QInDynamicBalancingdoweneedtosupportthecomponentonthe
machineinthesamelocationasinassembly
ก.Yesitisnecessarytosupportthecomponentbeingbalancedatthe
sameornearaboutofthebearingsupportsforproperresults
Dynamicbalancingisaforcebalancingandcouplebalancing
Operation.Thecoupleistheproductofforceandthedistanceto
thepointofsupport Soitisessentialthatthereallifeconditionsare
replicatedonthebalancingmachines
QInDynamicBalancingMachinedoweneedtorunthecomponent
beingbalancedtooperatingspeed/servicespeed
ก.Usingadynamicbalancingmachinewemeasuretheunbalancein
theunitsofgrammillimeter Thequalityandsensitivityofbalancing
Machinedecidesthespeedatwhichyoucanbalancea
Component.InmodernhardBearingdynamicbalancingMachines
Engineersareabletomeasuretheunbalanceatrelativelylower
Speeds.Theunbalancecorrectionseffectedarevalidformostof
Theservicespeedrequirementsofrigidrotors.RefertotheISO
1940standardstodeterminetheresidualunbalancepermittedin
rigidrotors
Q Whatarerigidrotors
ก.Therotorswhichdonotchangeshapewhenspeedofrotation
เพิ่มขึ้น ortheoneswhichdonotoperateatresonantfrequency
areclassifiedasrigidrotors
QWhatareflexiblerotors
ก.Flexiblerotorsarerotorswhichoperateneartheirresonant
ความถี่ Thisrunningofmotorgeneratesveryslightdeformation
oftherotor Flexiblerotorsneedtobebalancedathigherspeeds
andalsoneartheirservicespeeds Manytimes, insitubalancingis
requiredtoachievedesiredresults
QWhataresoftbearingdynamicbalancingmachinesandhard
bearingdynamicbalancingmachines
ก.Fewdecadesback, whenbalancingmachineswereintroduced การ
cradleonwhichtherollersweresupportedneededtobemovedto
measurethevibrationlevelsduetounbalance Withtheadventof
technologyandintroductionofquartztransducerstomeasureforce
itisnolongerrequiredforthecradlestooscillatetomeasure
สั่นสะเทือน
Themachineswhichcontinuedtohaveoscillatingcradlesand
electrodynamicpicupstomeasurevibrationwereclassifiedassoft
bearingmachines
Themachineswhichhadrigidcradlesdevoidofanymovementand
measureforceusingpiezoorotherpicupsareclassifiedashard
bearingdynamicbalancingmachines
Thebasicdesignphilosophyofhardbearingdynamicbalancing
machinesismeasuringforceandtheadvancementof
computationalmathematicsusingmicroprocessorshasenabled
introductionofbalancingmachineswhosecalibrationsarevalidfor
thecompleterangeofspeeds, weightsandqualityrequirements
Thealgorithmusedfacilitatespermanentcalibrationandhostof
otherfeaturesfordaytodayuseandextremereliability
