Browsing by Subject "adaptive control"

Now showing 1 - 8 of 8

Access status: Open Access ,
Active noise control with moving error microphone
(Wydawnictwa AGH, 2008) Michalczyk, Małgorzata
Electro-acoustic plants controlled by active noise control (ANC) systems in enclosures are usually time-varying. Their changes can be caused by movements of an error microphone, around which zones of quiet are created. Then, the time variations of the electro-acoustic plant can be fast and adaptive ANC algorithms for tracking variations of error microphone position should be used. The preliminary research results showed that the created zone of quiet can move tracking the movement of the error microphone, when filtered-x least mean squares (FX-LMS) algorithm is applied. The paper presents further results of real-world experiments conducted on a special laboratory stand, which enabled to move the error microphone round the circle trajectory with constant rota- tional speed. Two modifications of FX-LMS algorithm were applied in order to accelerate control algorithm convergence and improve tracking properties of the ANC system: normalized FX-LMS and modified FX-LMS algorithm. It was shown, that the zone of quiet can track movement of the error microphone, however, there was no significant difference in control algorithms performance. In all cases the zone of quiet tracked the movement of the error microphone, even for the error microphone velocity as high as 3.7 m/s, and high attenuation was obtained - from 16 dB for the fast microphone movement up to 28 dB for the slowest microphone movement.
Access status: Open Access ,
Adaptacyjny układ regulacji z predyktorem Smitha z możliwością zastosowania w systemach rozproszonych
(Wydawnictwa AGH, 2008) Tutaj, Andrzej
The paper describes an adaptive control system for a linear finite-dimensional and asymptotically stable SISO plant with a slowly changing delay time at the input or output. The estimate of a dead time obtained by a continuous identification is used in a delay line, which is a part of a Smith predictor. Use of the adaptation enlarges the stability region and increases the performance of a system. The described setup can be used for distributed control systems where delays are introduced by the communication network. This approach succeeds if delays in the network vary slowly with time.
Access status: Open Access ,
Control and identification algorithms for acoustic noise reduction
(Wydawnictwa AGH, 2007) Figwer, Jarosław; Czyż, Krzysztof; Główka, Teresa; Kasprzyk, Jerzy; Michalczyk, Małgorzata I.; Pawełczyk, Marek
The aim of the paper is to present main aspects of a research project on active noise reduction being performed at the Computer Control System Group, which is a part of the Institute of Automatic Control, Silesian University of Technology, Gliwice, Poland. In particular, the following problems are dealt with: higher order spectra in off-line and on-line identification of electro-acoustic plants for active noise reduction systems; creating distributed local zones of quiet in a reverberant enclosure using two structures: based on spatially distributed transducers controlled by a central unit or implemented as decentralized systems; development and analysis of optimal and adaptive feedback systems for generating zones of quiet at desired locations; enhancement of active noise reduction efficiency using nonuniform signal sampling and oversampling techniques; design and implementation of a portable multi-channel active noise control platform.
Access status: Open Access ,
Control system preventing thermal gradient development on foils of foil bearing
(Wydawnictwa AGH, 2015) Lubieniecki, Michał Lucjan; Miodunka, Marek
This article presents attempts at automating a control system to reduce temperature scatter on the foil of a foil bearing. The control system reads the temperatures at six circumferential locations of the bearing's foil and distributes control currents to the thermoelectric modules integrated into the bearing's bushing. Three basic approaches have been proposed and tested: 1) a simple hot-spot tracking algorithm assigning predefined current values to the modules closest to the hot-spot location, 2) a tracking algorithm reducing abrupt changes in the control currents and, in effect, the local heat flux distribution, and 3) a tracking algorithm enhanced with a PID controller. The proposed controller has been implemented and compared to the performance of a temperature controller that does not have tracking capabilities. The implemented control strategies have proven the feasibility of temperature scatter reduction inside the investigated bearing. In most test cases, the instantaneous gradient reduction exceeded 50% (reaching 63% at its best).
Access status: Restricted ,
Inteligentne sterowanie wieloma obiektami dynamicznymi korzystające z idei Industry 4.0
(Data obrony: 2018-09-26) Pacanowski, Piotr
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Restricted ,
Wspomagający regulator neuronowy uczący się w czasie rzeczywistym dla systemu magnetycznej lewitacji
(Data obrony: 2018-06-21) Lelowicz, Kamil
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Restricted ,
Zaawansowane metody sterowania modelem laboratoryjnym wahadła na wózku implementowane w sterowniku PLC
(Data obrony: 2018-09-18) Żegleń, Jakub
Wydział Elektrotechniki, Automatyki, Informatyki i Inżynierii Biomedycznej
Access status: Restricted ,
Zastosowanie sztucznych sieci neuronowych w sterowaniu adaptacyjnym
(Data obrony: 2017-01-17) Kabała, Karol
Wydział Inżynierii Mechanicznej i Robotyki