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Optimizing maintenance costs/reliability of technical system using genetic algorithms

Optimizing maintenance costs/reliability of technical system...

引用

4th International Conference on Information technology for Manufacturing Systems, ITMS 2013

作者： Libošvárová, Adriána Schreiber, Peter Moravčík, Oliver Institute of Applied Informatics Automation and Mathematics Slovak University of Technology in Bratislava Paulínska 16 917 24 Trnava Slovakia

ISBN: (纸本)9783037858783

The main goal of the paper is to provide a drawn up methodic for proposal of technical system optimization in terms of maximizing its reliability at given sum of financial costs or minimizing finance to achieve set reliability. The system reliability, respectively causal relationships between system failures and its elements faults are analyzed and illustrated by using special method called fault tree analysis (FTA) and technical system is represented by fault trees. Subsequently, the genetic algorithms are appropriately applied on the constructed diagram. The part of this paper is the proposal and description of individual steps of genetic algorithm in order to optimize fault tree analysis. © (2013) Trans Tech Publications, Switzerland.

关键词： Genetic algorithms

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Optimal motion planning of spot welding robot applications

引用

2012 International Conference on Mechanical Materials and Manufacturing Engineering, ICMMME 2012

作者： Trnka, Kamil Bozek, Pavol Slovak University of Technology Faculty of Materials Science and Technology Institute of Applied Informatics Automation and Mathematics Hajdoczyho 1 917 24 Trnava Slovakia

ISBN: (纸本)9783037855560

This paper discusses the problem of effective motion planning for industrial robots. The first part dealt with current method for off-line motion planning. In the second part the presented work is done by one of the simulation systems with automatic trajectory generation and off-line programming capability. A spot welding process is involved. The practical application of this step strongly depends on the method for robot path optimization with high accuracy, thus transform the path into a time and energy optimal robot program for the real world, which is discussed in the third step. © (2013) Trans Tech Publications, Switzerland.

关键词： Motion planning

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Experiences with basic control course supported by matlab/simulink exercises

Experiences with basic control course supported by matlab/si...

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10th IFAC Symposium on Advances in Control Education, ACE 2013

作者： Kalave, Eniko Kósáné Bézi, István Bars, Ruth Institute of Physics University of Debrecen Debrecen Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary Department of Automation and Applied Informatics MTA-BME Control Engineering Research Group Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9783902823434

A basic control course is taught for electrical engineering students at the University of Debrecen, Hungary. Through two semesters the students get a basic knowledge on control concepts. Every week there are 2 hours of theoretical lectures immediately followed by 2 hours of MATLAB based interactive computer laboratories. In the curriculum besides the conventional material new aspects of control design such as Youla parametrization have also been included. Practical considerations as e.g. controller saturation are also dealt with. The paper reviews briefly the curriculum and the educational process of this program. © IFAC.

关键词： Curricula

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Steel billet continuous induction heating - Numerical model and advanced control

引用

2013 International Conference on applied Mechanics, Materials, and Manufacturing, AMMM 2013

作者： Kapusta, Juraj Camber, Juraj Hulkó, Gabriel Institute of Automation Measurement and Applied Informatics Slovak University of Technology Nám. Slobody 17 812 31 Bratislava Slovakia

ISBN: (纸本)9783037857953

Nowadays, the achievement of proper steel billets temperature profile is not the only design priority of induction heaters for hot forming applications. Due to its high operating costs, its design is constantly improving in terms of electrical and thermal efficiency. Therefore the more efficient multi-coil design starts to be more used in industrial practice. Numerical model of mentioned heater based on partial differential equations were solved by finite element method in virtual software environment. Primary goal of computer modeling was to investigate the thermal dynamics of four-module heater working in steady-state operation regime. Obtained data were applied to design an advanced control circuit based on distributed parameter systems theory. This may open up the opportunity to make further progress in induction heaters design. © (2013) Trans Tech Publications, Switzerland.

关键词： Design

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A Middleware Guaranteeing Client-Centric Consistency on Top of Eventually Consistent Datastores

A Middleware Guaranteeing Client-Centric Consistency on Top ...

引用

IEEE International Conference on Cloud Engineering (IC2E)

作者： David Bermbach Jörn Kuhlenkamp Bugra Derre Markus Klems Stefan Tai Institute of Applied Informatics (AIFB) Karlsruhe Institute of Technology Karlsruhe Germany

Applications often have consistency requirements beyond those guaranteed by the underlying eventually consistent storage system. In this work, we present an approach that guarantees monotonic read consistency and read your writes consistency by running a special middleware component on the same server as the application. We evaluate our approach using both simulation and real world experiments on Cloud storage systems.

关键词： Servers Libraries Vectors Clocks Cloud computing Electronic mail

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Adaptive model predictive vibration control with state and parameter estimation using extended kalman filtering

Adaptive model predictive vibration control with state and p...

引用

20th International Congress on Sound and Vibration 2013, ICSV 2013

作者： Takács, Gergely Polóni, Tomáš Rohal'-Ilkiv, Boris Slovak University of Technology in Bratislava Faculty of Mechanical Engineering Institute of Automation Measurement and Applied Informatics Nám Slobody 17 812 31 Bratislava Slovakia

ISBN: (纸本)9781629931500

This paper presents an adaptive-predictive vibration control system using extended Kalman filtering for the joint estimation of system states and model parameters. A fixed-free cantilever beam equipped with piezoceramic actuators is used to test the proposed control strategy. Deflection readings taken at the end of the beam are used to reconstruct position and velocity information for a second order state-space system. In addition to the system states, the dynamic model is augmented by the unknown model parameters: stiffness, damping constant and a voltage/force conversion constant;characterizing the actuating effect of the piezoceramic transducers. The states and parameters of this augmented system are estimated in real-time, using a continuous-discrete hybrid extended Kalman filter. The estimated model parameters are used to reconstruct the continuous state-space model of the vibrating system, which in turn is discretized for the predictive controller. The model predictive control algorithm generates state predictions and infinite-horizon quadratic cost prediction matrices based on the updated discrete state-space models. The resulting cost function is then minimized using quadratic programming to find the sequence of optimal but constrained control inputs, from which only the first is utilized in a form of a control voltage send to the piezo actuators, the rest is discarded and the procedure is repeated at the next sampling instant. The proposed active vibration control system is implemented and evaluated experimentally to validate the viability of the control method.

关键词： Model predictive control

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A Configuration Crawler for Virtual Appliances in Compute Clouds

A Configuration Crawler for Virtual Appliances in Compute Cl...

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IEEE International Conference on Cloud Engineering (IC2E)

作者： Michael Menzel Markus Klems Hoàng Anh Lê Stefan Tai Institute for Applied Informatics and Formal Description Methods (AIFB) Karlsruhe Institute of Technology Karlsruhe Germany

Compute clouds are pools of virtual machines that are shared in a multi-tenant environment by multiple users. The virtual machine images are stored in one or more repositories and are pre-configured with an operating system. Users of the compute cloud can upload their own images or install and configure additional software on top of existing basic virtual machines. Today, the Amazon Elastic Compute Cloud (EC2) counts more than 35,000 publicly available virtual machine images. We observe, however, that the meta-data that describes the virtual machine images is of poor quality and does not cover vital information such as operating system configurations or software package installations. The sprawl of poorly documented virtual machine images poses a hurdle to sharing and re-use among members of the compute cloud community. We present a method that allows collecting software-related meta-data in compute clouds through appliance introspection. Moreover, we show how applications in the domains of selection and configuration management benefit from rich meta-data and interact with the method. The method has been implemented as an automated tool, the crawler, that collects configuration data of virtual machine images in public compute clouds and evaluated our approach by crawling Amazon EC2.

关键词： Virtual machining Crawlers Home appliances Operating systems Databases Data models

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New possibilities of industrial programming software

New possibilities of industrial programming software

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2013 International Conference on Process Control, PC 2013

作者： Seman, Pavol Juhas, Martin Tkac, Lukas Honek, Marek Institute of Automation Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology in Bratislava Nám. Slobody 17 812 31 Bratislava Slovakia

ISBN: (纸本)9781479909278

Recent developments in the area of industrial programing software expand the potential of the automation programs considerably. In addition to IEC 61131-3 languages, programming languages like C and C++ are getting available for industrial controllers, which opens new possibilities of reusing existing programs for real time processing in these controllers. Paper deals with swing-up and online model predictive control of mechatronic device - reaction wheel inverted pendulum. Swing-up control uses convenient shape of exponential function over pendulum position for determination of required energy to be delivered to the system. For stabilization of pendulum in the upright position a predictive controller based on optimal control law with perturbation was used. An important part of the solution is PLC implementation of qpOASES package for numerical solution of quadratic optimization problem. Application is implemented and tested using industrial PLC connected to a laboratory pendulum. © 2013 IEEE.

关键词： Exponential functions

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Nonlinear Air-Fuel Ratio Predictive Control of Spark Ignited Engines

Nonlinear Air-Fuel Ratio Predictive Control of Spark Ignited...

引用

International Conference on Process Control

作者： Slawomir Wojnar Marek Honek Boris Rohal'-Ilkiv Institute of Automation Measurement and Applied Informatics Slovak University of Technology

ISBN: (纸本)9781479909261

The aim of this paper is to present a nonlinear model-based predictive control (NMPC) for air-fuel ratio (AFR) of spark ignited (SI) engines. Complexity of NMPC implementation causes that the computational requirements on storage space and online computation time have to be considered in the controller design. Especially a limitation on computation time makes often the optimal control law too complex to be implemented and some suboptimal solution has to be provided to meet the requirements. The point of the paper is to present the controller which utilizes the simplified control problem in a warm-start technique and allows to decrease the online computational effort caused by the nonlinear predictive controller.

关键词： computational time Air fuel ratio fuel ratio Ignition Predictive controllers Engines storage spaces Controllers Predictive control nonlinearity On-Site Inspections Silicon International System of Units

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Social BPM Lab -- Characterization of a Collaborative Approach for Business Process Management Education

Social BPM Lab -- Characterization of a Collaborative Approa...

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IEEE Conference on Commerce and Enterprise Computing, CEC

作者： Timm Caporale Murat Citak Jonas Lehner Andreas Schoknecht Meike Ullrich Institute of Applied Informatics and Formal Description Methods (AIFB) Karlsruhe Insitute of Technology Karlsruhe Germany

Business Process Management (BPM) is an important tool for companies to cope with today's competitive market situation. One current mean to gain a competitive edge is through integrating social networks and software into BPM. But though knowledge and skills in this particular area are highly demanded by enterprises there is still a lack of sufficient teaching concepts. Universities typically only offer functional courses without considering the communication and social aspects of BPM. This paper describes a single course unit for BPM at universities disseminating not only theoretical knowledge but also practical application and communication skills. Additionally, problem-based learning and role play simulation have been identified as pedagogical foundations. This Social BPM Lab is based on the Horus Method which comprises relevant aspects of Business Process Management and fosters interactions between students through social media in a lab context. First evaluations show that the lab increases students' involvement and understanding of the connections between BPM theory and practice.

关键词： Educational institutions Collaboration Internet Software Companies

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