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    Wyświetlanie 1-7 z 7
    Tytuł:
    Wykorzystanie skanera 3D do analizy uszkodzeń silników spalinowych
    Autorzy:
    Karczewski, Mirosław.
    Koliński, Krzysztof.
    Walentynowicz, Jerzy.
    Powiązania:
    Zeszyty Naukowe / Akademia Marynarki Wojennej im. Bohaterów Westerplatte 2011, nr 1(184), s. 59-66
    Data publikacji:
    2011
    Tematy:
    Urządzenia optoelektroniczne stosowanie
    Postęp techniczny
    Metody badawcze
    Silniki spalinowe
    Tłoki
    Opis:
    Rys.
    Bibliogr.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Advantages of using composite alloys for internal combustion engine pistons
    Autorzy:
    Kowalski, Mirosław
    Jankowski, Antoni
    Powiązania:
    https://bibliotekanauki.pl/articles/1833668.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    combustion engine piston
    silumins
    composite materials
    tłoki silników spalinowych
    siluminy
    materiały kompozytowe
    Opis:
    Combustion engine pistons are subject to variable mechanical and thermal loads, and to variable deformations. The article presents the possibilities of using novel composite alloys for the construction of pistons for combustion engines. The novel alloys make it possible to meet high demands, especially for highly load designs, which practically cannot be met by conventional alloys used so far. These high requirements relate to the weight of the pistons, high temperature strength, alloy crystalline structure, abrasive wear resistance, dimensional stability. The requirements for pistons have an impact on the durability of the engine's operation, the level of noise emissions; exhaust gas blow-by into the crankcase, the level of emitted toxic exhaust components, mainly hydrocarbons. The research covered metallography (chemical composition, microstructure), material strength, abrasive wear, and thermal expansion. Investigations of the alloy crystallization process during casting were carried out using the Differential Thermal Analysis (DTA) method. The castings were used for metallographic tests. The strength of the samples was tested at room temperature (20°C) and elevated temperature (up to 350°C) on a testing machine equipped with a special climatic chamber. In particular, the article presents Thermal Derivative Analysis curves and representative microstructures of conventional AlSi12 alloy and the novel composite alloy; dependence of the tensile strength versus temperature for the samples of the novel alloy with various nickel content 2% and 4 %; comparison of the tensile strength for conventional alloy and the novel alloy at ambient and 250°C temperature; comparison of abrasive wear of samples, made of novel aluminium alloy and different cast iron; course of the linear expansion coefficient versus temperature for the conventional AlSi12 alloy with incorrect heat treatment; course of the linear expansion coefficient versus temperature for one of tested silumin alloy which expansion coefficient during sample cooling is smaller than during sample heating; course of the linear expansion coefficient versus temperature for the novel composite silumin alloy, after correct heat treatment. The great benefits of using this novel alloy and the introduction of novel alloying elements (in-Situ) have been confirmed in engine research.
    Źródło:
    Archives of Transport; 2020, 55, 3; 85-94
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analyzing mechanical vibrations of an aircraft opposed piston engine
    Autorzy:
    Biały, Michał
    Grabowski, Łukasz
    Skórzyński, Bartłomiej
    Barański, Grzegorz
    Majczak, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/2097574.pdf
    Data publikacji:
    2021
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    DIAdem
    mechanical vibrations
    opposed pistons
    PZL-100
    vibroacoustics
    drgania mechaniczne
    tłoki przeciwstawne
    wibroakustyka
    Opis:
    The paper presents the results of the bench tests to measure mechanical vibrations of a new aircraft opposed piston engine with reciprocating pistons. The PLZ-100 engine is a three-cylinder, six-piston, two-shaft drive unit with a two-stroke diesel cycle. This type of engine is dedicated for powering light aircraft, e.g. autogyros. The tests were carried out on a test bench at the Lublin University of Technology. The engine was loaded with constant torque, for several fixed values of rotational speed of a crankshaft. The angle of the start of diesel injection was changed for each of the rotational speeds. The mechanical vibrations that accompanied the operation of this drive unit were recorded with three measurement transducers and a National Instruments conditioning system. Each of the transducers was mounted on a different axis of the engine. The signals were analyzed from their diagrams with the DIAdem software. The results were the diagrams of effective speed and vibration acceleration to conduct a vibration-acoustic evaluation of the PLZ-100, detect and prevent various types of defects or failures.
    Źródło:
    Combustion Engines; 2021, 60, 4; 3--7
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Casting of Combustion Engine Pistons Before and Now on the Example of FM Gorzyce
    Autorzy:
    Czerepak, Mateusz
    Piątkowski, Jarosław
    Powiązania:
    https://bibliotekanauki.pl/articles/27314155.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    castings
    silumins
    pistons
    permanent moulding
    casting machines
    surface treatment
    odlewy
    siluminy
    tłoki
    permanentne formowanie
    maszyny odlewnicze
    obróbka powierzchniowa
    Opis:
    The article discusses the most important changes in the construction of permanent mould casting machines, as well as the method of casting engine pistons and their construction on the example of Federal-Mogul (FM) Gorzyce. The system of automatic cooling of the presently used permanent mould casting machines coupled with robots which pour the liquid alloy ensures uniform crystallization of the pistons and optimal efficiency of the casting process. As a result of the necessity to improve the engine efficiency and thus reduce the fuel consumption and harmful substance emission, the construction of the pistons has changed as well. The piston castings, which are produced by gravity casting for metal moulds, have undergone a diametric transformation. Typical piston designs for gasoline and Diesel engines are shown together with the most important parts of the piston, the crown (combustion chamber) and the guide part (skirt). Depending on the type of engine, the present pistons characterize in differently shaped crown, a slimmed internal construction as well as component participation (cooling channels and ring inserts), and the piston skirts undergo surface treatment procedures.
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 2; 58--65
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparing of High-Cycle Fatigue Lifetimes in Un-corroded and Corroded Piston Aluminum Alloys in Diesel Engine Applications
    Autorzy:
    Azadi, M.
    Aroo, H.
    Parast, M. S. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079778.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bending fatigue
    corrosion fatigue
    piston aluminum alloys
    diesel engines
    immersion time
    zginanie
    zmęczenie korozyjne
    tłoki
    stopy aluminium
    silnik Diesla
    Opis:
    Diesel engine components in the combustion chamber have been exposed to cyclic loadings under environmental effects, including high temperatures and corrosive fluids. Therefore, knowing the corrosion-fatigue behavior of materials is essential for designer engineers. In this article, pure fatigue and corrosion-fatigue behaviors of the piston aluminum alloy have been experimentally investigated. For such an objective, as-cast and pre-corrosive standard samples were tested by the rotary bending fatigue machine, under 4 stress levels. Some specimens were exposed to the corrosive fluid with 0.00235 % of the sulfuric acid for 100 and 200 hours. The results showed higher weight losses for 200 hours immersion times. As another result, it could be concluded that the lifetime decreased in pre-corrosive samples for both 100 and 200 hours of the immersion time, compared to that of as-cast specimens. However, such a lifetime reduction was more significant for 200 hours of the immersion time, especially within the high-cycle fatigue regime (or lower stress levels). Under high stress levels, both pre-corrosive sample types had almost similar behaviors. The field-emission scanning electron microscopy images of specimen fracture surfaces indicated that the brittle region of the fractured surface was larger for specimens after the 200 hours of corrosion-fatigue testing than the other specimen.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 89-94
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Iron Phases Crystallization on the Durability of the Bimetallic Connection Between Ring Inserts and the Piston Casting
    Autorzy:
    Szucki, Michał
    Piątkowski, Jarosław
    Czerepak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/27314162.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    crystallization
    Al-Si alloys
    iron phases
    pistons
    automotive industry
    krystalizacja
    stopy Al-Si
    fazy krystalizacji
    tłoki
    przemysł motoryzacyjny
    Opis:
    The article presents the most important causes of the unstable connection between cast iron ring inserts and the silumin casting of an engine piston. It is shown that manufacturing defects are mainly related to the alfin processing of inserts in Al-Si alloy (the so-called AS9 alloy). Exceeding the permissible iron content in AS9 alloy causes the crystallization of brittle -Al5FeSi phases. Their unfavorable morphology and large size are the main reasons for the weakening of the diffusion connection between the inserts and the piston, causing an unacceptable proportion of defective products. The study presented in this work was conducted under industrial conditions on a population of 10.000 pistons. Quality control data, production parameters, as well as the micro- and macro-structures of the cast iron inserts, and the interface area between the inserts and the silumin piston, were analyzed. Material and technological solutions have been proposed to reduce the occurrence of casting defects at the insert-piston joint. This includes the introduction of so-called "morphological correctors" of the -Al5FeSi phases, reducing the possibility of gaseous impurities in the AS9 alloy and optimizing the temperature of the alfin alloy.
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 2; 112--118
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selection of the Technological Ceramic Layer Thickness in an HPDC Machine Plunger in the Aspect of its Strength
    Autorzy:
    Jankowski, Jacek
    Kołakowski, Dariusz
    Pisarek, Bogusław
    Powiązania:
    https://bibliotekanauki.pl/articles/102039.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    plungers
    HPDC machine
    thermal stresses
    axially symmetrical thermal stress state
    tłoki
    maszyna HPDC
    naprężenia termiczne
    stan naprężenia termicznego symetryczny osiowo
    Opis:
    A way of selecting the ceramic coating thickness concerning the axially symmetrical thermal stresses in a casting machine plunger with a horizontal shot sleeve was discussed. Application of a technological ceramic outer layer in the plunger enhances its tribological properties. The condition that stresses in tension in the outer ceramic layer are lower than the tensile strength was proposed as a selection criterion.
    Źródło:
    Advances in Science and Technology. Research Journal; 2020, 14, 4; 11-20
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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