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    Wyświetlanie 1-11 z 11
    Tytuł:
    Identification of the parameters of multi-mass direct drive system
    Autorzy:
    Łuczak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811899.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    identification of the mechanical
    resonance frequencies
    spectral analysis
    Fourier transform
    chirp signal
    sine signal
    Opis:
    This paper presents methods for the identification of mechanical resonance of multi mass direct drive system. Methods have been applied in the field of digital signal processing. Was used spectral analysis to identify the mechanical resonance frequencies of direct drive with elastic connection. Discussed methods of identification have been verified by simulation and real system. Two different input signal was presented: sine and chirp wave. Both input signals gave good result for determine mechanical resonance frequencies, however sine wave with variable frequency determined only for the number of frequency corresponding to the input signal frequency gave better result for determine mechanical antyresonance frequencies.
    Źródło:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały; 2012, 66, 32; 62-66
    1733-0718
    Pojawia się w:
    Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Digital filter tuned according to spectral analysis of direct drive to reduce mechanical resonance effect
    Autorzy:
    Łuczak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/97189.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    digital filter
    mechanical resonance
    filter
    Opis:
    Review of the filter structures and spectral analysis algorithms was done. Digital filters allow filtering the speed signal in control loop of direct drive with a mechanical resonance. The analogue filter equations were transformed into digital filters to enable tune them in real time. Spectral analysis with additional algorithm allows to determine the mechanical resonance frequency of multi-mass system. Determination of resonance frequencies allow for proper tune the digital filter. This paper presents selected algorithms of determine signal spectrum. In order to determine the mechanical resonance frequency from the whole spectrum, it is require to use an additional algorithm that was omitted from the consideration. Filters were tuned according to frequency characteristics of the object.
    Źródło:
    Computer Applications in Electrical Engineering; 2012, 10; 194-204
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remote laboratory with WEB interface
    Autorzy:
    Łuczak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/97363.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    WEB interface
    remote laboratory
    remote control
    HTTP
    WWW
    Opis:
    Presentation of selected structures of remote laboratory. The presented structure enables remote control through the Internet and the acquisition of measurement data. The measurement data are presented using a web interface. The final result is microcontroller measuring and control system with web server. System flexibility and ease of access to its resources allow parallel planning an experiment to multiple users simultaneously.
    Źródło:
    Computer Applications in Electrical Engineering; 2011, 9; 257-268
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Object-oriented DSP implementation of neural state estimator for electrical drive with elastic coupling
    Autorzy:
    Łuczak, D.
    Wójcik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/376260.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    state observers
    DSP
    object-oriented programming technique C++
    electric drive
    elastic coupling
    dual-mass system
    Opis:
    The study presents results and procedure of object-oriented and test-driven implementation of neural-network-based state estimator. The presented algorithm has been developed for estimation of the state variables of the mechanical part of electric drive with elastic coupling. Estimated state variables – load speed and shaft stiffness torque – can be used in speed control process for reducing mechanical vibrations of working machine. The basic objective was to create a simple, extensible and readable program code, performing the task of state estimation of the considered system. The target platform is a DSP (Digital Signal Processor) from SHARC (Super Harvard architecture Single-Chip Computer) family, which allows for hardware acceleration of matrix operations. The IDE (Integrated Development Environment) available for the selected platform made it possible to write program in C++. The usage of UML (Unified Modelling Language) in the development of control software was discussed.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 91; 395-406
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Neural state estimator for complex mechanical part of electrical drive: neural network size and performance of state estimation
    Autorzy:
    Łuczak, D.
    Wójcik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193680.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    two-mass drive
    neural network
    simulation studies
    non-linear state estimation
    Opis:
    This paper presents the results of simulation research of an off-line-trained, feedforward neural-network-based state estimator. The investigated system is the mechanical part of an electrical drive characterised by elastic coupling with a working machine, modelled as a dual-mass system. The aim of the research was to find a set of neural network structures giving useful and repeatable results of the estimation. The mechanical resonance frequency of the system has been adopted at the level of 9.3-10.3 Hz. The selected state variables of the mechanical system are load, speed and stiffness torque of the shaft.
    Źródło:
    Power Electronics and Drives; 2018, 3, 38; 205-216
    2451-0262
    2543-4292
    Pojawia się w:
    Power Electronics and Drives
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Filtration of digital signals using wavelets
    Autorzy:
    Łuczak, D.
    Skrzypiński, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/376402.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    wavelet transform
    on-line filtering
    Gaussian noise
    digital signal
    Opis:
    The article constitutes a set of research referring to the removal of the noise of Gaussian distribution of signal using wavelet analysis. The thesis has been launched of presentation of existing analysis algorithms, starting of discrete transform related to Mallat’s algorithm, and ending with the selected methods on inverse wavelet transform. The task was carried out by using the simulation scripts of package Wavelet Toolbox in MATLAB. The studies of using on-line filtering algorithms has been undergone. The delay value, which was implemented by the various filtration methods, was determined through simulations. The inclusion of the comparison of results allows to evaluate the quality of filtration.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 85; 187-195
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Similarity-based web clip matching
    Autorzy:
    Baczkiewicz, M.
    Łuczak, D.
    Zakrzewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/206071.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    information extraction
    web
    web content integration
    Opis:
    The research areas of extraction and integration of web data aim at delivery of tools and methods to extract pieces of information from third-party web sites and then to integrate them into profiled, domain-specific, custom web pages. Existing solutions rely on specialized APIs or XPath querying tools and are therefore not easily accessible to non technical end users. In this paper we describe our new comprehensive, non-XPath integration platform which allows end users to extract web page fragments using a simple query-by-example approach and then to combine these fragments into custom, integrated web pages. We focus on our two novel similarity-based web clip matching algorithms: Attribute Weights Tree Matching and Edit Distance Tree Matching.
    Źródło:
    Control and Cybernetics; 2011, 40, 3; 715-730
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low-range tilt sensing with mems accelerometers
    Autorzy:
    Łuczak, S.
    Kołodziej, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/385200.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    MEMS
    accelerometer
    tilt
    accuracy
    Opis:
    Ways of adjusting MEMS accelerometers for tilt measurements over a small angular range of few degrees arc or less are considered with regard to achieving a possibly high accuracy. The paper describes some additional mechanical structures applied to overcome the problem of incompatibility between the large measuring range of MEMS accelerometers and the expected small angular measuring range.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2009, 3, 4; 93-95
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using Clustering Methods for the Identification of Acoustic Emission Signals Generated by the Selected Form of Partial Discharge in Oil-Paper Insulation
    Autorzy:
    Borucki, S.
    Łuczak, J.
    Zmarzły, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/177657.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic emission method
    acoustic signals
    partial discharges
    insulation
    power transformer
    Opis:
    The article presents the results concerning the use of clustering methods to identify signals of acoustic emission (AE) generated by partial discharge (PD) in oil-paper insulation. The conducted testing featured qualitative analysis of the following clustering methods: single linkage, complete linkage, average linkage, centroid linkage and Ward linkage. The purpose of the analysis was to search the tested series of AE signal measurements, deriving from three various PD forms, for elements of grouping (clusters), which are most similar to one another and maximally different than in other groups in terms of a specific feature or adopted criteria. Then, the conducted clustering was used as a basis for attempting to assess the effectiveness of identification of particular PD forms that modelled exemplary defects of the power transformer’s oil-paper insulation system. The relevant analyses and simulations were conducted using the Matlab estimation environment and the clustering procedures available in it. The conducted tests featured analyses of the results of the series of measurements of acoustic emissions generated by the basic PD forms, which were obtained in laboratory conditions using spark gap systems that modelled the defects of the power transformer’s oil-paper insulation.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 207-215
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soluble carbohydrates in cereal [wheat, rye, triticale] seed after storage under accelerated ageing conditions
    Autorzy:
    Piotrowicz-Cieslak, A I
    Niedzielski, M.
    Michalczyk, D J
    Luczak, W.
    Adomas, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/59350.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    soluble carbohydrate
    carbohydrate
    cereal
    wheat
    rye
    triticale
    seed
    storage
    aging
    moisture content
    Opis:
    Germinability and the content of soluble carbohydrates were analysed in cereal seed (winter rye, cv. Warko; spring wheat, cv. Santa; hexaploid winter triticale, cv. Fidelio and cv. Woltario). Seed moisture content (mc) was equilibrated over silica gel to 0.08 g H2O/g dry mass and stored in a desiccator at 20oC for up to 205 weeks or were equilibrated to mc 0.06, 0.08 or 0.10 g H2O/g dm and subjected to artificial aging at 35oC in air-tight laminated aluminium foil packages for 205 weeks. It was shown that the rate of seed aging depended on the species and seed moisture content. The fastest decrease of germinability upon storage was observed in seed with the highest moisture level. Complete germinability loss for winter rye, winter triticale cv. Fidelio, winter triticale cv. Woltario and spring wheat seed with mc 0.10 g H2O/g dm3 occurred after 81, 81, 101 and 133 weeks, respectively. Fructose, glucose, galactose, myo-inositol, sucrose, galactinol, raffinose, stachyose and verbascose were the main soluble carbohydrates found in the seed. The obtained data on the contents of specific sugars and the composition of soluble sugars fraction in seed of rye, wheat and triticale did not corroborate any profound effect of reducing sugars, sucrose and oligosaccharides on seed longevity.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2010, 79, 1; 21-25
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The search for new biological activities for selected insect peptides
    Autorzy:
    Kuczer, M.
    Dziubasik, K.
    Luczak, M.
    Majewska, A.
    Kamysz, W.
    Saniewska, A.
    Konopinska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/55140.pdf
    Data publikacji:
    2008
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    antitumour peptide
    antifungal activity
    antiviral peptide
    oostatic peptide
    antiviral activity
    Phoma narcissi
    Botrytis tulipae
    colony growth
    biological property
    antimicrobial activity
    insect peptide
    biological activity
    insect
    peptide
    Opis:
    New biological properties of selected insect peptides are presented. The subjects of the investigation included insect oostatic peptides, like Neb-colloostatin (I) and Neb-TMOF(II), and/or insect peptides with antiviral or antitumor activity, such as alloferon (III) and its analogues modified at position 1 of the peptide chain. In the study was also included the oligopeptide Any-GS (VII) and its truncated analogues. The peptides were tested for antimicrobial activity on a series of bacterial species, antiviral activity against Human Herpes Virus type 1 (HHV-1) in vitro using a Vero cell line, and the growth and development of plant pathogens Phoma narcissi and Botrytis tulipae. The results of the biological investigations indicate that among the peptides investigated, compounds VII and IX inhibit the growth of plant pathogens P. narcissi and B. tulipae, whereas compounds I and II stimulate the mycelium growth of the aforementioned pathogens. Other peptides show slow antimicrobial activity but do not inhibit the replication of HHV-1 in Vero cells.
    Źródło:
    Pestycydy; 2008, 1-2; 5-11
    0208-8703
    Pojawia się w:
    Pestycydy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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