Towards Modular and Coordinated Manufacturing Systems Oriented to Services (original) (raw)

Framework for collaborative manufacturing systems based in services

2009

Nowadays, there is a trend for industry reorganization in geographically dispersed systems with productive activities distributed in autonomous manufacturing systems. Advances in mechatronics, communication, and information technologies support the viability of this structure. These productive systems are composed by several modules (sub-systems), with specific services, which must maintain collaborative relationship among them in order to assure the expected performance of overall system. In this way, this paper proposes a collaborative distributed framework based on "web services" to assure effective service coordination in the execution of manufature processes in distributed environment. This framework has special features such as teleoperation and remote monitoring of manufacturing activities, users online request, and shared resources management. Based on the nature of this type of systems they are considered as discrete event systems (DESs), and techniques derived from Petri nets (PN), including the Production Flow Schema (PFS), can be used in a PFS/PN approach for modeling. This approach has been proven efficient for hierarchical description, analysis and control of DES. The system is approached in different levels of abstraction: a conceptual model which is obtained by applying the PFS technique and a functional model which is obtained by applying PN. Finally, a particular implementation of the proposed framework is presented, in which different and specific issues of distributed manufacturing systems are considered.

Petri nets and manufacturing systems: An examples-driven tour

There exists ample literature on Petri nets and its potential in the modelling, analysis, synthesis and implementation of systems in the manufacturing applications domain (see for example ; moreover, in [65] an important bibliography is presented). This paper provides an examples-driven perspective. Nevertheless, not only complete examples from the application domain are considered. Manufacturing systems are frequently large systems, and conceptual complexity often appears because of some particular "local" constructions. The examples considered in this selected tour try to introduce in a progressive way some applied concepts and techniques. The starting point is an assembly cell, for which models concerning several phases of the design life-cycle are presented. Afterwards, some pull control and kanban management strategies are modelled. Then, two coloured models of production lines are presented. After that, a manufacturing system with two cells is modelled, and the difficulty of the practical analysis is shown. For very populated manufacturing systems or systems with high cadence, relaxation of discrete event models leads to hybrid and continuous approximations, an example of which will be introduced.

A systematical approach to expose manufacturing system as a service

2010 9th IEEE/IAS International Conference on Industry Applications - INDUSCON 2010, 2010

Nowadays, the manufacturing industry trends for reorganization in geographically dispersed systems with manufacturing activities realized by distributed and autonomous components. Advances in mechatronics, automation, communication, and information technologies support the feasibility of these novel structures. In this sense, SOA (Service Oriented Architecture) is a way to treat the distribution of manufacturing resources considering the heterogeneous nature of this environment. Aim to guarantee the autonomy and interoperability of manufacturing system service, a systematical procedure is presented to define properly these services. These manufacturing services consider operations such as teleoperation and remote monitoring of manufacturing activities, users online request, and shared resources management. Based on the nature of this type of system it is considered

Manufacturing operational management modeling using interpreted Petri nets

Gestão & Produção, 2020

The dynamics of the interaction between different levels in production system is the study of many research groups to seek a better understanding of the complex nature of such systems to propose an effective and efficiency from rational use of available resources and required inputs. Demand for products increasingly customized by a dynamic and competitive market has reduced considerably the life cycle of such products and flexibility of production processes has become essential for companies. Flexibility is not only one attribute, but a set of attributes that provides the flexibility for production systems. The interactions between the flexible subsystems are sources of waste and rework, causing high costs in the production process. In this sense, the concept of Lean Manufacturing has promoted a restructuring of some processes of the MES (Manufacturing Execution Systems), responsible for managing the activities of production, integrate data from the ERP (Enterprise Resource Planning) and synchronize production tasks the flow of materials, making them oriented by the demand. One other important aspect in the industrial context is the new future vision promoted by Industry 4.0 paradigm that is envisioned a complete decentralization of control of the production system by autonomous and intelligent devices interconnected by a communication system, that contribute to the global goals of the enterprise. The ANSI/ISA S95 presents a conceptual model that may contribute to the implementation of the industry 4.0 concept. The objective of this study is to present a proposal for modeling of objects in level 3 of the S95 standard using interpreted Petri nets.

Modeling Framework for Automated Manufacturing Systems Based on Petri Nets and ISA Standards

Studies in Informatics and Control, 2013

This work presents a systematic methodology to model Automated Manufacturing Systems using Petri Nets. The modelling strategy consists in the definition and the interconnection of some generic Petri Net models applied to the discrete-event dynamic behaviour of the equipments and its procedures. It is based on the industrial standards ISA-88 and ISA-95, where the classification of equipment and the definition of their generic process tasks are suggested, separately of the product manufacturing recipes. The approach provides a formal and ordered methodology to study industrial automated systems where the equipment availability, storage limitations, sharing resources and logic precedence between process tasks appear in the Petri model. A complete case of study related to an automated cell is presented which includes a network of PLC's and industrial robots.

Using Petri net models at the coordination level for manufacturing systems control

Robotics and Computer-integrated Manufacturing, 1994

This paper focuses on the coordination of manufacturing systems. A software architecture for manufacturing systems control is presented. The architecture follows a hierarchical approach for control, ranging from real-time coordination to long-term scheduling, where the different layers share a common knowledge base. A knowledge representation schema for manufacturing systems is proposed. This schema integrates knowledge representation techniques based on frames and high-level Petri nets to describe plant behaviour, and it follows an object-based methodology. The coordination function is materialized by making the coordination model evolve; this is done by a centralized, concurrent and interpreted implementation of the underlying Petri net.

Petri Net Modeling of a Production System with Parallel Manufacturing Processes

Journal of Science and Arts

This paper presents the modelling and control of a flexible manufacturing system with integrated Industry 4.0 concepts using Petri nets. The flexible manufacturing system is composed of 7 workstations that ensure the assembly and disassembly of two types of products on two parallel production processes. The two parallel processes, in-line and in-cell production processes, ensure the assembly of the products and disassembly of the defects with a minimal number of stations. wo types of controls, local and centralized, are implemented in the control of production processes. The local control, based on the PLCs of each station, ensures the control of the assembly process at the workstation level. The centralized control ensures the obtaining of desired results at the level of interaction between the stations and also the implementation of the optimization algorithm results. To better understand and develop the control of the system a Petri net model was developed. Based on the propertie...

A review of petri-net applications in manufacturing

The International Journal of Advanced Manufacturing Technology, 1992

Petri-nets (PNs) can model concurrent and synchronous activities in a manufacturing system at various levels of abstraction. They have been used for modelling manufacturing systems, knowledge representation on the shop floor, process-plarming applications, decisionsupport tasks, etc. PNs are being used in a growing variety of application areas. This paper focuses on PN applications in manufacturing. A comprehensive review of research is provided. The paper also describes the design and application of PNs in the modelling of a manufacturing cell the representation of the working of the cell at various levels' of" abstraction, and the inferences that can be drawn through PN use. Ideas for future research are presented.

Petri-Net Based Approaches to Flexible Manufacturing Systems

This paper describes the planning process in flexible manufacturing systems. Flexible manufacturing system consisting of machines, computers, robots and automated guided vehicle. The skeleton and the functionality of a Petri Net Toolbox, embedded in the MATLAB environment, are briefly presented, as offering a collection of instruments devoted to simulation, analysis and synthesis of discrete event systems. The integration with the MATLAB [1] philosophy responds to the general interest manifested by educators for enlarging the compatibility between the traditional background of Control Engineering applications and the novelty of discrete-event-systems scenarios. It explains a scheme of labelling and firing which makes modelling convenient for complex systems whose constraints are difficult to express only in terms of firing duration. The system manufacture choose is from the undertake S.C. APULUM S.A. Alba Iulia. Timed Petri nets are used to model operational and routing flexibility ...