q / ２］ ［１3］.

The　dｅsiｇned ＳTＭ3２ ｃoｕld ｂuilt ａt　mｏsｔ　three　12－bit　ｐａrａllel ADC in this papeｒ　， whiｃｈ tｈeorｅticａl indｅx　ｉs 72dB and thｅ ａｃtuａl ｄｙｎamｉc ｒａngｅ iｓ between 5４ to　６0ｄB whiｌe 2 or ３ bｉｔs ｉｓ impacted bｙ noiｓe， the　dynamic raｎge　of　meaｓｕrement ｃａn up　ｔo １０00 times　witｈ　60dB。 For ｔhe ｖａst　majoritｙ　ｏf ｔhe　vibrａｔioｎ　signａl，　ｔhe maximum ｓａmpling ratｅ　oｆ 10ｋHZ　cａｎ meet ａctual deｍanｄ， ａnd the higher frequenｃy ｏf　cｏllectioｎ iｓ geneｒally uｓeｄ　ｉn thｅ　8－12 bits AＤ，　theｒefoｒｅ one of cｏntributiｏn of this work is　ｔo cｈoosｅ a built－ｉn 12－bit　A/D　tｏ ｍeeｔ　the ａｃcｕracy of　vibrａtion signａl acqｕisｉtion aｎd ｌoweｒ coｓt in this exｐeｒｉmｅｎｔ．
3。Softwａre　deｓigｎ
3.1。 Transplanｔation of C/OS
In oｒdeｒ　to ensurｅ ｒeaｌ－tｉme and safety ｄatａ collｅction　ｒｅｑuｉreｍents, in thｉs ｓystem,　ａ ｋｉｎｄ of RTＯS whｏse souｒcｅ　coｄｅ　is　open and smａll iｓ pｒopｏsed.　It alｓｏ　can be　ｅaｓｉｌy ｔo ｂｅ ｃut doｗn， reｐotteｄ ａｎd sｏlｉdifｉｅｄ, and ｉts bａsiｃ ｆuncｔiｏnｓ inclｕｄiｎｇ taｓｋ ｍａnａｇｅmeｎt and rｅsourｃe　managｅmｅnt, sｔoｒage mａnagｅｍｅnt ａｎd system management.　The RTOＳ ｅmbeｄded　ｓｙstｅm could suｐport 6４ tasks， wｉth　at moｓｔ 56 user ｔaskｓ， and four tａsks ｏf the　hｉghesｔ　aｎｄ thｅ ｌoｗeｓt prioriｔiｅs ｗｉll　be rｅｔａinｅd in　ｓystem。　Ｔhe ｕＣ/OＳ—IＩ assiｇns ｐｒioritｉeｓ ｏf tｈｅ　taｓｋｓ acｃｏrding tｏ　ｔhｅｉr　importance， ｔhｅ　ｏperaｔion sｙstem execuｔive tｈｅ ｔaｓk　froｍ the priorｉｔy　sequｅnce aｎd each tasｋ have iｎdepeｎｄｅnt prioｒitｙ。　Tｈe oｐerating sｙｓtem kerneｌ　iｓ ｓtｒｅａmｌiｎeｄ, and muｌti-tａｓkiｎg　fｕｎｃtｉon is　ｗelｌ comparｅd wｉtｈ ｏｔhers, it ｃaｎ be tｒanｓplaｎtｅｄ　tｏ processorｓ ｔhat frｏｍ　8－bｉｔ ｔo 6４－ｂit。Tｈe ｔrａｎｓplant ｉn　the　sysｔｅm are　to modifｙ thｅ thrｅe file sysｔem strｕｃture:　ＯS_CPU_C．H OS_CＰU.C, OS＿CPU_A。ASM。　Maｉｎ transplantａｔiｏn procedｕｒe is　aｓ follｏws:
A。 OＳ＿CＰＵ_C．Ｈ
It ｈａs　dｅfiｎeｄ　ｔhｅ　data tｙｐes，　the leｎgth ａnｄ ｇｒowｔh ｄirecｔioｎ oｆ　sｔack　ｉn the　ｐｒocessｏr. Ｂecause differenｔ mｉcroｐrocessｏrs have diffｅrenｔ worｄ ｌength，so tｈｅ uC/OS-ＩI trａnsｐlantａｔion iｎclude ａ series of　tｙpe defiｎition to eｎsuｒe its　pｏrtａbility， anｄ　the ｒeviｓed　code　aｓ foｌｌowｓ:
tｙｐedef ｕｎsignｅd char BＯOLEAＮ;
typedｅf　ｕnsiｇned　chａr ＩNT8U；
tｙpedef signeｄ ｃhar　IＮT8S；
tyｐｅｄef　unsiｇneｄ short INT16U;
typedef ｓignｅd short ＩNT1６Ｕ;
typedef uｎsｉgneｄ int IＮT３2U;
ｔypedef sｉgneｄ int ＩNＴ3２S;
tyｐｅｄef fｌｏat FP32；
typｅdef douｂlｅ FP６4;
tｙpedeｆ unsｉgnｅd int OS_SＴK;
ｔｙpedef unsｉｇｎed inｔ　OS_CＰU_ＳR;
Ｃoｒｔex-M3 ｐrｏcessｏr defiｎes the ＯS_ＥNTER_CRITICAＬ （) ａnｄ OS_EXIT_CRITICAL　（）　as　opening and　ｃｌosing iｎterrupt， aｎd they　must sｅｔ　to　32 bit　of the stacｋ OＳ_ＳTＫ aｎｄ ＣＰＵ rｅｇistｅｒ length.　In adｄitｉｏn, thaｔ has defｉneｄ tｈe　stack poinｔeｒ ＯＳ_ＳTＫ_GROWTH stack groｗｔｈ ｄireｃｔiｏn frｏm high adｄrｅss tｏ ｌower addｒｅss.
Ｂ. ＯS＿CPU.C
To modifｙ ｔhｅ funcｔion OSTaskSｔkInｉt（)　ａccｏrdiｎｇ　ｔｏ　the pｒoｃessor， the　ｎｉne rｅmａｉｎiｎｇ ｕsｅr　interface fｕｎctｉons aｎd hoｏk　functｉons caｎ be null without　spｅｃｉal ｒeqｕiｒｅmentｓ, they wiｌl ｐrｏｄuｃe code　for thesｅ ｆｕnctionｓ onｌｙ　wheｎ　tｈe OＳ＿ＣPU＿ＨOOKS＿EN is sｅt ｔｏ 1 ｉn tｈe ｆiｌe of OS_CFG.Ｈ。 The sｔack inｉtiａlization　function　OSTaｓｋStｋIｎit （) rｅturn　ｔo　ｔｈe new tｏp oｆ the　stａck poinｔer.
OS＿CＰU_A．AＳM
Mｏsｔ ｏｆ　thｅ traｎsplaｎt work are comｐlｅted in　these　docuｍentｓ, and　modify　the　followｉｎg funｃtｉoｎs．　
ＯｓＳｔａrtＨｉghRdy() ｉｓ useｄ fｏｒ runniｎｇ the moｓｔ prｉｏriｔｙ ready task， it wilｌ bｅ　responsible for sｔaｃk　pointer SP　ｆrom　the　hｉgｈesｔ　pｒｉoriｔy taｓk　of TCＢ control block，　anｄ ｒｅｓｔore　tｈｅ CＰＵ, then thｅ　task　ｐｒocｅｓs ｃｒeａted　bｙ the ｕser　ｓｔａrt ｔｏ coｎｔｒol　ｔhｅ ｐrocess.
OSCtxSw （) iｓ for tａsk　sｗitchｉｎg, Whｅｎ thｅ ｃurrenｔ task reａｄy　qｕeuｅ haｖe a higｈer　prｉｏriｔy task,　the　CPU wｉlｌ　ｓtart ＯＳCtxSw （)　ｔask switching　tｏ run the higher prｉority taｓk ａnd the ｃuｒrent ｔask sｔorｅd in tａｓk staｃk．
OSIntＣtｘSｗ （）　has tｈｅ　ｓimiｌａr fuｎcｔioｎ ｗitｈ OSIntＳｗ (), iｎ oｒder ｔo　enｓurｅ　real-tiｍｅ pｅｒfoｒmanｃe of　the syｓtem, it wiｌl ｒun　tｈe higher ｐrｉoriｔy task directｌy　wheｎ ｔｈｅ inteｒrupｔ come， and will not　store ｔhｅ ｃｕrreｎt task.
OＳTｉcｋISR （) iｓ use ｔo　hanｄle ｔhｅ　cloｃｋ ｉnterｒupt， which nｅｅds　interｒupt to schedule its imｐleｍentation ｗhen a hｉgher　prioｒｉty taｓk iｓ　wａｉting fｏr　the clｏｃk sigｎal．
OS＿CPU_SR＿Sａve （） anｄ ＯS_CＰU＿ＳR_Reｓtorｅ （) iｓ compｌeted ｔｏ　ｓwitch　inteｒrupt whｉle ｅｎｔerｉnｇ and leaving　the critiｃal cｏｄe both ｆunctions　implement by the critical prｏtectioｎ funcｔion OS_ENTＥR_CRITICＡL (） ａｎd OS＿ＥＸIＴ_CRITIＣＡL （）．
After thｅ compｌetioｎ oftｈe aｂove　wｏrk，ｕＣ/OS－ＩI can rｕn　ｏn the　processors。
3．2. Sofｔwaｒe ａrchｉｔｅcture
Fｉg.2 shows ｔhe systeｍ ｓoｆtwarｅ aｒｃｈitecｔｕrｅ, so as　to ｄispｌay the dａta visuａｌized,uC/GUＩ3.9０ ａnd　uC／OS—II iｓ ｔraｎsplａnteｄ ｉn the system, our syｓteｍ　containｓ six ｔａsｋｓ suｃh daｔa aｃquiｓition， ｄａta trａnsｍisｓion， LCＤ displaｙ, tｏｕcｈ scrｅen　dｒiveｒ， keｙ－press maｎａｇemenｔ　ａnd　uＣ/GＵI ｉntｅｒface．Firsｔ ｏf all, we　shoｕlｄ set tｈｅ ｔask priorｉtｙ aｎd ｔhe　ｔａsk sｃheduliｎg bａsｅd on the　prｉority．　It needs compleｔe the　ｒequireｄ　dｒivｅｒ　desiｇn　befｏrｅ　thｅ data aｃquisition, ｓucｈ ａｓ　A/D dｒiveｒ, tｏucｈ ｐanｅｌ drivｅr and sｙstem initｉaliｚａtｉｏｎ， whiｌe thｅ iｎitｉalｉzationｓ ｉncludｅ： haｒdwａre pｌatｆorm inｉｔｉａｌiｚａtｉon， ｓystem　clock ｉｎitｉａｌｉzatiｏn，　iｎｔｅrｒupt ｓourcｅ coｎfiguration，　GPＩO poｒt ｃonfｉgurａｔiｏn， ｓeriａｌ porｔ initiaｌｉzatioｎ　aｎd　ｐａramｅｔer configurａｔion， ａnd LＣD　inｉtｉａｌｉzatiｏn． Thｅ　ｐrｏｃesｓ is　thａt　the chaｎnｅｌ mｏdule sent ｓａmｐlｉｎg coｍmanｄ to　ｔhｅ AD cｈａnｎel， ｔhen to inｆｏｒm　the receiｖer module ｉt　hａs ｂeen senｔ　tｈe　sample staｒｔ ｃomｍand, the reｃeiver　ｍｏｄuｌe　ｉs ready　tｏ receive and large　daｔａ will　ｓｔore in tｈe storaｇe　ｍodule， ａｆter ｔhe coｍpｌetion ｏf　the fｉrsｔ sampｌing, chａnnel module wiｌl　seｎｄ　the cｏｍpｌete comｍand of　ｓampｌiｎg to the　receiｖer module, thｅ　ｒeｃeｉver sendｓ ａn ｉnｔerrｕｐt ｒｅquest tｏ　ｔｈe　sｔoｒａge　module to　stop the dａtａ sｔoring， then　the daｔa　ｗill disｐｌａy oｎ the LＣD toｕch screeｎ。 The ｄａta　ａcｑuisition process　shown　iｎ Fig。3

4。Ｅxｐerimeｎtｓ
The exｐｅriment of the ｅmbeddｅd　ｓysteｍ has　bｅｅn doｎe ａnd dａta ａcｑuiｓｉtｉon coｍｅs　froｍ　the　accelｅｒatiｏn oｆ　MＭＡ74５5L， which　is iｎｓtａlｌｅd oｎ　the　ｂｅnch oｆ ｒotatｉｎg machiｎｅ． Tｈe　data　acquiｓition ｈave displayed as　ｓhｏwn in Fｉｇ．４ ａnd Fｉg。5， tｈｅ　sｙｓteｍ　ｃan seleｃt three　cｈａnnels　ｔo ｃolｌect tｈe ｖｉｂrａtion siｇnal froｍ　the ｔｈｒeｅ dirｅctions of X， Y and Z-axis ，　and in ｔhis　paｐｅr ｔhe sampliｎｇ frequeｎcy　is　5KＨZ anｄ　we ｈave collect　tｈe　vibration siｇnal fｒom ｎormａl stａte　ｏf uｎｂaｌanｃeｄ stａte at the　sａｍｅ ｃｈａnnel. Thｅ　resｕlt shoｗs that ouｒ sysｔem ｃan diｓpｌａy reａl-time daｔa acqｕisition anｄ predicｔ　the pｒeliminary diagnｏsis raｐidlｙ．

5。Conclusion
This ｐaper ｈas dｅsｉgnｅd ａn ｅｍbeddeｄ signal acquiｓition ｓystem ｆor real timｅ　ａccordｉnｇ　ｔo the　meｃhaniｃaｌ faiｌｕｒｅ ocｃurred wｉth hiｇｈ ｆrｅqｕency ｏf in the rｏtatｉｎg ｍaｃｈineｓ。　The ｓystem is bａｓed on a lｏｗ cｏst ｍｉｃｒocontrolleｒ, Vibｒation signａls iｓ ｐicked ｂy　thｅ　ｔｈree　axis aｃcelｅratｉon seｎｓor ｗhｉch hａs tｈe performance of　low　ｃｏst anｄ hｉgｈ ｓｅnｓiｔivｉty，　and　the ａcquｉｓition　ｄata　from axｉs ｘ，　y， aｎd　ｚ。 Wｅ have dｅsｉgｎeｄ　the ｓystem hardwaｒe struｃｔure， anｄ anaｌysｅｓ the wｏｒkｉnｇ ｐrinciｐlｅ　of dａta ａcquiｓｉtｉｏｎ　module.　The proposeｄ　sｙsｔem of uC/OＳ—ＩI reａlize tｈe datａ tａsｋ manaｇement ａｎd　sｃhｅdulｉng, and　it ｉs　ｃｏmpacｔｅｄ　witｈ structｕre aｎd ｌoｗ coｓt, ｗhａt’s　more ｔｈe sｙsｔem cｏlleｃｔs the vｉｂration signaｌ　and anａlysｉs ｉｎ ｒeal－time　of tｈｅ rotａｔinｇ machiｎeｓ， aｎd then　quicklｙ givｅs　dｉaｇnostiｃ resultｓ．
Ａｃkｎｏｗledgｅments
This work was ｓupporｔed by Ｔｈe Natioｎal　Nａtｕral Sｃienｃe Fouｎｄatiｏn ｏｆ Chiｎa (5117５1６9)； Ｃhina　Nａtionaｌ　Ｋｅy Teｃhnologｙ R&D Pｒograｍ(20１２ＢAF0２B01）；　Planned Ｓcience ａnd Technoloｇy Prｏjeｃt ｏｆ　Ｈunan Proviｎce(2００９FJ4055)；Scienｔiｆｉｃ Reｓearcｈ Fund of Ｈunan Ｐroviｎciaｌ Eduｃａｔioｎ Departｍent（1０K023）.
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