During vibration analysis, look for ___ peaks and see if they repeat. These peaks correlate the frequency peak with the characteristics of a system, such as a motor rotation.

During vibration analysis, look for ___ peaks and see if they repeat. These peaks correlate the frequency peak with the characteristics of a system, such as a motor rotation.

• A. asynchronous
• B. unusual
• C. areas without
• D. synchronous

Answer: (D)

In vibration analysis, look for peaks that repeat in time with the machine’s rotation; these are synchronous peaks because they align with the rotating element’s frequency. These peaks occur at the rotation frequency and its harmonics, directly reflecting the motor’s speed and other rotating characteristics. Because they are in step with the rotation, they repeat consistently in the spectrum and provide clear, repeatable indicators of the system’s operating state. This makes them the most informative for diagnosing rotating components and faults tied to rotation. Peaks that aren’t tied to the rotation—those that are asynchronous—or irregular signals don’t align with the machine’s rotational frequency, so they’re less useful for linking spectral features to the motor’s behavior.

In vibration analysis, look for peaks that repeat in time with the machine’s rotation; these are synchronous peaks because they align with the rotating element’s frequency. These peaks occur at the rotation frequency and its harmonics, directly reflecting the motor’s speed and other rotating characteristics. Because they are in step with the rotation, they repeat consistently in the spectrum and provide clear, repeatable indicators of the system’s operating state. This makes them the most informative for diagnosing rotating components and faults tied to rotation. Peaks that aren’t tied to the rotation—those that are asynchronous—or irregular signals don’t align with the machine’s rotational frequency, so they’re less useful for linking spectral features to the motor’s behavior.