Vibration Theory and Terminology: Cycle

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Fig 1: Identifying Powertrain Vibration Cycles

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	1st Cycle
2	2nd Cycle
3	3rd Cycle
4	Time

Fig 2: Identifying Vibration Cycles In Powertrain Components

Courtesy of GENERAL MOTORS CORP.

Callout	Component Name
1	Spindle
2	Pinion Nose

The word cycle comes from the same root as the word circle. A circle begins and ends at the same point, as thus, so does a cycle. All vibrations consist of repetitive cycles.