EVALUATION OF PHYSICAL AND MENTAL FATIGUE IN AN ASSEMBLY LINE

Yıl 2021, Cilt: 32 Sayı: 3, 380 - 395, 31.12.2021

Aslı Kahya Ayça Recal Yasemin Sevincer Tülin Gündüz Seda Özmutlu

Öz

This study focuses on operator-based ergonomics analysis of the work performed in different stations. This study was carried out at a car seat production assembly line in automotive industry. The workloads of the employees cannot be uniform ergonomically, however the same relaxation allowance was given for all types of work. The relaxation allowance is 6% at MTM (Methods Time Measurement). In this study, fatigue rate is studied under two headings as physical and mental, contrary to the usual physical fatigue only approach. Body moves for lower arm, upper arm, wrist, neck, legs are analysed with MURI and REBA (Rapid Entire Body Assessment) Mental demand, physical demand, effort, performance, temporal demand and frustration were studied with NASA-TLX (NASA Task Load Index) to assess mental fatigue. Physical and mental fatigue were calculated with weights using the AHP method. New resting time coefficients were calculated for each different working type.

Anahtar Kelimeler

Physical Fatigue, Mental Fatigue, MURI, REBA, NASA-TLX, AHP

Kaynakça

• Ayan, B. (2015). Montaj Hattında Ergonomik Risk Unsurlarının İncelenmesi: Otomotiv Sektörüne Yönelik Bir Uygulama [Ergonomic Risk Factors Investigation in Assembly Line: An Application in the Automotive Industry]. Ankara: Ministry of Labour and Social Security, Centre for Labour and Social Security Training and Research. Retrieved from https://www.ailevecalisma.gov.tr/media/3222/montaj_dosya-39-6335.pdf
• Babalık, F.C. (2016). Ergonomics for engineers, Bursa: Dora Publishing.
• Becker, A. B., Warm, J. S., Dember, W. N., & Hancock, P. A. (1995). Effects of jet engine noise and performance feedback on perceived workload in a monitoring task. The International Journal of Aviation Psychology, 5(1), 49-62. https://doi.org/10.1207/s15327108ijap0501_4
• Delice, E. K. (2016). Acil servis hekimlerinin NASA-RTLX yöntemi ile zihinsel iş yüklerinin değelendirilmesi: Bir uygulama çalışması [Evaluation of emergency service doctors’ mental workload through NASA-RTLX method: An application study]. Ataturk University Journal of Economics and Administrative Sciences, 30(3).
• Dul, J., Bruder, R., Buckle, P., Carayon, P., Falzon, P. & Marras, W. S. (2012). A strategy for human factors/ergonomics: Developing the discipline and profession. Ergonomics, 55(4), 377-395. https://doi.org/10.1080/00140139.2012.661087
• Ekinci, E.B.M., & Can, G.F. (2018). Algılanan iş yükü ve çalışma duruşları dikkate alınarak operatörlerin ergonomik risk düzeylerinin çok kriterli karar verme yaklaşımı ile değerlendirilmesi [Evaluation of workers’ ergonomic risk levels considering working postures and perceived workload with multi-criteria decision making approach]. Ergonomi, 1(2), 77-91. https://doi.org/10.33439/ergonomi.478732
• Felekoglu, B. & Tasan, S.O. (2017). Ergonomic risk assessment for work-related musculoskeletal disorders: A systematic reactive / proactive integrated approach. Journal of the Faculty of Engineering and Architecture of Gazi University, 32(3), 777-793. https://doi.org/10.17341/gazimmfd.337625
• Hart, S. G. & Staveland, L. E. (1988). Development of NASA-TLX (Task Load Index): Results of empirical and theoretical research. Advances in Psychology, 52, 139-183. https://doi.org/10.1016/S0166-4115(08)62386-9
• Hignett,S. (1998). Ergonomics. In J. Pitt-Brooke, H. Reid, J. Lockwood, K. Kerr (Ed.), Rehabilitation of Movement. Theoretical Basis of Clinical Practice (480-486). London: W.B Saunders Company.
• Lee, Y. H. & Liu, B. S. (2003). Inflight workload assessment: Comparison of subjective and physiological measurements. Aviation, Space, and Environmental Medicine, 74(10), 1078-1084.
• Matthews, R., Legg, S. & Charlton, S. (2003). The effect of cell phone type on drivers subjective workload during concurrent driving and conversing, Accident Analysis & Prevention, 35(4), 451-457. https://doi.org/10.1016/S0001-4575(02)00023-4
• McAtamney, L. & Hignett, S. (1995). REBA: A rapid entire body assessment method for investigating work related musculoskeletal disorders. Proceedings of the Ergonomics Society of Australia, 45-51, Adelaide.
• Niebel, Benjamin W. & Freivalds, A. (2003). Methods standards and work design. New York, USA: McGraw-Hill.
• Ohno, T. (1998). Toyota production system: Beyond large-scale production. Portland, OR, USA: Productivity Press.
• Saaty T.L. (1988). What is the Analytic Hierarchy Process? In: G. Mitra, H. J. Greenberg, F.A. Lootsma, M. J. Rijkaert, H. J. Zimmermann (Ed.) Mathematical Models for Decision Support. Berlin, Heidelberg: NATO ASI Series (Series F: Computer and Systems Sciences). https://doi.org/10.1007/978-3-642-83555-1_5
• Tubbs-Cooley, H.L., Mara, C.A., Carle, A.C., & Gurses, A. (2018). The NASA Task Load Index as a measure of overall workload among neonatal, paediatric and adult intensive care nurses. Intensive and Critical Care Nursing, 46, 64-69. https://doi.org/10.1016/j.iccn.2018.01.004
• Xu, Z., Ko, J., Cochran, D. J., & Jung, M. C. (2012). Design of assembly lines with the concurrent consideration of productivity and upper extremity musculoskeletal disorders using linear models. Computers & Industrial Engineering, 62(2), 431-441. https://doi.org/10.1016/j.cie.2011.10.008