Maintenance Engineering

Bearing Fault Characteristic Frequencies (BPFO, BPFI, BSF, FTF) Calculator

Bearing Fault Characteristic Frequencies (BPFO, BPFI, BSF, FTF) Calculator engineering calculator.

Quick Answer

Calculate Bearing Fault Characteristic Frequencies (BPFO, BPFI, BSF, FTF) Calculator

Calculator

Bearing fault frequency (Hz)
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Result Interpretation

Bearing Fault Characteristic Frequencies (BPFO, BPFI, BSF, FTF) Calculator computes Bearing fault frequency in Hz using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Pitch diameter = 0.085
  • Rolling element diameter = 0.012
  • Number of rolling elements = 12
  • Shaft rotational speed = 1750
  • Contact angle = 0.34906585039887

Expected Result:

  • Bearing fault frequency = 151.78406466294

Engineering Interpretation:

Under the given input conditions, the calculated result is: Bearing fault frequency = 151.78406466294 Hz.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

bearing fault frequency = number of rolling elements * (1/2) * (1 - (rolling element diameter/pitch diameter) * cos(contact angle)) * shaft rotational speed / 60

Formula family: formula_maintenance_vibration_based_bearing_fault_frequency_detector_bpfobpfibsfftf

Variables

SymbolLabelRoleDescription
n Number of rolling elements INPUT Number of rolling elements
d Rolling element diameter INPUT Rolling element diameter
D Pitch diameter INPUT Pitch diameter
alpha Contact angle INPUT Contact angle
rpm Shaft rotational speed INPUT Shaft rotational speed
result Bearing fault frequency OUTPUT Bearing fault frequency
one_half one_half CONSTANT one_half = 0.5 1

Calculation Steps

  1. Enter the number of rolling elements in 1.
  2. Enter the rolling element diameter in m.
  3. Enter the pitch diameter in m.
  4. Enter the contact angle in rad.
  5. Enter the shaft rotational speed in min^-1.
  6. Step 1: Compute bearing fault frequency.
  7. Read the bearing fault frequency (Hz) from the results.

Engineering Summary

Calculate Bearing Fault Characteristic Frequencies (BPFO, BPFI, BSF, FTF) Calculator

Frequently Asked Questions

What does this calculator calculate?

The Bearing Fault Characteristic Frequencies (BPFO, BPFI, BSF, FTF) Calculator estimates Bearing fault frequency based on the input parameters you provide

Why is rolling element diameter important in this calculation?

rolling element diameter is directly proportional to bearing fault frequency. When you enter rolling element diameter in m, the calculator uses it in the engineering formula to compute the output

How should I interpret the result bearing fault frequency?

The calculator outputs bearing fault frequency in Hz. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Rolling element diameter (m), Pitch diameter (m), Contact angle (rad), Shaft rotational speed (min^-1). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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