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Wyświetlanie 1-15 z 107
Tytuł:
New designs of centrifugal magnetic fluid seals for rotating shafts in marine technology
Autorzy:
Matuszewski, Leszek
Powiązania:
https://bibliotekanauki.pl/articles/260045.pdf
Data publikacji:
2019
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
magnetic fluids
ferrofluids
lubricants
magnetic seals
static seals
rotational seals
Opis:
The centrifugal magnetic fluid seals have important advantage over the conventional centrifugal seals. They maintain very good sealing capacity at static, medium and high speeds of shaft rotation, with the increased seal lifetime, and minimum torque and static friction. These seals are particularly useful in cases when the angular shaft velocity varies and sometimes decreases to nearly or exactly zero, such as in flywheel applications, ship propeller main shafts, etc. Unique properties of the magnetic fluid give rare opportunities for application in marine design, where perfect sealing together with reliable lubrication are required. The paper presents a typical design and operation principle of a centrifugal magnetic fluid shaft seal, along with new design solutions. Not only in ocean technology and underwater robotics. Some cases of application of centrifugal magnetic fluid seals in modern sealing technology are included.
Źródło:
Polish Maritime Research; 2019, 2; 33-46
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of a face seal’s operational parameters on test bench
Autorzy:
Gacek, J.
Norymberczyk, Ł.
Płonka, S.
Powiązania:
https://bibliotekanauki.pl/articles/114411.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
face seals
testing of the seals
Opis:
The paper presents a method for determination of static characteristics of a gas lubricated face seal on the basis of experiment performed on the test bench. It has been developed a mathematical model QN=f(tg, pg, n) depicting effect of temperature of the gas tg, pressure of the gas pg and rotational speed of the shaft n on flow rate value of the gas QN. This dependency was used to determine pressure of the gas required for a selected operational parameters of the machine. To asses correctness of functioning of the seal it has been performed measurements of a selected 3D roughness parameters of the sealing rings. Slight changes in values of the 3D surface roughness of stationary and rotating rings before and after 25 working hours allow for conclusion about nearly contactless character of operation of the seal.
Źródło:
Measurement Automation Monitoring; 2015, 61, 12; 555-560
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of blade piston compressor
Autorzy:
Kalina, P.
Wodyński, P.
Irzycki, A.
Snopkiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/245549.pdf
Data publikacji:
2011
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
mechanics
compressor
seals
Opis:
The paper presents the results of scientific research of the blade-type piston compressor which were conducted on the test rig built especially for this purpose. The construction concept of the compressor, design calculation of its main elements and tests of contact- and contactless sealing types were discussed in papers published at subsequent KONES-symposia 2009 and 2010. The results shown in present document are focused on studies of compressor having the piston equipped with labyrinth or contact seals. When testing on test bench, the intake air flow to the compressor as well as temperature and pressure of air compressed in the tank of 0.1 m3 were measured. Quick-changing pressure in the compression chamber and air temperature at the compressor's outlet were recorded and analyzed, also. The research was carried out for contact-type seals made of various materials which do not require lubrication and for contactless-type seals (labyrinth). In the course of studies the proper backlash between the piston and the cylinder wall was matched to ensure trouble-free operation of installation. The results of compressor power demand were presented in this article, too. This research work is performed under the framework program "Inicjatywa Technologiczna I" No 12218.
Źródło:
Journal of KONES; 2011, 18, 3; 143-148
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ring thruster – a preliminary optimisation study of ferrofluid seal and propeller
Autorzy:
Szydło, Z.
Matuszewski, L.
Powiązania:
https://bibliotekanauki.pl/articles/963466.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
ferrofluid seals
underwater propulsion
Opis:
The article reports the course of preliminary examination of a ferrofluid seal applied in liquid environment. A newly built research rig is described, and results of pressure tests performed for different shaft rotations are discussed. Other studies carried out in the past only referred to the gas environment, while the present examination aims at finding an answer to the question whether magnetic liquids can be successfully used in underwater applications. The obtained answer is positive, but further, more comprehensive investigations of the problem are necessary.
Źródło:
Polish Maritime Research; 2007, S 1; 71-74
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The “Seal of Rodogune” from Parthian Nisa
Autorzy:
Invernizzi, Antonio
Powiązania:
https://bibliotekanauki.pl/articles/52405175.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Parthian Nisa
Parthian seals
Opis:
The name of Rodogune was not applied only to the well known statuette of Aphrodite Anadyomene from Parthian Nisa, but also to a seal impressed on a sealing from the Nisa Square House. Although the attribution of the seal, unlike that of the statuette, was not discussed in detail, the portrait depicted on it was recognized as that of the Arsacid princess. Actually, the head is not female, but male, and can in all likelihood be that of Apollo with a laurel wreath. The style of execution suggests a relatively late date for the seal, not before the end of the 1st century BC –1st century AD, and allows its impression to be included in the general group of sealings from the Square House of Nisa.
Źródło:
Electrum; 2022, 29; 73-86
1897-3426
2084-3909
Pojawia się w:
Electrum
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An attempt to determine the digestibility of natural food in Antarctic seals using tracer method. A preliminary study
Autorzy:
Weiner, January
Woyciechowski, Michał
Zieliński, Jan
Powiązania:
https://bibliotekanauki.pl/articles/2058103.pdf
Data publikacji:
1981
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctic seals
digestibility
mineral elements
Źródło:
Polish Polar Research; 1981, 2, 1-2; 153-163
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Moulting southern elephant seals, Mirounga leonina (L.) and local weather conditions, on Livingston Island, South Shetland
Autorzy:
Cruwys, Elizabeth
Davis, Pamela B.
Powiązania:
https://bibliotekanauki.pl/articles/2052696.pdf
Data publikacji:
1994
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
moult
southern elephant seals
Źródło:
Polish Polar Research; 1994, 15, 3-4; 135-146
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into flows in turbine blade seals. Part III: Numerical calculations versus experiment
Autorzy:
Kosowski, K.
Stępień, R.
Piwowarski, M.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/1955750.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
turbine seals
CFD calculations
experimental investigations
Opis:
Experimental and theoretical investigations of the pressure field in the shroud clearance were performed on a one-stage air model turbine of the impulse type. Measurements of pressure distribution were carried out for various rotor speeds and turbine loads. 3D calculations of flows in this turbine were performed using the FLUENT CFD code. The calculations were carried out for variants which had been measured experimentally. The experimental data have been compared to theoretical results obtained with 3D codes for turbomachinery calculations. The Sliding Mesh and Multiple Reference methods have given very similar results of average values of pressure distribution and the velocity field in the shroud clearance. These results correspond to the experimental data. The pressure pulsations were determined only by the Sliding Mesh method, and these results have also been compared with the experiment. Stage flow calculations carried by the Sliding Mesh method with a structural shroud mesh and with a minimum number of 2-2.5 million cells have given a range of non-stationary pressure pulsations corresponding to the experimental data.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 329-336
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into flows in turbine blade seals. Part II: Numerical analysis
Autorzy:
Stępień, R.
Kosowski, K.
Badur, J.
Powiązania:
https://bibliotekanauki.pl/articles/1955751.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
turbine seals
CFD calculations
experimental investigations
Opis:
3D calculations of an axial model turbine of the impulse type were performed using the FLUENT CFD code. The calculations were carried out for variants which had been measured experimentally. Special attention was paid to the pressure field in the rotor blade shroud clearance. The Multiple Reference Frame method, the Mixing Plane method and the Sliding Mesh method were applied, and meshes of different types and configurations were used for calculations. Only the Sliding Mesh technique appeared to describe non-stationary effects and pressure pulsations in the turbine flow channels and clearances. In this part of the paper, numerical analysis is described, while the comparison between the experimental and the calculated results is presented in part III.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 319-327
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanizm zapewniania wiarygodności stron internetowych
A dependability assurance method for WEB applications
Autorzy:
Kaczmarek, J.
Wróbel, M.
Powiązania:
https://bibliotekanauki.pl/articles/266754.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Elektrotechniki i Automatyki
Tematy:
wiarygodność
bezpieczeństwo
pieczęcie
dependability
security
seals
Opis:
Zapewnianie wiarygodności danych w Internecie to ważne zagadnienie współczesnej informatyki. Dynamiczny rozwój globalnej sieci komputerowej pociąga za sobą zarówno ogromne korzyści, jak i poważne zagrożenia. Jednym z zagrożeń jest brak wiarygodności stron internetowych zarówno z punktu widzenia wiarygodności dostawcy, jak również możliwości nieautoryzowanej zmiany treści. W artykule przedstawiono niektóre mechanizmy zapewniania wiarygodności stron WWW takie jak podpis cyfrowy, kryptograficzne podpisywanie mikrotreści czy pieczęcie kontrolne. Opisano wykonany system realizujący mechanizm pieczęci weryfikującej niezmienność treści, oparty na wyliczaniu kryptograficznej sumy kontrolnej pliku. Podano zasadę działania systemu oraz wybrane aspekty projektowe takie jak diagramy UML oraz interfejs użytkownika. Rozważono również skuteczność i praktyczną przydatność takiego rozwiązania.
Dependability assurance of internet-based information is an important issue that concerns both information supplier and the information itself. The paper overviews selected mechanisms of web page dependability assurance including: digital signatures, cryptographic signatures of micro information and security seals. Additionally, the paper describes a developed system that supplies a control seal mechanism that verifies integrity using cryptographic sum of file contents. We present main elements of system operation and selected design components, including UML diagrams and user interface.
Źródło:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej; 2011, 30; 65-68
1425-5766
2353-1290
Pojawia się w:
Zeszyty Naukowe Wydziału Elektrotechniki i Automatyki Politechniki Gdańskiej
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calculations of labyrinth seals with and without diagnostic extraction in fluid-flow machines
Autorzy:
Kaszowski, P.
Dzida, M.
Krzyślak, P.
Powiązania:
https://bibliotekanauki.pl/articles/259462.pdf
Data publikacji:
2013
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
labyrinth seals
Fanno curve
diagnostic extraction
Opis:
Labyrinth seals are essential components of steam turbine unit constructions. Two types of labyrinth seals can be named, the first of which is the seal without diagnostic steam extraction, and the second – with extraction. The distribution of flow parameters along the packing is affected remarkably by the average seal clearance. The presence of diagnostic extraction leads to the equation system which is determinable and can be inversed to calculate the average seal clearance Si. Analysing the obtained results leads to the conclusion that the information about this parameter provides opportunities to monitor the current state of the packing in real time. The applied calculation procedure bases on the de Saint - Venant equation. The article also includes a brief description of both types of seals.
Źródło:
Polish Maritime Research; 2013, 4; 34-38
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Blade-type piston compressor investigation of seals
Autorzy:
Kalina, P.
Chomczyk, W.
Irzycki, A.
Snopkiewicz, K.
Powiązania:
https://bibliotekanauki.pl/articles/246203.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
piston machines
piston compressor
seals testing
Opis:
The paper presents the test results of selected seals applied in the blade-type piston compressor designed and realized in Propulsion Department of Institute of Aviation according to Patent No 6822 specification. Principle of operation of the compressor and the construction of test stand utilized to the seals testing were presented in the paper published in the Journal of KONES 2009. The special blade-type piston realizes a pendulous movement in the circular cylinder divided into two bulkheads. Each of bulkheads, fitted out with a set of bidirectional operating valves, creates by sequential opening and closing of them two compression chambers for one blade. Comprehensive tests of different kinds of seals were carried out on a single-compression machine driven by pneumatic actuator. The pressure rise vs. blade movement and drop of pressure when the piston was stayed at top dead centre were measured. The results of leak tightness of other structures of blade-type piston were analyzed as well and are subject to the following paper. The new design of piston relied on fitting-out of piston with side disc was prepared with intention of eliminating the loss of usable pressure in compression chamber, especially in area of top dead centre. The proposed design eliminated the leaks on the drive shaft and lateral seals, but not on the cylindrical surface of disco.
Źródło:
Journal of KONES; 2010, 17, 1; 199-204
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An electric ring thruster as auxiliary manoeuvring propulsion system for watercraft - construction analysis
Autorzy:
Matuszewski, L.
Falkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/963464.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
electric motor
steering
magnetism
ferrofluid seals
Opis:
The reported project aimed at examining properties and purposefulness of use of modern electromagnetic bearings for a screw propeller in a prototype version of a synchronous ring motor with rare earths magnets. Bearings of this type generate electromagnetic forces which keep the rotor in a state of levitation. The rotating machine with magnetic bearings can work in any environment which reveals diamagnetic properties (air, vacuum, water, liquid gases, etc.). However, a basic quality of the magnetic bearings is elimination of cooling installation and lubrication, which is necessary for proper operation of rotating machines with rolling and slide bearings, undergoing wear with time. Therefore the lifetime of the machine supported on magnetic bearings is incomparable with others. Also torque losses on this bearing are the smallest, compared to all known types of bearings. Ring thrusters can be used as the main drive for relatively small sea-going and inland vessels, and as manoeuvring drive for ships of arbitrary size, especially for AES (All Electric Ship) type vessels. This type of propeller is extremely useful for any types of abyssal vessels, autonomous and remotely controlled, and on submarines. It can also be used as effective generator of electric current for charging batteries in towing trains, barges for instance. The project consisted of three research tasks: 1. Designing, manufacturing and examination of a magnetic bearing on-line controlled by a digital controller, 2. Manufacturing a model of a ring thruster and examination of characteristics of a propeller mounted in the ring, 3. Examining the ferrofluid seal. A concept of the new thruster is a consequence of investigations carried out in Poland upon propellers and magnetic bearings in years 2001-2005.
Źródło:
Polish Maritime Research; 2007, S 1; 62-66
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research into flows in turbine blade seals. Part I: research methods
Autorzy:
Badur, J.
Kosowski, K.
Stępień, R.
Piwowarski, M.
Powiązania:
https://bibliotekanauki.pl/articles/1955758.pdf
Data publikacji:
2003
Wydawca:
Politechnika Gdańska
Tematy:
turbine seals
CFD calculations
experimental investigations
Opis:
Flows in the shroud clearance affect leakage losses and, thus, the turbine stage efficiency. However, at the same time, the distribution of pressure in the seal gaps plays an important role in the generation of the so-called "pressure forces", which may cause self-excited rotor vibrations of the aerodynamic type. Our investigations were carried out in order to show how a CFD code can cope with determining the pressure field in a rotor-blade shroud clearance. Experimental investigations of the pressure field in the shroud clearance were performed on a one-stage air model turbine of the impulse type. Measurements of pressure distribution were carried out for various rotor speeds and turbine loads. 3D calculations of flows in the model turbine were performed using the FLUENT CFD code. The calculations were carried out for the same variants which had been measured experimentally. In this part of the paper, the experimental stand and the numerical methods are described, while a detailed numerical analysis and a comparison between the experimental and the calculated results are presented in parts II and III, respectively.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2003, 7, 3; 309-317
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Archives of Artaxata: Archival Practice in the Capital of Ancient Armenia
Autorzy:
Schreiber, Torben
Powiązania:
https://bibliotekanauki.pl/articles/52401040.pdf
Data publikacji:
2021
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Hellenistic
Archives
Seals
Sealings
Armenia
Artaxata
Opis:
This article examines the seal impressions from Artaxata discovered in 1979/80 during excavations carried out by the Armenian Academy of Sciences on Hills V and VIII. As the archive on Hill VIII is quite small with only 20 to 25 seal impressions, the focus of this paper lies on the approximately 8,000 seal impressions found on hill V. The complex was dated to the period from 180 BC to 59 AD and it was assumed that it was a “private” archive or a kind of “chancellery.” An analysis of the finds in a wider context and the comparison with other archival complexes of the Hellenistic period as well as an examination of the characteristic features of “official” seals (size, image, shape, number of impressions) leads to the conclusion that it must have been a public archive, most probably it is the city archive of Artaxata.
Źródło:
Electrum; 2021, 28; 277-310
1897-3426
2084-3909
Pojawia się w:
Electrum
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 107

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