Which technique is used for spectral analysis of vibration data?

Which technique is used for spectral analysis of vibration data?

• A. Pressure gauge
• B. FFT spectrum analysis
• C. Thermography camera
• D. Ultrasonic thickness gauge

Answer: (B)

Spectral analysis of vibration data relies on revealing the frequency content of a signal rather than just how it changes over time. The standard way to do this is with the Fast Fourier Transform, which converts a time-domain vibration signal into a spectrum that shows how much energy exists at each frequency. By looking at the spectrum, you can identify dominant frequencies and their harmonics, which help diagnose issues like imbalance, misalignment, or bearing faults. The other tools measure different physical things—pressure, surface temperature with an infrared camera, or material thickness with ultrasound—so they don’t provide the frequency-domain view used for analyzing vibration spectra.

Spectral analysis of vibration data relies on revealing the frequency content of a signal rather than just how it changes over time. The standard way to do this is with the Fast Fourier Transform, which converts a time-domain vibration signal into a spectrum that shows how much energy exists at each frequency. By looking at the spectrum, you can identify dominant frequencies and their harmonics, which help diagnose issues like imbalance, misalignment, or bearing faults. The other tools measure different physical things—pressure, surface temperature with an infrared camera, or material thickness with ultrasound—so they don’t provide the frequency-domain view used for analyzing vibration spectra.