Temat: hypothesis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Influence of lubricating oil improvers on performance of crankshaft seals
Autorzy:: Bzura, P.
Powiązania:: https://bibliotekanauki.pl/articles/260544.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: performance
scientific hypothesis
sealing systems
Opis:: This paper presents an original method for checking influence of lubricating oil improvers on performance of crankshaft seals of combustion piston engine. Crankshaft seals were tested with the use of a modified friction node of T-02 fourball apparatus in laboratory conditions. The tests were conducted according to a worked-out algorithm. Their results confirmed usefulness of the method for determining „harmful” performance of sealing systems, which makes it possible to assess operational usability of lubricating oil improvers. On the basis of an analysis of the results a scientific hypothesis saying that lubricating oil quality affects correctness of performance of crankshaft seals of combustion piston engine, was formulated. The hypothesis was verified by means of induction inference and statistical method with taking into account Fisher statistics.
Źródło:: Polish Maritime Research; 2018, S 1; 172-177
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Information about dynamics of the sea surface as a means to improve safety of the unmanned vessel at sea
Autorzy:: Przyborski, M.
Powiązania:: https://bibliotekanauki.pl/articles/259934.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: hypothesis testing
nonlinearity
sea dynamics
USV
Opis:: One of the fundamental states of the sea surface is its heave. Despite of years of the intense scientific inquiry, no clear understanding of the influence of this aspect on the dynamics of the sea environment has emerged. The separation of two nearby fluid elements which one may observed for example as a free floating of small objects on the sea surface (rescuers on the rough sea or small research vessels) is caused by the interaction of different components. On the other hand one may say that the heave of the sea is also a summary interaction of a few components describing the dynamics of the sea. Therefore it is the most important aspect, which influenced the dispersion phenomenon. This observation has important consequences for many different problems as for example conducting Search and Rescue missions and using unmanned ships. We would like to present results of our experiment focused on finding the answer to question about nature of the heave of the sea and its influence on safety of Unmanned Surface Vessels (USV).
Źródło:: Polish Maritime Research; 2016, 4; 3-7
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A probabilistic concept of load assessmentof self-ignition engines
Autorzy:: Girtler, J.
Powiązania:: https://bibliotekanauki.pl/articles/258922.pdf
Data publikacji:: 2008
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: hypothesis
load
self-ignition engine
stochastic process
Opis:: A proposal of probabilistic interpretation of loading process of self-ignition combustion engines, was presented. Probabilistic description of loading the engines was proposed with taking into account known parameters (indices) of their operation. It was demonstrated that instantaneous load of such engines can be considered a random variable. Attention was paid to the fact that the load can be taken as a multi-dimensional random variable. Engine load changes during its operation were considered as the loading process and presented in the form of a multi-dimensional stochastic process whose states are loads considered to be random variables. It was demonstrated that the loading process can be taken as the stochastic one of asymptotically independent incements, stationary and ergodic. Justification of the above mentioned features of the loading process is contained in the presented hypotheses. It was also demonstrated that in testing the load process of self-ignition engines stochastic relation between thermal and mechanical loading should be taken into account.
Źródło:: Polish Maritime Research; 2008, 2; 65-70
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Analysis of diesel oil specific heat impact for operation of the supply pump
Autorzy:: Bzura, P.
Kreft, D.
Powiązania:: https://bibliotekanauki.pl/articles/2073603.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: pump load
research hypothesis
fuel oil
hipoteza badawcza
olej smarowy
Opis:: The article describes a test rig that allows the measurement of fuel oil specific heat changes based on the cooling time of liquids. After that, by analysing the test results, a research hypothesis was created and verified. The hypothesis is that the specific heat energy of fuel oil impact the operation of the circulation pump.
Źródło:: Journal of Polish CIMEEAC; 2017, 12, 1; 15--20
1231-3998
Pojawia się w:: Journal of Polish CIMEEAC
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Comments on linear summation hypothesis of fatigue failures
Autorzy:: Szala, G.
Powiązania:: https://bibliotekanauki.pl/articles/259846.pdf
Data publikacji:: 2014
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: fatigue life calculations
summation hypothesis of fatigue failures
variable load
Opis:: This paper presents a comparative analysis of results of fatigue life calculations with the use of the linear summation hypothesis of fatigue failures (LHSUZ), confronted with experimental test results. The calculations and fatigue tests were performed for variable amplitude(VA), two-step and ten-step loading conditions , both in the low-cycle fatigue (LCF) and high-cycle fatigue ( HCF) range, for the case of C45 steel as an example. Experimental verification of the hypothesis LHSUZ did not revealed any significant influence of load level and form of load spectrum on conformity of results of the calculation by using the LHSUZ, to results of fatigue tests on C45 steel. However, it enabled to assess magnitude of a correction factor which appears in the considered linear hypothesis.
Źródło:: Polish Maritime Research; 2014, 3; 77-85
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Application of two-parameter fatigue charactersitics in fatigue persistence calculations of structural components under conditions of a broad spectrum of loads
Autorzy:: Szala, G.
Powiązania:: https://bibliotekanauki.pl/articles/260285.pdf
Data publikacji:: 2016
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: fatigue persistence
linear hypothesis of fatigue damage summation
fatigue tests
Opis:: The paper presents an original method of calculation of the fatigue persistence based on the adoption of the load spectrum in the form of a correlation table, two-parameter fatigue characteristics and the linear hypothesis of fatigue damage summation. The calculation results by the proposed method were compared with the results of fatigue tests programmed for node-seal construction. On the basis of a comparative analysis of the test results and calculations conclusions regarding the usefulness of the proposed method to evaluate the fatigue persistence of components have been reached.
Źródło:: Polish Maritime Research; 2016, 4; 138-145
1233-2585
Pojawia się w:: Polish Maritime Research
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Static strength analysis of plate structures using finite element method
Autorzy:: Zachwieja, J.
Powiązania:: https://bibliotekanauki.pl/articles/2073662.pdf
Data publikacji:: 2015
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:: theory of plates
stresses in plates
stress concentration
Huber-Mises energy hypothesis
Opis:: The paper presents the issues regarding modelling and strength calculations for the plate structures including thinwalled tanks and water tubes in steam boilers or heat exchangers subject to thermal stresses. In this case, the subject of the analysis is not the stress-strain state due to the pressure in the structure cross-section but the conditions at the interface between plate and lifting lugs used for handling tanks decommissioned due to technical and economic factors or replaced with the new ones.
Źródło:: Journal of Polish CIMEEAC; 2015, 10, 1; 155-160
1231-3998
Pojawia się w:: Journal of Polish CIMEEAC
Dostawca treści:: Biblioteka Nauki

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