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    Wyświetlanie 1-3 z 3
    Tytuł:
    Influence of the Trochoidal Tool Path on Quality Surface of Groove Walls
    Autorzy:
    Waszczuk, Kamil
    Skowronek, Hubert
    Karolczak, Paweł
    Kowalski, Maciej
    Kołodziej, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/102883.pdf
    Data publikacji:
    2019
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    trochoidal milling
    tool path
    slot milling
    hard machining
    frezowanie trochoidalne
    ścieżka narzędzia
    frezowanie rowków
    obróbka twarda
    Opis:
    The article presents the results of machining materials in hardened state. In the paper, different trochoidal tool paths are compared with each other and with the conventional milling. The results of measurements show the relationship between tool path, roughness and waviness of grooves wall. The paper also presents pictures of grooves which were made. These results provide comparative material useful in the choice of the best milling strategy to the cutting process.
    Źródło:
    Advances in Science and Technology. Research Journal; 2019, 13, 3; 38-42
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental and Numerical Characterization of Thermal Bridges in Windows
    Autorzy:
    Smusz, Robert
    Bałon, Paweł
    Kiełbasa, Bartłomiej
    Rejman, Edward
    Bembenek, Michał
    Kowalski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2201883.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    window frames
    window construction
    thermal bridges
    thermography
    Opis:
    Actions aimed at improving the energy performance of buildings increase the share of heat loss through thermal bridges and windows in a building’s energy balance. This is especially true of buildings currently under construc- tion. In addition, it is known that the correct installation of windows is one of the biggest obstacles that must be overcome in order to achieve higher energy efficiency and reduce the impact of linear thermal bridges. Therefore, the study analysed, numerically and experimentally, the energy properties of PVC window frames with improved metal stiffening profiles, which were introduced to reduce the risk of window frame deformation and reduce leakage caused by faulty installation. The value of the frame thermal transmittance coefficient and the linear heat transfer coefficients were determined numerically. The simulation results showed that filling large air spaces with insulation material allowed for the reduction of the Uf frame’s thermal transmittance coefficient by over 10%. Moreover, where the window connects with the wall, there was a reduction in the linear thermal bridges’ influence on heat losses. The reduction in the linear thermal transmittance coefficient Ψ was 9.6%, 1.0%, and 3.5% for the window sill, jamb, and lintel, respectively, compared to a frame without insulation. Moreover, experimental studies were conducted on the influence of the insulation of the PVC window frame with metal closed stiffening profiles on the linear thermal bridge located at the joint with the glass. It was found that the incidence factor Itb decreased by more than 6%. Thus, there is also a positive effect on the linear thermal bridge at the joint of the glass pane with the window frame.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 1; 315--331
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stress Concentration Analysis of the Injection Pump Shaft
    Autorzy:
    Bałon, Paweł
    Świątoniowski, Andrzej
    Rejman, Edward
    Kiełbasa, Bartłomiej
    Smusz, Robert
    Szostak, Janusz
    Kowalski, Łukasz
    Powiązania:
    https://bibliotekanauki.pl/articles/102913.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    pump shaft
    diesel engine
    FEM analysis
    torque
    torsion
    pump drive shaft
    wał pompy
    silnik wysokoprężny
    analiza MES
    moment obrotowy
    skręcanie
    wał napędowy pompy
    Opis:
    The paper presents the methodology for designing the injection shaft drive for diesel engines with 2,3,4,6 and 8 cylinders as well as power from 2.5 to 52 kW per cylinder using the FEM method and experimental research. The pump is the original solution of the authors. The shaft is a basic part of the pump with a complex structure. In order to assess the state of stress in the shaft, the FEM analytical method was used and experimental tests were carried out, subjecting the shaft to torsional moment resulting from the transmitted power. Experimental studies confirmed the results of numerical calculations and the correctness of the adopted solution. The destructive tests were carried out to assess the maximum load capacity of the shaft, loading it with an increasing torque until visible plastic deformations occurred. This condition appeared at twice the moment (Ms = 602 Nm) in relation to the maximum predicted moment in operation (extreme operating conditions of the pump shaft). The theoretical studies confirmed very significant stress concentration (αk coefficient at the level of 2.63 or even 4.7), which may be the cause of fatigue cracks. It also determines the strength of the shaft and its torsional stiffness, which influences the proper functioning of the pump and ensures adequate fuel injection phases.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 2; 155-162
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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