ANALISIS BEBAN KERJA FISIK DAN MENTAL MENGGUNAKAN CVL DAN NASA-TLX PADA DIVISI PRODUKSI PT X

Hakiim, Azafilmi; Suhendar, Wahidin; Agustina Sari, Dessy · 2018 · Crossref

DOI: 10.35261/barometer.v3i2.1396

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Summary

This study analyzes the physical and mental workload of workers in the production division of PT X, a make-to-order manufacturer of machine spare parts and production equipment. The research was motivated by the need to assess employee performance and identify specific roles with excessive workload, which can lead to fatigue, reduced work quality, and increased absenteeism. The study focuses on eight operators across various stations, including manual milling, CNC milling, manual lathe, CNC lathe, welding, assembling, and quality control. The methodology employed two distinct measurement tools: Cardiovascular Load (CVL) for physical workload and the National Aeronautics and Space Administration Task Load Index (NASA-TLX) for mental workload. Physical workload was assessed by measuring resting and working heart rates at 08:30 and 11:50. CVL was calculated as the percentage of heart rate reserve used during work, classified into categories ranging from no fatigue to immediate action required. Mental workload was evaluated using the NASA-TLX method, which involves paired comparisons to weight six indicators (mental demand, physical demand, temporal demand, performance, effort, and frustration) and subjective rating of these factors. The final Weighted Workload (WWL) score was calculated and categorized from low to very high. The results indicated varying levels of physical strain among the operators. The highest resting heart rates were observed in the manual lathe operator 2 and the quality control operator, suggesting higher baseline fitness, while the lowest were in the manual milling operator 2 and the assembling operator. In terms of CVL, the assembling operator recorded the highest physical load at 31.72%, falling into the category requiring improvement or recovery. This was attributed to the operator standing without ergonomic aids and being 55 years old. All other operators had CVL values below 30%, indicating no immediate fatigue. Regarding mental workload, the manual milling operator 2 exhibited the highest NASA-TLX score of 75.3, classified as "high" workload. This high score was driven by significant frustration and pressure, indicating that this role imposes substantial mental stress on the worker. Other operators scored between 39.3 and 68, falling into moderate to high categories. The study concludes that while most physical workloads are within acceptable limits, the assembling role requires ergonomic interventions to reduce physical strain. Furthermore, the manual milling position presents a significant mental health risk due to high frustration and pressure. These findings provide management with specific data to implement targeted improvements, such as ergonomic adjustments for the assembling station and stress management or workload redistribution for the manual milling role, thereby enhancing overall worker well-being and productivity.

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• workload measurement

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• Empirical Findings: self report data