A low frequency vibration having one beat per revolution of the rotor can be described as which of the following?

A low frequency vibration having one beat per revolution of the rotor can be described as which of the following?

• A. One-to-one Vibration
• B. Phase Vibration
• C. Harmonic Vibration
• D. Beat Vibration

Answer: (A)

In rotor vibration, the important idea is how often the vibration repeats relative to the rotor’s turns. If the vibration completes exactly one full cycle each time the rotor makes one revolution, the vibration frequency matches the rotor speed. That direct one-per-revolution relationship is called a one-to-one vibration. It isn’t about a fixed phase offset, which would describe where in the cycle you are at a given moment rather than how often the cycle occurs per turn. A harmonic vibration would involve more than one cycle per revolution (multiples of the rotation rate). A beat vibration would come from the interference of two close frequencies and would show a modulation pattern rather than a strict one-to-one repetition per revolution. So the description fits one-to-one vibration.

In rotor vibration, the important idea is how often the vibration repeats relative to the rotor’s turns. If the vibration completes exactly one full cycle each time the rotor makes one revolution, the vibration frequency matches the rotor speed. That direct one-per-revolution relationship is called a one-to-one vibration. It isn’t about a fixed phase offset, which would describe where in the cycle you are at a given moment rather than how often the cycle occurs per turn. A harmonic vibration would involve more than one cycle per revolution (multiples of the rotation rate). A beat vibration would come from the interference of two close frequencies and would show a modulation pattern rather than a strict one-to-one repetition per revolution. So the description fits one-to-one vibration.