س.InDynamicBalancingdoweneedtosupportthecomponentonthe
machineinthesamelocationasinassembly?
احمدYesitisnecessarytosupportthecomponentbeingbalancedatthe
sameornearaboutofthebearingsupportsforproperresults.
Dynamicbalancingisaforcebalancingandcouplebalancing
Operation.Thecoupleistheproductofforceandthedistanceto
thepointofsupport. Soitisessentialthatthereallifeconditionsare
replicatedonthebalancingmachines.
س.InDynamicBalancingMachinedoweneedtorunthecomponent
beingbalancedtooperatingspeed/servicespeed?
احمدUsingadynamicbalancingmachinewemeasuretheunbalancein
theunitsofgrammillimeter. Thequalityandsensitivityofbalancing
Machinedecidesthespeedatwhichyoucanbalancea
Component.InmodernhardBearingdynamicbalancingMachines
Engineersareabletomeasuretheunbalanceatrelativelylower
Speeds.Theunbalancecorrectionseffectedarevalidformostof
Theservicespeedrequirementsofrigidrotors.RefertotheISO
1940standardstodeterminetheresidualunbalancepermittedin
rigidrotors.
س. Whatarerigidrotors?
احمدTherotorswhichdonotchangeshapewhenspeedofrotation
افزایش ortheoneswhichdonotoperateatresonantfrequency
areclassifiedasrigidrotors.
س.Whatareflexiblerotors?
احمدFlexiblerotorsarerotorswhichoperateneartheirresonant
فرکانس. Thisrunningofmotorgeneratesveryslightdeformation
oftherotor. Flexiblerotorsneedtobebalancedathigherspeeds
andalsoneartheirservicespeeds. Manytimes insitubalancingis
requiredtoachievedesiredresults.
س.Whataresoftbearingdynamicbalancingmachinesandhard
bearingdynamicbalancingmachines?
احمدFewdecadesback whenbalancingmachineswereintroduced،
cradleonwhichtherollersweresupportedneededtobemovedto
measurethevibrationlevelsduetounbalance. Withtheadventof
technologyandintroductionofquartztransducerstomeasureforce،
itisnolongerrequiredforthecradlestooscillatetomeasure
لرزش.
Themachineswhichcontinuedtohaveoscillatingcradlesand
electrodynamicpicupstomeasurevibrationwereclassifiedassoft
bearingmachines.
Themachineswhichhadrigidcradlesdevoidofanymovementand
measureforceusingpiezoorotherpicupsareclassifiedashard
bearingdynamicbalancingmachines.
Thebasicdesignphilosophyofhardbearingdynamicbalancing
machinesismeasuringforceandtheadvancementof
computationalmathematicsusingmicroprocessorshasenabled
introductionofbalancingmachineswhosecalibrationsarevalidfor
thecompleterangeofspeeds weightsandqualityrequirements.
Thealgorithmusedfacilitatespermanentcalibrationandhostof
otherfeaturesfordaytodayuseandextremereliability.
