An Automated Approach for Adaptive Control Systems

2012 ◽  
Vol 2 (3) ◽  
pp. 58-71
Author(s):  
Mohamed Khalgui ◽  
Olfa Mosbahi ◽  
Emanuele Carpanzano ◽  
Anna Valente
Keyword(s):  
Energy Consumption ◽  
Control Systems ◽  
Manufacturing Systems ◽  
Business Strategies ◽  
Production Lines ◽  
Agent Based ◽  
Intelligent Software ◽  
Adaptive Control Systems ◽  
Manufacturing Platform ◽  
Technical Solutions

The paper deals with adaptive manufacturing systems to be composed of various machines for optimal productions of jobs. The authors assume three types of constraints to be respected: (1) deals with the system’s performance which is related to productivity rates and should be kept acceptable as much as possible, (2) deals with the energy consumption which should be kept stable or minimal, and (3) deals with emissions of CO2 which should be kept minimal for future systems. They define a reconfiguration scenario as any operation allowing addition and/or removals of jobs and/or machines to/from production lines for safety when faults occur. To meet all fixed constraints, the authors propose an agent-based architecture where an intelligent software agent is defined to evaluate the whole system’s architecture after any reconfiguration scenario, and to define useful technical solutions when constraints are violated. It suggests run-time modifications of productivity rates and/or realization times of jobs and/or also removals of some jobs according to well-defined constraints. The users supervising the production lines can dynamically accept or reject these solutions according to production business strategies and also some other constraints. The authors apply the paper’s contribution to a formal drilling manufacturing platform, and to the footwear factory of ITIA-CNR.

Safety Reconfiguration of Embedded Control Systems

2013 ◽  
pp. 184-210
Author(s):  
Atef Gharbi ◽  
Hamza Gharsellaoui ◽  
Mohamed Khalgui ◽  
Antonio Valentini
Keyword(s):  
Control Systems ◽  
Mutual Exclusion ◽  
Periodic Tasks ◽  
Functional Level ◽  
Embedded Control ◽  
Agent Based ◽  
Real Time Operating System ◽  
Embedded Control Systems ◽  
Operational Level ◽  
Technical Solutions

The authors study the safety reconfiguration of embedded control systems following component-based approaches from the functional level to the operational level. At the functional level, a Control Component is defined as an event-triggered software unit characterized by an interface that supports interactions with the environment (the plant or other Control Components). They define the architecture of the Reconfiguration Agent, which is modelled by nested state machines to apply local reconfigurations. The authors propose technical solutions to implement the agent-based architecture by defining UML meta-models for both Control Components and also agents. At the operational level, a task is assumed to be a set of components having some properties independently from any real-time operating system. To guarantee safety reconfigurations of tasks at run-time, the authors define service and reconfiguration processes for tasks and use the semaphore concept to ensure safety mutual exclusions. They apply the priority ceiling protocol as a method to ensure the scheduling between periodic tasks with precedence and mutual exclusion constraints.

Energy Consumption Reduction in Serial Production Lines via Controlled Machine Startup

2011 ◽  
Author(s):  
Guorong Chen ◽  
Liang Zhang ◽  
Jorge Arinez ◽  
Stephan Biller
Keyword(s):  
Energy Consumption ◽  
Capital Investment ◽  
Manufacturing Systems ◽  
Production Systems ◽  
Energy Utilization ◽  
Utilization Efficiency ◽  
Production Lines ◽  
Energy Consumption Reduction ◽  
Consumption Reduction ◽  
Serial Production Lines

Research efforts for energy consumption reduction in manufacturing systems have been centered at technology and process innovation. These projects, however, often involve major capital investment of new equipment and material. In this paper, we explore energy saving opportunities through improvement in factory floor operations. Specifically, in the framework of Bernoulli serial lines, we consider production systems with stripping operations. In such systems, the in-process buffers have to be depleted at the end of each shift to avoid quality deterioration during off-shift periods. Transient analysis of the systems are carried out and formulas to calculate the performance measures are derived. In addition, we investigate the effect of machine startup schedule on the system performances and develop optimal startup schedule which, as shown in the paper, can lead to significant improvement in energy utilization efficiency.

Functional Safety of Distributed Embedded Control Systems

2012 ◽  
pp. 132-170 ◽  
Author(s):  
Atef Gharbi ◽  
Hamza Gharsellaoui ◽  
Mohamed Khalgui ◽  
Samir Ben Ahmed
Keyword(s):  
Control Systems ◽  
Distributed Control ◽  
Software Agent ◽  
Software Components ◽  
Functional Safety ◽  
Embedded Control ◽  
Agent Based ◽  
Embedded Control Systems ◽  
Intelligent Software ◽  
Execution Environment

This chapter deals with the functional safety of distributed embedded control systems following the component-based approach. The authors define a new concept of components called “Control Component” (CC) to cover all of the used technologies in industry. To guarantee the functional safety of distributed control software components, the authors define an agent-based architecture where an intelligent software agent is deployed in a device of the execution environment in order to apply local reconfiguration scenarios, and a coordination agent is used for inter-devices coordination in order to allow coherent reconfigurations.

Real-Time Reconfigurations of Embedded Control Systems

2016 ◽  
Vol 5 (3) ◽  
pp. 71-93 ◽  
Author(s):  
Atef Gharbi ◽  
Hamza Gharsellaoui ◽  
Mohamed Khalgui
Keyword(s):  
Control Systems ◽  
Mutual Exclusion ◽  
State Machines ◽  
Periodic Tasks ◽  
Embedded Control ◽  
Agent Based ◽  
Embedded Control Systems ◽  
Journal Paper ◽  
Operational Level ◽  
Technical Solutions

This paper deals with the study of the reconfiguration of embedded control systems with safety following component-based approaches from the functional level to the operational level. The authors define the architecture of the Reconfiguration Agent which is modelled by nested state machines to apply local reconfigurations. They propose in this journal paper technical solutions to implement the whole agent-based architecture, by defining UML meta-models for both Control Components and also agents. To guarantee safety reconfigurations of tasks at run-time, they define service and reconfiguration processes for tasks and use the semaphore concept to ensure safety mutual exclusions. As a method to ensure the scheduling between periodic tasks with precedence and mutual exclusion constraints, the authors apply the priority ceiling protocol.

scholarly journals Design Model of Flow Lines to Include Switch-Off Policies Reducing Energy Consumption

2020 ◽  
Vol 10 (4) ◽  
pp. 1475 ◽  
Author(s):  
Paolo Renna ◽  
Sergio Materi
Keyword(s):  
Energy Consumption ◽  
Production Rate ◽  
Manufacturing Systems ◽  
Flow Line ◽  
Idle Time ◽  
Design Model ◽  
Production Lines ◽  
Idle State ◽  
Rate Loss ◽  
Line Design

One of the most promising approaches to reduce the amount of energy consumed in manufacturing systems is the switch off policy. This policy reduces the energy consumed when the machines are in the idle state. The main weakness of this policy is the reduction in the production rate of the manufacturing systems. The works proposed in the literature do not consider the design of the production lines for the introduction of switch off policies. This work proposes a design model for production lines that include a targeted imbalance among the workstations to cause designed idle time. The switch-off policy introduced in such designed production lines allows for a reduction in the energy consumed with any production rate loss. Simulation tests are conducted to verify the benefits of switch off policies in production lines designed for its. The simulation results show that the proposed line design allows for a reduction in energy consumption, with a defined loss in the throughput. The application of switch-off policies in the proposed flow line leads to a significant reduction in the energy used in unproductive states controlling the production loss.

scholarly journals An Agent-Based Factory Simulation Tool to Assess Energy Consumption in Decentralized Manufacturing Systems: Agent Types and their Tasks

2017 ◽  
Vol 869 ◽  
pp. 174-179
Author(s):  
Rebecca Ilsen ◽  
Jan Christian Aurich
Keyword(s):  
Energy Consumption ◽  
Manufacturing Systems ◽  
Energy Costs ◽  
Simulation Tool ◽  
Energy Prices ◽  
Simulation Approach ◽  
Agent Based ◽  
Manufacturing Control ◽  
Related Information ◽  
Planning Processes

Rising energy costs and volatile energy prices are motivation to integrate energy consumption with planning processes in manufacturing. Since centralized approaches for Manufacturing Control (MC) tend to ignore local energy related information, it is necessary to examine the potential of decentralized MC approaches. For this purpose, a factory simulation tool has been implemented. This paper presents the underlying assumptions behind the simulation tool and how the MC algorithms it uses are implemented using an agent-based simulation approach.

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