Foire aux Questions sur les Machines d’équilibrage dynamiques et Answers(A)

Q.InDynamicBalancingdoweneedtosupportthecomponentonthe

machineinthesamelocationasinassembly ?


A.Yesitisnecessarytosupportthecomponentbeingbalancedatthe

sameornearaboutofthebearingsupportsforproperresults.

Dynamicbalancingisaforcebalancingandcouplebalancing

Operation.Thecoupleistheproductofforceandthedistanceto

thepointofsupport. Soitisessentialthatthereallifeconditionsare

replicatedonthebalancingmachines.




Q.InDynamicBalancingMachinedoweneedtorunthecomponent

beingbalancedtooperatingspeed/servicespeed ?


A.Usingadynamicbalancingmachinewemeasuretheunbalancein

theunitsofgrammillimeter. Thequalityandsensitivityofbalancing

Machinedecidesthespeedatwhichyoucanbalancea

Component.InmodernhardBearingdynamicbalancingMachines

Engineersareabletomeasuretheunbalanceatrelativelylower

Speeds.Theunbalancecorrectionseffectedarevalidformostof

Theservicespeedrequirementsofrigidrotors.RefertotheISO

1940standardstodeterminetheresidualunbalancepermittedin

rigidrotors.




Q. Whatarerigidrotors ?

A.Therotorswhichdonotchangeshapewhenspeedofrotation

Augmentations, ortheoneswhichdonotoperateatresonantfrequency,

areclassifiedasrigidrotors.




Q.Whatareflexiblerotors ?

A.Flexiblerotorsarerotorswhichoperateneartheirresonant

fréquence. Thisrunningofmotorgeneratesveryslightdeformation

oftherotor. Flexiblerotorsneedtobebalancedathigherspeeds

andalsoneartheirservicespeeds. Manytimes, insitubalancingis

requiredtoachievedesiredresults.


Q.Whataresoftbearingdynamicbalancingmachinesandhard

bearingdynamicbalancingmachines ?

A.Fewdecadesback, whenbalancingmachineswereintroduced, la

cradleonwhichtherollersweresupportedneededtobemovedto

measurethevibrationlevelsduetounbalance. Withtheadventof

technologyandintroductionofquartztransducerstomeasureforce,

itisnolongerrequiredforthecradlestooscillatetomeasure

vibration.

Themachineswhichcontinuedtohaveoscillatingcradlesand

electrodynamicpicupstomeasurevibrationwereclassifiedassoft

bearingmachines.

Themachineswhichhadrigidcradlesdevoidofanymovementand

measureforceusingpiezoorotherpicupsareclassifiedashard

bearingdynamicbalancingmachines.

Thebasicdesignphilosophyofhardbearingdynamicbalancing

machinesismeasuringforceandtheadvancementof

computationalmathematicsusingmicroprocessorshasenabled

introductionofbalancingmachineswhosecalibrationsarevalidfor

thecompleterangeofspeeds, weightsandqualityrequirements.

Thealgorithmusedfacilitatespermanentcalibrationandhostof

otherfeaturesfordaytodayuseandextremereliability.