Bearings Periodic Frequencies
 
  Enter Part Number and Operating Speed (RPM). "Calculate" button will calculate the sound frequencies of the bearing.
      Part Number
     
Operating Speed rpm  
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View the technical paper:
Bearing Dynamics and Sound
     
Bearing Type    TRB
 Part Number  
Element Value Other Terms / Comments
     
BPFI - Ball or Roller Pass Frequency - Inner     
BPFO - Ball or Roller Pass Frequency - Outer     
BSF - Ball or Roller Spin Frequency     
FTFI - Fundamental Train Frequency - Inner Rotation     
FTFO - Fundamental Train Frequency - Outer Rotation     
 
Operating Speed  60   rpm  
HZ   rps  
Frequencies Resulting From Component Irregularities HZ  
f0 or f1 - Eccentricity or Out-Of-Round Rotating Member     
f2 - Ball or Roller Irregularity    =BSF * RPS * 2
Ball or Roller Spin Frequency    =BSF * RPS
f3 - Inner Race Irregularity    =BPFI * RPS
f4 - Outer Race Irregularity    =BPFO * RPS
f5 - Ball or Roller Size Variations - Rotating Inner    =FTFI * RPS
f6 - Ball or Roller Size Variations - Rotating Outer     =FTFO * RPS