基于STM32的交替式排水量检测系统的硬件设计

HydraulicsPneumatics&Seals／NO．03．2016doi：lO．39694．issn．1008—0813．2016．03．003基于STM32的交替式排水量检测系统的硬件设计桑勇，代月帮(大连理工大学机械工程学院，辽宁大连116024)摘要：土力学试验中的三轴试验仪，能够测量土壤的强度、应力应变及其它力学性能等，是研究土壤特性极其重要的设备。土壤试样在大围压、重载荷下获得的排水量是衡量试样体变的一个重要参数，它的测量精度决定试验的成败。然而对于超大试样体变(排水量)的测量，由于排水量大、排水时间长等特点，对其连续高精度测量是非常困难的。该文提出了一种超大试样体变(排水量)实时连续高精度检测方案，利用自带的12位ADC模块的ARM微处理器STM32F103ZET6对注入A、B量筒内的排水进行连续模数转换和数据处理，根据A、B量筒内注水液面的高度，控制多个电磁阀动作，实现A，B量筒交替注水，{j#水。利用LABVIEW作为上位机通过RS一232串口控制整个检测过程，显示并存储两通道的采集结果。最后对该方案进行了试验验证，试验结果表明，该方案稳定性好，测量精度高，可以实现对超大试样体变(排水量)连续高精度检测。关键词：超大三轴试验；大排水量；高精度；STM32；ADC；LABVIEW中图分类号：TH137；TN219文献标志码：A文章编号：1008—0813(2016)03—0007—05HardwareDesignofAlternatingMeasurementSystemfor舫erDrainageBasedonSTM32SANGYong,DAIrue—bang(SchoolofMechanicalEngineering，DalianUniversityofTechnology,Dalianl16024，China)Abstract：Thetri·axialtestapparatusinsoilmechanicstestcanmeasurethestrengthofthesoil，thestressstrainandothermechanicalprop-e~ies．Itisaveryimportantequipmentforthestudyofsoilproperties．Waterdrainageobtainedfromsoilsamplescompressedbyhighcon—finedpressureandheavyloadisakeymeasurementindexofspecimendeformation．Themeasurementprecisiononwaterdrainagedeter-minestheSuccessofthetest．Howeve~itisverydifficulttoachievethecontinuousandhighaccuracymeasurementforthelargesamplev0l—umechange(waterdrainage)duetothelargeamountofdrainageandalongdrainagetime．Thispaperproposesasolutiontoachievehigh-precisioncontinuousmeasurementforthelargesamplevolumechange(waterdrainage)．ARMmicroprocessorSTM32F103ZET6whichowns12bitADCmoduleisusedtodocontinuouslyanalog-digitalconversionanddataprocessingforwaterdrainagei~ectedintoA，Bgraduatedcylinder．AccordingtothesituationofhowmuchwaterA，Bgraduatedcylinderarefilled．Theelectromagneticvalvesarecon—trolledtoachieveA，Bgraduatedcylinderalternatelyfilling／drainage．LABVIEWisusedasauppercomputertocontroltheentiretestingprocess，displayandstoretwochannelsresults．Accordingtoresultfromexperimentalverification，thissolutionshowshighermeasurementaccuracy,strongerstabilityandcanachievehigh-precisioncont