REVISTA DYNA NEW TECHNOLOGIES

Key words:

flow-shop, tiempo de configuración, makespan, ergonomía, tiempo de recuperación, índice OCRA, trastornos musculo-esqueléticos de las extremidades superiores, flow–shop, setup time, makespan, ergonomic, recovery time, OCRA index, upper–limb musculoskeletal disorders,

Article type:

ARTICULO DE INVESTIGACION / RESEARCH ARTICLE

Section:

RESEARCH ARTICLES

Manufacturer industry is characterized by the presence of a high repetition of movements, which is a major risk factor associated with Work Musculoskeletal Disorders (WMSDs). Moreover this risk factor worsens when there are not adequate rest periods for workers. This paper analyzes the problem and presents a Mixed Integer Linear Programming (MILP) mathematical model to minimize makespan in an n–job flow shop problem with sequence dependent setup times considering recovery times. To do this, the model combines the effectiveness of MILP mathematical model optimization with OCRA ergonomic assessment method. The model calculates work–recovery periods in the worker´s schedulers based on the OCRA included in the UNE–EN 1005–5:2007 and ISO 11228–3:2007 standards. Moreover a case of study in a Food Sector Company is described.