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Wyszukujesz frazę "Jasinski, R." wg kryterium: Autor


Wyświetlanie 1-8 z 8
Tytuł:
Problems of the starting and operating of hydraulic components and systems in low ambient temperature Part III. Methods of determining parameters for correct start-ups of hydraulic components and systems in low ambient temperatures
Autorzy:
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/259123.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic machines
hydraulic drives
diagnostics
hydraulic systems
Opis:
More and more intensive technology development makes it possible to produce modern hydraulically driven devices which secure high reliability of operation in various conditions. To design such devices, investigations are performed, including experimental tests, which are very expensive and time consuming. In the design process of a new hydraulically driven machine or system, designers frequently have to solve problems concerning its operation in different weather conditions, for instance in low ambient temperatures. Due to the complexity of the phenomena of concern, the serviceability of the designed hydraulic component or system in those conditions is most frequently assessed based on numerical calculations, much cheaper than the experiments. The article presents three methods: experimental, analytical, and that based on computer simulation, applied for assessing the serviceability of cold hydraulic components supplied with hot working medium being a source of a so-called thermal shock.
Źródło:
Polish Maritime Research; 2009, 4; 22-31
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of the starting and operating of hydraulic components and systems in low ambient temperature (Part IV) Modelling the heating process and determining the serviceability of hydraulic components during the starting-up in low ambient temperature
Autorzy:
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/260163.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic drive
hydraulic components
thermal shock
computer simulation
Opis:
Designers of hydraulically driven machines and devices are obliged to ensure during design process their high service life with taking into account their operational conditions. Some of the machines may be started in low ambient temperature and even in thermal shock conditions (due to delivering hot working medium to cold components). In order to put such devices into operation appropriate investigations, including experimental ones - usually very expensive and time-consuming, are carried out. For this reason numerical calculations can be used to determine serviceability of a hydraulic component or system operating in thermal shock conditions. Application of numerical calculation methods is much less expensive in comparison to experimental ones. This paper presents a numerical calculation method which makes it possible to solve issues of heat exchange in elements of investigated hydraulic components by using finite elements method. For performing the simulations the following data are necessary: ambient temperature, oil temperature, heat transfer coefficient between oil and surfaces of elements, as well as areas of surfaces being in contact with oil. By means of computer simulation method values of clearance between cooperating elements as well as ranges of parameters of correct and incorrect operation of hydraulic components have been determined. In this paper results of computer simulation of some experimentally tested hydraulic components such as axial piston pump and proportional spool valve, are presented. The computer simulation results were compared with the experimental ones and high conformity was obtained.
Źródło:
Polish Maritime Research; 2017, 3; 45-57
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of the starting and operating of hydraulic components and systems in low ambient temperature (Part I)
Autorzy:
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/258562.pdf
Data publikacji:
2008
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic machines
hydraulic drives
diagnostics
hydraulic systems
Opis:
Severe winters and sweltering summers which more and more often occur nowadays are the reason why machinery designers face many difficulties when designing devices which will be serviceable in extreme ambient conditions. Hence, defining the principles and conditions of safe operation of hydraulically driven machines and devices is essential for their designers and operators. For this reasons the author did a series of tests of hydraulic component and systems in thermal shock conditions (cooled-down component were supplied with hot working medium). In such conditions, starting parameters of the selected hydraulic component and systems which secured safety of their operation were determined. The experimental tests were carried out in the laboratory of the Chair of Hydraulics and Pneumatics, Gdańsk University of Technology.
Źródło:
Polish Maritime Research; 2008, 4; 37-44
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of the starting and operating of hydraulic components and systems in low ambient temperature. Part II. Determining the clearance between cooperating elements during the hydraulic components start-up in extremely low ambient temperatures on the.
Autorzy:
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/258640.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic machines
hydraulic drives
diagnostics
hydraulic systems
Opis:
Severe winters and sweltering summers which more and more often occur nowadays are the reason why machinery designers face many difficulties when designing devices which will be serviceable in extreme ambient conditions. Hence, defining the principles and conditions of safe operation of hydraulically driven machines and devices is essential for their designers and operators. For this reasons the author did a series of tests of hydraulic component and systems in thermal shock conditions (cooled-down components were supplied with hot working medium). The experimental tests were carried out in the laboratory of the Chair of Hydraulics and Pneumatics, Gdańsk University of Technology. They gave answer to the question how the effective clearance changes in such conditions and what parameters it depends on. Based on temperature graphs acquired from tests of heating up elements of hydraulic components it is possible to determine precisely change of clearance between cooperating elements.
Źródło:
Polish Maritime Research; 2009, 1; 61-72
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Problems of the starting and operating of hydraulic components and systems in low ambient temperature (Part V) methods ensuring correct start-up of hydraulic components of ship’s onboard devices in low ambient temperatures
Autorzy:
Jasiński, R.
Powiązania:
https://bibliotekanauki.pl/articles/259768.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hydraulic drive
hydraulic components
thermal shock
computer simulation
Opis:
A large number of hydraulic devices and systems are started in low ambient temperatures. A good example of such a device is the hoisting winch on the ship. Starting hydraulic drive units in thermal shock conditions (rapid supply of hot oil to the cold unit) may lead to incorrect operation of the actuating system, for instance, due to the loss of clearance between cooperating elements. The article presents methods to prevent the disappearance of effective clearance in a hydraulic motor started in thermal shock conditions. For this reason, the structure of the hydraulic satellite motor was complemented by elements creating special channels through which hot oil could flow and additionally heat fixed parts of the motor. This solution ensures faster heating of motor housing, thus decreasing the temperature difference between the housing and the satellites during motor start-up in thermal shock conditions.
Źródło:
Polish Maritime Research; 2017, 4; 47-56
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of relations operating and ecological parameters of turbine engines
Autorzy:
Markowski, J.
Pielecha, J.
Jasiński, R.
Wirkowski, P.
Ślusarz, G.
Powiązania:
https://bibliotekanauki.pl/articles/2073658.pdf
Data publikacji:
2015
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
exhaust emissions
engine turbine
ecological parameters
operating parameters
Opis:
The article concerns the evaluation of exhaust emissions from turbine engines. The results of the work are associated with development of analytical methods useful in estimating the emissions of harmful exhaust gases during turbine engine operating conditions. The results of studies and the interdependence between emission indicators and operating parameters were pointed out. The analysis of these interdependence shows a strong similarity in the nature of changes of particular relationship in relation to the engines tested, but also shows their individuality. The article shows the direction of further work to develop methods of assessment the emissions from turbine engines during their operation. The methods developed for the analysis of ecological parameters during operation of turbine engines may be useful to implement in models of assessing pollutant emissions from maritime transport and to analyze and evaluate the impact of transport on the environment. This assessment may be important to consider, with regards to meeting the newly introduced emission standards, in accordance with the MARPOL directive, which has been in force since January of 2015.
Źródło:
Journal of Polish CIMEEAC; 2015, 10, 1; 101--115
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of methanol properties as an energy source for powering transport vehicles
Autorzy:
Markowski, J.
Pielecha, J.
Jasiński, R.
Dudek, M.
Mądry, J.
Powiązania:
https://bibliotekanauki.pl/articles/2073627.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
methanol
combustion engines
fuel cells
energy sources
operating parameters
metanol
silniki spalinowe
ogniwa paliwowe
źródła energii
parametry pracy
Opis:
Legislative activity in the field of environmental protection from harmful factors resulting from the use of various types of transport functions is aimed at reducing exhaust gas emissions among other things. This activity is to stimulate the development of transport drive systems by introducing emission limits of harmful substances in exhaust gases. These restrictions are contained within the relevant legal acts dedicated to each different mode of transport. Gradual reduction of limit values for emission standards has led the industry to change the systems generating energy used to propel their vehicles. These activities are related to the wider electrification of drive systems, which use the latest electric solutions controlled with modern electronic systems. However, the difficult problem of the energy sources and storage still remains. The article describes considerations relating to the possible use of methanol as an energy source for modern vehicles.
Źródło:
Journal of Polish CIMEEAC; 2016, 11, 1; 131--137
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Exhaust emissions evaluation for multi-role fighter aircraft operation
Autorzy:
Merkisz, J.
Markowski, J.
Pielecha, J.
Jasinski, R.
Wirkowski, P.
Slusarz, G.
Powiązania:
https://bibliotekanauki.pl/articles/2073639.pdf
Data publikacji:
2016
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
exhaust emissions
harmful compounds
aircraft operation
turbine engine
multi-role aircraft
emisje spalin
związki szkodliwe
silnik turbinowy
samolot wielozadaniowy
Opis:
Multi-role aircraft as a technical object of a certain functional purpose and operating characteristics resulting from its construction, affects the operating environment mechanically, as a source of disturbance of the medium in which it moves and chemically, by generating the emission of harmful substances resulting from the need to use consumable fuels. Operation of multi-role aircraft, in contrast to civil aircraft, is characterized by high volatility of flight data resulting from the diversity of performed tasks. Therefore it seems desirable to attempt the ecological evaluation of the drive in terms of emissions on the basis of a dedicated test for a particular group of aircraft. An attempt at such an assessment is presented in this article.
Źródło:
Journal of Polish CIMEEAC; 2016, 11, 1; 117--130
1231-3998
Pojawia się w:
Journal of Polish CIMEEAC
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-8 z 8

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