Abstract
The current context is increasingly driving researchers and industry to focus not only on the economic but also on the energetic performance of manufacturing systems. However, considerable work on the enhancement of energetic performance of complex production systems is still needed. This paper addresses a novel integrated analytical method to evaluate simultaneously the economic and energetic performances of a serial production line composed of unreliable machines and intermediate buffers. This approach is based on a discrete Markov chain formulation of machines states transitions and a birth-death Markov process for buffers states evaluation. It introduces throughput, energy consumption and energy efficiency as key performance indicators for assessing economic and energetic performances. Structural characteristics of the problem are analyzed to establish and evaluate the impact of buffers size, reliability parameters, and production rates of the machines on the energetic performance of the production line. A large experimental study, based on different instances inspired by the literature, is carried out to analyze the behavior and the complex trade-off between throughput and energy efficiency performances.
Highlights
Economies around the world have been able to grow rapidly thanks to the almost unlimited availability of energy and cheap resources
This paper aims to present an analytical method that allows the evaluation of energy consumption and efficiency for serial production lines taking into account their economic performance
PROBLEM FORMULATION The objective of this study is to develop an analytical and computational method that allows the evaluation of both economic and energetic performance of a serial production line
Summary
Economies around the world have been able to grow rapidly thanks to the almost unlimited availability of energy and cheap resources. Starting in the 1970s, a great deal of research has highlighted the consequences of limited resources. Many economies have competed vigorously for access to resources. Energy prices have risen sharply and energy costs have become consequent and human-induced climate change is directly related to global energy consumption. The industrial sector, represents more than 31% of total world energy consumption [19] (Fig.). Improving energy efficiency in manufacturing is becoming an unavoidable necessity for energy conservation, emission reduction, and sustainability. Motivated by financial pressures from increasing energy prices, legislative measures such as eco-design standards for industrial machines, as well as signs of induced climate change, the industrial sector
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