Roland SZABO

Dr. Roland SZABO

Applied Electronics Department, Politehnica University Timișoara, Timişoara, Timiş, Romania
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Academic Career Length

18Years (2009-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 November 2012
Verified
Conference Paper
Closed access
RSRoland SZABO
Roland SZABO
ILIoan Lie
Ioan Lie
This paper presents an application to sort colored objects with a robotic arm. We have a robotic arm which picks different colored cubes and sorts them placing in different cups. The color recognition is made using image recognition with a webcam. The robotic arms are widely used in the industry, but most of them are used in a PTP (Point To Point) trajectory, the moves are learned previously by the robotic arm. Very few robots in the industry are programmed to be smart, or to make decisions. In the future to completely replace the humans with robots, we need robotic arms which can make decisions. One good example for a smart robotic arm can be a robotic arm which can sort objects by color. This can be used in many factories; one good example can be a pencil factory.
24 April 2018 in Applied Sciences
Verified
Journal Article
Open access
PDF file
RSRoland SZABO
Roland SZABO
AGAurel GONTEAN
Aurel GONTEAN
The aim of this work was to introduce new ways to model the I-V characteristic of a photovoltaic (PV) cell or PV module using straight lines and Bézier curves. This is a complete novel approach, Bézier curves being previously used mainly for computer graphics. The I-V characteristic is divided into three sections, modeled with lines and a quadratic Bézier curve in the first case and with three cubic Bézier curves in the second case. The result proves to be accurate and relies on the fundamental points usually present in the PV cell datasheets: V o c (the open circuit voltage), I s c (the short circuit current), V m p (the maximum power corresponding voltage) and I m p (the maximum power corresponding current), and the parasitic resistances R s h 0 (shunt resistance at I s c ) and R s 0 (series resistance at V o c ). The proposed algorithm completely defines all the implied control points and the error is analyzed. The temperature and irradiance influence is also analyzed. The model is also compared using the least squares fitting method. The final validation shows how to use Bézier cubic curves to accurately represent the I-V curves of an extensive range of PV cells and arrays.
1 November 2013
Verified
Conference Paper
Closed access
RSRoland SZABO
Roland SZABO
AGAurel GONTEAN
Aurel GONTEAN
This paper presents a method how to control a robotic arm in 3D space using only a pair of stereo cameras. The robotic arm has 3 degrees of freedom which means we have to control very precisely 3 motors. These motors will be controlled exactly as much is needed to reach the desired object. The robotic arm is detected in the 3D space with some colored spots. At the end of the gripper a 3D coordinate system is made, which helps to calculate how much movement is needed by each of the motors to reach the desired object.
24 December 2017 in Energies
Verified
Journal Article
Open access
PDF file
AGAurel GONTEAN
Aurel GONTEAN
Septimiu LicaSeptimiu Lica
Septimiu Lica
SBSzilard Bularka
Szilard Bularka
RSRoland SZABO
Roland SZABO
Dan Florentin LascuDan Florentin Lascu
Dan Florentin Lascu
This paper proposes a novel model for a PV cell with parameters variance dependency on temperature and irradiance included. The model relies on commercial available data, calculates the cell parameters for standard conditions and then extrapolates them for the whole operating range. An up-to-date review of the PV modeling is also included with series and parallel parasitic resistance values and dependencies discussed. The parameters variance is analyzed and included in the proposed PV model, where the self-heating phenomenon is also considered. Each parameter variance is compared to the results from different authors. The model includes only standard components and can be run on any SPICE-based simulator. Unlike other approaches that consider the internal temperature as a parameter, our proposal relies on air temperature as an input and computes the actual internal temperature accordingly. Finally, the model is validated via experiments and comparisons to similar approaches are provided.
1 November 2013
Verified
Conference Paper
Closed access
RSRoland SZABO
Roland SZABO
AGAurel GONTEAN
Aurel GONTEAN
In this paper we shall show a method how to command a Lynxmotion AL5 type robotic arm. The robotic arm has 5 servomotors and can be extended with an extra servo motor to rotate the gripper. The robotic arm has an SSC-32 control board, which can control all the motors. The control board has an ATmega168 microcontroller which commanded on RS-232 interface with a PC will control the motors. The microcontroller can receive specific SCPI commands which can be interpreted and can control the motors this way moving the robotic arm.
1 July 2013
Verified
Conference Paper
Closed access
RSRoland SZABO
Roland SZABO
AGAurel GONTEAN
Aurel GONTEAN
This paper presents all the steps involved in the development of a new and friendly programming language for the AL5 type robotic arm. The AL5 can be controlled via the RS-232 serial port using SCPI (Standard Commands for Programmable Instruments) commands, but this method can control one motor at a time. The robotic arm has 5 + 1 motors; the last motor is an optional motor used to rotate the gripper. Motor sequential control is not the best option, so a method is necessary. Our idea was to teach the robotic arm by moving it in a PTP (Point to Point) path. While moving the motor, positions are saved in text file; afterwards an application can read those text files moving the robot autonomously in the desired path.