Process-Level Noise and Vibration Hazard Characterization for Engineering Control Prioritization in a Bottled Water Manufacturing Facility
Abstract
Machine-generated noise and vibration vary considerably across manufacturing processes, yet engineering interventions are frequently implemented without quantitative process-level prioritization. This study characterized workstation vibroacoustic conditions in a semi-automated bottled water manufacturing facility to identify production units requiring priority engineering control. Field measurements of machine generated noise and mechanical vibration were carried out using calibrated sound level and vibration meters, in the polyethylene terephthalate (PET) Blow, Water Treatment and Bottling/Packaging sections during ambient, idle and production operating conditions. Descriptive statistics, coefficients of variation, one-way analysis of variance (ANOVA), Games–Howell post hoc comparisons, and an Engineering Control Priority Index (ECPI) were applied to determine differences between production units and to rank intervention priorities. During production, the Water Treatment and Bottling/Packaging sections had higher mean noise levels (92.83 and 92.32 dB(A)) and vibration accelerations (7.15 and 7.29 m/s²) than the PET Blow section. Significant differences were found for both noise (p < 0.001, η² = 0.723) and vibration (p < 0.001, η² = 0.765). ECPI analysis identified the Water Treatment and Bottling/Packaging sections as the highest priorities for engineering intervention. The proposed framework provides a practical basis for engineering control prioritization and maintenance planning in manufacturing environments.
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