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2007 Mediterranean Conference on Control and Automation, MED

作者： Balan, Radu Maties, Vistrian Hancu, Olimpiu Stan, Sergiu Ciprian, Lapusan Mechatronics Department Faculty of Mechanics Technical University of Cluj-Napoca Cluj-Napoca Romania

ISBN: (纸本)142441282X

Model Based Predictive Control is a class of computer algorithms that explicitly use a process model to predict future plant outputs and compute an appropriate control action through on-line optimization of a cost objective over a future horizon, subject to various constraints. The cost function is defined in terms of the tracking error (the difference between the predicted output and set-point). Using this scheme, many different MBPC algorithms have been proposed in the literature. This paper presents an adaptive-predictive control algorithm, which uses on-line simulation and rule-based control. The algorithm is applied to an electrode position system of an electric arc furnace. Electric arc furnaces are commonly used in steelmaking and in smelting of nonferrous metals. To obtain the electric arc, usually there are used three graphite electrodes. The power level depends by the positions of the electrodes. As a result, the realization of a competitive control system is very important because it led to reduction of the energy consumption, pollution, and increases the safety of the process. ©2007 IEEE.

关键词： Graphite electrodes

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Determination of the thickness-shear resonance frequency for piezoelectric accelerometers using the KLM model

Determination of the thickness-shear resonance frequency for...

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13th International Congress on Sound and Vibration 2006, ICSV 2006

作者： Ursu, Mihai Department of Mechanics and Computer Programming Technical University of Cluj-Napoca Muncii Bvd. 103-105 400641 Cluj-Napoca Romania

ISBN: (纸本)9781627481502

In this paper a complete equivalent electric circuit for a planar shear piezoelectric accelerometer is presented. Starting from the KLM (Krimholtz-Leedom-Matthaei) approach for a single piezoceramic plate sandwiched between two cladding layers, the model is extended in order to facilitate the frequency domain analysis for arbitrary geometries of the seismic masses. An original and complete PSpice circuit source is given for illustrating the spectra calculations. Copyright© (2006) by the International Institute of Acoustics & Vibration.

关键词： Frequency domain analysis

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A predictive control algorithm - Some applications for nonlinear processes

A predictive control algorithm - Some applications for nonli...

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2007 Mediterranean Conference on Control and Automation, MED

作者： Balan, Radu Maties, Vistrian Hancu, Olimpiu Stan, Sergiu Ciprian, Lapusan Mechatronics Department Faculty of Mechanics Technical University of Cluj-Napoca Cluj-Napoca Romania

ISBN: (纸本)142441282X

This paper presents some applications of a Model Based Predictive Control (MBPC) type algorithm which is applied to nonlinear processes. The basic idea of the algorithm is the on-line simulation of the future behaviour of the control system, by using a few candidate control sequences. Then, using rule based control these simulations are used to obtain the 'optimal' control signal. The efficiency and applicability of the proposed algorithm are demonstrated through applications. ©2007 IEEE.

关键词： Model predictive control

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Numerical and experimental analysis of the state of stresses of the femoral neck - Plane modeling 10

Numerical and experimental analysis of the state of stresses...

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10th IMEKO TC15 Youth Symposium on Experimental Solid mechanics 2011

作者： Takacs, Ioana Alexandra Botean, Adrian-Ioan Hrdu, Mihail Technical University of Cluj-Napoca Faculty of Mechanics Department of Strength of Materials Cluj-Napoca Romania

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Preemptive Real Time Operating System for Low Power Microcontrollers 29

Preemptive Real Time Operating System for Low Power Microcon...

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29th IEEE International Symposium for Design and Technology in Electronic Packaging, SIITME 2023

作者： Cernat, Teodora Daraban, Mihai Corches, Cosmina Chindris, Gabriel Technical University of Cluj-Napoca Applied Electronics Department Cluj-Napoca Romania Technical University of Cluj-Napoca Automation Department Cluj-Napoca Romania

ISBN: (纸本)9798350344110

In operating systems (OSs), there are two types of scheduling methods in which CPU resources are allocated: non-preemptive and preemptive scheduling. Embedded system developers generally create applications using a non-preemptive scheduler OS owing to limited resources and better control over the tasks and behavior of the system. With a non-preemptive scheduler, programming tasks and system functionalities are more complex as it does not permit interruptions other than the scheduler. By contrast, a preemptive scheduler allows for easier application development as each task is seen as an independent action or program that can be interrupted at any given time. Therefore, this paper, a scheduler algorithm implementation based on round-robin and priority algorithms for low -power microcontrollers. Combining these two algorithms increases the system performance because of improved resource allocation to the tasks executed. © 2023 IEEE.

关键词： Microcontrollers

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Vibrations concerning with safety in vehicle rolling conditions 2

Vibrations concerning with safety in vehicle rolling conditi...

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2nd Conference on Mechanisms, Transmissions and Applications, MeTrApp 2013

作者： Diudea, Mircea Hodor, Victor Balan, Radu Bara, Mircea Department of Mechanisms Precision Mechanics and Mechatronics Technical University of Cluj-Napoca Cluj-Napoca Romania

ISBN: (纸本)9789400774841

This paper is intended as a study of the composition of existing vibrations in the rear of a car, while it is running in order to increase traffic safety. The main factors that cause the occurrence of these vibrations are related to runway irregularities, imperfections of the elements that compose the system running, and the vibrations caused by aerodynamic (CFD predictions) of the shell –as it runs at high speed (i.e. in-between legal limits). Accuracy in terms of the gas-dynamics behavior, implies a CFD analysis with LES model. Predicting the distinct characteristics in relation to sources, follows the influence related to the wheel and respective to body motion. These analyses were done by the use of FFT method, and with the classic procedures in processes controlling–using MATLABSimulink. These are analyzed in order to face a common risk of resonance in certain specific conditions, to prevent safety running conditions. © Springer International Publishing Switzerland 2014.

关键词： Simulink

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Measurement of materials proprieties by electronic speckle pattern interferometry 10

Measurement of materials proprieties by electronic speckle p...

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10th IMEKO TC15 Youth Symposium on Experimental Solid mechanics 2011

作者： Dudescu, Cristian Technical University of Cluj-Napoca Faculty of Mechanics Department of Strength of Materials Cluj-Napoca Romania

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Design of in-pipe modular robotic systems

Solid State Phenomena

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Solid State Phenomena 2009年 147-149卷 49-54页

作者： Tătar, Olimpiu Mândru, Dan Department of Mechanisms Precision Mechanics and Mechatronics Faculty of Mechanics Technical University of Cluj-Napoca B-dul Muncii nr. 103-105 Cluj-Napoca400641 Romania

In this paper, we proposed two wheeled-type in-pipe modular robotic systems. These modular systems are composed of driving modules (which use mechanisms with articulated elements) and passive modules. The first module (driving module) generates the traction force. The passive module is necessary to carry the control electronic equipment and for the transport of the needed equipment for realization of the in-pipe inspection. The joint disposed (universal join) by the two modules of the robot offers the capacity of orientation of this one. © (2009) Trans Tech Publications, Switzerland.

关键词： Oscillators (electronic)

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A genetic algorithm approach for the multidimensional two-way number partitioning problem 1

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7th International Conference on Learning and Intelligent Optimization, LION 7

作者： Pop, P.C. Matei, O. Department of Mathematics and Informatics Technical University of Cluj-Napoca Cluj-Napoca Romania Department of Electrical Engineering Technical University of Cluj-Napoca Cluj-Napoca Romania

ISBN: (数字)9783642449734

ISBN: (纸本)9783642449727

This paper addresses the problem of partitioning a set of vectors into two subsets such that the sums per every coordinate should be exactly or approximately equal. This problem, introduced by Kojic [8], is called the multidimensional two-way number partitioning problem (MDTWNPP) and generalizes the classical two-way number partitioning problem. We propose an efficient genetic algorithm based heuristic for solving the multidimensional two-way number partitioning problem. The performances of our genetic algorithm have been compared with the existing numerical results obtained by CPLEX based on an integer linear programming formulation of the problem. The obtained preliminary results, in the case of medium and large instances, reveal that our proposed methodology performs very well in terms of both quality of the solutions and the computational times compared with the previous method of solving the MDTWNPP. © 2013 Springer-Verlag.

关键词： Combinatorial optimization

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Multi-objective genetic algorithms applied for optimal design of 2 DOF micro parallel robots

Multi-objective genetic algorithms applied for optimal desig...

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2007 IEEE Workshop on Advanced Robotics and its Social Impacts, ARSO 2007

作者： Stan, Sergiu-Dan Maties, Vistrian Balan, Radu Technical University of Cluj-Napoca Dept. of Mechanics and Programming 103-105 B-dul Muncii 400641 Cluj-Napoca Romania Technical University of Cluj-Napoca Dept. of Mechatronics 103-105 B-dul Muncii 400641 Cluj-Napoca Romania

ISBN: (纸本)9781424419531

This paper is aimed at presenting a study on the optimization of the Biglide and Bipod mini parallel robots, which comprises two-degree-of-freedom (DOF) mini parallel robots with constant and variable struts. The robot workspace is characterized and the inverse kinematics equation is obtained. In the paper, design optimization is implemented with Genetic Algorithms (GA) for optimization considering transmission quality index, design space and workspace. Here, intended to show the advantages of using the GA, we applied it to a multicriteria optimization problem of 2 DOF mini parallel robots. Genetic algorithms (GA) are so far generally the best and most robust kind of evolutionary algorithms. A GA has a number of advantages. It can quickly scan a vast solution set. Bad proposals do not affect the end solution negatively as they are simply discarded. The obtained results have shown that the use of GA in such kind of optimization problem enhances the quality of the optimization outcome, providing a better and more realistic support for the decision maker. ©2007 IEEE.

关键词： Genetic algorithms

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