# Cause excessive vibration | My Assignment Tutor

Balancing LabXiuquan SunWhy ？？？Why balance rotating partsCause excessive vibrationReduce service lifeExaggerate surface wearLead to total failureAimTo learn how to statically and dynamically balance a shaft withdifferent combinations of rotating masses.Static balanceis the balancing of forces generated due to the action of gravity.A statically balanced shaft will remain in any angular positionwithout any rotation.Static balance : G1LL G2T T 1 2 If G1=G2T G L  Balance the moment:Dynamic balanceis the balancing of forces and moments generated due to theaction of centrifugal force. Usually, a shaft can rotate withoutvibration when it is dynamically balanced.Dynamic balance :Balance:centrifugal forcetwisting momentF m r   2ExperimentsTwo Mass SystemSimple Three Mass SystemSimple Four Mass SystemExperiment : Static and Dynamic Balance of a Four-Mass SystemGeneral understanding：Statically balancedDynamical balancedImportant ! Calculation !Two Mass systemAnswer : Statically balanced, NOT dynamically balancedIs it balanced ? ? ?Statically balanced, ordynamically balanced ? ? ? G1LL G2G m gT G L  T T 1 2 Simple Three Mass SystemStatically balanced, AND dynamically balancedIs it balanced ? ? ?Statically balanced, ordynamically balanced ? ? ?Simple Four Mass SystemStatically balanced, AND dynamically balancedIs it balanced ? ? ?Statically balanced, ordynamically balanced ? ? ?Rules for Balancing a Shaft1. A statically balanced shaft is not always dynamically balanced2. A dynamically balanced shaft is automatically in static balanceTo achieve dynamic balancing, two different forces must be balanced:• Centrifugal forces• Twisting MomentsRules for Balancing a Shaft• Balance centrifugal forcesFc1 cos1   Fc2 cos2 Fc3 cos3  Fc4 cos4Angular position :

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