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    Wyświetlanie 1-11 z 11
    Tytuł:
    Carbon Shale Combustion in the Fluidized Bed Reactor
    Autorzy:
    Olek, M.
    Kandefer, S.
    Kaniowski, W.
    Żukowski, W.
    Baron, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/779262.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    shale coal
    combustion
    fluidized bed technology
    Opis:
    The purpose of this article is to present the possibilities of coal shale combustion in furnaces with bubbling fluidized bed. Coal shale can be autothermally combusted in the fluidized bed, despite the low calorie value and high ash content of fuel. Established concentrations of CO (500 ppm) and VOC (30 mg/m3) have indicated a high conversion degree of combustible material during combustion process. Average concentrations of SO2 and NOx in the flue gas were higher than this received from the combustion of high quality hard coal, 600 ppm and 500 ppm, respectively. Optional reduction of SO2 and NOx emission may require the installation of flue gas desulphurization and de-NOx systems.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 2; 74-76
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Analysis of Riveted Lap Joint Used in Aircraft Structures
    Autorzy:
    Wronicz, W.
    Kaniowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97747.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Opis:
    The paper presents the results of FEM analysis of two rivet lap joints loaded with tension. The joint consists of two sheets with dimensions of 125x60 mm and nominal thickness of 1.2 mm made of 2024-T3 clad alloy ASNA 3012 and two rivets (fig. 1).The countersunk rivets made of PA25 alloy were used. The diameter of the rivets was 3,5 mm and angle 120º, according to the BN- 70/1121-05 standard. Due to its symmetry, only a half of the joint was analysed. Nonlinear material models were used and contact phenomena between sheets, rivets and tools were taken into account. The analysis involved the riveting process as well as tensile loading of the joint. MSC MARC software was used. The article presents the numerical analysis of the joint. The work of a rivet was studied. The results obtained up to date were discussed as well as the difficulties encountered. Experimental verification of the calculation with strain gauges is planned.
    Źródło:
    Fatigue of Aircraft Structures; 2010, 2; 106-116
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Local Phenomena During Riveting Process
    Autorzy:
    Kaniowski, J.
    Wronicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97899.pdf
    Data publikacji:
    2013
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    riveting
    fatigue
    strain gauge
    FE model
    residual stress
    airframes
    Opis:
    The paper presents experimental and numerical study of the local phenomena during the riveting process. It is commonly accepted that technological factors of the riveting process has a strong influence on the fatigue life of riveted joints. The authors analysed the papers concerned the experimental researches of the riveting force influence on fatigue life. The magnitude of the life increase caused by the riveting force increase suggests the authors that this is not only the result of beneficial stress system but the change of the joint formation mechanism has taken place. This was an inspiration to undertake more detailed researches of the riveting process. The strain progress during the riveting process has been experimentally investigated for four types of aluminium rivets used in airframes. Measurements confirm very high strains near the driven head. For some types of rivets the reversal strain signal has been recorded. Several FE model has been use to investigate the riveting process. The axisymmetric and solid models were used. The agreement of experimental and numerical results in some cases were good, in other cases the numerical models demand further development. In any calculations, the reversal strain effect has not been obtained, This suggest that it is result of the phenomenon which has not been taken into account in numerical modelling. The working hypothesis has been assumed that during the riveting process adhesive joints (called cold welding) were formed and destroyed during the process, what was the reason of the observed reversal strain signal. The authors are going to continue this investigation.
    Źródło:
    Fatigue of Aircraft Structures; 2013, 5; 66-78
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Numerical Study of Strain Progress During and After Riveting Process for Brazier Rivet and Rivet with Compensator - Squeezing Force and Rivet Type Effect
    Autorzy:
    Wronicz, W.
    Kaniowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/98024.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Opis:
    The paper presents the experimental and numerical investigation of the stress and strain field around the rivet after the riveting process. The measurements were carried out with the X-ray diffractometer and strain gauges on the sheet surface near the driven head. The axisymmetric and 3D FEM analyses of the riveting process were performed. The article presents experimental and numerical results for two types of the brazier rivets used in the Polish aerospace industry; the normal rivet (BN-70/1121-06) and the rivet with a compensator (OST 1 34040-79 1). Bare sheets made from 2024 T3 aluminium alloy with the nominal thickness of 1,27 mm and rivets with the diameter of 3 mm and 3,5 mm made from Polish aluminium alloy PA25 were used. The measurements were compared with the FEM calculations. The influence of squeezing force as well as the rivet type on stress and the strain system was investigated.
    Źródło:
    Fatigue of Aircraft Structures; 2011, 3; 166-190
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Quasi-Static Riveting Process for 90° Countersunk Rivet
    Autorzy:
    Kaniowski, J.
    Wronicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/97753.pdf
    Data publikacji:
    2012
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    aircrafts
    riveted joints
    fatigue damage
    Opis:
    Riveting is the most commonly used method of joining sheet metal components of the aircraft structure. The riveted joints are critical areas of the aircraft structure due to severe stress concentrations and effects such as fretting and secondary bending. The most spectacular and wellknown evident of this was the accident of Boeing B737 of Aloha Airline in 1988, when during the flight at altitude of 7300 m a large part of fuselage skin was removed due to explosive decompression. The investigation showed that the reason for this accident was widespread fatigue damage of riveted joints. This accident was an impulse for establishing many research programs around the world focused on fatigue of riveted joints.
    Źródło:
    Fatigue of Aircraft Structures; 2012, 4; 141-156
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Analysis of the Influence of Riveting Parameters Specified in Selected Riveting Instructions on Residual Stresses
    Autorzy:
    Wronicz, W.
    Kaniowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97979.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    riveting
    residual stress
    FEA
    simulation
    Opis:
    The riveting parameters strongly affect residual stresses induced during riveting, which in turn have an impact on the fatigue life of riveted joints. Since rivets are established as critical from the fatigue point of view, the fatigue life of riveted joints often determines the life of the whole structure. The authors were able to become acquainted with three riveting instructions (process specifications) used by the aerospace companies from western Europe. This work presents the analysis of the riveting parameters' influence on residual stresses around the rivets. The impact of the clearance between a rivet shank and a hole as well as driven head dimensions and a rivet length were investigated based on the numerical simulations. The aim of the analysis was to determine the range of stresses variation when the requirements of the riveting instructions are fulfilled. For the purposes of comparison, the calculations were performed also with the parameters as specified in the Polish industry standards. For all calculations, the geometry of the universal rivet MS20470 was used. The results show that residual stresses can vary strongly depending on the parameters in the instructions and standard requirements.
    Źródło:
    Fatigue of Aircraft Structures; 2014, 6; 63-71
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods for Global and Local FEM Analysis of Riveted Joint on the Example of the PZL M28 Skytruck Aircraft
    Autorzy:
    Wronicz, W.
    Kaniowski, J.
    Jachimowicz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/97845.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Opis:
    The paper considers some aspects of FEM modeling of riveted joints with application of shell elements and submodeling technique. Presented works were carried out within Eureka project No. E!3496 called IMPERJA. The goal of the IMPERJA project is to increase the fatigue life of riveted joints. The project assumed FEM modeling of the operating aircraft’s structure at three different complexity levels, namely considering the complete structure, a structural detail and a single riveted joint. The paper presents analyses of various rivet models and calculations of a structure and a riveted joint. In the first part examples of various rivet models were presented and usefulness of them was discussed. Influence of the following simplification was analyzed; • neglecting of rivets in a model (elements are jointed continuously) • rivet as a rigid element (MPC) • neglecting of contact phenomenon • neglecting of secondary bending. The basis of the analysis was the asymmetric butt joint model with 14 rivets. The model which took into account secondary bending and contact phenomenon was analyzed as well. In the second part, the example of analysis of riveted joint on a lower skin of the PZL M28 Skytruck aircraft wing was presented. A submodeling technique was used there. At first, part of the wing model, was built. It includes 7 ribs and 6 bulkheads between them. Boundary conditions were taken on a basis of operation data. Presence of rivets was neglected. The Linear material model was used. The purpose of this calculation was to gain accurate boundary conditions for the model of riveted joint on the middle rib. Next a shell model of chosen area was build. Boundary conditions were set on a basis of result from previous analysis. Because of large stiffness difference between part models (part of wing and riveted joint) forces, instead of displacements, were used, as boundary conditions. The nonlinear model of material was used. A contact effect, secondary bending and residual stresses were taken into account. Results from this analysis are planned to be used as boundary conditions in a calculation of single rivet with solid detailed model. The presented method allows analyzing phenomena that appear around a rivet in a real structure, during operation. Analyses were performed with MSC PATRAN and NASTRAN software.
    Źródło:
    Fatigue of Aircraft Structures; 2009, 1; 212-225
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Porównanie modelowania MES z wykorzystaniem elementów bryłowych i osiowosymetrycznych na przykładzie zamykania nitu na prasie
    Comparison of FEM modelling techniques with solid and axisymmetric elements on example of press riveting simulation
    Autorzy:
    Gadalińska, E.
    Kaniowski, J.
    Wronicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/211232.pdf
    Data publikacji:
    2010
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    zamykanie nitu
    MES (metoda elementów skończonych)
    modele bryłowe i osiowosymetryczne
    dyfraktometria rentgenowska
    naprężenia własne
    riveting process
    FEM
    solid and axisymmetric models
    X-ray diffractometry
    residual stresses
    Opis:
    W pracy porównano dwa sposoby modelowania zamykania nitu na prasie: z wykorzystaniem elementów bryłowych oraz osiowosymetrycznych. Celem pracy jest określenie, jaki jest wpływ ww. sposobów modelowania na wyniki oraz jakie posiadają one wady i zalety. Analizowano modele używane podczas aktualnie prowadzonych prac. Analizowano modele z różną gęstością siatki, przy czym dla danej gęstości siatka w modelu osiowosymetrycznym odpowiada siatce w przekroju modelu bryłowego, w płaszczyznach symetrii. Uwzględniono nieliniowe własności materiałów oraz zjawiska kontaktowe. Obliczenia prowadzono przy użyciu oprogramowania MSC MARC. Porównano uzyskane wyniki oraz czasy obliczeń dla poszczególnych modeli i wielkość plików wynikowych. Wyniki obliczeń porównano z wynikami pomiaru naprężeń wokół nitu metodą dyfrakcji rentgenowskiej.
    The paper presents comparison of FEM modelling of press riveting with solid and axisymmetric elements. The aim of the work was to determine the influence of mentioned techniques on results as well as their advantages and disadvantages. Models used in current works were analysed. Models with different mesh density were studied. For particular density, the mesh in the axisymmetric model corresponds to the mesh in a cross section of the solid model in its symmetry plane. Nonlinear material properties were taken into account as well as contact phenomena. Calculations were performed with the MSC MARC software. Results obtained for various models were compared as well as time of calculations and size of result files. Results of FEM calculations were compared with x-ray diffractometry measurements around rivets.
    Źródło:
    Biuletyn Wojskowej Akademii Technicznej; 2010, 59, 4; 379-398
    1234-5865
    Pojawia się w:
    Biuletyn Wojskowej Akademii Technicznej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wizualizacja wrzenia na mikropowierzchniach rozwiniętych
    Visulization of boiling from enhanced micro-surfaces
    Autorzy:
    Wójcik, M. W.
    Kaniowski, R.
    Mroczek, P. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/152049.pdf
    Data publikacji:
    2005
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    wrzenie
    struktura porowata
    wizualizacja
    boiling
    porous structure
    visualization
    Opis:
    Podstawę do analizy procesu wrzenia stanowi wiedza o warunkach tworzenia się pęcherzyków i ich oderwania od powierzchni wymiany ciepła. Do wizualizacji procesu w miedzianej, włóknistej strukturze porowatej, pokrywającej rurowe powierzchnie zastosowano technikę szybkiego fotografowania. Do tego celu użyto kamery cyfrowej do szybkich zdjęć FT-1 oraz kamery cyfrowej CV-M40. Badania wymiany ciepła wykonano dla zmiennych parametrów włóknistego pokrycia (porowatości i grubości) i dla dużej objętości wody destylowanej, etanolu i freonu 123. Opracowano własne oprogramowanie, pozwalające na wyznaczanie średnic Dd i częstotliwości f odrywających się pecherzy parowych. Trzeci istotny parametr wrzenia tj. gęstość ośrodków nukleacji n obliczano analizując obrazy zarejestrowane przy dłuższych czasach naświetlania. Oceniono wpływ charakterystyk pęcherzy na wartość współczynnika przejmowania ciepła.
    The knowledge of nuclei generation and departure provides the basis for boiling process analysis. High-speed photography was used in order to visualize the process in the copper, fibrous, porous structure covering pipe surfaces. The photographs were taken with a high speed camera FT-1 and camera CV-M40. Heat transfer investigations were conducted for changeable parameters of the fibrous covering (porosity and thickness) for distilled water pool boiling. The authors worked out the software which enabled them to determine diameters Dd and the frequency f the departing vapor bubbles. The third relevant boiling parameter, i.e. nucleation centers density n, was computed due to the analysis of images recorded at long exposure period. The impact of the characteristics of bubble dynamics on the value of the heat transfer coefficient was evalued.
    Źródło:
    Pomiary Automatyka Kontrola; 2005, R. 51, nr 6, 6; 31-35
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation and Experimental Verification of Residual Stresses in Riveted Joints Used in an Airframe
    Autorzy:
    Gadalinska, E.
    Wronicz, W.
    Kaniowski, J.
    Korzeniowski, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/97911.pdf
    Data publikacji:
    2010
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Opis:
    This paper presents diffraction measurements of residual stresses around the rivet, formed during the riveting process. The measurements were made with the XSTRESS-3000 diffractometer, manufactured by Stresstech Oy. The measurements were carried out on specimens made of bare sheet 2024-T3 alloy, (standard AMS-QQ-250 / 4). The measurement results were compared with the FEM simulation results. The work was performed under the EUREKA IMPERIA project E! 3496.
    Źródło:
    Fatigue of Aircraft Structures; 2010, 2; 23-36
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Numerical Study of NACA and Conventional Riveting Procedure
    Autorzy:
    Wronicz, W.
    Kaniowski, J.
    Malicki, M.
    Kucio, P.
    Klewicki, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/97783.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Lotnictwa
    Tematy:
    rivet
    NACA riveting
    fatigue
    hole expansion
    computed tomography
    Opis:
    Fatigue behaviour is one of the most important properties of modern airplanes and rivets influence it strongly. According to the literature, the NACA riveting offers a multiple increase in the fatigue life of joints. The aim of this paper is to investigate the benefits offered by the NACA riveting procedure with respect to the residual stress and strain distribution after riveting as well as rivet hole expansion. Experimental and numerical approaches were adopted. The conventional riveting with both the universal and countersunk rivets was compared with the NACA riveting. The countersunk angle and depth in the case of the NACA riveting was modified somewhat relative to the values met in the literature. For these three cases, strain gauge measurements during riveting, hole expansion measurements and FE calculations were performed. The hole expansion measurement with the use of Computer Tomography(CT) was proposed. Only the FE calculations unambiguously indicate better fatigue properties of the NACA riveting. The proposed method of hole expansion measurement requires further research to increase its accuracy.
    Źródło:
    Fatigue of Aircraft Structures; 2017, 9; 157-170
    2081-7738
    2300-7591
    Pojawia się w:
    Fatigue of Aircraft Structures
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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