简介:IntroductionDigitalstronggroundacelerationobservationinstrument,suchasPDR1,SSA1andSSR1producedbyKinemetricsInc.,USAandSCQ?..
简介:Thepropertyofsiliconmicro-capacitiveaccelerometerisanalyzedanddiscussedbyestablishingthemodelofthesensor,tolayabasisforoptimizationdesignofsensorsystemstructure.Discussedissuesincludethestaticmodelinganddynamicbehaviorofthetwocommnlyusedstructures,i.e.,double-cantileversupportedandfour-beamsupportedstructures,andalsothemeasurementrangeofthesedevices.
简介:PackagingofMEMS(micro-electro-mechanicalsystem)devicesposesmorechallengesthanconventionalICpackaging,sincetheperformanceoftheMEMSdevicesishighlydependentonpackagingprocesses.ALandGridArray(LGA)packageisintroducedforMEMStechnologybasedlinearmulti-axisaccelerometers.FiniteelementmodelingisconductedtosimulatethewarpagebehavioroftheLGApackages.Amethodtocorrelatethepackagewarpagetomatrixblockwarpagehasbeendeveloped.Warpageforbothpackageandsensorsubstrateareobtained.Warpagepredictedbysimulationcorrelatesverywellwithexperimentalmeasurements.Basedonthisvalidatedmethod,detaileddesignanalysiswithdifferentpackagegeometricalvariationsarecarriedouttooptimizethepackagedesign.Withtheoptimizedpackagestructure,thepackagingeffectonaccelerometersignalperformanceiswellcontrolled.
简介:Apiezoelectricaccelerometerwithopticalfibertomeasurethedynamicparameterof3dimensionsispresented.TheoperationequationsonX,YandZaxesaredivided,andthetestresultsof3dimensionalsensitivitiesandfrequencyresponse,aregivenaswellasexperimentresultsofvibrationtestwiththissetup.
简介:36从柱子被恢复了的度和顺序的地球重力场模型CDS01S处理了科学轨道和GFZ的机载的加速表数据“sCHAMPsatellite。模型与精确性解决大地水准面比在700km一半波长的一个决定的4厘米好。由使用重力势系数的学位差别变化把模型CDS01S与EIGEN3P,EIGEN1S和EGM96作比较,结果显示系数ofCDS01S离EIGEN3P的那些很靠近。在在上面的精确性ofgeopotential系数之间的比较的结果当模特儿,显示在在EGM96的比那高的CDS01Sis的系数的精确性。直到30个学位的CDS01S和GGM01C的大地水准面波动被计算,标准差是在他们之间的4.7厘米。
简介:AnadaptiveinternalmodecontrolisproposedtoeliminateeffectivelyperiodicdisturbancewithuncertainfrequencycausedbyinputerrorangleofPIGA(PendulousIntegratingGyroAccelerometer).Anadaptivealgorithmwithperiodicdisturbancefrequencyidentificationonlineisappliedandtheinternalmodelcontrollerparametersareadjustedtoeliminatedisturbance.Thentheconvergenceofthisalgorithmandthestabilityofthesystemareprovedbytheaveragingmethod.SimulationresultsverifytheproposedschemecaneliminateperiodicdisturbanceandimprovethetestprecisionforPIGAeffectively.
简介:在不同活动用户dailylife的电话放置的差异增加由使用手机加速表数据认出人的活动的困难。解决这个问题,认出基于的人的活动的一个压缩察觉到的方法压缩了察觉到理论并且利用两个未加工的手机加速表数据和电话放置信息被建议。首先,一个在完全上的字典矩阵用用电话放置信息标记的足够的未加工的tri轴加速数据被构造。然后,稀少的系数为需要被解决L1最小化测试的样品被评估。最后,剩余价值被计算,最小的价值作为指示物被选择获得识别结果。试验性的结果证明这个方法能完成到达89.86%的识别精确性,它比不为识别过程采用电话放置信息的一个识别方法的高。建议方法的识别精确性有效、令人满意。
简介:3-degree-of-freedom(3-DOF)的一个新分析模型旋转罗盘加速表系统由一个1-DOF驱动器和2-DOF感觉模式组成被介绍。模型构造微分方程由向量分析与系统的每DOF联系了的lumped。因此建立的联合微分方程是为他们在时间和频率领域的回答的解决的经分解。就这些频率反应方程而言,新奇设备设计概念被强迫感觉阶段到零导出,它导致在结构的频率之间的某个关系,从而在系统的表演上引起抑制效果的最小化。而且,现在的旋转罗盘加速表结构的可行性在他们的事件为旋转罗盘行动和线性加速的察觉用一个唯一的差别对待的计划被学习。这个计划把旋转罗盘加速表的提出的解决的短暂解决方案与同步解调和过滤的进程相结合,它导致同相并且系统输出的照部件发信号。这二个部件能在尖运动和线性加速的察觉被利用。获得的分析结果被模拟在MATLAB/Simulink环境验证,并且结果在对对方的优秀同意,这被发现。
简介:Background:Accelerometershavebeensuggestedtoprovideadditionalinformationduringthe6-minwalktestwhichmaybeusefulinevaluatingchangesinfunctionalexercisecapacity.TheaimofthestudywastoidentifywhethertheadditionalinformationmeasuredbytheMyWellnessKey~(TM)(MWK)accelerometerduringatreadmill6-minwalktest(t-6MWT)wasrelatedtocurrentlyusedoutcomemeasures.Methods:Fifteenparticipants(9males,6females)performedaself-pacedt-6MWT.RespiratorygasanalysisandwalkingdistanceweremeasuredwhilstwearingtheMWK.Results:Asignificantcorrelationwasestablishedbetweenactivitycountsand6-minwalkdistance(6MWD)(r=-0.847,p<0.001)yetnot6-minwalkwork(6MWW)(r=-0.337,p=0.220).EnergyexpenditureestimatedbytheMWKwasstronglycorrelatedto6MWW(r=0.938,p<0.001)butnot6MWD(r=0.477,p=0.072).TheMWKsignificantlyunderestimatedenergyexpenditure(36.73,CI=33.9-39.7kcal)comparedtogasanalysis(54.35,CI=46.2-61.4kcal)demonstratingpooragreementbetweenthetwoanalyses(Bias=-17.61kcal,Limitsofagreement=-37.4,t2.2kcal).Measurementoftimespentundertakinglight,moderate,andvigorousphysicalactivitywasnotsignificantlydifferent(p>0.05)betweentheMWKandgasanalysis.Conclusion:EstimatedenergyexpenditureprovidedbytheMWKwasstronglycorrelatedto6MWW;however,MWKunderestimatedenergyexpenditureasmeasuredbygasanalysis.TheMWKmayprovideoutcomedatathatsupplementthosecurrentlyprovidedbythe6MWDforfunctionalcapacityassessmentduringthet-6MWT.