Abstract
Various studies on the issues regarding economic and environmental sustainability in inventory management have been investigated by many researchers in recent years. However, the integration of ergonomics as an aspect of social sustainability in an inventory model is still scarce. This paper presents an extension of ergonomic inventory modeling with a new mathematical model which integrates relaxation allowance and endurance time to the ergonomic inventory model. The rest allowance is determined by endurance time, contraction time, and relative force based on several items such as weight, and it helps to prevent ergonomic risks and fatigue of the back muscles. The model has been analyzed in a numerical work based on our specific simulator and parameteric analysis to present validness in different scenarios. Consequently, our results show that optimization with ergonomics in production line material supply provides notable advantages as it increases overall productivity.
Highlights
Inventory management and lot sizing are critical problems for many industries. e primary focus of the problems is economic sustainability
We applied a numerical example to investigate the cost effects of rest time, where the total request of the production during the examined time period (480 min) related to the first material (Rmat1) is equal to 1440 pcs, that related to the second material (Rmat2) is equal to 960 pcs, that related to the third material (Rmat3) is equal to 480 pcs, the maximum force load of the human spine (Fmax) for picking and storing is equal to 2452.5 N, and it has been calculated according to IS0-11228 on Ergonomics-Manual Handling, Part 1: Lifting and Carrying [67], where the limit for two-handed lifting is 25 kg
Application of the model shows that using the ergonomic rest time and maximum endurance time in this production supply process decreases the total cost of the process with a 13.05% saving compared to the total cost of the production supply process without the ergonomic rest time and maximum endurance time considerations. e reason is that the ergonomic production supply process model decreases the holding cost and the ergonomic cost of the process
Summary
Inventory management and lot sizing are critical problems for many industries. e primary focus of the problems is economic sustainability. Is problem can be handled by holding a lot of stocks at the lines, but this is not an economically sustainable solution as the specific cost of the reserved production area will be expensive. E other solution can be to supply the production lines with higher frequency and to hold a lower level of stocks at the lines In this case, the total cost of the operations will increase. E EOQ and lot-sizing models have been studied and extended by many researchers in accordance with economic (time-varying demand, inflation, shortages, and backlogging), environmental (CO2 emission and environmental cost), and social (human rights, fair labour practices, living conditions, health, and safety) sustainability aspects [2]. There are many studies regarding the environmental and economic sustainability of inventory
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