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Wyszukujesz frazę "Litwin, W." wg kryterium: Autor


Tytuł:
Water-lubricated bearings of ship propeller shafts - problems, experimental tests and theoretical investigations
Autorzy:
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/259105.pdf
Data publikacji:
2009
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
bearing
water-lubricated bearings
propeller shaft bearing
Opis:
In recent years can be met ships whose propeller shaft polymer bearings are lubricated with water. It results from simplicity and associated low cost of such solution which is also environmentally friendly as no risk of pollution is involved. However the solution is not free of disadvantages. The main problem is intensive wear of bush material, occurring in certain cases. It very often results from errors of improper design and machining and mounting operations. Another problem is a limited value of its hydrodynamic load-carrying capacity, resulting from low viscosity of water used as a lubricating medium. As results from the performed research investigations, bearing of the kind is a highly sensitive unit. Problems of choosing a suitable bearing clearance, designing an optimum bush geometry, selecting a proper bush material are crucial for lifitime of the bearing.
Źródło:
Polish Maritime Research; 2009, 4; 42-50
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of local bush wear on properties of water lubricated marine stern tube bearings
Autorzy:
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/259292.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
water-lubricated bearing
bearing systems
propeller shaft bearing systems
Opis:
In recent years more and more frequently can be met ships in which propeller shaft water-lubricated polymer bearings have been applied. It results from their simplicity and associated relatively low initial and operational cost as compared with the complex classical sealed system based on oil-lubricated bearings. It is worth mentioning that the water-lubricated bearings are also environmentally friendly as no risk of pollution with lubricating oil used in classical systems, is involved. Design procedure of bearings in question based on materials available from their producers is relatively simple. However the calculating of such bearings creates many problems. For calculating the hydrodynamic lubricating theory is as a rule used and elastic bush flexibility taken into account. In the case of greater loads when lubricating film is very thin to achieve a proper solution is very difficult. For this reason is proposed a novel method in which bush local wear effect can be accounted for. Such phenomenon has been observed during experimental tests of heavy-loaded water-lubricated slide bearings. With the use of the applied calculation algorithm bush local wear close to its edges can be taken into account, and - in consequence - a greater bearing capacity can be achieved.
Źródło:
Polish Maritime Research; 2011, 1; 32-36
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of main design parameters of ship propeller shaft water-lubricated bearings on their properties
Autorzy:
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/259397.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
water lubrictaed bearings
stern tube bearings
sliding bearings
Opis:
In recent years more and more frequently can be met ships in which propeller shaft water-lubricated polymer bearings have been applied. It results from their simplicity and associated relatively low initial and operational cost as compared with the complex classical sealed system based on oil-lubricated bearings. It is worth mentioning that the water-lubricated bearings are also environmentally friendly as no risk of pollution with lubricating oil used in classical systems, is involved. Design procedure of bearings in question based on materials made available by producers is relatively simple. However it turns out that choice of an appropriate sliding material, clearance value and optimum arrangement of lubricating grooves may greatly influence bearing’s properties. As results from the performed research investigations, bearing of the kind is a highly sensitive unit. Problems of choosing a suitable bearing clearance, designing an optimum bush geometry, selecting a proper bush material are crucial for life time of the bearing. In particular the problem is in forming hydrodynamical properties of bearing as owing to its operation in the fluid friction regime durability of bearings, the very responsible units of propulsion transmission system, can be greatly extended.
Źródło:
Polish Maritime Research; 2010, 4; 39-45
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of possible application of waterlubricated sintered brass slide bearing for marine propeller shaft
Autorzy:
Litwin, W.
Olszewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/260629.pdf
Data publikacji:
2012
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
bearing
bearing of ship propeller shafts
tribology
water-lubricated bearings
Opis:
Water-lubricated bearings have been applied to support ship screw shafts for over a hundered years. Development of plastic materials has caused that novel sliding polymers appeared available on the market and being approved by classification institutions, possible to be applied in shipbuilding. However in the subject – matter literature there is no reference to application of bearings fitted with metal or ceramic bushes in shipbuilding. Nevertheless they have important merits such as low resistance to motion, long service life or stability of form. But some doubts are evoked by their large value of shape elasticity module which can lead to local stress concentration at the bush edges in the case of non-axiality of bush and shaft axes. Hence this work has been aimed at the testing of a bearing made of bronze-graphite silter. In the work is presented a comparison of measurement results of resistance to motion , hydrodynamic pressure distributions in lubricating film as well as shaft axis trajectories of the bearing, with those made for a typical elastic polymer bearing. The measurement results have showed high quality of the tested material. In the opinion of these authors it could be applicable to bearing ship propeller shafts.
Źródło:
Polish Maritime Research; 2012, 4; 54-61
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Attempt at evaluating the influence of bending stress on shaft wear processes in water lubricated sliding bearing with a rubber bushing
Próba oceny wpływu naprężeń zginających na proces zużycia czopa w łożysku ślizgowym smarowanym wodą z gumową panwią
Autorzy:
Piątkowska, E.
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/190775.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
smarowanie wodą
łożyska gumowe
zużycie
water lubrication
rubber bearings
wear
Opis:
Water lubricated bearings find increasingly wide application in shipbuilding or the hydropower industry, with the popularity stemming from their numerous advantages. Unfortunately, as it turns out, water lubricated bearings do not always meet expectations, because, on occasion, they become subject to intense, premature wear, which requires costly repair. One of the still unexplained phenomena is the process of excessive bearing wear, in particular, that of shaft journal co-working with rubber bushings. The research goal was to evaluate the influence of shaft bending stress on the degree of its wear. Experimental tests were carried out on a purpose-designed test stand. The results of the first test series confirmed that the shaft bending stresses do have impact on the magnitude of wear.
Łożyska smarowane wodą coraz powszechniej stosowane są w okrętownictwie czy energetyce wodnej. Wynika to z wielu zalet takiego rozwiązania. Niestety okazuje się, że nie zawsze łożyska smarowane wodą są w stanie sprostać oczekiwaniom i czasem dochodzi do ich intensywnego, przedwczesnego zużycia i konieczne staje się przeprowadzenie kosztownego remontu. Jednym z niewyjaśnionych dotąd zjawisk jest proces nadmiernego zużycia łożyska, a zwłaszcza czopa wału współpracującego z gumową panwią. Za cel badawczy postawiono sobie zbadanie wpływu naprężeń zginających występujących w wale na stopień jego zużycia. Badania eksperymentalne przeprowadzono na specjalnie zaprojektowanym stanowisku badawczym. Wyniki pierwszej serii badań potwierdziły, że naprężenia zginające w wale mają wpływ na wielkość zużycia.
Źródło:
Tribologia; 2017, 271, 1; 81-86
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Projekt małego promu pasażerskiego z napędem hybrydowym – koncepcja napędu i wybrane problemy gospodarowania energią
Autorzy:
Kunicka, M.
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/304954.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Druk-Art
Tematy:
prom pasażerski
napęd hybrydowy
gospodarka energią
passenger ferry
hybrid drive
energy management
Opis:
Nowoczesne i ekologiczne układy napędowe zyskują coraz większą popularność. Ze względu na wzrost świadomości społeczeństwa oraz restrykcyjne przepisy odnośnie ochrony środowiska w najbliższych latach konwencjonalne układy napędowe mogą nie zostać dopuszczone do dalszej eksploatacji. Dobór alternatywnego rozwiązania jest zależny od wielu czynników, jak na przykład od rodzaju akwenu, po którym porusza się jednostka pływająca, jej przeznaczenia, autonomiczności czy stylu pływania. Dla małego promu pasażerskiego, poruszającego się w wąskim kanale wodnym, można wybrać jedno z nowoczesnych rozwiązań, jakim jest zastosowanie napędu hybrydowego szeregowego. Poprzez badania oporowe przeprowadzone na basenie modelowym, możliwe jest również dobranie korzystnej strategii pływania, pozwalającej na ograniczenie zużycia energii, a tym samym poniesionych kosztów.
Modern and eco-friendly propulsion systems are gaining more and more popularity. Due to the increase of public awareness and stringent environmental regulations, classic, conventional propulsion systems may not be allowed to use. Choosing another solution depends on many different factors, such as kind and size of water area, ship’s autonomy/destination or movement strategy. For a small inland ferry, it’s possible to choose one of the modern solutions, which is serial hybrid propulsion. Also through a research based on a ship’s resistance (hydromechanics), it is possible to select profitable movement strategy that causes decrease in costs.
Źródło:
Napędy i Sterowanie; 2017, 19, 10; 124-128
1507-7764
Pojawia się w:
Napędy i Sterowanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The catamarans George and Energa Solar
Autorzy:
Duda, D.
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/259605.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
leg-driven boats
solar- energy - driven boats
renewable energ
Opis:
Since a few years students of the Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology , have designed and built untypical floating units. Until last year their efforts were focused mainly on leg-driven boats. The boats of interesting design have taken part in yearly competitions : the International Waterbike Regatta. Their advanced design made it possible to compete with the best boats from Croatia, Holland, Germany, Turkey and Italy. Recently the students have designed and built a solarenergy-driven boat. It is the catamaran Energa Solar which took part in a prestigious regatta : the Frisian Nuon Solar Challenge carried out in Holland in summer 2006.
Źródło:
Polish Maritime Research; 2007, 3; 3-6
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Propozycja modernizacji układu napędowego pasażerskiego statku śródlądowego z konwencjonalnego na hybrydowy
Autorzy:
Litwin, W.
Leśniewski, W.
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/304544.pdf
Data publikacji:
2017
Wydawca:
Wydawnictwo Druk-Art
Tematy:
układ napędowy
zielona żegluga
napęd hybrydowy
drive system
Green Shipping
hybrid drive
Opis:
Na przestrzeni ostatnich lat zaobserwowano znaczny wzrost zainteresowania ekologicznymi układami napędowymi rekreacyjnych oraz użytkowych jednostek pływających, wpisującymi się w nurt przyjaznej środowisku, bez emisyjnej, zielonej żeglugi. Problemem jest jednak skonstruowanie bezpiecznej dla pasażerów jednostki pływającej, o możliwie niskim zapotrzebowaniu na energię, wyposażonym w wysoko sprawny, bez emisyjny układ napędowy. Jeszcze większym problemem jest modernizacja istniejącej jednostki tak aby spełniała oczekiwania armatora przy zazwyczaj ograniczonym budżecie. W artykule przedstawiono główne problemy na jakie natrafili autorzy koncepcji przebudowy układu napędu i zasilania zabytkowego śródlądowego statku pasażerskiego. Zgodnie z życzeniem właściciela jednostki napęd konwencjonalny zastąpiony miałby zostać układem hybrydowym szeregowym opartym o dwa silniki elektryczne i przekładnię sumującą. Na podstawie badań eksperymentalnych przeprowadzonych na rzeczywistym statku wyznaczono zapotrzebowanie na moc napędu w funkcji prędkości oraz obliczono pojemność akumulatorów.
The paper presents results of experiment-based tests of power demand, which were carried out on a 25 m long, historical passenger ship. Two version of the propulsion system, serial hybrid and parallel hybrid, were analyzed with regard to the longest route travelled by the ship in one day. The results of energy demand and environmental impact were compared with the installed conventional propulsion system. Due to the expected high level of safety which should be ensured on a passenger ship, the serial hybrid system was based on two electric motors powered by two separate sets of lithium batteries. Such solution allows for obtaining greater reliability, as well as a high level of energy-efficiency. The analysis results demonstrate that the serial propulsion system puts the least burden on the environment but at the same time, its investment cost remains the highest.
Źródło:
Napędy i Sterowanie; 2017, 19, 5; 64-69
1507-7764
Pojawia się w:
Napędy i Sterowanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Energy efficient and environmentally friendly hybrid conversion of inland passenger vessel
Autorzy:
Litwin, W.
Leśniewski, W.
Kowalski, J.
Powiązania:
https://bibliotekanauki.pl/articles/259006.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ship propulsion
hybrid propulsion
green shipping
zero emission
solar power
Opis:
The development and growing availability of modern technologies, along with more and more severe environment protection standards which frequently take a form of legal regulations, are the reason why attempts are made to find a quiet and economical propulsion system not only for newly built watercraft units, but also for modernised ones. Correct selection of the propulsion and supply system for a given vessel affects significantly not only the energy efficiency of the propulsions system but also the environment – as this selection is crucial for the noise and exhaust emission levels. The paper presents results of experimental examination of ship power demand performed on a historic passenger ship of 25 m in length. Two variants, referred to as serial and parallel hybrid propulsion systems, were examined with respect to the maximum length of the single-day route covered by the ship. The recorded power demands and environmental impact were compared with those characteristic for the already installed conventional propulsion system. Taking into account a high safety level expected to be ensured on a passenger ship, the serial hybrid system was based on two electric motors working in parallel and supplied from two separate sets of batteries. This solution ensures higher reliability, along with relatively high energy efficiency. The results of the performed examination have revealed that the serial propulsion system is the least harmful to the environment, but its investment cost is the highest. In this context, the optimum solution for the ship owner seems to be a parallel hybrid system of diesel-electric type.
Źródło:
Polish Maritime Research; 2017, 4; 77-84
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Multi-source-supplied parallel hybrid propulsion of the inland passenger ship STA.H. Research work on energy efficiency of a hybrid propulsion system operating in the electric motor drive mode
Autorzy:
Kowalski, J.
Leśniewski, W.
Litwin, W.
Powiązania:
https://bibliotekanauki.pl/articles/259623.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
hybrid ship propulsion
ship propulsion
Opis:
In the Faculty of Ocean Engineering and Ship Technology, Gdansk University of Technology, design has recently been developed of a small inland ship with hybrid propulsion and supply system. The ship will be propelled by a specially designed so called parallel hybrid propulsion system. The work was aimed at carrying out the energy efficiency analysis of a hybrid propulsion system operating in the electric motor drive mode and at performing the noise pollution measurements. The performed investigations have shown that a significant impact on the efficiency and on the acoustic emission has the type of belt transmission applied.
Źródło:
Polish Maritime Research; 2013, 3; 20-27
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Design methodology for small passenger ships on the example of the ferryboat Motława 2 driven by hybrid propulsion system
Autorzy:
Gełesz, P.
Karczewski, A.
Kozak, J.
Litwin, W.
Piątek, Ł.
Powiązania:
https://bibliotekanauki.pl/articles/259617.pdf
Data publikacji:
2017
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
small passenger ships
urban ship
design methodology
hybrid propulsion system
Opis:
Dynamic development in practically all fields of science and engineering has not passed over shipbuilding . In last years, engineers got to their use computer software which makes it possible to perform strength and hydrodynamic calculations as well as to visualize design projects in 3 D space [1-4]. At their disposal they have full spectrum of modern solutions associated with the use of advanced materials and technologies [5-7]. More and more attention is also paid to impact onto the natural environment [8,9]. Every new object must influence the environment as low as possible, beginning from building phase through its service life up to final utilization – such approach is called „green-shipping”. However , not only practical reasons are important . Clients , i.e. ship owners and passengers of ships paid more and more attention to image of floating units. During decision taking on that from whom a transport service has to be ordered , the most modern ships of an attractive image matching with place and time, are often taken into consideration. Such situation has become a basis for an idea of working out a concept of a new ferryboat for National Maritime Museum. As the ferry has to navigate in „the heart of the town”, then , apart from strictly marine and engineering aspects , an important factor of its designing is its expected image - a set of significant meanings and emotions written in architecture language. The new ferryboat , like its historical predecessors , will never leave urban water routes.
Źródło:
Polish Maritime Research; 2017, S 1; 67-73
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrical Properties of InGaP Doped with Si
Autorzy:
Litwin-Staszewska, E.
Trzeciakowski, W.
Piotrzkowski, R.
Gonzalez, L.
Powiązania:
https://bibliotekanauki.pl/articles/1991938.pdf
Data publikacji:
1998-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.20.Fr
72.80.Ey
71.55.Eq
Opis:
We measured Hall concentration n in InGaP:Si epitaxial layers grown by MBE as a function of pressure P up to 2 GPa and of temperature T from 77 to 300 K. We interpreted our results in terms of the broad distribution of impurity states resonant with the conduction band. From the low-temperature n(P) dependence we can directly obtain the total density of impurity states around the Fermi level ρ(E$\text{}_{F}$). The Fermi level can be shifted with respect to impurity states by applying pressure and by using samples with different n. In this way we obtain ρ(E) in a wide energy range. We discuss the possible reasons for the observed broad distribution of ρ(E).
Źródło:
Acta Physica Polonica A; 1998, 94, 3; 431-435
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Universal Behaviour of Magnetoconductance due to Weak Localization in Two-Dimensional Systems - Example of GaInAs Quantum Wells
Autorzy:
Zduniak, A.
Dyakonov, M. I.
Litwin-Staszewska, E.
Knap, W.
Powiązania:
https://bibliotekanauki.pl/articles/1943851.pdf
Data publikacji:
1995-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.61.Ey
73.20.Dx
Opis:
Weak localization corrections to conductivity of a two-dimensional electron gas are studied by measurements of the magnetic field dependence of the conductivity in GalnAs quantum wells. We observe that, when presented as a function of the normalized magnetic field (x = B/B$\text{}_{tr}$, where B is the magnetic field, B$\text{}_{tr}$ = ħ/4eτD, D is the diffusion constant and τ is momentum relaxation time), different samples show very similar high field behaviour. A theoretical description is developed that allows one to describe in a consistent way high and low field behaviour. The theory predicts universal (B$\text{}^{1}\text{}^{/}\text{}^{2}$) behaviour of the conductivity correction for all 2D systems in the high field limit (r > 1). Low field behaviour depends strongly on spin and phase relaxation mechanisms. Comparison of the theory with experiment confirms the universal behaviour in the high field limit and allows one to estimate the spin and phase relaxation times for different GaInAs quantum wells.
Źródło:
Acta Physica Polonica A; 1995, 88, 5; 1053-1057
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Okołojądrowe rozmieszczenie arylsulfatazy C (ASAC) w komórkach krwi i szpiku w niektórych zespołach proliferacyjnych
Okolojadernoe razmeshhenie arisulfatazy C (ASAC) v kletkakh krovi i kostnogo mozga pri nekotorykh proliferacionnykh sindromakh
Perinuclear localisation of arylsulphatase C (ASAC) in blood and bone marrow cells in some proliferative syndromes
Autorzy:
Ławkowicz, W.
Litwin, J.
Traczyk, Z.
Kołakowska-Polubiec, K.
Rokicka, R.
Powiązania:
https://bibliotekanauki.pl/articles/2189529.pdf
Data publikacji:
1973
Wydawca:
Polskie Towarzystwo Diagnostyki Laboratoryjnej
Źródło:
Diagnostyka Laboratoryjna; 1973, 09, 1-2; 125-132
0867-4043
Pojawia się w:
Diagnostyka Laboratoryjna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Near IR Refractive Index for GaInN Heavily Doped with Silicon
Autorzy:
Cywiński, G.
Kudrawiec, R.
Rzodkiewicz, W.
Kryśko, M.
Litwin-Staszewska, E.
Misiewicz, J.
Skierbiszewski, C.
Powiązania:
https://bibliotekanauki.pl/articles/1791356.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.uj
78.66.Fd
81.15.Hi
68.55.-a
78.20.-e
Opis:
The authors report on growth and results of infrared measurements of GaInN heavily doped with silicon. The lattice matched to GaN epitaxial layer of $Ga_{0.998}In_{0.002}N:Si$ has been grown in plasma assisted molecular beam epitaxy in the metal rich conditions. The room temperature Hall concentration and mobility of electrons are 2× $10^{20} cm^{-3}$ and 67 $cm^{2}$/(Vs), respectively. The refractive index has been determined by variable angle spectroscopic ellipsometry. The refractive index exhibited a significant reduction of its value (from 2.25 to 2 at 1.55 μm) at near IR range where are the main interests of potential applications for nitride based intersubband devices. Reported here values of refractive indices at 1.55 and 1.3 μm are appropriate for fabrication of cladding layers with the required contrast to GaN for intersubband devices. The observed drop of refractive index is attributed to the carrier-induced plasma edge effect, which has been directly observed in reflectance spectrum.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 936-938
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł

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