Periodic Frequency Analysis

Bearings Periodic Frequencies
 
 
  Enter Part Number and Operating Speed (RPM). "Calculate" button will calculate the sound frequencies of the bearing.
Inner Part Number
Part Number
Operating Speed    RPM
Units
Imperial
Metric
Select Type 
View the technical paper:
Bearing Dynamics and Sound
Element Units Value
Bearing  -- TRB-TS    
   
 
Geometry
Number of Rollers per Row -
Pitch Diameter
Mean Roller Diameter
Speeds
S-Inner/Outer or S-Outer/Inner RPS
S-Cage/Outer RPS
S-Cage/Inner RPS
S-Roller/Cage RPS
Frequencies  -  RPM
Eccentricity of Rotating Member - f0 Hz
Out-of-Round or Rotating Member - f1 Hz
Roller Irregularity, e.g., nick or spall - f2 Hz
Inner Irregularity, e.g., nick or spall - f3 Hz
Outer Irregularity, e.g., nick or spall - f4 Hz
Roller Size Variation (Rotating Inner) - f5 Hz
Roller Size Variation (Rotating Outer) - f6 Hz
 
Other frequencies that may occur include the    
following harmonics and modulations of    
Fundamental and harmonic frequencies.    
 
i=harmonic index of the carrier frequency i.e.    
i=1,2,3,4,...    
j=harmonic index of the modulating frequency i.e    
j=0,1,2,3,...    
 
f1 * i    
f4 * i    
f5 * i    
f6 * i    
f4 * i + f1 * j or f4 * i - f1 * j    
f2 * i + f5 * j or f2 * i - f5 * j    
f2 * i + f6 * j or f2 * i - f6 * j