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    Wyświetlanie 1-9 z 9
    Tytuł:
    Analytical time-domain model for tool point dynamics in turning
    Autorzy:
    Berglind, L.
    Ziegert, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/99687.pdf
    Data publikacji:
    2014
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    chatter
    turning
    analytical model
    time domain
    Opis:
    An analytical time domain solution is developed to model the dynamic response of a tool during a simple turning operation. The time domain solution developed in this paper relies on the superposition principal under the linear assumption to construct the time response of single mode, single degree of freedom cutting tool. The results from the analytical solution are compared with those generated using numerical time domain simulations and it is found that the two solutions converge as the time step used in the numerical simulation decreases.
    Źródło:
    Journal of Machine Engineering; 2014, 14, 4; 75-94
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time and frequency domain analysis of partial discharges using electrical method
    Autorzy:
    Kunicki, M.
    Cichoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/973070.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    partial discharges
    electrical method
    IEC 60270
    frequency domain
    time domain
    Opis:
    Partial discharge (PD) measurement results with particular consideration of time domain and frequency domain analysis of pulses generated by PD model sources are presented in the paper. Three different PD generation model sources are selected for the research: surface type, point to point and multi-point to plate. All measurements are proceeded under laboratory conditions using electrical method of a PD detection, according to the IEC60270 standard. Various amplitude and power density spectrum descriptors are proposed, as well as PD source type identification abilities on grounds of the selected descriptors are considerated. Electrical power transformers on-line PD detection and evaluation systems improvement and development are the main purpose of the presented research. Laboratory experiment results gives a solid base for further research focused on verification of the proposed methodology on a real life apparatus.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 2; 72-77
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An introduction to envelope constrained filter design
    Autorzy:
    Cantoni, A.
    Vo, B.N.
    Teo, K.L.
    Powiązania:
    https://bibliotekanauki.pl/articles/309513.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    filter
    optimisation
    constraints
    envelopes
    time domain
    noise
    robustness
    Opis:
    Envelope constrained filter design is concerned with the time domain synthesis of a filter whose response to a specified input signal stays within prescribed upper and lowe bounds and in addition has minimal noise enhancement. In many practical applications, a "soft" approach, such as least mean square, is not the most suitable and it becomes necessary to use "hard" constraints such as the ones considered in the paper. We present an overview of key ideas related to robust continuous time envelope constrained filter design.
    Źródło:
    Journal of Telecommunications and Information Technology; 2001, 3; 3-14
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combination of criteria for controller parameterisation in the time and frequency domain by simulation-based optimisation
    Autorzy:
    Hipp, K.
    Uhrig, M.
    Hellmich, A.
    Schlegel, H.
    Neugebauer, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/99661.pdf
    Data publikacji:
    2016
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    simulation based optimisation
    optimisation criteria
    controller parameterisation
    frequency domain
    time domain
    Opis:
    The position controller cascade is widely used in standard industrial controllers. Its controller parameterisation is commonly performed by either applying basic tuning rules or by carrying out not comprehensible design automatisms.In this paper an alternative approach to parameterise the cascade in one step is presented. It bases on established methods within the field of optimisation research specifically the so-called simulation-based optimisation (SBO), which can also handle non-linear models and various constrains. Own research showed, that criteria in the time domain as well as in the frequency domain are suitable optimisation criteria. However, both types have individual advantages and disadvantages. Therefore, in this research, selected representatives from both types were combined as new multi-objective optimisation criteria and investigated according to their performance. Investigations were performed for a test rig model (third order transfer function plus dead time and friction).The paper presents fundamentals of the SBO and a description of the optimisation criteria, obtained results as well as their verification on the test rig. Also, the derived controller parameterisations are compared to the integrated tuning automatism.
    Źródło:
    Journal of Machine Engineering; 2016, 16, 4; 70-81
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    L1-impulses method as an alternative method of harmonic components in the power theory of discrete time systems
    Autorzy:
    Siwczyński, M.
    Drwal, A.
    Żaba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/201087.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    L1-impulses
    time-discrete L1 impulses operational method
    time domain
    Opis:
    The article presents the basic mathematical theory of the operational calculus of the L1-impulses in the discrete time domain. It presents the isomorphism between the rational function set of complex variable and the exponential L1 impulses set of positive and negative time domain. The paper shows how for any factorization of the rational function consisting of casual and noncasual parts can be directly obtained the N – periodic version of the original signal using for the individual components of the L1 impulses N – copy formula. It is done by the distribution of the convolution – the type admitance operator Y of electrical circuit to the two commutative convolution operators and on this basis is obtained the distribution of electrical circuit current to two components: the active current and the reactive current in the discrete time domain using the cyclic convolutions. The distribution of current in the time domain for signals significantly different from the sinusoidal is much more favorable than the distribution in the frequency domain.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 111-117
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The wave transformer – analysis and application of time digital filters and the integral-derivative operators of ½ order
    Autorzy:
    Siwczyński, M.
    Drwal, A.
    Żaba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/141515.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wave transformer
    integral-derivative operators of fractional order
    convolution operators
    time domain
    digital filters
    Opis:
    In this paper the way of modeling phenomena occurring during the voltage and current waves passing through a point connection of two lines, with different wave impedance operators, is presented. This connection point is called „the wave transformer”. The analyzes and the resulting formulas concern not the frequency domain, but the time domain. The appropriate transition matrices of waves through the wave transformer are defined. This matrices are the convolution integral-derivative operators of fractional order (the digital filters). For a lossless line the wave transition matrices through the wave transformer become number type instead of operator type. All matrix multiplications occurring in the formulas should be understood in convolution way.
    Źródło:
    Archives of Electrical Engineering; 2013, 62, 3; 497-504
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study of nano-composite materials on vibration responses
    Autorzy:
    Mobark, Haidal Faisal Helal
    Fahdel, Essam Z.
    Hussein, Mustafa Turki
    Mohamad, Barhm
    Powiązania:
    https://bibliotekanauki.pl/articles/13800132.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    nanocomposite
    time domain
    mechanical properties
    cantilever beam
    finite element method
    nanokompozyt
    właściwości mechaniczne
    metoda elementów skończonych
    belka wspornikowa
    Opis:
    This paper present of experimental and numerical study of nano Al2O3 cantilever beam for forced vibration, addressing an unexplored area in the existing literature. The proposed nano composite cantilever beam is modeled with hole and crack. The study is based on history loading calculation and composite morphology a global parameter, the transverse crack in nano composite cantilever beam was studied and analyzed experimentally using a four-channel dynamic signal acquisition (NI 9234) module for making high-accuracy measurements and its ideal for vibration applications. The relationship between the dispersion and interaction of the alumina nanoparticles within the cantilever beam and morphology of the solid, hole and crack composite has been identified. Furthermore, the influence of particles Al2O3 at different concentrations (0%, 1%, 3% and 4%) have been studied respectively. Supporting results proved that the crack and hole depth increases with increases of history loading. Nanoparticles dispersed within the specimen can increase energy dissipation during vibration, leading to improved damping characteristics. For future work, it is recommended to utilize statistical frequency domain input, such as Power Spectral Density (PSD), for assessing the structural response instead of employing time history loading.
    Źródło:
    Diagnostyka; 2023, 24, 3; art. no. 2023312
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rapid design exploration of low pass highly efficient single loop single bit sigma delta (ΣΔ) modulators
    Autorzy:
    Krishna, S. Vamsee
    Reddy, P. Sudhakara
    Reddy, S. Chandra Mohan
    Powiązania:
    https://bibliotekanauki.pl/articles/38699542.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    sigma delta modulator
    single loop
    time domain
    virtual instrument
    biomedical application
    modulator sigma delta
    pojedyncza pętla
    dziedzina czasu
    instrument wirtualny
    zastosowanie biomedyczne
    Opis:
    A rapid design and verification of sigma delta modulators are presented at the systemlevel with high accuracy and computational efficiency. Sigma delta analog to digital converters showcased an excellent choice for low bandwidth applications from near DC tohigh bandwidth standard 5G applications. The conceptualization of the graphical userinterface (GUI) in the efficient selection of integrator weights has been proposed, whichsolves various tradeoffs between various abstraction levels. The sigma delta modulator of the 5th order is designed and simulated using the proposed design methodology of calculating integrator weights for targeted specifications. The efficiency of design explorationand optimum selection of integrator coefficients has been investigated on single loop architectures. Power and performance of the selected modulator has been verified in the timedomain behavioral simulation. The discrete time circuit technique has been adopted fordesign of distributed feedback, feed forward architectures and comparison of performancemetrics done between selected architectures. A huge design space is computed for the bestdesign parameters that offers ultra-low power and high performance. The proposed virtual instruments supported the methodology for designing delta sigma modulators at thesystem level achieving SNDR of 122 dB over a bandwidth of 5 kHz at a clock frequencyof 1 MHz.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2023, 30, 1; 27-39
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New Textiles Designed for Anti-Radar Camouflage
    Nowe konstrukcje włókiennicze maskujące przeciwradiolokacyjnie
    Autorzy:
    Redlich, G.
    Obersztyn, E.
    Olejnik, M
    Fortuniak, K
    Bartczak, A
    Szugajew, L
    Jarzemski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/232241.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    woven fabric
    knitted fabric
    anti-radar camouflage
    reflection coefficient
    transmission coefficient
    time domain
    microwave measurements
    tkaniny
    dzianiny
    kamuflaż anty-radar
    współczynnik odbicia
    współczynnik transmisji
    pomiary mikrofalowe
    Opis:
    This paper presents newly designed textiles (woven and knitted fabrics) for camouflage against radar, with a particular emphasis on the conductive yarns applied and their distribution throughout the structure of the goods. The levels obtained for the coefficients of re- flection and the transmission of electromagnetic waves have been discussed for woven and knitted fabrics, both raw and those subjected to finishing treatment. These parameters were determined using two methods: waveguide applicators and in the space in a semi-anechoic chamber within the time domain. The issues this publication covers are an integral part of research on developing textile products featuring a broad spectrum of masking, i.e. within the visible (VIS), near infrared (IR), and that of the subject - the anti-radar band. The first two types of camouflage were discussed in an earlier publication entitled “Assessment and Verification of the Functionality of New, Multi-component, Camouflage Materials” (Fibres & Textiles in Eastern Europe 2013; 21, 5(101): 73-79).
    W artykule przedstawiono nowoopracowane konstrukcje włókiennicze (tkaniny, dzianiny) maskujące przeciwradiolokacyjnie, ze szczególnym uwzględnieniem zastosowanych przędz konduktywnych oraz ich rozkładu w strukturze wyrobów. Omówiono poziomy uzyskanych wartości współczynników odbicia i transmisji fal elektromagnetycznych, zarówno dla tkanin i dzianin surowych, jak i poddanych obróbce wykańczalniczej. Parametry te były wyznaczane z zastosowaniem dwóch metod tj. z wykorzystaniem aplikatorów falowodowych oraz w przestrzeni w komorze bezechowej w domenie czasu. Zagadnienia ujęte w niniejszej publikacji stanowią integralną część badań nad opracowaniem wyrobów włókienniczych o szerokim spektrum maskowania, tj. w zakresie widzialnym (VIS), bliskiej podczerwieni (IR) oraz przedmiotowym czyli przeciwradiolokacyjnym. Dwa pierwsze rodzaje maskowania zostały przedstawione we wcześniejszej publikacji pt. „Assessment and verification of functionality of new, multi-component, masking materials ”(Fibres & Textiles in Eastern Europe 2013; 21, 5(101): 73-79).
    Źródło:
    Fibres & Textiles in Eastern Europe; 2014, 1 (103); 34-42
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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