Wszystkie pola: initiation test - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Test bed studies of an engine with combustion initiation from ignition dose of fuel
Autorzy:: Sendyka, B.
Noga, M.
Powiązania:: https://bibliotekanauki.pl/articles/245825.pdf
Data publikacji:: 2011
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: two-cycle engine
compression ignition
spark ignition
total efficiency of engine
Opis:: Results of test bed studies of combustion engine with work possibility with application of spark ignition and combustion from ignition dose injected directly into the combustion chamber were described in this article. In engine working according to the patent solution of Prof. B. Sendyka, during start and work at low rotational speed and low load a system realizing spark ignition of homogenous mixture formed in classical way in the intake manifold is active. For higher rotational speeds and heavy load the ignition system is switched off whereas, injectors of ignition dose injecting fuel by the end of the compression stroke directly into the working space of the engine are activated. The fuel dose injected into the combustion chamber undergoes auto-ignition and in this way the combustion process in the whole volume of the homogenous combustion charge accumulated in the cylinder is initiated. The mass of ignition dose of fuel constitutes about 5 – 10% of the whole fuel mass per working cycle what differs decisively the presented solution from other known engines working according to similar principles. Application of two combustion system in four stroke combustion engine aims at combining the advantages of spark ignition a compression ignition engines. The engine is characterized by easy starting and during work at higher rotational speed and higher load in the mode of ignition from pilot dose exploitation efficiency of energy contained in fuel is higher than for spark ignition engine, this finds direct reflection in increase in total efficiency by over 9% as related to the base value.
Źródło:: Journal of KONES; 2011, 18, 4; 427-509
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Complex analysis of uniaxial compressive tests of the Mórágy granitic rock formation (Hungary)
Autorzy:: Davarpanah, M.
Somodi, G.
Kovács, L.
Vásárhelyi, B.
Powiązania:: https://bibliotekanauki.pl/articles/178552.pdf
Data publikacji:: 2019
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: uniaxial compressive test
modulus ratio
maximum axial strain
crack damage stress
crack initiation stress
Mórágy granite formation
Opis:: Understanding the quality of intact rock is one of the most important parts of any engineering projects in the field of rock mechanics. The expression of correlations between the engineering properties of intact rock has always been the scope of experimental research, driven by the need to depict the actual behaviour of rock and to calculate most accurately the design parameters. To determine the behaviour of intact rock, the value of important mechanical parameters such as Young’s modulus (E), Poisson’s ratio (v) and the strength of rock (σ_cd) was calculated. Recently, for modelling the behaviour of intact rock, the crack initiation stress (σ_ci) is another important parameter, together with the strain (ɛ). The ratio of Young’s modulus and the strength of rock is the modulus ratio (M_R), which can be used for calculations. These parameters are extensively used in rock engineering when the deformation of different structural elements of underground storage, caverns, tunnels or mining opening must be computed. The objective of this paper is to investigate the relationship between these parameters for Hungarian granitic rock samples. To achieve this goal, the modulus ratio (M_R = E/σ_c) of 50 granitic rocks collected from Bátaapáti radioactive waste repository was examined. Fifty high-precision uniaxial compressive tests were conducted on strong (σ _c >100 MPa) rock samples, exhibiting the wide range of elastic modulus (E = 57.425–88.937 GPa), uniaxial compressive strength (σ_c = 133.34–213.04 MPa) and Poisson’s ratio (v= 0.18– 0.32). The observed value (M_R = 326–597) and mean value of M_R = 439.4 are compared with the results of similar previous researches. Moreover, the statistical analysis for all studied rocks was performed and the relationship between M_R and other mechanical parameters such as maximum axial strain (ɛ_{a, max}) for studied rocks was discussed.
Źródło:: Studia Geotechnica et Mechanica; 2019, 41, 1; 21-32
0137-6365
2083-831X
Pojawia się w:: Studia Geotechnica et Mechanica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Comparison of Energy Absorption Properties of High Nitrogen Austenitic Steel and Cast Alloy Determined Using Low Velocity Perforation Test
Porównanie wyznaczonych w trakcie próby przebijania energochłonnych właściwości stali austenitycznej oraz staliwa o wysokiej zawartości azotu
Autorzy:: Moćko, W.
Powiązania:: https://bibliotekanauki.pl/articles/352019.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: energy absorption
austenitic steel
cast alloy
constitutive modeling
damage initiation criterion
absorpcja energii
stal austenityczna
staliwo
modelowanie konstytutywne
kryterium inicjalizacji uszkodzenia
Opis:: The results of energy absorbing analysis of VP159 austenitic steel and LH556 cast alloy were presented in this article. The assessment was carried out on the basis of drop-weight tower perforation test at impact energy equal to 500J and striker velocity equal to 12,5 m/s. Moreover, the basic mechanical properties of both tested materials were estimated in order to calibrate coefficients of the Johnson-Cook visco-plasticity model and Johnson-Cook damage initialization criterion as well. Subsequently, both models were applied for the finite element method simulation of perforation process. The reasonable agreement between measured and calculated shape of energy absorption curves were obtained for steel and cast alloy as well.
W pracy przedstawiono wyniki analizy zdolności do pochłaniania energii blach wykonanych ze stali austenitycznej typu VP159 oraz staliwa LH556. Ocenę przeprowadzono wykorzystując test przebijania wykonany z użyciem młota opadowego przy energii uderzenia 500J i prędkości iglicy równej 12,5 m/s. Dodatkowo wyznaczono także charakterystyki mechaniczne obu materiałów. Na tej podstawie dokonano kalibracji modelu lepko-plastyczności Johnsona-Cooka oraz oszacowano kryterium inicjalizacji uszkodzenia Johnsona-Cooka. Następnie modele zostały wykorzystane do symulacji procesu przebijania z użyciem MES. Zarówno dla stali jak i staliwa uzyskano dobrą zgodność pomiędzy zmierzonymi i obliczonymi krzywymi pochłaniania energii.
Źródło:: Archives of Metallurgy and Materials; 2014, 59, 1; 65-69
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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