Enter the radial and axial loads, as well as the radial and axial load factors into the calculator to determine the equivalent dynamic bearing load.

Equivalent Dynamic Load Formula

The following equation is used to calculate the Equivalent Dynamic Load.

P = X * Fr + Y * Fa

  • Where P is the equivalent dynamic load (kN)
  • X is the radial load factor
  • Fr is the radial bearing load (kN)
  • Y is the axial load factor
  • Fa is the axial bearing load (kN)

What is Equivalent Dynamic Load?


In a bearing, the equivalent dynamic load consists of the static load and the centrifugal force. The centrifugal force is proportional to the inertia moment of the load. Newton’s second law of motion can be applied in a rotating coordinate system:

How to Calculate Equivalent Dynamic Load?

Example Problem:

The following example outlines the steps and information needed to calculate equivalent dynamic load.

First, determine the radial and axial loads. For this example, these are 10kN and 20 kN respectively.

Next, determine the radial and axial load factor. These are .35 and .65 respectively.

Finally, calculate the equivalent dynamic load using the formula above:

P = X * Fr + Y * Fa

P = .35*10 + .65 * 20

P = 16.5 kN