In vibration analysis, which set of components is typically monitored to detect rotor and blade faults?

In vibration analysis, which set of components is typically monitored to detect rotor and blade faults?

• A. Pipework and frame vibrations.
• B. Rotor vibration, bearing housing vibration, and blade vibration.
• C. Electrical noise in control circuits.
• D. Exhaust motion.

Answer: (C)

In vibration analysis, faults in rotating hardware show up most directly in the vibrations of the components that actually rotate or support the rotating part. Monitoring the rotor itself, the bearing housing, and the blades gives the most relevant signals for detecting rotor and blade issues. The rotor carries the shaft and experiences problems like imbalance, misalignment, rubbing, or cracks. These faults produce characteristic vibrations measured on or very near the rotor and surrounding structure. The bearing housing reflects faults in the bearings or their supports; when bearings wear or loosen, the housing vibration changes in ways that signal impending failure. Blade vibrations are a direct indicator of blade health—cracks, flutter, or abnormal loading cause distinct vibration signatures that can be detected with sensors directed at the blades or the casing around them. Together, these three areas provide direct, actionable information about rotating component health. Other options don’t target the mechanical fault indicators of rotor and blade components. Pipework and frame vibrations mainly reflect structural or support vibrations, not specific rotor/blade faults. Electrical noise in control circuits is not a mechanical vibration signal, and exhaust motion doesn’t reveal rotor or blade integrity.

In vibration analysis, faults in rotating hardware show up most directly in the vibrations of the components that actually rotate or support the rotating part. Monitoring the rotor itself, the bearing housing, and the blades gives the most relevant signals for detecting rotor and blade issues.

The rotor carries the shaft and experiences problems like imbalance, misalignment, rubbing, or cracks. These faults produce characteristic vibrations measured on or very near the rotor and surrounding structure. The bearing housing reflects faults in the bearings or their supports; when bearings wear or loosen, the housing vibration changes in ways that signal impending failure. Blade vibrations are a direct indicator of blade health—cracks, flutter, or abnormal loading cause distinct vibration signatures that can be detected with sensors directed at the blades or the casing around them. Together, these three areas provide direct, actionable information about rotating component health.

Other options don’t target the mechanical fault indicators of rotor and blade components. Pipework and frame vibrations mainly reflect structural or support vibrations, not specific rotor/blade faults. Electrical noise in control circuits is not a mechanical vibration signal, and exhaust motion doesn’t reveal rotor or blade integrity.