Order Analysis

In rotating and reciprocating machines, varying load conditions and imperfections in the moving parts cause vibrations and associated sounds. The vibrations are shaped by the structural properties of the moving and stationary parts of the machine.

Typical applications include rotating machinery analysis and processing vehicle or engine speed sweeps (run‐up/down) with respect to RPM or other time‐varying quantities. Fixed-bandwidth FFT order analysis is best suited for situations where sweep rates are relatively small or, for faster speed sweeps where the lower order numbers are of interest. Tracked order analysis is recommended for high-accuracy analyses of higher orders and fast-speed sweeps.