Energy efficiency is becoming a key subject in manufacturing, especially if related to the major environmental impact of machining activities. Nowadays, great research efforts are performed to find new methodologies to improve sustainability of manufacturing processes. Energy consumption can be lowered controlling machine state during idle periods. This can be achieved with Energy-Efficient Control (EEC) policies that switch off/on the machine. The same approach can be applied simultaneously to more identical devices in a parallel machines workstation. This paper presents a novel model to identify EEC policies for manufacturing systems composed of parallel and identical machines with finite buffer capacity. In this configuration, each machine can be switched on with a stochastic startup time and switched off instantaneously. The proposed model also considers an availability constraint. Thus, it reduces energy consumption while assuring a target availability level. The control is executed using buffer level information. Numerical results confirm model benefits when applied to a real industrial system from the automotive sector. A sensitivity analysis of the results is also provided.

Energy-Efficient Control Policy for Parallel and Identical Machines with Availability Constraint

Alberto Loffredo;Nicla Frigerio;Ettore Lanzarone;Andrea Matta
2021-01-01

Abstract

Energy efficiency is becoming a key subject in manufacturing, especially if related to the major environmental impact of machining activities. Nowadays, great research efforts are performed to find new methodologies to improve sustainability of manufacturing processes. Energy consumption can be lowered controlling machine state during idle periods. This can be achieved with Energy-Efficient Control (EEC) policies that switch off/on the machine. The same approach can be applied simultaneously to more identical devices in a parallel machines workstation. This paper presents a novel model to identify EEC policies for manufacturing systems composed of parallel and identical machines with finite buffer capacity. In this configuration, each machine can be switched on with a stochastic startup time and switched off instantaneously. The proposed model also considers an availability constraint. Thus, it reduces energy consumption while assuring a target availability level. The control is executed using buffer level information. Numerical results confirm model benefits when applied to a real industrial system from the automotive sector. A sensitivity analysis of the results is also provided.
2021
Switches, Servers, Parallel machines, Manufacturing systems, Workstations, Control systems, Stochastic processes
File in questo prodotto:
File Dimensione Formato  
Energy-Efficient Control Policy for Parallel and.pdf

Accesso riservato

Descrizione: Bozza dell'editore post-referaggio
: Altro materiale allegato
Dimensione 532.44 kB
Formato Adobe PDF
532.44 kB Adobe PDF   Visualizza/Apri
0Energy-Efficient Control Policy for Parallel and.pdf

Open Access dal 02/06/2023

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 696.34 kB
Formato Adobe PDF
696.34 kB Adobe PDF Visualizza/Apri
Energy-Efficient Control Policy for Parallel and Identical Machines With Availability Constraint.pdf

Accesso riservato

: Publisher’s version
Dimensione 1.16 MB
Formato Adobe PDF
1.16 MB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1176356
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 11
  • ???jsp.display-item.citation.isi??? 4
social impact