Drifting Harmonic Interference in Industrial DSP Systems
Introduction Industrial measurement systems operate under constantly changing physical conditions. Rotational speed, load, temperature, and power quality fluctuate over time. These variations cause harmonic interference patterns to drift continuously. Simple static filtering approaches rapidly lose effectiveness. This article explains the nature of drifting harmonic interference in industrial systems and outlines robust characterization strategies. Physical Origins of Drift Common sources include: variable-speed motors load-dependent vibration modes power electronics switching variation thermal expansion effects These mechanisms shift fundamental frequencies and all associated harmonics together. ...