[213] Limitation of vibration spectra

S Mills

SpectrumCBM Ltd, UK. 
Email: simon.mills@spectrumcbm.co.uk 

Vibration spectra are in common use in many vibration monitoring and analysis programmes. Vibration data is usually acquired as a time waveform (time trace). A time waveform will only produce one unique spectrum depending on its sampling and post-processing set-up; however, the same spectrum could have come from an infinite number of time waveforms. This paper reviews cases in which vibration spectra appear to work well and some where they do not.