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Papers by Tiberiu Vesselenyi

Journal of Low Frequency Noise, Vibration and Active Control, 2019

An unbalanced propeller can affect a quadcopter’s performance due to vibration, also decreasing i... more An unbalanced propeller can affect a quadcopter’s performance due to vibration, also decreasing its thrust’s yield. Analyses were conducted to determine the correlation between vibration in the dynamic movement of a balanced and an imbalanced propeller using a laser vibrometer (portable digital vibrometer) PDV-100, to determine the correlation between propeller rotational speed and its vibration, as well as to determine the propeller’s maximum rotational speed to avoid over-vibration. The vibration analysis was conducted on a carbon fiber 2-blade propeller by comparing the results of vibration tests with the propeller blade contour. The vibration response of the propeller has been analyzed at three points, respectively the hub, the center, and the tip of the blade, to determine the point having the largest value of the vibration on the propeller running at a maximum rotation speed of 7000 rpm. The same analysis was made on two propellers: the first one of type 1340 with a diameter o...

ANNALS OF THE ORADEA UNIVERSITY. Fascicle of Management and Technological Engineering.

Procedia Computer Science

Bulletin of the Belgian Mathematical Society - Simon Stevin

We present a topological classification of some trichotomic evolution families, in the sense of S... more We present a topological classification of some trichotomic evolution families, in the sense of Sacker-Sell, Elaydi-Hajek, and the one introduced in ([7]). We hope our work will contribute to the general theory of exponential dichotomies and trichotomies.

Symmetry

Flexibility of manufacturing systems is an essential factor in maintaining the competitiveness of... more Flexibility of manufacturing systems is an essential factor in maintaining the competitiveness of industrial production. Flexibility can be defined in several ways and according to several factors, but in order to obtain adequate results in implementing a flexible manufacturing system able to compete on the market, a high level of autonomy (free of human intervention) of the manufacturing system must be achieved. There are many factors that can disturb the production process and reduce the autonomy of the system, because of the need of human intervention to overcome these disturbances. One of these factors is tool wear. The aim of this paper is to present an experimental study on the possibility to determine the state of tool wear in a flexible manufacturing cell environment, using image acquisition and processing methods.

CONAT 2016 International Congress of Automotive and Transport Engineering, 2016

ANNALS OF THE ORADEA UNIVERSITY. Fascicle of Management and Technological Engineering., 2011

ANNALS OF THE ORADEA UNIVERSITY. Fascicle of Management and Technological Engineering., 2013

ANNALS OF THE ORADEA UNIVERSITY. Fascicle of Management and Technological Engineering., 2015

Applied Mechanics and Materials, 2015

Precision of the machining centers is influenced by many factors among which are mechanical vibra... more Precision of the machining centers is influenced by many factors among which are mechanical vibrations that occur in the machine-tool-part-device system. Evaluation of vibration level for five axes machining centers is a very important issue considering structural and functional complexity of these equipments. The paper presents researches performed at University of Oradea to evaluate vibration of TMA-AL 550 five axes machining center, equipped with a two rotating axes table, during the machining process. There have been used two methods: evaluation of the dynamic behavior of the spindle using a laser vibrometer and evaluation of mechanical vibrations of the five axes machining center using triaxial accelerometers. Measurement data had been processed using spectral analysis and time-frequency parameters, revealing frequency domains which can cause high amplitudes of vibration. Results also show that the measured vibration levels are not exceeding the accepted limits.

Computation and simulation of the Lorentz force of the magnetic field between two linear conducto... more Computation and simulation of the Lorentz force of the magnetic field between two linear conductors of circular section are presented. The model is constructed in MATLAB, using the finite element method.

Camera calibration has always been an essential component of the robot vision systems, with selfc... more Camera calibration has always been an essential component of the robot vision systems, with selfcalibration nowadays being an integral and routinely applied operation within photogrammetric triangulation, especially in high-accuracy close-range measurement. With the very rapid growth in adoption of off-the-shelf digital cameras for a host of new 3D measurement applications, however, there are many situations where the geometry of the image network will not support robust recovery of camera parameters via on-the-job calibration. For this reason, stand-alone camera calibration has again emerged as an important issue, and it also remains a topic of research interest in computer vision. This paper overview the current approaches adopted for camera calibration in computer vision. Also, the author's results of camera calibrations are summarized.

Technological Developments in Education and Automation, 2009

This paper presents the possibilities of using the augmented reality to control a robot system vi... more This paper presents the possibilities of using the augmented reality to control a robot system via Internet.

2009 3rd International Workshop on Soft Computing Applications, 2009

Cellular automata (CA) are used to simulate a various number of complex processes, based on simpl... more Cellular automata (CA) are used to simulate a various number of complex processes, based on simple rules applied to a large population of cells. Wear of turbine blades is also a very complex process which is analyzed in most cases using empirical data. The model described in this paper uses cellular automata obeying a set of rules and using values of initial state parameters which were computed by FEA flow analysis (fluid pressure and velocity). The model is then adjusted using experimental data. The obtained results, corresponds to former studies and observations. Further developments can be made by alternatively applying FEA analysis and CA simulation in order to increase model accuracy.

Innovations and Advanced Techniques in Computer and Information Sciences and Engineering, 2007

ABSTRACT This paper presents some studies regarding the functional model of a robot system that h... more ABSTRACT This paper presents some studies regarding the functional model of a robot system that has a visual servoing control, and also the simulation results for the system model. The information given by a visual system of the position of a target, materialized by a moving light source is used to realize the robot control.

Mechanisms and Machine Science, 2013

Volume 3: Advanced Composite Materials and Processing; Robotics; Information Management and PLM; Design Engineering, 2012

ABSTRACT Experimentation is a very important part of education in engineering including mechatron... more ABSTRACT Experimentation is a very important part of education in engineering including mechatronics engineering, which is a relatively new field, combining three engineering disciplines: mechanical engineering, electrical engineering and software engineering. The equipments needed for experiments in mechatronics are usually expensive. A solution to make these expensive equipments achievable is to share them with other universities or research centers from different locations in the world.The goal of our team is to build a networked telerobot system so that the Internet users, especially researchers and students, can be able to control an autonomous robot able to explore a dynamic environment remotely from their home and share the robot system with the department. The particularity of the environment, in this case, is that the experiment uses grid lines painted on the floor, for robot navigation purpose.The system which is still under development will be able to increase the number of robots. The communication software technologies are based on PHP. A specific protocol over IP was designed for communication between the server and clients.The aim of this project is oriented toward providing a telerobot system with a high degree of local intelligence in order to overcome restricted bandwidth and transmission delay of the network.

Transport optimization is in the focus of many studies, which aim at cost minimization, maximizat... more Transport optimization is in the focus of many studies, which aim at cost minimization, maximization of transported cargos, minimization of delivery time. Although there are many internet-based systems, which facilitate transport service searching, very few of them are integrating transport optimization algorithms. Our study presents some solutions regarding transport optimization based on clustering of transport service providers and clients using fuzzy and neural methods. These algorithms are meant to be implemented in an internet-based system, which can be used by both clients and transporters in order to maximize their profits.