Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 13

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
Wyszukiwano:
w słowach kluczowych:  adaptive algorithm
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available Adaptacyjny algorytm regulacji strumienia powietrza
PL
W pracy przedstawiono adaptacyjny algorytm sterowania strumieniem powietrza do zastosowania w bioreaktorze do kompostowania odpadów. Układ steruje strumieniami powietrza dostarczanego do sześciu kanałów bioreaktora. Bioreaktory tego typu charakteryzują się tym, że porowatość wsadu jest bardzo niejednorodna w całej objętości. Ponadto podczas trwania procesu następuje zagęszczanie się wsadu i niejednokrotnie powstają zatory dla przepływu gazu. Algorytm sterowania powinien uwzględniać powstawanie zatorów i podejmować próbę ich udrożnienia. W sytuacjach, w których udrożnienie jest niemożliwe, powinien zapewniać prawidłowy rozkład przepływu powietrza w pozostałych kanałach mimo występowania zatorów. Nadrzędnym celem algorytmu jest zapewnienie równych strumieni przepływu powietrza we wszystkich kanałach bez względu na różnice w oporach przepływu. Ponieważ w bioreaktorach obieg powietrza jest wymuszony za pomocą wentylatorów o stałej wydajności, algorytm powinien w sposób adaptacyjny określić maksymalną średnią wartość strumieni powietrza jaka jest możliwa do uzyskania w danych warunkach i tak dopasować układ regulacji, aby ją osiągnąć. W pracy zaproponowano rozwiązanie umożliwiające spełnienie tych wymagań.
EN
The paper presents an adaptive air stream control algorithm for use in a bioreactor for waste composting. The system controls the streams of air supplied to the six ducts of the bireactor. Bioreactors of this type are characterized by the fact that the porosity of the charge is very heterogeneous throughout the volume. In addition, during the process, the charge is compacted and blockages for the gas flow often occur. The control algorithm should take into account the formation of blockages and attempt to clear them. In situations where unblocking is impossible, it should ensure proper distribution of air flow in other ducts despite the presence of blockages. The overriding goal of this algorithm is to ensure equal air flow streams in all channels, regardless of differences in flow resistance. Since the air circulation in bioreactors is forced by fans with constant capacity, the algorithm should adaptively determine the maximum average value of air streams that is possible to obtain under given conditions and adjust the control system to achieve it. The paper proposes a solution to meet these requirements.
PL
W artykule przedstawiono warstwę komunikacji radiowej dopasowaną do potrzeb systemu zdalnego odczytu danych z wodomierzy, bazującego na stacjonarnych czytnikach zrealizowanych w technice radia zdefiniowanego programowo. Zaprezentowano analizę teoretycznego zasięgu systemu i pojemności w relacji do popularnego standardu Wireless M-Bus.
EN
The article presents a radio communication layer designed for a remote data reading system from water meters, based on stationary readers utilizing software-defined radio technology. An analysis of the theoretical range of the system and capacity in relation to the popular Wireless M-Bus standard was presented
EN
From a user perspective, the current development of the generic term Industry 4.0 increasingly moves its orientation towards flexible production. Due to increasingly variable products with small quantities and the resulting high degree of adaptability of a plant over its entire operating phase, the need for rapid production commissioning gives rise to the demand for live commissioning support and technology evaluation of induced production start-ups. Classification axioms can be formed by 1-class learning procedures for the predictive state evaluation of subsequent production start-ups based on collected machine and process data from past production start-ups. The starting point is an adaptive algorithm that performs a dynamic tolerance band formation based on different criteria, emphasizing on adaptive characteristic segmentation. This first step represents comprehensive condition monitoring. Based on this algorithm, correlation considerations can be performed on the data structure, the measured variables, and the diagnostic parameters. Moreover, the structure of production systems can and should be included in the analyzation, so that probabilistic causalities can be postulated and then be added to the underlying data sets for quantification. Using these adaptive structure-based segmentations is the first step to interpret data sets of new production systems without the need for complex pre-configuration.
4
EN
The paper describes the selected methods of adaptive control of the pulverized coal combustion process overview with various types of prognostic models. It was proposed to use a class of control methods that are relatively well established in industrial practice. The presented approach distinguishes the use of an additional source of information in the form of signals from an optical diagnostic system and models based on selected deep structures of recurrent networks. The research aim is to increase the efficiency of the combustion process in the power boiler, taking into account the EU emission standards, leading in consequence to sustainable energy and sustainable environmental engineering.
PL
W artykule opisano wybrane metody adaptacyjnego sterowania przeglądem procesu spalania pyłu węglowego z wykorzystaniem określonych modeli prognostycznych. Zaproponowano użycie metod, które są stosunkowo dobrze znane w praktyce przemysłowej. Przedstawione podejście wyróżnia wykorzystanie dodatkowego źródła informacji w postaci sygnałów z optycznego systemu diagnostycznego i modeli opartych na strukturach sieci głębokich. Badania mają na celu zwiększenia efektywności procesu spalania w kotle energetycznym, z uwzględnieniem norm emisji UE, prowadząc w konsekwencji do zrównoważonej energii i zrównoważonej inżynierii środowiska.
EN
The paper considers an algorithm for increasing the accuracy of measuring systems operating on moving objects. The algorithm is based on the Kalman filter. It aims to provide a high measurement accuracy for the whole range of change of the measured quantity and the interference effects, as well as to eliminate the influence of a number of interference sources, each of which is of secondary importance but their total impact can cause a considerable distortion of the measuring signal. The algorithm is intended for gyro-free measuring systems. It is based on a model of the moving object dynamics. The mathematical model is developed in such a way that it enables to automatically adjust the algorithm parameters depending on the current state of measurement conditions. This makes possible to develop low-cost measuring systems with a high dynamic accuracy. The presented experimental results prove effectiveness of the proposed algorithm in terms of the dynamic accuracy of measuring systems of that type.
PL
W artykule przedstawiono zagadnienie zastosowania robota manipulacyjnego w procesie obróbki mechanicznej. Ze względu na specyfikę sterowanego procesu i obiektu, tzn. nieznajomość i niepewność parametrów modelu matematycznego, do sterowania procesem zastosowano algorytm adaptacyjny. W artykule podano model matematyczny obiektu sterowania, zaprezentowano hybrydowy pozycyjno-siłowy algorytm sterowania z adaptacją parametrów modelu matematycznego oraz zaprezentowano wyniki testu przeprowadzonego na stanowisku laboratoryjnym.
EN
This paper presents the problem of the application of the robotic manipulator in the machining. Due to the nature of the process and the controlled object, i.e. lack of knowledge and uncertainty parameters of the mathematical model, an adaptive algorithm for process control is used. In this paper the mathematical model of the controlled object, synthesis of the hybrid position-force control and results of a verification carried out on a laboratory stand are presented.
EN
Active Noise Control (ANC) of noise transmitted through a vibrating plate causes many problems not observed in classical ANC using loudspeakers. They are mainly due to vibrations of a not ideally clamped plate and use of nonlinear actuators, like MFC patches. In case of noise transmission though a plate, nonlinerities exist in both primary and secondary paths. Existence of nonlinerities in the system may degrade performance of a linear feedforward control system usually used for ANC. The performance degradation is especially visible for simple deterministic noise, such as tonal noise, where very high reduction is expected. Linear feedforward systems in such cases are unable to cope with higher harmonics generated by the nonlinearities. Moreover, nonlinearities, if not properly tackled with, may cause divergence of an adaptive control system. In this paper a feedforward ANC system reducing sound transmitted through a vibrating plate is presented. The ANC system uses nonlinear control filters to suppress negative effects of nonlinearies in the system. Filtered-error LMS algorithm, found more suitable than usually used Filtered-reference LMS algorithm, is employed for updating parameters of the nonlinear filters. The control system is experimentally verified and obtained results are discussed.
PL
W pracy przedstawiono algorytm adaptacyjnego przetwarzania obrazów, wykorzystujący, centralnie ważony filtr medianowy (CWFM) oraz informację o lokalnej zmianie wariancji w stosunku do wartości wariancji zakłócenia. Metoda ta opiera się na tym , że w obszarze „płaskim” należy stosować mniejsze zwielokrotnienie (wagę) próbki centralnej do wyznaczania wartości sygnału wyjściowego, w przypadku większego zakłócenia. Natomiast w przypadku natrafienia na krawędź, stosunek ten nie zależy w dużym stopniu od poziomu zakłócenia, więc należy stosować większą wagę próbki centralnej.
EN
This paper presents an algorithm for adaptive image processing, using, center-weighted median filter (CWFM) and information about local change of variation in relation to the noise variance. This method is based on the fact that in the "flat" to be used less multiplication (weight) of the sample to determine the value of the center output signal, in the case of greater interference. However, in the case of stepping on the edge, this ratio does not depend to a large extent on the level of noise, so you should use a larger sample of central importance.
EN
The most prevalent P2P application today is file sha ring, both among scientific users and the general public. Afundamental process in file sharing systems is the search mechanism. The unstructured nature of real-world largescale complex systems poses a challenge to the search me thods, because global routing and directory services are impractical to implement. This paper presents a new antcolony algorithm, Adaptive Neighboring-Ant Search (AdaNAS), for the semantic query routing problem (SQRP) in a P2P network. The proposed algorithm incor porates an adaptive control parameter tuning technique for runtime estimation of the time-to-live (TTL) of the ants. AdaNAS uses three strategies that take advantage of the local environment: learning, characterization, and explo ration. Two classical learning rules are used to gain ex perience on past performance using three new learning functions based on the distance traveled and the resources found by the ants. The experimental results show that the AdaNAS algorithm outperforms the NAS algorithm where the TTLvalue is not tuned at runtime.
PL
W pracy badane są właściwości podpasmowych odmian trzech znanych algorytmów filtracji adaptacyjnej: unormowanego algorytmu LMS, algorytmu rzutu afinicznego wstecz rzędu 2 (APA) oraz rekursywnego algorytmu najmniejszych kwadratów (RLS). Za ich postawę przyjęto spaczony modulowany kosinusowo bank filtrów, który dokonuje nierównomiernego podziału pasma, dostarczając rzeczywistych sygnałów kanałowych i dobrze aproksymując psychoakustyczną skalę Barków. System adaptacji o strukturze niezależnej od banku syntezy umożliwia poprawę zbieżności i obniżenie złożoności obliczeniowej filtracji adaptacyjnej w porównaniu z rozwiązaniami pełnopasmowymi lub wykorzystującymi banki modulowane DFT.
EN
This paper investigates the properties of subband variants of three adaptive filtering algorithms: Normalized Least Mean Squares, Recursive Least Squares and Affine Projection. A warped cosine-modulated filter bank, which partitions frequency nonuniformly, has been selected as their basis. The system, which produces realvalued channel signals and well approximates the psychoacoustic Bark scalę, make it possible to both improve convergence and decrease computational complexity of adaptive filtering compared with fullband solutions or those that use DFT filter banks.
11
Content available remote Active noise reduction system
EN
In this article, active noise reduction system has been described. The ANR system was made on basis of finite impulse response filter and realised algorithms LMS or NLMS. The algorithms were implemented on the dSPACE card with floating-point processor TMS320C31. Researches were performed in the anechoic chamber and in the enclosure of dimension 4.4 x 3.05 x 3.2 m and reverberation time T=0.53 s. White noise filtered by third and octave filter with mid-band frequency 125 Hz was used for the experiments. The ANR system working in free field conditions (in the anechoic chamber) allowed to obtain the average acoustic pressure level reduction ranging from 9.1 to 24.1 dB for octave, and 14.7 to 23.1 dB for third octave. Measurements carried out in natural acoustics conditions in a selected room allowed to obtain the following values of average acoustic pressure level reduction: for octave from 2.2 to 14.2 dB, and for third octave from 6.4 to 19.8 dB. The result of experiments proved that the convergence time of NLMS algorithm was several times shorter than convergence time of LMS algorithm.
12
Content available remote An adaptive, active noise reduction system in closed space
EN
In this article, an active noise reduction system has been described. The ANR system was made on the basis of an finite impulse response filter and realised by LMS or NLMS algorithms. Those algorithms were implemented on the dSPACE card with a floating-point processor TMS320C31. The researches were performed in an enclosure of dimensions 4.4, 3.05, 3.2m. White noise filtered by third and octave filters with mid-band frequency 125Hz were used for the experiments. The result of experiments was a reduction of the sound pressure level, meanly from 10 to 20dB for the natural sound field. The investigations performed revealed that the location of reference and error microphones in the acoustic system - in the room, influence significantly the efficiency of the ANR system working. The investigations performed in a selected room (volume V=41.6m3 and reverberation time T=0.53s) revealed that projected and built up system gives very good effects in the active noise reduction for random, white noises of selected ranges.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.