Special Issue "Cyber Physical Production Systems"

A special issue of Journal of Manufacturing and Materials Processing (ISSN 2504-4494).

Deadline for manuscript submissions: closed (31 July 2020).

Special Issue Editor

Prof. Dr. Sebastian Thiede
Website
Guest Editor
Chair of Manufacturing Systems, Faculty of Engineering Technology, Department of Design, Production & Management, University of Twente, 7522LW Enschede, The Netherlands
Interests: sustainable manufacturing; cyber physical productions systems; planning and operation of manufacturing systems, life cycle costing (LCC); life cycle maintenance

Special Issue Information

Dear Colleagues,

Without a question, digitalization is one of the major trends in manufacturing—typically associated with terms like Industry 4.0, smart factory or industrial internet—and will have a significant influence on the planning and control of future factories. Cyberphysical production systems (CPPS) are the technical core element of this “4th Industrial Revolution”. As indicated by the name, CPPS consist of a “physical” and an up-to-date “cyber” subsystem (often referred to as “digital twin”) based on continuous data acquisition. With this, decision support or even automatic control functionalities can be enabled. CPPS bear significant potential for improvement and can be applied for production machines, process chains or factories as a whole. Examples can be found in the context of process/machine control, maintenance, energy management, and quality management. However, it is often just singular approaches with a focus on specific CPPS elements or rather conceptual descriptions that can be found so far. Additionally, there is a need for case studies which prove the feasibility and give a clear assessment of benefits but also related drawbacks of CPPS solutions. Against this background, contributions to foster knowledge in those areas are of specific interest for this Special Issue.

Dr. Sebastian Thiede
Guest Editor

Manuscript Submission Information

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Keywords

  • Innovative CPPS concepts and implementations on different levels of manufacturing (machine, process chain, factory)
  • Case studies on CPPS in industrial applications
  • Methods and tools for assessing the feasibility and performance of CPPS
  • CPPS towards sustainability in manufacturing, e.g. energy and resource efficiency
  • Business models bases on CPPS

Published Papers (5 papers)

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Research

Open AccessArticle
Data-Driven Digital Twins for Technical Building Services Operation in Factories: A Cooling Tower Case Study
J. Manuf. Mater. Process. 2020, 4(4), 97; https://doi.org/10.3390/jmmp4040097 - 23 Sep 2020
Abstract
Cyber-physical production systems (CPPS) and digital twins (DT) with a data-driven core enable retrospective analyses of acquired data to achieve a pervasive system understanding and can further support prospective operational management in production systems. Cost pressure and environmental compliances sensitize facility operators for [...] Read more.
Cyber-physical production systems (CPPS) and digital twins (DT) with a data-driven core enable retrospective analyses of acquired data to achieve a pervasive system understanding and can further support prospective operational management in production systems. Cost pressure and environmental compliances sensitize facility operators for energy and resource efficiency within the whole life cycle while achieving reliability requirements. In manufacturing systems, technical building services (TBS) such as cooling towers (CT) are drivers of resource demands while they fulfil a vital mission to keep the production running. Data-driven approaches, such as data mining (DM), help to support operators in their daily business. Within this paper the development of a data-driven DT for TBS operation is presented and applied on an industrial CT case study located in Germany. It aims to improve system understanding and performance prediction as essentials for a successful operational management. The approach comprises seven consecutive steps in a broadly applicable workflow based on the CRISP-DM paradigm. Step by step, the workflow is explained including a tailored data pre-processing, transformation and aggregation as well as feature selection procedure. The graphical presentation of interim results in portfolio diagrams, heat maps and Sankey diagrams amongst others to enhance the intuitive understanding of the procedure. The comparative evaluation of selected DM algorithms confirms a high prediction accuracy for cooling capacity (R2 = 0.96) by using polynomial regression and electric power demand (R2 = 0.99) by linear regression. The results are evaluated graphically and the transfer into industrial practice is discussed conclusively. Full article
(This article belongs to the Special Issue Cyber Physical Production Systems)
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Open AccessArticle
An Agent-Based System for Automated Configuration and Coordination of Robotic Operations in Real Time—A Case Study on a Car Floor Welding Process
J. Manuf. Mater. Process. 2020, 4(3), 95; https://doi.org/10.3390/jmmp4030095 - 18 Sep 2020
Abstract
This paper investigates the feasibility of using an agent-based framework to configure, control and coordinate dynamic, real-time robotic operations with the use of ontology manufacturing principles. Production automation agents use ontology models that represent the knowledge in a manufacturing environment for control and [...] Read more.
This paper investigates the feasibility of using an agent-based framework to configure, control and coordinate dynamic, real-time robotic operations with the use of ontology manufacturing principles. Production automation agents use ontology models that represent the knowledge in a manufacturing environment for control and configuration purposes. The ontological representation of the production environment is discussed. Using this framework, the manufacturing resources are capable of autonomously embedding themselves into the existing manufacturing enterprise with minimal human intervention, while, at the same time, the coordination of manufacturing operations is achieved without extensive human involvement. The specific framework was implemented, tested and validated in a feasibility study upon a laboratory robotic assembly cell with typical industrial components, using real data derived from a car-floor welding process. Full article
(This article belongs to the Special Issue Cyber Physical Production Systems)
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Open AccessArticle
Simulation-Based Multi-Criteria Optimization of Parallel Heat Treatment Furnaces at a Casting Manufacturer
J. Manuf. Mater. Process. 2020, 4(3), 94; https://doi.org/10.3390/jmmp4030094 - 17 Sep 2020
Abstract
This paper presents the development and evaluation of a digital method for multi-criteria optimized production planning and control of production equipment in a case-study of an Austrian metal casting manufacturer. Increased energy efficiency is a major requirement for production enterprises, especially for energy [...] Read more.
This paper presents the development and evaluation of a digital method for multi-criteria optimized production planning and control of production equipment in a case-study of an Austrian metal casting manufacturer. Increased energy efficiency is a major requirement for production enterprises, especially for energy intensive production sectors such as casting. Despite the significant energy-efficiency potential through optimized planning and the acknowledged application potential for sophisticated simulation-based methods, digital tools for practical planning applications are still lacking. The authors develop a planning method featuring a hybrid (discrete-continuous) simulation-based multi-criteria optimization (a multi-stage hybrid heuristic and metaheuristic method) for a metal casting manufacturer and apply it to a heat treatment process, that requires order batching and sequencing/scheduling on parallel machines, considering complex restrictions. The results show a ~10% global goal optimization potential, including traditional business goals and energy efficiency, with a ~6% energy optimization. A basic feasibility demonstration of applying the method to synchronize energy demand with fluctuating supply by considering flexible energy prices is conducted. The method is designed to be included in the planning loop of metal casting companies: receiving orders, machine availability, temperature data and (optional) current energy market price-data as input and returning an optimized plan to the production-IT systems for implementation. Full article
(This article belongs to the Special Issue Cyber Physical Production Systems)
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Open AccessArticle
Combining Simulation and Machine Learning as Digital Twin for the Manufacturing of Overmolded Thermoplastic Composites
J. Manuf. Mater. Process. 2020, 4(3), 92; https://doi.org/10.3390/jmmp4030092 - 11 Sep 2020
Abstract
The design and development of composite structures requires precise and robust manufacturing processes. Composite materials such as fiber reinforced thermoplastics (FRTP) provide a good balance between manufacturing time, mechanical performance and weight. In this contribution, we investigate the process combination of thermoforming FRTP [...] Read more.
The design and development of composite structures requires precise and robust manufacturing processes. Composite materials such as fiber reinforced thermoplastics (FRTP) provide a good balance between manufacturing time, mechanical performance and weight. In this contribution, we investigate the process combination of thermoforming FRTP sheets (organo sheets) and injection overmolding of short FRTP for automotive structures. The limiting factor in those structures is the bond strength between the organo sheet and the overmolded thermoplastic. Within this process chain, even small deviations of the process settings (e.g., temperature) can lead to significant defects in the structure. A cyber physical production system based framework for a digital twin combining simulation and machine learning is presented. Based on parametric Finite-Element-Method (FEM) studies, training data for machine learning methods are generated and a FEM surrogate is developed. A comparison of different data-driven methods yields information on the estimation accuracy of task-specific data-driven methods. Finally, in accordance with experimental cross tension tests, the investigated FEM surrogate model is able to predict the interface bond strength quality in dependence of the process settings. The visualization into different quality domains qualifies the presented approach as decision support. Full article
(This article belongs to the Special Issue Cyber Physical Production Systems)
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Open AccessFeature PaperArticle
Simulation of Smart Factory Processes Applying Multi-Agent-Systems—A Knowledge Management Perspective
J. Manuf. Mater. Process. 2020, 4(3), 89; https://doi.org/10.3390/jmmp4030089 - 09 Sep 2020
Abstract
The implementation of Industry 4.0 and smart factory concepts changes the ways of manufacturing and production and requires the combination and interaction of different technologies and systems. The need for rapid implementation is steadily increasing as customers demand individualized products which are only [...] Read more.
The implementation of Industry 4.0 and smart factory concepts changes the ways of manufacturing and production and requires the combination and interaction of different technologies and systems. The need for rapid implementation is steadily increasing as customers demand individualized products which are only possible if the production unit is smart and flexible. However, an existing factory cannot be transformed easily into a smart factory, especially not during operational mode. Therefore, designers and engineers require solutions which help to simulate the aspired change beforehand, thus running realistic pre-tests without disturbing operations and production. New product lines may also be tested beforehand. Data and the deduced knowledge are key factors of the said transformation. One idea for simulation is applying artificial intelligence, in this case the method of multi-agent-systems (MAS), to simulate the inter-dependencies of different production units based on individually configured orders. Once the smart factory is running additional machine learning methods for feedback data of the different machine units may be applied for generating knowledge for improvement of processes and decision making. This paper describes the necessary interaction of manufacturing and knowledge-based solutions before showing an MAS use case implementation of a production line using Anylogic. Full article
(This article belongs to the Special Issue Cyber Physical Production Systems)
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