# Excitations

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For cylindrical gear pairs three types of excitations can be defined:

- A mesh excitation is defined on the path of contact. Pitch errors will lead to excitations based on gear mesh frequencies. Higher orders can be defined using the input of harmonic.

- An excitation based on roundness errors of the gear 1 can be defined. Here a variation of the radius is used. The base frequency is the rotation speed of the gear.

- An excitation based on roundness errors of the gear 2 can be defined like for gear 1.

The excitations are considered in the calculation of harmonic response. They will not affect the results of quasi-static calculation and will not affect safety factors for gears.

**(./images/GearExcitation.png)**