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6th International Conference on Industrial Applications of Holonic and Multi-Agent Systems, HoloMAS 2013

作者： Morariu, Cristina Morariu, Octavian Borangiu, Theodor University Politehnica of Bucharest Dept. of Automation and Applied Informatics Bucharest 060042 Romania

ISBN: (纸本)9783642400896

Shop-floor scheduling is one of the most complex problems in holonic manufacturing systems as it deals with unpredictable scenarios and overlapping requirements. The scheduling problem is considered to be a NP-hard problem and only near optimal solutions can be obtained. A solution for this problem can be formulated only by employing meta-heuristic class algorithm. This paper discusses the scheduling problem in heterachical operating mode, focusing on solving the local horizon problem. A distributed genetic algorithm is introduced, that uses the local operation plan to generate the initial solution population. The initial population is then evolved based on global optimum soft conditions until the acceptable solution fitness is achieved. The soft conditions considered at global horizon layer are energy footprint, resource utilization and supply chain optimization for resource stocks. The paper describes the data structures used to model this logic and describes in detail the genetic algorithm evolution mechanism. Experimental results are discussed in the context of a pilot production line consisting of six universal resources and a conveyor belt processing two parallel customer orders. © 2013 Springer-Verlag.

关键词： Scheduling

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Employing 2DoF PID Controllers to Improve Greenhouse Climate System Robustness

Employing 2DoF PID Controllers to Improve Greenhouse Climate...

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IEEE International Conference on System Science and Engineering

作者： Eugen Horatiu Gurban Gheorghe-Daniel Andreescu "Politehnica" University of Timisoara Dept. of Automation and Applied Informatics

ISBN: (纸本)9781479900084

The mathematical models of the greenhouse environment are MIMO systems, characterized by a high coupling, nonlinearity, parameter variation and they are highly influenced by disturbances. This paper uses a well-known greenhouse climate model with measurable external disturbances and a feedback-feedforward linearization, decoupling and disturbance compensations technique. Greenhouse climate model parameters/disturbances, which are susceptible to wrong estimation, are identified, i.e., heat transfer coefficient (UA), shading and leaf area index coefficient (a), and intercepted solar radiant energy (Si). The system response, in the case of nominal model and considering different levels of model uncertainty, are compared. Significant quality indicator degradations for setpoint step responses leads to reconsider the control structure using two degree of freedom (2DoF) PID controllers. Four 2DoF PI/PID tuning technique are compared at nominal condition and under parameter variations showing good performance.

关键词： model uncertainty Control Architecture Proportional Integral Derivative Control nominal condition greenhouses parameter variation system response two degrees of freedom multiple input multiple output systems Climate Mathematical Model

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Formalized information representation for intelligent products in service-oriented manufacturing

Formalized information representation for intelligent produc...

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11th IFAC Workshop on Intelligent Manufacturing Systems, IMS 2013

作者： Morariu, Cristina Morariu, Octavian Borangiu, Theodor Sallez, Yves Dept. of Automation and Applied Informatics University Politehnica Bucharest Romania University of Valenciennes TEMPO Research Lab. Le Mont Houy 59313 Valenciennes cedex France

ISBN: (纸本)9783902823335

The Intelligent Product concept has been proposed almost a decade ago, gaining considerable traction in manufacturing enterprises as it helps aligning the information flow with the material flow even in the simplest implementations. In advanced applications it can provide support for executing complex algorithms allowing local decision making upon collective reasoning or individual and autonomous selection of the manufacturing operations. In the context of service-oriented manufacturing systems there are new requirements for intelligent products, such as standards adoption and SOA capabilities. This paper proposes a classification of intelligent products from a SOA integration point of view and introduces a formalized data structure for intelligent products in the form of a XSD schema for XML representation. The data flow during manufacturing is discussed in the context of lead time and lag time between operations in the product recipe with the goal to enable ETA estimation of the product and the product batch. An example is presented for assembly of an Hshaped product, focusing on representation of operation dependencies and lag time in XML format proposed. © 2013 IFAC.

关键词： Data structures

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Integrated starter-alternator control system for automotive

Integrated starter-alternator control system for automotive

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International Symposium on Computational Intelligence and informatics

作者： Gheorghe-Daniel Andreescu Cristina-Elena Coman Dept. of Automation and Applied Informatics “Politehnica” University of Timisoara Romania

This paper develops a control system for an Integrated Starter Alternator (ISA) used in hybrid electric vehicles. ISA employs a permanent magnet synchronous machine with voltage source inverter, using field oriented vector control with torque reference. The motor / generator mode is given by the torque reference selecting with a switch an external torque (for motor mode) or a torque delivered by a dc voltage loop to charge the battery (for generator mode). The internal combustion engine is simulated by a DC motor with speed control, and the battery is managed by using the ISA active power. The simulation results, based on real scenarios, prove the ability of the proposed ISA control system to work in motor and generator modes with smooth transition between them. The scenarios include the motor mode with starting and added demanded mechanical torque, and the generator mode to charge the battery up to 42 V, with good dynamic responses.

关键词： Torque DC motors Generators Ice Batteries Control systems Permanent magnet motors

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Core line detector of a multi purpose geometry scanner

Core line detector of a multi purpose geometry scanner

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International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Tibor Kovács Gergely Mezei Dept. of Automation and Applied Informatics Budapest University of Tech. and Economics Budapest Hungary

In cognitive informatics, attention is drawn to create, model, analyze and interact with three-dimensional representation of the objects from the environment. Having a precise 3D scanner solution for an affordable price is an important step to achieve this goal. Our research group focuses on creating such a solution consisting of a scanner device and a software component. As part of the research, a cost effective active triangulation laser scanner hardware is built. Currently we focus on developing a high-precision line tracking method based on software solution instead of using expensive hardware components. More precisely, at the moment, a noise model is set to describe the noise of the imaging system, and it is to be integrated into the triangulation core engine. As the part of this research, a new and accurate algorithm is defined to find the initial point of line tracking. The paper presents an overview of the scanner environment and a detailed discussion is given on the new algorithm. Besides the details of the algorithm, measurements are also presented and a comparison is drawn between our approach and existing algorithms.

关键词： Noise Three-dimensional displays Detectors Solid modeling Accuracy Hardware Light sources

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A method of machine code translation to intermediate representation

A method of machine code translation to intermediate represe...

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International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Dmitriy Dunaev Hassan Charaf László Lengyel Dept. of Automation and Applied Informatics Budapest University of Technology and Economics (BME) Budapest Hungary

Translation of machine code to intermediate representation is an essential part of a platform-independent obfuscator that deals with intermediate code. The paper discusses a method of assembly code analysis and its translation to three-address code. The focus is set on basic block splitting, alias analysis, value-sets analysis, and interprocedural analysis. The presented techniques are universal, and can be used apart from an obfuscator tool.

关键词： Registers Assembly Algorithm design and analysis Abstracts Optimization Data structures Software

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Formalized Information Representation for Intelligent Products in Service-Oriented Manufacturing

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IFAC Proceedings Volumes 2013年第7期46卷 318-323页

作者： Cristina Morariu Octavian Morariu Theodor Borangiu Yves Sallez Dept. of Automation and Applied Informatics University Politehnica Bucharest Romania University of Valenciennes TEMPO Research Lab. Le Mont Houy -59313 Valenciennes Cedex France

The Intelligent Product concept has been proposed almost a decade ago, gaining considerable traction in manufacturing enterprises as it helps aligning the information flow with the material flow even in the simplest implementations. In advanced applications it can provide support for executing complex algorithms allowing local decision making upon collective reasoning or individual and autonomous selection of the manufacturing operations. In the context of service-oriented manufacturing systems there are new requirements for intelligent products, such as standards adoption and SOA capabilities. This paper proposes a classification of intelligent products from a SOA integration point of view and introduces a formalized data structure for intelligent products in the form of a XSD schema for XML representation. The data flow during manufacturing is discussed in the context of lead time and lag time between operations in the product recipe with the goal to enable ETA estimation of the product and the product batch. An example is presented for assembly of an H- shaped product, focusing on representation of operation dependencies and lag time in XML format proposed.

关键词： Intelligent Product SOA XML data structure XSD schema information flow

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Improved delay-range-dependent stability analysis of a T-S Fuzzy system with time varying delay

Improved delay-range-dependent stability analysis of a T-S F...

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International Symposium on Computational Intelligence and informatics

作者： Rajeeb Dey Valentina. E. Balas T.C. Lin G. Ray Dept. of Electronics and Communication Engineering Sikkim Manipal University Sikkim India Dept. of Automation & Applied Informatics Aurel Vlaicu University of Arad Romania Dept. of Electronic Engineering Feng Chia University Taiwan

This paper presents a new & improved stability analysis for Takagi-Sugeno (T-S) Fuzzy system subjected to interval time-varying delay. The stability analysis provides a sufficient stability condition in an Linear Matrix Inequality (LMI) frame work that can estimate less conservative delay upper bound for a given lower bound of delay. The analysis is carried out by proposing new and modified Lyapunov-Krasovskii (L-K) functional along with the judicious use of Jensen's integral for eliminating the integral terms arising out from the time derivative of L-K functional, these modifications in turn leads to convex combination of the LMIs. Few numerical examples are included to illustrate the effectiveness of the obtained stability condition compared to some recently published stability conditions for different delay nature while delay is varying in intervals.

关键词： Delays Stability analysis Fuzzy systems Upper bound Symmetric matrices Time-varying systems Numerical stability

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Cost analysis for service-oriented holonic manufacturing system design

Cost analysis for service-oriented holonic manufacturing sys...

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14th IFAC Symposium on Information Control Problems in Manufacturing, INCOM'12

作者： Morariu, Cristina Morariu, Octavian Borangiu, Theodor University Politehnica of Bucharest Dept. of Automation and Applied Informatics Romania

ISBN: (纸本)9783902661982

This paper presents a formal methodology to perform a cost analysis for the customer order management (COM) process in the context of holonic manufacturing systems. The business process described in the paper, centred on COM, interconnects reference architecture with several enhancements that help in the mapping of the financial relevant activities. The process is analysed from two perspectives, first to show how the resource break-down rate in the HMES influences the overall profit and secondly to show the relationship between the percentage of products that fail the quality assurance test and the overall profit. The process was simulated using a BPM tool and the results are discussed. © 2012 IFAC.

关键词： Profitability

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Customer order management in service oriented holonic manufacturing

Customer order management in service oriented holonic manufa...

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14th IFAC Symposium on Information Control Problems in Manufacturing, INCOM'12

作者： Morariu, Cristina Morariu, Octavian Borangiu, Theodor University Politehnica of Bucharest Dept. of Automation and Applied Informatics Romania

ISBN: (纸本)9783902661982

One of the most important problems when considering the design of manufacturing systems based on SOA paradigms is the integration of shop floor activities in the business processes at enterprise level. This paper presents the design and implementation of a web service abstraction layer for holonic manufacturing systems that allow business process orchestration of customer order management module. It focuses on enhancements implemented for the NetLogo tool by adding both incoming and outgoing Web Services capabilities and discusses the technical solutions for this integration. An example is being provided for the integration and testing of a business process against the considered environment. © 2012 IFAC.

关键词： Web services

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