VIBRO-MECHANICAL ANALYSIS OF VENTILATION SYSTEMS IN SPECIALIZED INDUSTRIAL ENTERPRISES: CASE STUDY AND EXPERIMENTAL ANALYSIS OF THE VOD-2.1 AXIAL FAN IN MINING VENTILATION

Mădălin ANDREICA, Angela Maria ANDREICA, Mădălina DANILĂ, Dan Codruț PETRILEAN

Abstract


This paper presents a vibro-mechanical analysis of the VOD-2.1 axial fan used for primary mining ventilation. Triaxial vibration measurements were collected at bearing housings and motor supports under varying coupling stiffness and misalignment conditions, following a controlled experimental program informed by prior in-situ studies. Time- and frequency-domain (FFT) analyses were applied to identify dominant vibration components, harmonics, and fault signatures associated with misalignment, imbalance, and coupling characteristics. The results demonstrate that coupling stiffness and misalignment significantly influence the spectral response, with stiffer couplings producing higher harmonic amplitudes and broader spectral content. Based on these findings, diagnostic guidelines and maintenance recommendations are proposed in accordance with ISO 20816/ISO 10816 to enhance the reliability and safety of mine ventilation systems.

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