Where are accelerometers used in vibration analysis during overhaul?

• A. Placed in the fuel tank
• B. Attached to rotating assemblies to measure vibration signatures
• C. Used only for data storage
• D. Not used in overhaul

Answer: (B)

Accelerometers in vibration analysis are used to capture the dynamic motion of the parts that actually generate most of the vibration. In a turbine engine overhaul, the most informative vibrations come from the rotating parts—the shafts, bearings, gears, and blades. Placing accelerometers on these rotating assemblies lets you obtain vibration signatures that show how the machine is behaving in operation, including the amplitude and frequency content that reveal imbalance, misalignment, bearing wear, looseness, or blade-related faults. This data is then compared to baseline or healthy-assembly signatures to detect anomalies and track condition during maintenance. Sensors placed in a fuel tank wouldn’t measure the critical rotating-motion vibrations, accelerometers aren’t used for data storage, and they are indeed used in overhaul.