速度、转速和加速度的测量PPT课件

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1、Chapter7Measurementofvelocity,accelerationandvibrationSchoolofmechanicalandpowerengineering/HenanpolytechnicuniversityContents7.1Overview7.2MeasurementofVelocity7.3MeasurementofAcceleration7.4VibrationtestChapterSevenMeasurementofvelocity,accelerationandvibration7.1OverviewMeasurement

2、ofvelocityandaccelerationforvehicle,train,ship,plane,etc，andthatoftheirmovingattitudeRotationalvelocityforoutputshaftspeedofengineandgeneratorVelocityofrolledplate,strip,bar, tubingmaterialMeasurementofvibrationforlargedevicesandengineeringApplicationsininertial navigation7.1OverviewV

3、elocity：avectorwhichshowsthedirectionandrateofmotion.物体直线运动时单位时间内的位移量，m/sAcceleration：avectorwhichshowsthedirectionandmagnitudeofchangesinvelocity.物体运动时单位时间内的速度增量，m/s2RotationalVelocity：物体运动时单位时间内的转数，r/minAngularVelocity：物体单位时间内转过的角度，rad/sContents7.1Overview7.2MeasurementofVelocity7.3

4、MeasurementofAcceleration7.4VibrationtestChapterSevenMeasurementofvelocity,accelerationandvibration7.2MeasurementofVelocityFrommotionform：measurementoflinearvelocity(线速度)andangularvelocity(角速度)Fromreference:measurementofabsolutevelocity(绝对速度)andrelativevelocity(相对速度)Fromnumericalfeatu

5、re:measurementofaveragevelocity(平均速度)andinstantaneousvelocity(瞬时速度)Theaveragevelocityofanobjectisthetotaldisplacementduringsomeextendedperiodoftime,dividedbythatperiodoftime.Averagevelocitymethod光束切断法(短距离平均速度法)AveragevelocitymethodCorrelationvelocitymeasurementAveragevelocitymethodCor

6、relationvelocitymeasurementStronganti-interferenceabilityandmakethemeasurementundercomplexinterferenceconditions.Application:measurementofplane,ship,androllingmillstrip,etc.Inprinciple,twosensorsissetinthedirectionofvelocityofamovingobject,andthevelocitycanbemeasuredusingcross-correla

7、tion principle.AveragevelocitymethodAveragevelocitymethodSpatialfiltervelocitymeasurement(空间滤波器测速法)利用可选择一定空间频率μ的空间滤波器件与被测物体同步运动，然后在单位空间内测得相应的时间频率f，求得运动体的运动速度。Lvμ＝N／Lf＝N／t0PitotTubevelocitymeasurementBernoulli'sequationofidealincompressiblefluid理想不可压缩流体在重力场中作定常流动时，具有三种形式的能量：位势能、压力势能和动能

8、，在流线上