A multi-objective approach for both makespan- and energy-efficient scheduling in injection molding

Abstract

Recent sustainability efforts require machine scheduling approaches to consider energy efficiency in the optimization of schedules. In this paper, an approach to reduce power peaks while maintaining the makespan is proposed and evaluated. The central concept of the approach is to slowly equalize highs and lows in the energy input of the schedule without affecting the makespan through an iterative optimization. The approach is based on the simulated annealing algorithm to optimize machine schedules regarding the makespan and the energy input, using the goal programming method as the objective function.