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Wyszukujesz frazę "Majewski, J" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Detection damage in bearing system of jet engine using the vibroacoustic method
    Autorzy:
    Żokowski, M.
    Majewski, P.
    Spychała, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/970580.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    jet engine
    damage of bearing
    vibroacoustic method
    envelope method
    Opis:
    The article discusses typical, operational systems for monitoring vibrations of jet engines, which constitute the propulsion of combat aircraft of the Armed Forces of the Republic of Poland. After that, the paper presents the stage of installing vibration measuring sensors in the direct area of one of the jet engine bearings, which is a support system for its rotor. The article discusses results of carried out analyses of data gathered during tests of the engine in the conditions a jet engine test bed. Results of detecting damages to the bearing, using sensors built in the direct area will be presented.
    Źródło:
    Acta Mechanica et Automatica; 2017, 11, 3; 237-242
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of explicit and implicit forms of the modified point mass trajectory model
    Autorzy:
    Baranowski, L.
    Gadomski, B.
    Szymonik, J.
    Majewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/280031.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    exterior ballistics
    projectile motion
    MPMTM
    equations of motion
    projectile trajectory
    Opis:
    The article compares the results of trajectory computation for a 35 mm projectile using two forms (explicit and implicit) of the modified point-mass trajectory model. All necessary ammunition parameters (aerodynamic coefficients, dimensions, mass etc.) and initial conditions for differential equations are provided. The results of numerical integration (using non-stiff fourth-order Runge-Kutta solver) are presented in form of projectile trajectories projections onto vertical and horizontal planes. Data tables comparing both models in terms of projectile position and velocity in chosen time steps are also attached.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 4; 1183-1195
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some problems with vibroacoustic method in relation to the transmission gearbox of a military helicopter
    Autorzy:
    Majewski, P.
    Spychała, J.
    Żokowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/196884.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    transmission gear
    vibroacoustics
    gearbox
    helicopter
    przekładnia
    wibroakustyka
    skrzynia biegów
    śmigłowiec
    Opis:
    The article presents the results of a laboratory gear stage with regard to deepening its consumption. In addition, the study looked at the construction of the transmission gearbox of a military helicopter, according to the basic kinematic results of the analysis of vibroacoustic signals, in order to determine the diagnostic criteria for the assessment of the technical condition of a military helicopter’s transmission gearbox.
    Źródło:
    Zeszyty Naukowe. Transport / Politechnika Śląska; 2016, 93; 79-90
    0209-3324
    2450-1549
    Pojawia się w:
    Zeszyty Naukowe. Transport / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetoresistance and Magnetic Properties of the Double Perovskites
    Autorzy:
    Philipp, J. B.
    Majewski, P.
    Reisinger, D.
    Geprägs, S.
    Opel, M.
    Erb, A.
    Alff, L.
    Gross, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037043.pdf
    Data publikacji:
    2004
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.-y
    75.50.Cc
    75.50.Ss
    Opis:
    The magnetic double perovskite materials of composition A$\text{}_{2}$BB'O$\text{}_{6}$ with A an alkaline earth ion and B and B' a magnetic and non-magnetic transition metal or lanthanide ion, respectively, have attracted considerable attention due to their interesting magnetic properties ranging from antiferromagnetism to geometrically frustrated spin systems and ferromagnetism. With respect to application in spin electronics, the ferromagnetic double perovskites with BB'= CrW, CrRe, FeMo, or FeRe and A = Ca, Ba, Sr are highly interesting due to their in most cases high Curie temperatures well above room temperature and their half-metallic behavior. Here, we summarize the structural, magnetotransport, magnetic, and optical properties of the ferromagnetic double perovskites and discuss the underlying physics. In particular, we discuss the impact of steric effects resulting in a distorted perovskite structure, doping effects obtained by a partial replacing of the divalent alkaline earth ions on the A site by a trivalent lanthanide as well as B/B' cationic disorder on the Curie temperature T$\text{}_{C}$, the saturation magnetization and the magnetotransport properties. Our results support the presence of a kinetic energy driven mechanism in the ferromagnetic double perovskites, where ferromagnetism is stabilized by a hybridization of states of the non-magnetic B'-site positioned in between the high spin B-sites.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 1-2; 7-26
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Explicit form of the “modified point mass trajectory model” for the use in Fire Control Systems
    Autorzy:
    Baranowski, L.
    Majewski, P.
    Szymonik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200333.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ballistics
    equations of motion
    projectile path
    modified point mass trajectory model
    MPMTM
    projectile deflection
    Opis:
    The main objective of this article is to obtain equations of motion of the spin–stabilized projectile in the presence of non–constant wind. Introducing models allowing utilization of inhomogeneous wind is dictated by new possibilities created by the use of e.g. lidars in the Fire Control Systems (FCS). Constant feed of wind data can replace meteorological messages, increasing the FCS effectiveness. Article contains results of projectile flight simulations which indicate the positive effect that the derived explicit form of the model has when considering software development for modern Fire Control Systems.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 5; 1167-1175
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    35 mm ammunition’s trajectory model identification based on firing tables
    Autorzy:
    Baranowski, L.
    Gadomski, B.
    Majewski, P.
    Szymonik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/200598.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    identification
    exterior ballistics
    equations of projectile motion
    curve fitting
    drag coefficient
    identyfikacja
    ruch pocisku
    współczynnik oporu
    Opis:
    The article presents a procedure designed for identification of projectile’s trajectory model through aerodynamic coefficients estimation. The identification process is based on firing tables artificially prepared (firing tables prepared using mathematical flight model for the projectile instead of trajectories recorded on field tests) with the use of modified point–mass and rigid body trajectory models. All the necessary data, including physical parameters of the projectile and its aerodynamic characteristics are provided. The detailed results of estimation of chosen aerodynamic coefficients are presented in both visual and tabular form. The main purpose of this paper is to establish the minimum number of trajectories (as characterized in firing tables), and the permissible error of initial parameters being passed to the mathematical model that would allow the correct identification of projectile’s trajectory model.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 5; 635-643
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Explicit “ballistic M-model”: a refinement of the implicit “modified point mass trajectory model”
    Autorzy:
    Baranowski, L.
    Gadomski, B.
    Majewski, P.
    Szymonik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/202089.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ballistics
    equations of motion
    projectile path
    modified point mass trajectory model
    MPMTM
    projectile deflection
    balistyka
    równania ruchu
    lot pocisku
    Opis:
    Various models of a projectile in a resisting medium are used. Some are very simple, like the “point mass trajectory model”, others, like the “rigid body trajectory model”, are complex and hard to use, especially in Fire Control Systems due to the fact of numeric complexity and an excess of less important corrections. There exist intermediate ones - e.g. the “modified point mass trajectory model”, which unfortunately is given by an implicitly defined differential equation as Sec. 1 discusses. The main objective of this paper is to present a way to reformulate the model obtaining an easy to solve explicit system having a reasonable complexity yet not being parameter-overloaded. The final form of the M-model, after being carefully derived in Sec. 2, is presented in Subsec. 2.5.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 1; 81-89
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geochemical and acoustic evidence for the occurrence of methane in sediments of the Polish sector of the Southern Baltic Sea
    Autorzy:
    Brodecka, A.
    Majewski, P.
    Bolalek, J.
    Klusek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/48640.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    methane
    sulphate concentration
    hydrogen sulphide
    sediment
    Baltic Sea
    marine sediment
    shallow sea
    organic matter decomposition
    water parameter
    acoustic property
    Źródło:
    Oceanologia; 2013, 55, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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