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    Wyświetlanie 1-9 z 9
    Tytuł:
    Introduction to numerical analysis of directed fragmentation warheads
    Autorzy:
    Panowicz, R.
    Nowak, J.
    Konarzewski, M.
    Niezgoda, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/243275.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    finite elements method
    dynamic
    directed fragmentation warheads
    Opis:
    The aim of the paper is to presents one of the possible approaches to the numerical analysis of the behaviour of directed fragmentation war heads. These kinds of warheads consists of: metallic or composite cover, explosive material and a driven and fragmentation liner. The explosives are initiated by a booster causes driving the liner in a few milliseconds up to about 900 m/s. The liner fragments into many parts during this intensive and dynamic load. The fragments move in a cone which dimensions depend on the warheads shape and mechanical parameters of others warheads parts. All of the warheads elements are selected to meet the assumed parameters. The fragments velocity, their mass or geometric dimensions and cone angle are the most important parameters of the warheads fragments. Such a warhead, in the initial phase of the liner driving can be numerically modelled in the field of the continuum damage mechanics. Such a description is presented in other papers. This approach in a further phase of driving cause the increases of inaccuracies. Therefore, this paper proposes the use of ALE and FSI approach to describe the behaviour of the fragmentation warheads. A three-dimensional numerical model of the directed fragmentation warheads was made in the MSC Patran, and the dynamic phenomena analysis used a nonlinear finite element method implemented in the LS-Dyna program.
    Źródło:
    Journal of KONES; 2013, 20, 4; 319-325
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of destructor case type on behaviour of fragments in military vehicles active protection system
    Autorzy:
    Nowak, J.
    Panowicz, R.
    Konarzewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/243721.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    finite elements method
    simulation
    military vehicles
    directed fragmentation warheads
    Opis:
    Military vehicles active protection systems against cumulative missiles are designed to destroy the attacking missile before it hits the vehicle armour. The article presents the results of numerical studies of one of the elements of active protection system, which is the fragmentation destructor. A typical directed fragmentation warhead consists of a few parts: metallic or composite case, explosive material and fragmentation elements in the form of spheres, cylinders. The authors of this study evaluated the influence of the destructor case type – in particular material – on the effectiveness of the destructor. The effectiveness was evaluated on the basis of the maximum speed of balls. Evaluation was performed for the selected balls from each layer. Numerical calculations were performed for two materials of the case: steel and aluminum. It was assumed in simulation that the detonating material is the plastic explosive C4. The numerical analyses were based on the finite element method with the explicit time integration method implemented in the Ls-Dyna program. The interaction of solid and gaseous medium has been modelled using ALE coupling. Mechanical properties of the case were described using a simplified Johnson-Cook type material. The detonation process was described using programmed burn model approximations, and the behaviour of detonation products was described with the JWL (John, Wilkins, Lee) equation.
    Źródło:
    Journal of KONES; 2014, 21, 1; 183-187
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the influence of the finite elements mesh density on the determined shaped charge jet parameters
    Autorzy:
    Panowicz, R.
    Konarzewski, M.
    Borkowski, J.
    Milewski, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/244994.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    charge jet
    finite element method
    Euler method
    Opis:
    Article presents results of numerical analyses of the finite elements mesh density influence on the shaped charge jet stream formation process and its selected parameters. Authors considered classical shaped charge, which consists of the plastic explosive material, copper liner and aluminium case. To properly described, material properties of the liner and case of the shaped charge, the Johnson-Cook material model was used. Detonation process was described using burn model approach. Behaviour of the detonation process products was described by commonly used John-Wilkins-Lee equation of state. Due to the nature of the presented phenomenon, in which we are dealing with large strains and strain rates, for its modelling authors utilized Euler description, implemented in the LS-Dyna software. In these method material flows by the finite elements and mesh is not deformed. Such approach allows for modelling phenomena where large and very large deformations occur. Unfortunately, it can result in a destabilizing of the systems energy balance. In order to minimize dissipation processes, in calculations was used second order scheme because of the spatial variables and time. Analyses were performed in axially symmetric setup, which was possible due to the symmetry of the analysed system. Influence of the finite elements size on the process of jet stream formation and its selected parameters was analysed.
    Źródło:
    Journal of KONES; 2015, 22, 3; 329-335
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of impact of the deflector shape on effectiveness of weakening the blast wave originating from a mine or IED
    Autorzy:
    Panowicz, R.
    Nowak, J.
    Konarzewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/244439.pdf
    Data publikacji:
    2013
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    finite elements method
    simulation
    military vehicles
    deflector
    Opis:
    The situations which our forces faced during various stabilization military missions showed that light armored vehicles are not secure enough in the case of the mine or improvised explosive devices explosion. Nowadays, the primary way of protection against this type of threat is application of a V-shape bottom in the vehicle. Such a configuration of the bottom allows dissipation of explosion energy whereby the impulse, which is transmitted to the construction – the vehicle bottom or frame, has a much lower value than in the case where the bottom is flat. In the literature it is possible to find the results of model tests on an experimental laboratory test stand. These studies show that the value of the impulse which is transmitted to the structure depends on the shape of the deflector, actually on its angle. Assuming the above condition, there were performed numerical analyses of the values of the impulse transmitted to the construction for deflectors with different angles and for a variety of loads masses. The aim of the numerical analyses was to find the optimal angle of the deflector for the considered situation. In this model, the optimal value of the angle is that in which the considered value of the impulse transmitted to the construction reaches the minimum value. For this purpose, there was made a finite element model of deflector corresponding to the conditions of the experiment. The shell elements were used in this model. The model was loaded with a pressure impulse derived from the detonation of an explosive. The blast wave interaction with the structure was modeled using the fluid structure interaction. The numerical analyses were based on the finite element method with the explicit time integration method implemented in the LS-DYNA program.
    Źródło:
    Journal of KONES; 2013, 20, 2; 329-334
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Readout System and Data Processing for OCT Pachymetry
    Autorzy:
    Dziewiecki, M.
    Domański, G.
    Frey, W.
    Konarzewski, B.
    Kurjata, R.
    Marzec, J.
    Smolnik, A.
    Zaremba, K.
    Ziembicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226782.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    optical coherence tomography
    pachymetry
    optical signal detection
    Opis:
    A complete system for measurement control, signal acquisition and data processing for an OCT pachymeter is described. Moreover, dedicated data processing algorithm used for noise reduction is presented. A simple OCT scanner was built and some measurements were performed to examine the capabilities of the system.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 3; 223-230
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time Correlated Single Photon Counting System for Optical Measurements
    Autorzy:
    Trybuła, A.
    Domański, G.
    Konarzewski, B.
    Marzec, J.
    Zaremba, K.
    Kurjata, R.
    Dziewiecki, M.
    Smolnik, A.
    Ziembicki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226833.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    time correlated single photon counting
    photomultiplier tube
    optical techniques
    Opis:
    The high sensitivity time correlated single photon counting system (with photomultiplier tube) for biomedical measurements was designed and tested. Photon time of flight through a parafine wax phantom was modeled by Monte Carlo simulation and next measured by the device. Mean time delay introduced by a phantom is in a good agreement with simulation results. The results presented in this paper demonstrate the feasibility of measuring the optical response with the device.
    Źródło:
    International Journal of Electronics and Telecommunications; 2010, 56, 3; 301-306
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gain prediction theory of single foil gas electron multiplier detector
    Teoria wzmocnienia jednofoliowego detektora z gazowym powielaniem elektronów
    Autorzy:
    Domański, G.
    Szabatin, R.
    Kalenik, J.
    Jaworski, A.
    Wróblewski, P.
    Smolik, W.
    Kurjata, R.
    Konarzewski, B.
    Dziewiecki, M.
    Marzec, J.
    Zaremba, K.
    Ziembicki, M.
    Rychter, A.
    Kryszyn, J.
    Brzeski, P.
    Szmidt, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/408074.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    Gas Electron Multiplier
    ionizing radiation detector
    detektor z gazowym powielaniem elektronów
    detektor promieniowania
    Opis:
    Gain prediction theory of single foil Gas Electron Multiplier detector was developed. Gas electron multiplier (GEM) detector with single foil was developed. Soft X-ray spectra with an energy of 5.9 keV emitted by the isotope Fe-55 were measured. On this basis, the dependence of gain and energy resolution from the detector voltage was determined. The simple theory of gain dependence on various detector parameters was developed. Preliminary results of the study confirmed the potential usefulness of the GEM detector as a substitute for the multiwire proportional chamber.
    Opracowano teorię wzmocnienia jednofoliowego detektora z gazowym powielaniem elektronów. Opracowano detektor z gazowym powielaniem elektronów z pojedynczą folią. Zmierzono widmo miękkiego promieniowania X, o energii 5,9 keV, emitowanego przez izotop Fe-55. Na tej podstawie wyznaczono zależność wzmocnienia i energetycznej zdolności rozdzielczej od napięcia zasilającego detektor. Opracowano prosta teorią zależności wzmocnienia od różnych parametrów detektora. Wstępne rezultaty badań potwierdzają potencjalną przydatność detektora GEM jako substytutu wielodrutowej komory proporcjonalnej.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2017, 7, 1; 130-132
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected aspects of modelling a phenomena occurring with very large strain rates on the example of the shaped charge jet stream forming process and explosive formed projectiles
    Autorzy:
    Panowicz, R.
    Konarzewski, M.
    Borkowski, J.
    Milewski, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/245630.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    charge jet
    EFP
    finite element method
    Euler method
    Opis:
    During the process of the shaped charge jet stream formation and creation of the explosive formed projectiles, we have to deal with strain rates reaching level of 107 1/s and strains larger than in other dynamic phenomena. Therefore, the correct numerical analyses of such problems are especially demanding, both in terms of preparation of the numerical model and time needed for obtaining the solution. For their execution, both meshfree and Euler description based computational methods are used. Due to very large deformations and associated with them numerical analyses errors, computational methods based on the Lagrange description are not used. Description of the materials behaviour has to take into account influence of the strain rate in wide range of parameters. In most cases, it is realized by using in computational analyses Johnson-Cook or Steiberg-Green constitutive models. These models provide an accurate description of the material parameters not only in the wide range of strain rates, but also in large scope of strains and temperatures. Article presents results of the numerical analyses concerning the influence of selected numerical and geometric parameters of the system on the process of shaped charge jet stream formation and creation of explosive formed projectile.
    Źródło:
    Journal of KONES; 2015, 22, 3; 187-192
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dead time measurement by two-source method – optimization of measurement time division
    Pomiar czasu martwego metodą dwóch źródeł – optymizacja podziału czasu pomiaru
    Autorzy:
    Domański, G.
    Konarzewski, B.
    Kurjata, R.
    Zaremba, K.
    Marzec, J.
    Dziewiecki, M.
    Ziembicki, M.
    Rychter, A.
    Smolik, W.
    Szabatin, R.
    Brzeski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/408834.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    dead time
    count rate
    two-source method
    czas martwy
    częstość zliczeń
    metoda dwóch źródeł
    Opis:
    The article presents the analysis of the dead time measurement using two sources for a non-paralyzable detector. It determined the optimum division of count rate measurement time between both source measurement and a single source one. Results of the work can be used to optimize dead time measurement for systems which count photons or particles.
    W artykule zaprezentowano analizę pomiaru czasu martwego detektora nieparaliżowalnego metodą dwóch źródeł. Wyznaczono optymalny podział czasu pomiaru częstości zliczeń dla pomiaru jednym i dwoma źródłami. Wyniki pracy mogą być wykorzystane do optymalizacji systemów zliczających fotony lub cząstki.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 1; 64-66
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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