István Vajk

ORCID: 0000-0002-2818-9162
Publications
Citations
Views
---
Saved
---
About
Contact & Profiles
Research Areas
  • Control Systems and Identification
  • Advanced Control Systems Optimization
  • Fault Detection and Control Systems
  • Robotic Path Planning Algorithms
  • Neural Networks and Applications
  • Robotic Mechanisms and Dynamics
  • Data Mining Algorithms and Applications
  • Real-time simulation and control systems
  • Image and Object Detection Techniques
  • Vehicle Dynamics and Control Systems
  • Web Data Mining and Analysis
  • Sensor Technology and Measurement Systems
  • Blind Source Separation Techniques
  • Music and Audio Processing
  • Structural Health Monitoring Techniques
  • Text and Document Classification Technologies
  • Speech and Audio Processing
  • Control and Dynamics of Mobile Robots
  • Rough Sets and Fuzzy Logic
  • Formal Methods in Verification
  • Caching and Content Delivery
  • Multilevel Inverters and Converters
  • Algorithms and Data Compression
  • Advanced Control Systems Design
  • Image and Signal Denoising Methods

Budapest University of Technology and Economics
2014-2024

Institute of Automation
2016

Andrássy University Budapest
2003-2010

Montavid Thermodynamic Research Group
2004

Budapest Institute
1982-2000

Eötvös Loránd University
1981-1999

In this paper, we consider the speed planning problem for a robotic manipulator. particular, present an algorithm finding time-optimal law along assigned path that satisfies velocity and acceleration constraints respects maximum forces torques allowed by actuators. The addressed optimization is finite-dimensional reformulation of continuous-time problem, obtained discretizing profile with n points. proposed has linear complexity respect to number degrees freedom. Such best possible problem....

10.1109/tro.2019.2899212 article EN IEEE Transactions on Robotics 2019-03-18

This paper focuses on minimum-time path tracking, a subproblem in motion planning of robotic systems. We generate time-optimal velocity profile for manipulators taking into account kinematic and dynamic constraints. Based the special structure constraints (called peaked constraints), generation is formulated as linear programming (LP) problem. The LP-based control problem solved by sequential optimization method. presented algorithm has reduced computational time compared to general LP solver.

10.1109/tro.2019.2920090 article EN IEEE Transactions on Robotics 2019-06-21

The paper presents a new methodology for the lateral control of autonomous vehicles.The proposed cascade structure realizes two main components: model predictive (MPC)-based outer loop and an internal (IMC) based inner loop.In loop, unique is introduced that eliminates tuning parameters system by introducing hierarchical optimization system.Each cost function focuses on minimizing physical phenomenon.The handles dynamics nonlinearities, providing robust against external disturbances...

10.12700/aph.20.2.2023.2.10 article EN Acta Polytechnica Hungarica 2023-01-01

Time-optimal motion planning is one of the most essential problems in robotic theories. The presented direct transcription approach uses convex optimisation method to obtain a minimum-time control for robot manipulators. One subset waiter problem that consists moving tablet from place another as fast possible, avoiding slip object placed upon it. In this paper order solve problem. This path tracking also approximated by sequential two dimensional second-order cone programs (SOCP) using...

10.1016/j.ifacol.2017.08.749 article EN IFAC-PapersOnLine 2017-07-01

Line follower robots can be used for many important robotic and industrial tasks. One of the most factors in these methods is computational requirement algorithm. The paper presents a novel method line following problem using image processing technique. Our main goal to find an efficient way with real-time computing track camera-equipped robot. To measure effectiveness presented method, we compare two tracking being only difference between them. first robot uses proposed camera-based other...

10.1109/saci.2018.8440975 article EN 2018-05-01

10.3182/20020721-6-es-1901.01317 article EN IFAC Proceedings Volumes 2002-01-01

The systematic design of a Linear Quadratic Regulator (LQR) state-feedback controller with an integral action is presented for quadratic DC/DC boost converter topology. weighting factors are selected respect to energy considerations. By using Kalman Filter both filtering and state estimation purpose Gaussian (LQG) obtained. For the proper operation LQG average state-space model non ideal elements introduced. Detailed simulation study in discrete time-domain demonstrating robustness LQR LQG....

10.1109/optim.2015.7427003 article EN 2015-09-01

In this paper we examine the minimum-time velocity profile generation problem which belongs to second stage of decoupled robot motion planning. The time-optimal can be translated a convex optimal control task through nonlinear change variables. When constraints have special structure, solution obtained by linear programming (LP). case, along path is maximised, instead time minimising. benefit LP lower computational time. Validation algorithm also presented based on simulation results.

10.1080/00207179.2017.1286535 article EN International Journal of Control 2017-01-25

10.1007/s00371-013-0885-2 article EN The Visual Computer 2013-09-30

We discuss a new generic optimal controller structure for raw material blending in the cement industry. focus on an important phase of proportioning-burning-grinding operation triplet that essentially determines quality; namely, composition control mill system. begin by describing application to this phase, followed discussion engineering background and design realized controller. Finally, algorithm is discussed technology-independent manner.

10.1109/mcs.2003.1172832 article EN IEEE Control Systems 2003-02-01

Time-optimal motion-planning has been a topic of active research in the literature for while. This paper presents new approach velocity profile generation, which is subproblem motion-planning. In case simplified constraints, generation can be translated to convex optimization problem. However, some practical constraints (e.g., velocity-dependent torque, viscous friction) destroy convexity. The proposed method obtain global optimum nonconvex experimental results with three degrees-of-freedom...

10.1115/1.4044216 article EN Journal of Dynamic Systems Measurement and Control 2019-07-11

10.1016/j.automatica.2005.03.012 article EN Automatica 2005-05-25

10.3182/20020721-6-es-1901.00472 article EN IFAC Proceedings Volumes 2002-01-01

The paper is concern with the investigation of control Doubly Fed Induction Generator (DFIG) carried out by Rotor Side Converter (RSC) applied in wind energy harvest. Throughout principle Stator Flux Oriented Vector Control (SFOVC) applied. In first part a general slip-torque relation derived three torque components: one component stator voltage, other d and third q rotor voltage space vector. second paper, dynamic behavior algorithm controlling active reactive power simulated open loop closed loop.

10.1109/iyce.2015.7180797 article EN 2015-05-01

A novel microgrid control is proposed in the paper. Independent of active and reactive power for each unit connected to common bus realized addition sharing designed ratio among units. The concepts voltage droop frequency applied widely are incorporated here as well. price paid independent reference frame transformation needed control.

10.1109/icrera.2014.7016507 article EN 2014 International Conference on Renewable Energy Research and Application (ICRERA) 2014-10-01
Coming Soon ...