Influence of Material Moisture Content on Noise and Vibration Emissions in Woodworking Power Tools

Abstract

Noise and vibration generated by woodworking power tools constitute significant occupational hazards in small- and medium-scale workshops. This study quantified the influence of wood moisture content on noise and vibration emissions during machining under controlled conditions. Representative softwood and hardwood species were processed using common woodworking machines under nominal low- and high-moisture conditions (approximately 20 and 80% MC), verified by oven-dry measurements. At 20% moisture, production noise reached 110.1-113.9 dBA for table saw operations and 101.6-109.7 dBA for band sawing and surface planning, while corresponding values at 80% moisture decreased by approximately 4-11 dBA. Machine-level vibration magnitudes ranged from 2.1-3.0 m/s² at 20% moisture and reduced to 0.7-1.0 m/s² at 80% moisture, with operator-position vibration decreasing from 0.6-1.1 m/s² to 0.1-0.3 m/s². One-way ANOVA confirmed that moisture content significantly affected both noise and vibration emissions (p < 0.05). The regression analysis further demonstrated a bounded linear approximation of the directional change in emission magnitude between the two moisture states (20 and 80%), representing a simplified expression of the rate of change within the experimental range. Despite these reductions, exposure levels frequently exceeded occupational thresholds, indicating that moisture control should complement integrated mitigation strategies rather than serve as a standalone solution.