scholarly journals Modelling and Control of Mechatronics Lines Served by Complex Autonomous Systems

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3266 ◽  
Author(s):  
Dragomir ◽  
Mincă ◽  
Dragomir ◽  
Filipescu
Keyword(s):  
Petri Nets ◽  
Real Time ◽  
Autonomous Systems ◽  
The Other ◽  
Added Value ◽  
Control Procedure ◽  
Real Time Control ◽  
Planning And Scheduling ◽  
Time Control ◽  
Wide Range

The aim of this paper is to reverse an assembly line, to be able to perform disassembly, using two complex autonomous systems (CASs). The disassembly is functioning only in case of quality default identified in the final product. The CASs are wheeled mobile robots (WMRs) equipped with robotic manipulators (RMs), working in parallel or collaboratively. The reversible assembly/disassembly mechatronics line (A/DML) assisted by CASs has a specific typology and is modelled by specialized hybrid instruments belonging to the Petri nets class, precisely synchronized hybrid Petri nets (SHPN). The need of this type of models is justified by the necessity of collaboration between the A/DML and CASs, both having characteristics and physical constraints that should be considered and to make all systems compatible. Firstly, the paper proposes the planning and scheduling of tasks necessary in modelling stage as well as in real time control. Secondly, two different approaches are proposed, related to CASs collaboration: a parallel approach with two CASs have simultaneous actions: one is equipped with robotic manipulator, used for manipulation, and the other is used for transporting. This approach is correlated with industrial A/D manufacturing lines where have to transport and handle weights in a wide range of variation. The other is a collaborative approach, A/DML is served by two CASs used for manipulation and transporting, both having simultaneous movements, following their own trajectories. One will assist the disassembly in even, while the other in odd workstations. The added value of this second approach consists in the optimization of a complete disassembly cycle. Thirdly, it is proposed in the paper the real time control of mechatronics line served by CASs working in parallel, based on the SHPN model. The novelty of the control procedure consists in the use of the synchronization signals, in absence of the visual servoing systems, for a precise positioning of the CASs serving the reversible mechatronics line.

A New Flexible Rapid Thermal Processing System

1995 ◽  
Vol 389 ◽  
Author(s):  
K. C. Saraswat ◽  
Y. Chen ◽  
L. Degertekin ◽  
B. T. Khuri-Yakub
Keyword(s):  
Control System ◽  
Real Time ◽  
Processing System ◽  
Process Conditions ◽  
Temperature Uniformity ◽  
Real Time Control ◽  
Wafer Temperature ◽  
Time Control ◽  
Wide Range ◽  
Optical Flux

ABSTRACTA highly flexible Rapid Thermal Multiprocessing (RTM) reactor is described. This flexibility is the result of several new innovations: a lamp system, an acoustic thermometer and a real-time control system. The new lamp has been optimally designed through the use of a “virtual reactor” methodology to obtain the best possible wafer temperature uniformity. It consists of multiple concentric rings composed of light bulbs with horizontal filaments. Each ring is independently and dynamically controlled providing better control over the spatial and temporal optical flux profile resulting in excellent temperature uniformity over a wide range of process conditions. An acoustic thermometer non-invasively allows complete wafer temperature tomography under all process conditions - a critically important measurement never obtained before. For real-time equipment and process control a model based multivariable control system has been developed. Extensive integration of computers and related technology for specification, communication, execution, monitoring, control, and diagnosis demonstrates the programmability of the RTM.

Modelling real-time control of WWTP influent flow under data scarcity

2015 ◽  
Vol 73 (7) ◽  
pp. 1637-1643 ◽  
Author(s):  
Stefan Kroll ◽  
Geert Dirckx ◽  
Brecht M. R. Donckels ◽  
Mieke Van Dorpe ◽  
Marjoleine Weemaes ◽  
...  
Keyword(s):  
Real Time ◽  
Treatment Plant ◽  
Added Value ◽  
Minor Role ◽  
Real Time Control ◽  
Time Control ◽  
Spatial System ◽  
System Properties ◽  
Secondary Settling ◽  
A Minor

In order to comply with effluent standards, wastewater operators need to avoid hydraulic overloading of the wastewater treatment plant (WWTP), as this can result in the washout of activated sludge from secondary settling tanks. Hydraulic overloading can occur in a systematic way, for instance when sewer network connections are extended without increasing the WWTP's capacity accordingly. This study demonstrates the use of rule-based real-time control (RTC) to reduce the load to the WWTP while restricting the overall overflow volume of the sewer system to a minimum. Further, it shows the added value of RTC despite the limited availability of monitoring data and information on the catchment through a parsimonious simulation approach, using relocation of spatial system boundaries and creating required input data through reverse modelling. Focus was hereby on the accurate modelling of pump hydraulics and control. Finally, two different methods of global sensitivity analysis were employed to verify the influence of parameters of both the model and the implemented control algorithm. Both methods show the importance of good knowledge of the system properties, but that monitoring errors play a minor role.

The Analysis of Accounting Information Activities Blending SOA

2011 ◽  
Vol 267 ◽  
pp. 35-38
Author(s):  
Yan Fang Niu
Keyword(s):  
Knowledge Management ◽  
Real Time ◽  
Value Chain ◽  
Process Integration ◽  
Accounting Information ◽  
Added Value ◽  
Accurate Information ◽  
Real Time Control ◽  
Financial Reports ◽  
Time Control

Accounting value chain can be considered as composed by the five accounting information activities: capturing economic events, accounting business process integration, real-time financial reports, accounting real-time control, accounting information knowledge management. How to fully reflect the added-value of these activities is the key to produce the real-time, accurate information. This paper illustrates these accounting information activities blending the emerging SOA.

Real-Time Public Transport Operations: Library of Control Strategies

2017 ◽  
Vol 2647 (1) ◽  
pp. 26-32 ◽  
Author(s):  
Mahmood Mahmoodi Nesheli ◽  
Avishai (Avi) Ceder
Keyword(s):  
Real Time ◽  
Public Transport ◽  
Large Scale ◽  
Real Life ◽  
Small Scale ◽  
Control Procedure ◽  
Service Reliability ◽  
Real Time Control ◽  
Time Control ◽  
Control Actions

Modern public transport (PT) operations have evolved into a complex multimodal system in which small-scale disorder can propagate. Large-scale disruptions to passengers and PT agencies result. Various studies have been developed to model PT control at the operational level; however, the main downside of possible real-time control actions is the lack of intelligent modeling and a systematic process that can activate such actions immediately. This study presents a real-time control procedure to increase service reliability and to improve successful coordinated transfers in a complex PT system. The developed method aims at minimizing total travel time for passengers and reducing the uncertainty of meetings between PT vehicles. A library of operational tactics is first built to serve as a basis of the real-time decision-making process. The methodology developed is applied to a real-life case study in Auckland, New Zealand. The results showed improvements in system performance and confirmed the use of real-time control actions to maintain reliable PT service.

Petri nets based approach to software development for real-time control

1991 ◽  
Vol 138 (5) ◽  
pp. 474 ◽  
Author(s):  
P. Cofrancesco ◽  
A. Cristoforetti ◽  
R. Scattolini
Keyword(s):  
Software Development ◽  
Petri Nets ◽  
Real Time ◽  
Real Time Control ◽  
Time Control

Modeling and Simulation of Discrete Event Robotic Systems Using Extended Petri Nets

2012 ◽  
pp. 51-69
Author(s):  
Gen’ichi Yasuda
Keyword(s):  
Petri Nets ◽  
Real Time ◽  
Discrete Event ◽  
Control Flow ◽  
Coordination Mechanism ◽  
Robotic Systems ◽  
Real Time Control ◽  
Time Control ◽  
Extended Petri Nets ◽  
Implementation Problems

This chapter deals with modeling, simulation, and implementation problems encountered in robotic manufacturing control systems. Extended Petri nets are adopted as a prototyping tool for expressing real-time control of robotic systems and a systematic method based on hierarchical Petri nets is described for their direct implementation. A coordination mechanism is introduced to coordinate the event activities of the distributed machine controllers through friability tests of shared global transitions. The proposed prototyping method allows a direct coding of the inter-task cooperation by robots and intelligent machines from the conceptual Petri net specification, so that it increases the traceability and the understanding of the control flow of a parallel application specified by a net model. This approach can be integrated with off-the-shelf real-time executives. Control software using multithreaded programming is demonstrated to show the effectiveness of the proposed method.

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