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1.
Electrohydraulic pressure control by a self-adjusting proportional derivative controller
Darko Lovrec, Friedrich Faber, 2006, izvirni znanstveni članek

Opis: The main characteristic of an electrohydraulic pump control system is the presence of an electrical signal path. It requires at least one sensor for the controlled value (in this case pressure), delivering feedback to be compared with the electrical or numerical reference in the controller. The additonal expense penalty for the sensor and the valve is offset by the advantage of flexibility in the structure and parameters of the controller in comparison to hydraulic - mechanical concepts. Thus, the transfer response can be adapted to demands, even in the operational state. Sophisticated control structures can be implemented easily in the form of computer or microcontroller programs. The layout of electrohydraulic pressure control discussed in this study includes the presented loading unit. The variable pump is designed to act together with a proportional valve having two metering edges. It is less expensive compared to the design with a synchronizing cylinder and four metering edges. However, only inferior static and dynamic performance can be expected. Hydraulic energy is supplied to the control valve directly from the output port of the pump - with the advantage of simple assembly, as there are no additional components required - but with the drawback that there is influence on the control loop`s properties at every change in the disturbance value or reference. The aim of the study presented in this paper is a more efficient and simple concept compared to other known methods for pressure control of the above mentioned pump including the dynamics of the distribution network, and also the characteristics of the hydraulic load with special focus on improvements in steady state and dynamic behaviour.
Ključne besede: automatic control engineering, electrohydraulic systems, pressure control, self-adjusting proportional controller
Objavljeno: 31.05.2012; Ogledov: 999; Prenosov: 21
URL Povezava na celotno besedilo

2.
Rapid control prototyping using MATLAB/Simulink and a DSP-based motor controller
Darko Hercog, Karel Jezernik, 2005, izvirni znanstveni članek

Opis: A rapid control prototyping (RCP) system, based on commercially available software and custom in-house developed hardware is presented. An RCP system successfully combines the well-known simulation program MATLAB/Simulink and the custom DSP-based floating point motor controller. An RCP system provides smooth and fast transition from off-line simulation in Simulink to real-time operation on the embedded motor controller. On-the-fly parameter tuning and data visualization are provided in addition to rapid code generation. The presented solution represents a powerful, versatile and portable RCP system especially suitable for educational processes as well as motor control research. This article is supplemented by an example of cascade DC motor control.
Ključne besede: control education, control experiments, rapid control prototyping, DSP controller
Objavljeno: 01.06.2012; Ogledov: 1108; Prenosov: 28
URL Povezava na celotno besedilo

3.
MIDI TECHNOLOGY AND COMPARISON BETWEEN KORG M50 AND MULAB MIDI SEQUENCING
Vladimir Popovski, 2015, magistrsko delo

Opis: In the following research, a theoretical and practical analysis of MIDI technology will be presented, along with an in-depth comparasion between two types of sequencers: the integrated sequencer of the Korg M50 and the software sequencer of MuLab Free. The purpose of this thesis is, first, to introduce MIDI technology and its construction ,its individual parts, and its practical uses; and, second, to offer a comparation between the Korg M50 and MuLab Free, with the end goal being to aid future users of MIDI sequencers in choosing the appropriate sequencer for the appropriate situation.
Ključne besede: MIDI, sequencer, korg, mulab, synthesizer, MIDI controller
Objavljeno: 05.06.2015; Ogledov: 595; Prenosov: 47
.pdf Celotno besedilo (4,79 MB)

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Position control with parameter adaptation for a nano-robotic cell
Gregor Škorc, Jure Čas, Simon Brezovnik, Riko Šafarič, 2011, izvirni znanstveni članek

Opis: This paper describes the development of a nano-assembly system, built up using linear piezo motors. The so-called nano-robotic cell is based on an X/Y manipulator, supported by three serving tables, movable within a Z axis, and aposition controlled using two different types of a bang-bang control methods. The presented application has been developed as a stand-alone application with the LabVIEW Real Time software package, a PCI-7356 servo controller card and a TMCM-090 stepper driver. Our experiments focused on two major problems present during the construction of nano-robotic assembly cells. The first one is a nonlinear characteristic of a linear piezo motor, which makes the use of classical control methods very limited. The second problem appears when a nano-robotic cell needs a bigger working space and at the same time, production demands that the manipulator moves more often over longer distances. In order to position in nano-resolution, the motors have to run at higher resolutions with smaller speeds. Therefore, long distance moves slow down the entire production process. Experiments on this system have shown that positioning within the nano-scale is possible, using a simple control method such as the bang-bang control method. Although positioning using this method is possible, certain limitations and weaknesses exists, making this simple method useless in nano-scale if higher speeds and longer move distances are needed. Certain changes in the basic control algorithm are proposed, which will ensure that the bangbang control method becomes useful within higher speeds and over longer distances. All recommendations are supported and backed- up by practical experimental results.
Ključne besede: nanorobotske celice, nanopozicioniranje, histerezni krmilnik, proizvodnja MEMS, realno-časovni LabView, nano-robot cells, nano-positioning, bang-bang controller, MEMS assembly, LAbVIEW, real time
Objavljeno: 10.07.2015; Ogledov: 577; Prenosov: 39
URL Povezava na celotno besedilo

6.
An ℋ∞ optimal robust pole placement with fixed transparent controller structure on the basis of nonnegativity of even spectral polynomials
Andrej Sarjaš, Rajko Svečko, Amor Chowdhury, izvirni znanstveni članek

Opis: This paper presents the synthesis of an optimal robust controller with the use of pole placement technique. The presented method includes solving a polynomial equation on the basis of the chosen fixed characteristic polynomial and introduced parametric solutions with a known parametric structure of the controller. Robustness criteria in an unstructured uncertainty description with metrics of norm ℋ∞ are for a more reliable and effective formulation of objective functions for optimization presented in the form of a spectral polynomial with positivity conditions. The method enables robust low-order controller design by using plant simplification with partial-fraction decomposition, where the simplification remainder is added to the performance weight. The controller structure is assembled of well-known parts such as disturbance rejection, and reference tracking. The approach also allows the possibility of multiobjective optimization of robust criteria, application of mixed sensitivity problem, and other closed-loop limitation criteria, where the common criteria function can be composed from different unrelated criteria. Optimization and controller design are performed with iterative evolution algorithm.
Ključne besede: optimal robust controller, optimization, algorithm
Objavljeno: 15.06.2017; Ogledov: 240; Prenosov: 103
.pdf Celotno besedilo (3,03 MB)
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7.
Controllership influences on the restructuring of Slovenian companies
Danijel Lebar, Iztok Kolar, 2015, izvirni znanstveni članek

Opis: Controllership, as an informational activity, is becoming a multidimensional function, about which numerous doubts exist as to whether to increase its independency and integrate it tightly with the decision-making process. Financial knowledge and business-analytical capabilities of carriers of controllership activity can offer support for operational, financial, and strategic restructuring. This is important when facing frequent business dynamics in order to enhance competitiveness and especially achieve short-term as well as strategic goals.
Ključne besede: controllership, controller, restructuring, financial knowledge, business-analytical capabilities
Objavljeno: 03.04.2017; Ogledov: 365; Prenosov: 80
.pdf Celotno besedilo (431,15 KB)
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8.
Intelligent adaptive cutting force control in end-milling
Uroš Župerl, Franc Čuš, Edvard Kiker, 2006, izvirni znanstveni članek

Opis: In this article, an adaptive neural controller for the ball end-milling process is described. Architecture with two different kinds of neural networks is proposed, and is used for the on-line optimal control of the milling process. A BP neural network is used to identify the milling state and to determin the optimal cutting inputs. The feedrate is selected as the optimised variable, and the milling state is estimated by the measured cutting force. The adaptive controller is operated by a PC and the adjusted feedrates are sent to the CNC. The purpose of this article is to present a reliable, robust neural controller aimed at adaptively adjusting feed-rate to prevent excessive tool wear, tool breakage and maintain a high chip removal rate. The goal is also to obtain an improvement of the milling process productivity by the use of an automatic regulation of the cutting force. Numerous simulations are conducted to confirm the efficiency of this architecture. The proposed architecture for on-line determining of optimal cutting conditions is applied to ball end-milling in this paper, but it is obvious that the system can be extended to other machines to improve cutting efficiency.
Ključne besede: end milling, adaptive force control, neuron controller, cutting conditions, adaptive control systems
Objavljeno: 12.07.2017; Ogledov: 251; Prenosov: 48
.pdf Celotno besedilo (3,43 MB)
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