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Growing Science » Authors » M. Fera

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Sort articles by: Volume | Date | Most Rates | Most Views | Reviews | Alphabet
1.

A modified genetic algorithm for time and cost optimization of an additive manufacturing single-machine scheduling Pages 423-438 Right click to download the paper Download PDF

Authors: M. Fera, F. Fruggiero, A. Lambiase, R. Macchiaroli, V. Todisco

DOI: 10.5267/j.ijiec.2018.1.001

Keywords: Additive Manufacturing, Scheduling, Time, Cost, Metaheuristics, Production Planning

Abstract:
Additive Manufacturing (AM) is a process of joining materials to make objects from 3D model data, usually layer by layer, as opposed to subtractive manufacturing methodologies. Selective Laser Melting, commercially known as Direct Metal Laser Sintering (DMLS®), is the most diffused additive process in today’s manufacturing industry. Introduction of a DMLS® machine in a production department has remarkable effects not only on industrial design but also on production planning, for example, on machine scheduling. Scheduling for a traditional single machine can employ consolidated models. Scheduling of an AM machine presents new issues because it must consider the capability of producing different geometries, simultaneously. The aim of this paper is to provide a mathematical model for an AM/SLM machine scheduling. The complexity of the model is NP-HARD, so possible solutions must be found by metaheuristic algorithms, e.g., Genetic Algorithms. Genetic Algorithms solve sequential optimization problems by handling vectors; in the present paper, we must modify them to handle a matrix. The effectiveness of the proposed algorithms will be tested on a test case formed by a 30 Part Number production plan with a high variability in complexity, distinct due dates and low production volumes.
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Journal: IJIEC | Year: 2018 | Volume: 9 | Issue: 4 | Views: 6932 | Reviews: 0

 
2.

Cost models of additive manufacturing: A literature review Pages 263-283 Right click to download the paper Download PDF

Authors: G. Costabile, M. Fera, F. Fruggiero, A. Lambiase, D. Pham

DOI: 10.5267/j.ijiec.2016.9.001

Keywords: Additive manufacturing Additive manufacturing cost model

Abstract:
From the past decades, increasing attention has been paid to the quality level of technological and mechanical properties achieved by the Additive Manufacturing (AM); these two elements have achieved a good performance, and it is possible to compare this with the results achieved by traditional technology. Therefore, the AM maturity is high enough to let industries adopt this technology in a more general production framework as the mechanical manufacturing industrial one is. Since the technological and mechanical properties are also beneficial for the materials produced with AM, the primary objective of this paper is to focus more on managerial facets, such as the cost control of a production environment, where these new technologies are present. This paper aims to analyse the existing literature about the cost models developed specifically for AM from an operations management point of view and discusses the strengths and weaknesses of all models.
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Journal: IJIEC | Year: 2017 | Volume: 8 | Issue: 2 | Views: 9554 | Reviews: 0

 
3.

The role of uncertainty in supply chains under dynamic modeling Pages 119-140 Right click to download the paper Download PDF

Authors: M. Fera, F. Fruggiero, A. Lambiase, R. Macchiaroli, S. Miranda

DOI: 10.5267/j.ijiec.2016.6.003

Keywords: Supply chain, Order penetration point, Uncertainty

Abstract:
The uncertainty in the supply chains (SCs) for manufacturing and services firms is going to be, over the coming decades, more important for the companies that are called to compete in a new globalized economy. Risky situations for manufacturing are considered in trying to individuate the optimal positioning of the order penetration point (OPP). It aims at defining the best level of information of the client’s order going back through the several supply chain (SC) phases, i.e. engineering, procurement, production and distribution. This work aims at defining a system dynamics model to assess competitiveness coming from the positioning of the order in different SC locations. A Taguchi analysis has been implemented to create a decision map for identifying possible strategic decisions under different scenarios and with alternatives for order location in the SC levels. Centralized and decentralized strategies for SC integration are discussed. In the model proposed, the location of OPP is influenced by the demand variation, production time, stock-outs and stock amount. Results of this research are as follows: (i) customer-oriented strategies are preferable under high volatility of demand, (ii) production-focused strategies are suggested when the probability of stock-outs is high, (iii) no specific location is preferable if a centralized control architecture is implemented, (iv) centralization requires cooperation among partners to achieve the SC optimum point, (v) the producer must not prefer the OPP location at the Retailer level when the general strategy is focused on a decentralized approach.
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Journal: IJIEC | Year: 2017 | Volume: 8 | Issue: 1 | Views: 12568 | Reviews: 0

 

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