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1、PrintthispageGlossaryofCommonlyUsedVibrationandVibrationControlTermsAbsolute.Atermappliedtocalibration(e.g.ofanaccelerometer)basedupontheprimarystandardsofmass,lengthandtime.(Seealsocomparisoncalibration.)Absorber.Adevicecapableofsoakingupvibration.Acceleration.Accelerati
2、onisrateofchangeofvelocitywithtime(denotedasdv/dtord2x/dt2),alongaspecifiedaxis,usuallyexpressedingorgravitationalunits.Itmayrefertoangularmotion.Accelerometer.Asensorortransducerorpickupforconvertingaccelerationtoanelectricalsignal.Accuracy.Thecapabilityofaninstrumenttoi
3、ndicatethetruevalue.Donotconfusewithinaccuracy(sumofhysteresis+non-linearity+temperatureeffect,etc.)norwithrepeatability.Aliasing.Aspectrumanalysisproblemresultingfromsamplingdataattoolowarate.Itcauseshigh-frequencysignalstoappearinaspectrumatlowfrequencies.Amplitude.Them
4、agnitudeofvariation(inachangingquantity)fromitszerovalue.Alwaysmodifyitwithanadjectivesuchaspeak,RMS,average,etc.Mayrefertodisplacement,velocity,acceleration,voltage,currentforceofpressure.AngularFrequency.(Alsoknownascircularfrequency.)ωisthetorsionalvibrationfrequencyin
5、radianspersecond.Ordivideby2πandexpressinhertz(Hz)or(obsolete)cyclespersecond(cps).Average.Refertoatextbookonelectricalengineering.Intheexclusivecaseofapuresinewave,theaveragevalueis0.636xpeakvalue.Averaging.Summingandsuitablydividingseverallikemeasurementstoimproveaccura
6、cyortolessenanyasynchronouscomponents.Balancing.(Mechanical)Adjustingthedistributionofmassinarotatingelement,toreducevibratoryforcesgeneratedbyrotation.Broadband.Vibrations(orothersignals)whichareunfiltered.Signalsatallfrequenciescontributetothemeasuredvalue.Calibration.(
7、Asappliedtovibrationsensors)Anorderlyprocedurefordeterminingsensitivityasafunctionoffrequency,temperature,altitude,etc.ChargeAmplifier.Anamplifierwhichconvertsachargeinputsignal(asfromanaccelerometer)intoanoutputvoltage;charge-to-voltageconverter.Coherence.Ameasureofthesi
8、milarityofvibrationattwolocations,givinginsightintopossiblecauseandeffectrelations.Comparison.At
