Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "pattern analysis" wg kryterium: Temat

  Lista filtrów
Wyrównaj
    Wyświetlanie 1-10 z 10
    Tytuł:
    Diagnostics of Synchronous Motor Based on Analysis of Acoustic Signals with the use of Line Spectral Frequencies and K-nearest Neighbor Classifier
    Autorzy:
    Glowacz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/176610.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic signal
    pattern analysis
    synchronous motor
    diagnostics
    Opis:
    In industrial processes electrical motors are serviced after a specific number of hours, even if there is a need for service. This led to the development of early fault diagnostic methods. Paper presents early fault diagnostic method of synchronous motor. This method uses acoustic signals generated by synchronous motor. Plan of study of acoustic signal of synchronous motor was proposed. Two conditions of synchronous motor were analyzed. Studies were carried out for methods of data processing: Line Spectral Frequencies and K-Nearest Neighbor classifier with Minkowski distance. Condition monitoring is useful to protect electric motors and mining equipment. In the future, these studies can be used in other electrical devices.
    Źródło:
    Archives of Acoustics; 2014, 39, 2; 189-194
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recognition of Monochrome Thermal Images of Synchronous Motor with the Application of Skeletonization and Classifier Based on Words
    Rozpoznawanie monochromatycznych obrazów cieplnych silnika synchronicznego z zastosowaniem szkieletyzacji i klasyfikatora opartego na słowach
    Autorzy:
    Głowacz, A.
    Głowacz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/354414.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Electrical Fault Detection
    pattern analysis
    thermal images
    synchronous motor
    classifier based on words
    elektryczne wykrywanie usterek
    termografia
    obrazy termiczne
    silnik synchroniczny
    klasyfikator oparty na słowach
    Opis:
    Thermography is a technology that enables recognition of objects in the specific area. The goal of using thermographic techniques for ironworks is to diagnose electrical equipment. These techniques can be also use to increase safety and quality control in ironworks. Faulty equipment can be dangerous for engineers. Article describes the method of the recognition of imminent failure states of synchronous motor. Thermal images of the stator are used for an analysis of electrical machine. Researches of image processing techniques have been carried out for three states of motor. Proposed approach uses patterns recognition. Using of medial axis transformation and classifier based on words gave good results. In the future electrical machines and metallurgical equipment will use diagnostic systems based on recognition of thermal images.
    Termografia jest technologią, która umożliwia rozpoznawanie obiektów w określonym obszarze. Celem używania technik termograficznych dla hut jest diagnozowanie sprzętu elektrycznego. Te techniki mogą być również używane do zwiększenia bezpieczeństwa i jakości kontroli w hutach. Wadliwy sprzęt może być niebezpieczny dla inżynierów. Artykuł opisuje metodę diagnostyki stanów przedawaryjnych silnika synchronicznego. Obrazy cieplne stojana są używane do analizy maszyny elektrycznej. Badania technik przetwarzania obrazu zostały wykonane dla trzech stanów silnika. Proponowana metoda używa rozpoznawania wzorców. Użycie transformacji medialnej osi i klasyfikatora opartego na słowach dawało dobre wyniki. W przyszłości maszyny elektryczne i sprzęt hutniczy będą używać systemów diagnostycznych opartych na rozpoznawaniu obrazów cieplnych.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 1; 27-32
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The intramontane Orava Basin - evidence of large-scale Miocene to Quaternary sinistral wrenching in the Alpine-Carpathian-Pannonian area
    Autorzy:
    Ludwiniak, Mirosław
    Śmigielski, Michał
    Kowalczyk, Sebastian
    Łoziński, Maciej
    Czarniecka, Urszula
    Lewińska, Lena
    Powiązania:
    https://bibliotekanauki.pl/articles/138722.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Orava Basin
    Central Carpathian Palaeogene Basin
    structural analysis
    strike-slip related basin
    transrotational basin
    joint pattern analysis
    Western Carpathians
    Kotlina Orawska
    paleogeński basen centralno-karpacki
    paleogeńskiego basen Karpat centralnych
    analiza strukturalna
    basen przesuwczy
    basen transrotacyjny
    Karpaty Zachodnie
    Opis:
    The Carpathian Orava Basin is a tectonic structure filled with Neogene and Quaternary deposits superimposed on the collision zone between the ALCAPA and European plates. Tectonic features of the south-eastern margin of the Orava Basin and the adjoining part of the fore-arc Central Carpathian Palaeogene Basin were studied. Field observations of mesoscopic structures, analyses of digital elevation models and geological maps, supplemented with electrical resistivity tomography surveys were performed. Particular attention was paid to joint network analysis. The NE-SW-trending Krowiarki and Hruštinka-Biela Orava sinistral fault zones were recognized as key tectonic features that influenced the Orava Basin development. They constitute the north-eastern part of a larger Mur-Mürz-Žilina fault system that separates the Western Carpathians from the Eastern Alps. The interaction of these sinistral fault zones with the older tectonic structures of the collision zone caused the initiation and further development of the Orava Basin as a strike-slip-related basin. The Krowiarki Fault Zone subdivides areas with a different deformation pattern within the sediments of the Central Carpathian Palaeogene Basin and was active at least from the time of cessation of its sedimentation in the early Miocene. Comparison of structural data with the recent tectonic stress field, earthquake focal mechanisms and GPS measurements allows us to conclude that the Krowiarki Fault Zone shows a stable general pattern of tectonic activity for more than the last 20 myr and is presently still active.
    Źródło:
    Acta Geologica Polonica; 2019, 69, 3; 339-386
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of stereology for assessment of two-phase flow structures
    Autorzy:
    Masiukiewicz, M.
    Ulbrich, R.
    Zając, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/175510.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    stereological analysis
    two-phase flow pattern
    pattern recognition
    Opis:
    This paper describes a method for two-phase flow structures evaluation of gas-liquid mixture based on theoretical assumptions for the stereology in materials science. This assessment is based on the analysis of digital images, obtained with a high-speed camera. The bright field technique was used for process visualization. The images obtained during the visualisation were, in fact, projections of the structures. For the given recording conditions, the stereological analysis applied was based on the linear method and on the method of random and directed secants. The new methods of determining important parameters of two-phase flow were proposed on the basis of collected data. The parameters are as follows: the volume fraction, the interfacial area, the number of objects in one of the phases of the mixture and two other structural parameters of the selected two-phase fluid obtained from the analysis of the two-dimensional image (average length of chords for projected objects, average free distance for convex shapes from the projection).
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2013, 125; 39-54
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stable or not stable? Recognizing surge based on the pressure signal
    Autorzy:
    Garcia, D.
    Liśkiewicz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/175253.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    singular spectrum analysis
    nonlinear dynamics
    statistical pattern recognition
    compressor
    surge
    Opis:
    The surge protection may be worth millions of dollars. This is typical price of a centrifugal compressor repair combined with additional cost of nonfunctionality of an industry employing it. This threat is normally secured by application of an antisurge systems. Typically they are activated at predefined working conditions when compressor mass flow rate approaches region affected by the surge. As a result those systems are vastly limiting its operational range usually by a desirable region where compressor attains large pressure ratio. Therefore, a modern antisurge systems are aiming at diminishing this tradeoff by reacting to the real pressure signal gathered at high frequency. This paper presents one of those methods employing singular spectrum analysis. This algorithm has not been widely used for this application, while it was shown herein that it may bring clear distinction between stable and nonstable working condition, even at presurge conditions. Hence in further perspective it may bring anti-surge protection quality, that was not met with another methods.
    Źródło:
    Transactions of the Institute of Fluid-Flow Machinery; 2016, 133; 55-68
    0079-3205
    Pojawia się w:
    Transactions of the Institute of Fluid-Flow Machinery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Could k-NN classifier be Useful in tree leaves recognition?
    Autorzy:
    Horaisová, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/229900.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    binary image
    Fourier transform
    affine invariance
    harmonic analysis
    pattern recognition
    k-NN classifier
    Opis:
    This paper presents a method for affine invariant recognition of two-dimensional binary objects based on 2D Fourier power spectrum. Such function is translation invariant and their moments of second order enable construction of affine invariant spectrum except of the rotation effect. Harmonic analysis of samples on circular paths generates Fourier coefficients whose absolute values are affine invariant descriptors. Affine invariancy is approximately saved also for large digital binary images as demonstrated in the experimental part. The proposed method is tested on artificial data set first and consequently on a large set of 2D binary digital images of tree leaves. High dimensionality of feature vectors is reduced via the kernel PCA technique with Gaussian kernel and the k-NN classifier is used for image classification. The results are summarized as k-NN classifier sensitivity after dimensionality reduction. The resulting descriptors after dimensionality reduction are able to distinguish real contours of tree leaves with acceptable classification error. The general methodology is directly applicable to any set of large binary images. All calculations were performed in the MATLAB environment.
    Źródło:
    Archives of Control Sciences; 2014, 24, 2; 177-192
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Critical exponent analysis applied to surface EMG signals for multifunction myoelectric control
    Autorzy:
    Phinyomark, A.
    Phothisonothai, M.
    Phukpattaranont, P.
    Limsakul, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/220544.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomedical signal processing
    electromyography signal
    feature extraction
    fractal analysis
    human machine interface
    pattern classification
    Opis:
    Based on recent advances in non-linear analysis, the surface electromyography (sEMG) signal has been studied from the viewpoints of self-affinity and complexity. In this study, we examine usage of critical exponent analysis (CE) method, a fractal dimension (FD) estimator, to study properties of the sEMG signal and to deploy these properties to characterize different movements for gesture recognition. SEMG signals were recorded from thirty subjects with seven hand movements and eight muscle channels. Mean values and coefficient of variations of the CE from all experiments show that there are larger variations between hand movement types but there is small variation within the same type. It also shows that the CE feature related to the self-affine property for the sEMG signal extracted from different activities is in the range of 1.855∼2.754. These results have also been evaluated by analysis-of-variance (p-value). Results show that the CE feature is more suitable to use as a learning parameter for a classifier compared with other representative features including root mean square, median frequency and Higuchi's method. Most p-values of the CE feature were less than 0.0001. Thus the FD that is computed by the CE method can be applied to be used as a feature for a wide variety of sEMG applications.
    Źródło:
    Metrology and Measurement Systems; 2011, 18, 4; 645-658
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tooth contact analysis of Novikov convexo-concave gears
    Analiza styku zębów przekładni wklęsło-wypukłych typu Nowikowa
    Autorzy:
    Markowski, T.
    Batsch, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/176126.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    tooth contact analysis
    Novikov gears
    contact pattern
    analiza styku zębów
    koła zębate Nowikowa
    ślad styku
    Opis:
    Paper presents mathematical model of convexo-concave Novikov gear mesh. The parametric equations of teeth surface and units normal were obtained. Based on condition of continuous tangency of teeth surfaces, the tooth contact analysis for both ideal gears and real ones was given. Thesis presents also the method for obtaining contact pattern, on the basis of which a number of computer simulations were carried out, aiming at examining the influence of chosen gear parameters on its contact region. The presented results simulation of meshing will be used to design the Novikov gears, which will be made and tested on the circulating power test machine.
    Opracowano matematyczny model wklęsło-wypukłego zazębienia typu Nowikowa. Określono parametryczne równania powierzchni bocznych zębów oraz równania wersorów normalnych do tych powierzchni. Przeprowadzono analizę styku zębów dla przekładni idealnej i rzeczywistej z uwzględnieniem warunku ciągłej styczności powierzchni bocznych zębów. Przedstawiono metodę wyznaczania obszaru styku, z wykorzystaniem której wykonano symulacje komputerowe. Celem symulacji jest ustalenie wpływu wybranych parametrów przekładni na jej ślad styku. Analiza wyników symulacji współpracy zębów stanowi podstawę do zaprojektowania przekładni Nowikowa. Przekładnia będzie wykonana i poddana próbie na stanowisku mocy krążącej.
    Źródło:
    Advances in Manufacturing Science and Technology; 2015, 39, 1; 53-69
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Analysis of Selected Polymer Materials for Precision Casting Models
    Autorzy:
    Jesiotr, M.
    Myszka, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382024.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    precision casting
    polymers casting pattern
    differential thermal analysis
    odlewanie precyzyjne
    wzór odlewu polimerowy
    analiza termiczna różnicowa
    Opis:
    This paper shows preliminary thermal analysis of 6 polymer materials which are commonly used or can be used as models for precision casting. Thermal analysis was carried out with use of derivatograph and allowed to determine two fundamental properties of examined materials - their phase transition during heating to the temperature of 800⁰C and mass of dry residue after burning which can be used to evaluate polymer residues remaining in the casting mould cavity. The subject of this paper is related to increasing participation of rapid prototyping methods in casting with use of printed models. Determination of changes in materials, in particular their linear and cubical expansion and analysis of dry residue after burning in casting mould cavity is extremely important for the construction of form crust and surface quality of casting. A problem is to design a polymer-based casting model which allows non-residue burning and simultaneously causes no cracking of ceramic form during heating.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2 spec.; 61-64
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of contact pattern for double enveloping worm gear
    Autorzy:
    Połowniak, Piotr
    Sobolak, Mariusz
    Marciniec, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1831346.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    globoid worm gear
    contact pattern
    CAD environment
    tooth contact analysis
    meshing simulation
    globoidalna przekładnia ślimakowa
    ślad styku
    środowisko CAD
    analiza styku zębów
    symulacja zazębienia
    Opis:
    The paper presents the method of determining geometric contact pattern by using the direct computer-aided design (CAD) method for ideal globoid worm gear in which mounting deviations are considered. The tooth contact analysis was performed for all cycle of worm rotation. Based on the results of temporary contact pattern, graphical characteristics of the contact area size depending on worm position were made. A complete analysis of the correctness of gear meshing can be obtained based on presented method. If the worm or worm wheel is incorrectly designed in terms of the geometry, the meshing simulation of CAD models can indicate the collision. Geometric contact pattern analyses were made at two pressure angles of ideal gear. The analysis of the influence of mounting deviations was done against one selected pressure angle and one gear position.
    Źródło:
    Advances in Manufacturing Science and Technology; 2020, 44, 4; 145-154
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

      Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies