Program of section Engineering application

Lectures

RefNr: 68 (Review state=accepted_lecture)

László LENGYEL, Tihamér LEVENDOVSZKY and Hassan CHARAF:
MANAGING CROSSCUTTING CONSTRAINTS IN METAMODEL-BASED MODEL TRANSFORMATION FRAMEWORKS
Presenters: Lengyel, László
Abstract

Model transformation has become one of the most focused research field, it is vital in several applications such as Model-Driven Architecture standardized by OMG. Model transformation means converting an input model available at the beginning of the transformation process to an output model. A widely used approach to model transformation uses graph rewriting as the underlying transformation technique. Graph rewriting, however deals with the topological aspects of the transformation, the attribute-related constraints must be specified otherwise. To define precisely the transformation steps beyond the topology of the visual models additional constraints must be specified, which ensures the correctness of the attributes, or other properties to be enforced. Dealing with OCL constraints provides a solution for the unsolved issues, because these problems can be addressed by constraint validation, but topological and attribute transformation methods cannot perform and express these kinds of model properties. OCL as the part of the UML standard has been successfully applied in various problem domains. The use of OCL as a constraint and query language in modeling and model transformation is essential. This paper presents the problem of the crosscutting constraints in graph transformation steps and provides an aspect-oriented solution for it.

RefNr: 115 (Review state=accepted_lecture)

Elena Serban:
APPLICATION OF SLIDING MODE CONTROL IN TRAJECTORY TRACKING OF AN ELECTROHYDRAULIC SYSTEM DRIVING A SHAKING TABLE
Presenters: Serban, Elena
Abstract

This paper presents a sliding mode control technique applied to 150 KN shaking table electrohydraulic servo control system from Building Research Institute for Seismic and Hygrothermic Engineering INCERC Iasi, Romania. The paper presents a mathematical model with parameter uncertainty and a control law that makes the system invariant to parametric uncertainty and external perturbation. Some simulation results are given for tracking a desired trajectory.

RefNr: 135 (Review state=accepted_lecture)

Bogdan SAPIŃSKI:
EXPERIMENTAL SEMI-ACTIVE CONTROL SYSTEM FOR A DRIVER?S SEAT SUSPENSION WITH A MR DAMPER
Presenters: Sapinski, Bogdan
Abstract

The paper provides a description of the experimental control system for a driver?s seat suspension de-veloped as a part of the author?s research programme. The main purpose was to improve the driver?s safety and comfort during the ride though automatic adjustment to both the driver?s body weight and variable levels of shock and ground-induced vibrations. The system consists of a duly engineered magnetorheological (MR) damper, real-time controllers (utilising on-off and fuzzy logic control) implemented in the integrated design of control environment of MATLAB/Simulink and a fabricated current driver for supplying the damper coil. The paper summarizes the structure and testing procedures of the system?s main components, the results of labora-tory tests performed so far and reveals certain technical problems to be addressed in further research.

RefNr: 149 (Review state=accepted_lecture)

Martin Čech and Milo? Schlegel:
FRACTIONAL ORDER POLE MODELS FOR ROBUST CONTROL ON INTERNET: www.PIDlab.com
Presenters: Cech, Martin
Abstract

This paper describes the simple Internet tool for fractional order pole models - the Java applet free accessible on www.PIDlab.com. The applet implements procedures described in the authors? previous works, where the value set approach to fractional order pole systems was presented for the case, when following characteristic numbers of the process were obtained: a) one sample of the process frequency response, b) first three moments of the process impulse response. Using the applet, we can easily compute value sets and find the upper hard bound of the value sets for the case, when one/two frequency response samples and first three moments of the impulse response are known simultaneously. Then we can determine processes on the value set boundary which will be further important for robust controller design.

RefNr: 161 (Review state=accepted_lecture)

Milos Seda:
Geometric Structures for Solving Network Optimisation Problems
Presenters: None.
Abstract

This paper deals with fundamental structures of computational geometry, the Voronoi diagram, and its geometric dual, the Delaunay triangulation. They arise naturally in various branches of science. This paper surveys their basic properties and possible use for solving selected network optimisation problems.

RefNr: 178 (Review state=accepted_lecture)

Kalinski Krzysztof:
THE SPINDLE SPEED CONTROL FOR HIGH SPEED MILLING VIBRATION SURVEILLANCE
Presenters: Kalinski, Krzysztof
Abstract

The paper is devoted to new approach towards vibration surveillance of rotating tools in modern milling machines. The approach relates to the machine tool closed?loop systems, in case of which the problem of self?excited chatter vibration is of a great importance. Although chatter vibration deteriorates machined surface drastically and causes intensive tool wear, only few elaboration express relationships between vibration level and accuracy and tool life. A lack of approaches towards tool?workpiece surveillance at high speed cutting is observed as well. A new attempt towards tool?workpiece vibration surveillance, which is based upon the optimal control of discrete unsteady systems at energy performance index, is free off disadvantages related to previous step?changing spindle speed control. Thus, dynamics of controlled structure is described while suitable discrete model has been obtained by the finite element method. Subsequently, dynamic equation of the system is transformed such that relevant open?loop representation is obtained. As result, in order to reduce vibration level, instantaneous change in the spindle speed appears as control command. Here a high speed ball end milling process by a slender tool is a subject of consideration. High speed machines Mikron VCP 600 and Deckel Maho DMU 50eVolution have been chosen as objects of the performance. The cutting using slender ball?end mills is applied very frequently in case of contemporary production centres. A technological reason lies in necessity of accurate making of perfect geometric configurations, such as moulds and dies, crankcases, rotors and difficulty accessible hobbings. The products above play important role in food processing, as well as machinery, automotive and aerospace industry. The process is also characterised by changing in time cutting geometry. Due to a level of the product technology and high costs of finishing operations, it is required the milling being fine. Thanks to world tendencies of raising cutting speed up to 1000 m/min and feed speed up to 100 m/min, high productivity of machining at much low allowance is possible to be obtained. The latter is also important due to reduction of cutting forces. Coolants are almost eliminated off the process, so that dry cutting is extremely ecological. There are explained a lot of sets of computer simulation results. They refer to various programs of the spindle speed change. Some of them have been verified by experiments. All these cases evidenced practical meaning of the method proposed, because the changing spindle speed programme is really possible to be performed, and chatter vibration has been successfully reduced.

RefNr: 185 (Review state=accepted_lecture)

Romulus Terebes, Monica Borda, Olivier Lavialle, Pierre Baylou, Sorin Pop, Tihamer Adam:
Linear Flow Coherence Diffusion
Presenters: Terebes, Romulus
Abstract

The article proposes a novel diffusion filter for image filtering and enhancement. The method is dedicated for processing images containing structures with a strong directional tendency. The filter is based on a linear PDE approach and uses principles of tensor driven diffusion. Compared to other existent methods our approach exhibits enhanced precision in restoring junctions, provides local contrast independent filtering and low computational complexity.

RefNr: 215 (Review state=accepted_lecture)

Erno Kovacs-Csaba Blaga-Gabor Torok:
3D linear robot control in LabVIEW environment
Presenters: Kovács, Ern?
Abstract

RefNr: 221 (Review state=accepted_lecture)

KLAUS Rafał:
Motion modeling of turntable for pouring moulds with polyurethane foam
Presenters: Rafał, Klaus
Abstract

Obtaining high quality polyurethane foam casts, especially in motorization, forces producers to use automated manufacturing processes. In the paper, a construction of automated stand for pouring polyurethane foam into moulds is presented. Also basic tasks for steering software, algorithms of building a system model, are described.

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