Motion-based prediction of external forces and moments and back loading during manual material handling tasks

Type de document

Études primaires

Année de publication

2020

Langue

Anglais

Titre de la revue

Applied Ergonomics

Résumé

This paper evaluates a method for motion-based prediction of external forces and moments on manual material handling (MMH) tasks. From a set of hypothesized contact points between the subject and the environment (ground and load), external forces were calculated as the minimal forces at each contact point while ensuring the dynamics equilibrium. Ground reaction forces and moments (GRF&M) and load contact forces and moments (LCF&M) were computed from motion data alone. With an inverse dynamics method, the predicted data were then used to compute kinetic variables such as back loading. On a cohort of 65 subjects performing MMH tasks, the mean correlation coefficients between predicted and experimentally measured GRF for the vertical, antero-posterior and medio-lateral components were 0.91 (0.08), 0.95 (0.03) and 0.94 (0.08), respectively. The associated RMSE were 0.51 N/kg, 0.22 N/kg and 0.19 N/kg. The correlation coefficient between L5/S1 joint moments computed from predicted and measured data was 0.95 with a RMSE of 14 Nm for the flexion/extension component. In conclusion, this method allows the assessment of MMH tasks without force platforms, which increases the ecological aspect of the tasks studied and enables performance of dynamic analyses in real settings outside the laboratory.

Mots-clés

Manutention manuelle, Manual handling, Mesure du travail et de l'effort, Measurement of work and effort, Mécanique humaine, Body mechanics, Soulèvement des charges, Manual lifting, Instrument de mesure, Measuring instrument, Technique d'échantillonnage, Sampling method, Évaluation de l'exposition, Exposure evaluation

Numéro de projet IRSST

2017-0019

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