Course on line analysis of vibrations in gear

When analyzing vibrations in gears, even if the frequency spectrum of the vibrations is often very complicated and seemingly, It can usually be decomposed in the combination of the following effects:

Frequency of gearing and Harmonics

Represent the average deviation from the ideal profile meshing tooth profile, that is, the perfect tooth profile.

Side bands

Components usually originated in the modulation of meshing, caused either by slow variations (by eccentricity) or sudden changes caused by occasional irregularities (bites, slots, etc.).

In addition to the modulation of engagement, the sidebands can also arise modulate a Natural Frequency. In this case indicate the shock repetition rate which excites the Natural Frequency.

Ghosts components

They appear to be a Frequency gearing, but with a different number of teeth that the gear has.

Generally they can be related to the number of teeth of the indexing gear cutter which carried out the machining, and are due to errors in this gear.

Mounting frequency

Component created a pair of gears used when it changed its relative position.

Teeth repetition frequency

Component created when the same pair of gear teeth.

Natural frequencies

Components that arise when a damaged gear begins to cause shock.

Rotation speed and harmonic

Below are links to all five online travel presentations, Vibration analysis gears, namely: