Onboard aircraft engine nonstationary acoustic data

This dataset contains a one-minute signal recorded in flight aboard an Embraer ERJ-145 (LR/XR) aircraft equipped with two Rolls-Royce AE 3007 A1/A1E turbofan engines. The signal was acquired using the smartphone’s built-in microphone at a sampling rate of 44.1 kHz. It is intended for research on nonstationary vibration analysis, instantaneous angular speed estimation, and order-based diagnostics in aeronautical propulsion systems. 

Dominant kinematic content observed:

Fan spool (N1): 200 – 230 Hz (≈ 12 000 – 13 800 rpm)

Core spool (N2): 660 – 760 Hz (≈ 39 600 – 45 600 rpm)

The signatures of both engines are visible in the acquired data, resulting in multiple closely spaced harmonic components that can be analyzed using time–frequency or order-tracking methods.