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Wyświetlanie 1-15 z 84
Tytuł:
New designs of magnetic fluid seals for reciprocating motion
Autorzy:
Matuszewski, Leszek
Bela, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/2033241.pdf
Data publikacji:
2021
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
magnetic fluid seal
reciprocating motion
critical pressure
sealing mechanism
failure reason of the seal
new seal designs
Opis:
The operating conditions of magnetic fluid seals during reciprocating motion are so different from those observed in rotating motion that the use of their conventional structures for reciprocating motion seals yields no good results. The analysis of the sealing mechanism of magnetic fluid seals in reciprocating motion shows that the operation of these seals is affected by the carry-over phenomenon and magnetic fluid film deformation in the sealing gap, which depends on the velocity of the reciprocating motion. The reduced amount of magnetic fluid in the sealing gap caused by the reciprocating motion of the shaft is the main reason for seal failures. The paper presents a short characterisation of magnetic fluid sealing technology, the principle of sealing, the operation of the magnetic fluid and the seal failure mechanism in linear motion of the shaft. Moreover, some new structural designs of hybrid seals, being combinations of typical hydraulic seals with magnetic fluid seals for reciprocating motion, and some examples of magnetic fluid sealing structures for hydraulic cylinders and piston compressors which havepractical application values are presented.
Źródło:
Polish Maritime Research; 2021, 4; 151-159
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Self-controlled face seal
Samoregulujące się uszczelnienie czołowe
Autorzy:
Kundera, C.
Marcinkowski, W. A
Powiązania:
https://bibliotekanauki.pl/articles/152528.pdf
Data publikacji:
2008
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
czołowe uszczelnienie impulsowe
sterowanie
impulse face seal
control
Opis:
The analysis concerns a double seal with a concentric arrangement of sealing degrees. The design of the seal is based on some known properties of self-controlled face impulse seals. The surface geometry of the ring faces was modified so that the height of the gap could be self-controlled. In order to maintain a desired face separation, it is necessary to control the opening force that acts on the flexibly mounted ring. When formulating the mathematical model of the impulse face seal we took into account the equation of balance of the flow rate in the face gap. Some characteristics are provided to illustrate the performance of the seal with an internal control system.
W pracy rozpatrywane jest podwójne uszczelnienie ze współśrodkowym rozmieszczeniem stopni. W konstrukcji tego uszczelnienia wykorzystano znane własności "samoregulujących się" czołowych uszczelnień impulsowych. Efekt samoregulacji wysokości szczeliny uzyskano poprzez zastosowanie odpowiednich modyfikacji geometrycznych na powierzchniach czołowych pierścieni. Pożądaną wysokości szczeliny otrzymano poprzez regulację "otwierającej" siły hydrodynamicznej w szczelinie działającej na pierścień podatnie zamocowany. Sformukowano model matematyczny uszczelnienia impulsowego z wykorzystaniem równania bilansu natężenia przepływów przez szczelinę czołową. Przedstawiono wybrane charakterystyki otrzymane dla uszczelnienia z wewnętrznym układem regulacji.
Źródło:
Pomiary Automatyka Kontrola; 2008, R. 54, nr 5, 5; 270-272
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
What-if analysis of the labyrinth seal of the gas turbine rotor tip
Autorzy:
Wróblewski, W.
Bochon, K.
Borzęcki, T.
Powiązania:
https://bibliotekanauki.pl/articles/175228.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas turbine
labyrinth seal
honeycomb
CFD
Opis:
This paper presents a preliminary, numerical what-if analysis of selected geometrical parameters of the tip seal of the last stage of an aircraft engine turbine and the impact of the parameters on the leakage mass ow. The analysis is a part of the task of improving the rotor tip seal conguration in aircraft turbines. Calculations were carried out using the commercial computational uid dynamics code. A straight-through seal with two leaning ns and a honeycomb land was analysed. The computational model was prepared based on some simplications introduced to improve the eciency of the calculations. The rotor entire blade-to-blade channel was analysed, while the seal pitch was reduced to the dimensions of two honeycomb cells. The geometry of the ns themselves was simplied too. In the original variant, the n tips had caps to protect them from wear (shape deformation) due to rubbing. In the simplied model, the caps were omitted. The simplications did not change the leakage mass ow signicantly. Several variants of changes in the basic geometrical parameters of the seal were analysed to assess their eect on the leakage mass ow for altered ow conditions. Parameters such as the n thickness, the n inclination angle and the position of the ns and of the entire labyrinth were analysed. The best seal variant was selected, the ow phenomena were commented on and some points in the design of this type of the labyrinth seal were discussed.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 136; 3-21
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How much a geometrical model of a honeycomb seal can be simplied in the CFD calculation
Autorzy:
Stajnke, M.
Włodarski, W.
Powiązania:
https://bibliotekanauki.pl/articles/175443.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CFD modeling
steam turbine
seal
honeycomb
Opis:
This paper presents the influence of geometry simplification on the results obtained in the computational fluid dynamics simulation. The subject of simulation was part of the honeycomb seal located at the inlet to high pressure part of a steam turbine. There were three diferent geometrical models assumed in the calculations. First one was two-dimensional case and two others were three-dimensional, one with the radius of curvature and one without. Numerical simulations were performed for 15 sets of boundary conditions to compare flow characteristics for each geometrical case.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 136; 55-64
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The application of fault seal analysis at the Solokha field, Dnieper-Donets Basin, Ukraine – case studies
Autorzy:
Okrepkyi, O.
Tiapkina, A.
Powiązania:
https://bibliotekanauki.pl/articles/184614.pdf
Data publikacji:
2015
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Dnieper-Donets Basin
Fault Seal Analysis (FSA)
hydrocarbon traps
Opis:
The Solokha gas field is one of the most valuable hydrocarbon fields in the central axial part of the Dnieper-Donets Basin (DDB). Every new exploration well there has to be highly validated in order to reduce possible drilling risks. In this study, the characteristics of faults, as possible seals, are analysed, based on the latest well and 3D seismic data. Evaluating fault seal risk is a constitutive factor in hydrocarbon exploration and production. For this reason, to reduce uncertainty in the faults’ leaking facilities, we used a couple of known approaches, such as juxtaposition analysis, with building Allan diagrams, to determine the relationship between sand-sand juxtaposition and the occurrence of hydrocarbons-bearing sands. We used the Shale Gouge Ratio (SGR) calculation with prediction of clay content distribution along the faults, pressure data analysis, seismic at tributes modelling and self-organized map clustering analysis for accurate delineation of sand bodies shape. This represents a complex research method of integration of high-quality depth processing with seismic structural and stratigraphic interpretation and, also, geological modeling. In this paper, we assessed the Jurassic and Visean faults of the Solokha gas field, according to their fluid cross-flow facilities. This research will provide valuable information about the presence of prospective places for hydrocarbon accumulation and will likely impact the well staking process for the upcoming drilling.
Źródło:
Geology, Geophysics and Environment; 2015, 41, 3; 275-283
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
CFD-predicted rotordynamic characteristics of a high temperature sodium liquid seal
Autorzy:
Wang, Tong
Chen, Pingwei
Ma, Wensheng
Yu, Guangbin
Powiązania:
https://bibliotekanauki.pl/articles/2086978.pdf
Data publikacji:
2022
Wydawca:
Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:
sodium liquid seal
multi-frequency whirling model
rotordynamic characteristics
CFD
Opis:
Rotordynamic characteristics of a high temperature sodium liquid (HTSL) seal were studied in this paper by using CFD software. Compared with the water liquid seal, the HTSL seal has a larger leakage flow rate and a lower drag power loss. The HTSL seal has a larger direct stiffness coefficient and the effective stiffness coefficient Keff is also larger than the water liquid seal, which means the HTSL seal has a better stiffness capacity. The HTSL seal possesses a positive effective damping coefficient Ceff in the whole whirling frequency range, which means better stability for the rotor system especially in high rotor speeds.
Źródło:
Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 347--360
1429-2955
Pojawia się w:
Journal of Theoretical and Applied Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of tip seal with honeycomb land in LP counter rotating gas turbine engine
Autorzy:
Wróblewski, W.
Dykas, S.
Bochon, K.
Rulik, S.
Powiązania:
https://bibliotekanauki.pl/articles/1943216.pdf
Data publikacji:
2010
Wydawca:
Politechnika Gdańska
Tematy:
tip seal
LP turbine
honeycomb land
optimization
Opis:
The goal of the presented work is an optimization of the geometrical configuration of the tip seal with a honeycomb land, to reduce the leakage flow in the counter-rotating LP turbine of a contra-rotating open rotor aero-engine. This goal was achieved with the use of the Ansys-CFX commercial code and an in-house optimization procedure. The detailed studies including the mesh influence, the stages of the computational domain simplification, and geometry variants are discussed. The optimization process is based on a single objective genetic algorithm (SOGA). The automatic grid generation process and the CFD calculations are based on scripts prepared under the Ansys-ICEM and Ansys-CFX software. The whole procedure is written in the Visual Basic for Applications language (VBA), which allows a direct access to the CAD software with the use of macros and allows a proper connection between the CAD environment and the CFD software. The described algorithm allows parallel computing. In addition to the optimization studies, a sensitivity analysis was also performed. For this purpose, the Elementary Effects Method (EEM) was used. This paper was written within the DREAM European project (Validation of Radical Engine Architecture Systems) of the 7th Framework Program of the European Union.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2010, 14, 3; 189-207
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research of air movement in the labyrinth seal of rollers of conveyor belt
Autorzy:
Kononov, G.
Artemov, S.
Dubrovskyi, S.
Kravtsova, D.
Powiązania:
https://bibliotekanauki.pl/articles/139846.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
roller housing
bearings
labyrinth seal
belt conveyor
modeling
Opis:
In the paper, the authors present the solution aimed at increasing reliability of the conveyor units. The analysis of technological and operational defects of conveyor rollers is presented. The changes in manufacturing technology have been proposed, which allowed for avoiding welding and provided the required level of tightness. Computer simulation of the motion of air in the labyrinth seal of the roller was conducted to determine the numerical parameters of possible airflows. It is proved that the airflow is present in the gap of the labyrinth seal due to the roller rotation. It is shown that the reason for the penetration of abrasive particles through the labyrinth seal after stopping is decompression, which occurred as a result of temperature change and push out of airflows during rotation. It is also suggested that the number of stops during the operation should be taken into account when determining the durability of rollers. Practical recommendations are given for preventing the penetration of abrasive particles during conveyor stops and the need for combined seals. The results can be used for the construction of roller conveyor belts in any industry.
Źródło:
Archive of Mechanical Engineering; 2019, LXVI, 4; 439-445
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Life tests of a rotary single-stage magnetic-fluid seal for shipbuilding applications
Autorzy:
Matuszewski, L.
Szydło, Z.
Powiązania:
https://bibliotekanauki.pl/articles/258558.pdf
Data publikacji:
2011
Wydawca:
Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Tematy:
shaft sealing
magnetic fluid
utility water
seal durability
critical pressure
critical motion velocity
Opis:
Use of the magnetic fluid seal technology in water is much more difficult technological problem in comparison to gas or vacuum environment. Some seals constructed up to time been are designed as hybrid, two stage sealing structures with shields or mechanical seals used as protection measures to the magnetic fluid seal. Anyway, there is always problem with immediate contact between magnetic fluid and the environmental liquid. In the paper are presented results of experiments carried out with one stage rotating magnetic fluid seal operating in immediate contact with utility water. The special test procedures have been elaborated and practically used, with the aim to define main characteristics of magnetic fluid seals and to simplify experiments. These characteristics were: critical pressure, critical motion velocity and working life of the seal. Four grades of commercial, silicon based magnetic fluids of hydrophobic properties were tested in a single stage sealing system. The results of tests are presented in the form of tables and diagrams. It is concluded that hydrophobic commercial magnetic fluids could be efficiently used in rotating shaft seals however in a limited range of motion velocity.
Źródło:
Polish Maritime Research; 2011, 2; 51-59
1233-2585
Pojawia się w:
Polish Maritime Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of selected parameters on magnetic fluid seal tightness and motion resistance
Wpływ wybranych parametrów konstrukcyjnych na szczelność i opory ruchu uszczelnień z cieczą magnetyczną
Autorzy:
Szczęch, M.
Horak, W.
Salwiński, J.
Powiązania:
https://bibliotekanauki.pl/articles/190777.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
magnetic fluid seal
ferrofluid
motion resistance
seal tightness
critical pressure
uszczelnienia z cieczą magnetyczną
ferrociecz
moment oporu
szczelność uszczelnienia
Opis:
Magnetic fluid seals belong to the class of non-contact seals. They are used as protective seals for vacuum systems, high speed shafts, precision mechanics, and electromechanical devices. The proper functioning of the magnetic fluid seal is related to creating and maintaining the continuity of the fluid ring on the sealing stage. This is achieved by appropriately shaped magnetic field distribution in the region of the sealing stage. Consequently, one of the main issues with the construction of such seals is to determine the distribution of the magnetic field in this region. This paper presents the results of analytical calculations and numerical simulations, based on which the influence of selected geometric parameters on the critical pressure and motion resistance was determined.
Uszczelnienia z cieczą magnetyczną należą do klasy uszczelnień bezstykowych znajdują zastosowanie m.in., jako uszczelnienia ochronne w układach pracujących w próżni, w uszczelnieniach wałów szybkoobrotowych, urządzeń mechaniki precyzyjnej oraz przemyśle elektromechanicznym. Zachowanie poprawnego funkcjonowania uszczelnienia z cieczą magnetyczną związane jest z koniecznością wytworzenia i utrzymania ciągłości płynnego pierścienia ferrocieczy. Realizowane jest to za pomocą odpowiednio ukształtowanego rozkładu pola magnetycznego w szczelinie roboczej uszczelnienia. W związku z tym jednym z głównych zagadnień związanych z konstrukcją tego rodzaju uszczelnień jest określenie rozkładu pola magnetycznego w rejonie występu uszczelniającego. W pracy przedstawiono wyniki obliczeń analitycznych oraz symulacji numerycznych, na podstawie których określono wpływ wybranych parametrów konstrukcyjnych na kluczowe wielkości funkcjonalne uszczelnienia, tj. dopuszczalne ciśnienie oraz opory ruchu.
Źródło:
Tribologia; 2017, 274, 4; 71-76
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Remarks on the Iconographic Motif of the Birdman in Mesopotamian Glyptic Art of the Third Millennium BC
Autorzy:
Majchrzak, Dominika
Powiązania:
https://bibliotekanauki.pl/articles/484153.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Instytut Kultur Śródziemnomorskich i Orientalnych PAN
Tematy:
birdman
glyptic
seal
seal impression
Akkadian period
Early Dynastic period
Enki
Shamash
Opis:
The iconographic motif of the birdman emerged in Mesopotamian glyptic art in the Early Dynastic period and disappeared at the end of the Akkadian period. Its meaning remains ambiguous, particularly due to the fact that the figure is represented in scenes of varying character and it cannot be identified with any character known from myths. Sometimes, the creature may be recognised as a deity based on a horned crown, yet this is not always the case. Among the deities attested in the scenes with birdman, one can easily identify Shamash and Enki. The examined material contains 62 published seals or seal impressions with the birdman motif, both from the Early Dynastic and the Akkadian period. The latest monographic studies of this subject were published in the 1950s. Interpretations presented by the authors of said works, though often quoted in the research on the motif, seem to lack proper argumentation and, to an large extent, are outdated due to a considerable progress of the research on Sumero-Akkadian iconography and an increase, although modest, in study material, among other things. In light of the above, it is worth analysing this motif one more time.
Źródło:
Études et Travaux (Institut des Cultures Méditerranéennes et Orientales de l’Académie Polonaise des Sciences); 2018, 31; 219-234
2084-6762
2449-9579
Pojawia się w:
Études et Travaux (Institut des Cultures Méditerranéennes et Orientales de l’Académie Polonaise des Sciences)
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Seasonal and annual changes in Antarctic fur seal (Arctocephalus gazella) diet in the area of Admiralty Bay, King George Island, South Shetland Islands
Autorzy:
Ciaputa, Piotr
Siciński, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/2051914.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
Admiralty Bay
Antarctic fur seal
diet
Źródło:
Polish Polar Research; 2006, 27, 2; 171-184
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The oil film parameters of the wankel engine apex seal in aspects of durability of mating elements
Autorzy:
Iskra, A.
Babiak, M.
Kałużny, J.
Marszałkowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/247572.pdf
Data publikacji:
2010
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engines
Wankel engine
apex seal
oil film parameters
Opis:
The Wankel engine is one of only few alternatives to the reciprocating engines. The advantages such as good value of maximum engine power to its mass ratio are still present and can have great sense in selected fields of application, for example General Aviation. Nevertheless the disadvantages of the Wankel engine design have never lost its importance and still pose an obstacle to wider use of the Wankel engine. One of the main drawbacks is the rotor sealing system design, especially the apex seal where single siat has to fulfil a purpose of conventional engine piston rings pack. Moreover the unfavourable changes of the apex seal angle of attack causes that optimal shape of the apex seal sliding surface, in aspects of the oil film parameters, can not be achieved. These results in worsening of apex seal elements mating conditions, reducing its effectiveness and durability. In the paper authors present results of simulation researches where oil film parameters, for example oil film thickness, which determines apex seal durability, were obtained for different engine operating conditions and various shapes of apex seal sliding surface geometry. The results indicate possible directions during apex seal designing process which should provide oil film continuity in whole rotor angle position range and for wide engine operation conditions range.
Źródło:
Journal of KONES; 2010, 17, 4; 199-206
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The grooved lip effect on reciprocating hydraulic rod seal performances in transient condition: elastohydrodynamic lubrication
Autorzy:
Bahi, Y.
El Gadari, M.
Rahmoune, M.
Powiązania:
https://bibliotekanauki.pl/articles/264834.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
chropowatość
siła tarcia
wyciek
hydraulic rod seal
surface textured
roughness
friction force
leakage
Opis:
It is commonly known that the sealing performance of dynamic seals is significantly influenced by the surface finish. To reduce friction effect and leakage ratio, new generations of grooved lip or shaft have emerged, but only two computational models were performed up to now with a textured elastomeric lip: spiral groove in the axial direction or micro-cavities according to the circumferential direction. However, if the numerical results have confirmed the slight effect of the grooved lip on the rotary lip seal performances, it seems relevant to investigate the influence of such grooves on the reciprocating hydraulic rod seal behavior. Thus, the scope of this work is to perform a parametric study of the grooved lip throughout a one-dimensional elastohydrodynamic model by taking into account the elasticity of the lip and the shaft roughness. After confirming the validity of the current model, numerical simulations have been performed and compared with experiments. The effect of lip grooves on the hydraulic rod seal behavior in outstroke and instroke shaft motion has been underlined. Thereby, it is shown that the leakage and the average film thickness are sensible to both the depth and the density of the lip groove. Additionally, a slight effect of the pattern shape is observed on the friction force.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 11-21
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Protection of the seal of confession in the law of civil procedure and criminal proceedings
Autorzy:
Flaga-Gieruszyńska, Kinga
Tarnowska-Sobecka, Magda
Powiązania:
https://bibliotekanauki.pl/articles/1596024.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Tematy:
protection of the seal of confession
clergy
law of civil procedure
law of criminal proceedings
Opis:
This paper focuses on the issue of the different constructions of the law of civil procedure and criminal proceedings in reference to protection of the seal of confession. The analysis includes a review of the basic constitutional condition of the guarantee of the freedom of conscience and religion, as well as the detailed problems concerning the procedural status of clergy of various churches and religious associations within which there is individual confession. Furthermore, the authors also discuss the significant issue of the procedural status of other persons who have consciously or accidentally obtained information relayed to a member of the clergy during confession and the need to regulate their rights and obligations as witnesses in civil and criminal cases.
Źródło:
Acta Iuris Stetinensis; 2019, 28, 4; 63-88
2083-4373
2545-3181
Pojawia się w:
Acta Iuris Stetinensis
Dostawca treści:
Biblioteka Nauki
Artykuł
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