6,036 research outputs found
A review of information flow diagrammatic models for product-service systems
A product-service system (PSS) is a combination of products and services to
create value for both customers and manufacturers. Modelling a PSS based on
function orientation offers a useful way to distinguish system inputs and
outputs with regards to how data are consumed and information is used, i.e.
information flow. This article presents a review of diagrammatic information
flow tools, which are designed to describe a system through its functions. The
origin, concept and applications of these tools are investigated, followed by an
analysis of information flow modelling with regards to key PSS properties. A
case study of selection laser melting technology implemented as PSS will then be
used to show the application of information flow modelling for PSS design. A
discussion based on the usefulness of the tools in modelling the key elements of
PSS and possible future research directions are also presented
A Petri Nets-based Scheduling Methodology forMultipurpose Batch Plants.
This article presents an optimization methodology of batch production processes assembled by shared resources which rely on a mapping of state-events into time-events allowing in this way the straightforward use of a well consolidated scheduling policies developed for manufacturing systems. A technique to generate the timed Petri net representation from a continuous dynamic representation (Differential-Algebraic Equations systems (DAEs)) of the production system is presented together with the main characteristics of a Petri nets-based tool implemented for optimization purposes. This paper describes also how the implemented tool generates the coverability tree and how it can be pruned by a general purpose heuristic. An example of a distillation process with two shared batch resources is used to illustrate the optimization methodology proposed
Recommended from our members
A comparative analysis of business process modelling techniques
Business process modelling is an increasingly popular research area for both organisations and academia due to its usefulness in facilitating human understanding and communication. Several modelling techniques have been proposed and used to capture the characteristics of business processes. However, available techniques view business processes from different perspectives and have different features and capabilities. Furthermore, to date limited guidelines exist for selecting appropriate modelling techniques based on the characteristics of the problem and its requirements. This paper presents a comparative analysis of some popular business process modelling techniques. The comparative framework is based on five criteria: flexibility, ease of use, understandability, simulation support and scope. The study highlights some of the major paradigmatic differences between the techniques. The proposed framework can serve as the basis for evaluating further modelling techniques and generating selection procedures
Modelling and validating the multi-agent system behaviour for a washing machine production line
This paper describes the formal modelling and validation of the behaviour of a multi-agent system that integrates the production and quality control processes in a washing machine production line. The modelling, analysis and validation process uses the Petri nets formalism that provides a rigorous and formal language based on its powerful mathematical foundation, supporting the complete verification of the system correctness during the design phase and before to proceed to the deployment phase. The behaviour models of each agent belonging to the system architecture are edited, analysed and simulated in the PnDK framework
TOWARDS DIGITAL TWIN-DRIVEN PERFORMANCE EVALUATION METHODOLOGY OF FMS
The paper presents a method of automated modelling and performance evaluation of concurrent production flows carried out in Flexible Manufacturing Systems. The method allows for quick assessment of various variants of such systems, considering their structure and the organization of production flow of possible ways of their implementation. Its essence is the conditions imposed on the designed model, limiting the space of possible variants of the production flow only to deadlock-free variants. The practical usefulness of the model implemented in the proposed method illustrates the example, which describes the simultaneous assessment of alternative variants of the flexible machining module's structure and the planned multi-assortment production. The ability of the method to focus on feasible solutions offers attractive perspectives for guiding the Digital Twin-like scenario in situations caused by the need to change the production flow
Engineering of service-oriented automation systems: a survey
The evolution of manufacturing systems and the emergence of decentralised control require flexibility at various
levels of their lifecycle. New emerging methods, such as multi-agent and service-oriented systems are major research
topics in the sense of revitalizing the traditional production procedures. This paper takes an overview of the serviceoriented
approach in terms of platform and engineering tools, from the perspective of automation and production
systems. From the basic foundation to the more complex interactions, service-oriented architectures and its
implementation in form of web services provide diverse and quality proved features that are welcome to different
states of the production systems’ life-cycle. Key elements are the concepts of modelling and collaboration, which
enhance the automatic binding and synchronisation of individual low-value services to more complex and meaningful
structures. Such interactions can be specified by Petri nets, a mathematically well founded tool with features that
enhance towards the modelling of systems. The right application of different methodologies together should motivate
the development of service-oriented manufacturing systems that embrace the vision of collaborative automation.The authors would like to thank the European
Commission and the partners of Network of Excellence
“Innovative Production Machines and Systems”
(http://www.iproms.org/) and the SOCRADES project
(http://www.socrades.eu) for their support.info:eu-repo/semantics/publishedVersio
- …