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Academic literature on the topic 'Seals (Cylinders)'

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Published: 25 July 2024

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Journal articles on the topic "Seals (Cylinders)"

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Mrzljak, Vedran, Jan Kudláček, Đerzija Begić-Hajdarević, and Jelena Musulin. "The Leakage of Steam Mass Flow Rate through the Gland Seals – Influence on Turbine Produced Power." Journal of Maritime & Transportation Science 58, no. 1 (June 2020): 39–56. http://dx.doi.org/10.18048/2020.58.03.

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In this paper is presented an analysis of gland seals operation and their influence on the performance of low power steam turbine with two cylinders and steam reheating, which can be used in marine applications. Performed analysis presents a comparison of steam turbine main operating parameters when gland seals operation is neglected (as usual in the most of the literature) and when steam mass flow rates leaked through all gland seals are taken into consideration. Steam mass flow rate leakage through all gland seals reduces produced power of the whole turbine and both of its cylinders. Operation of gland seal mounted at the inlet in the first cylinder of any steam turbine (cylinder which operates with the steam of the highest pressure) has the most notable influence on the reduction of the whole turbine produced power. Gland seal mounted at the outlet of the last turbine cylinder (cylinder which operates with the steam of the lowest pressure) did not have any influence on the reduction of steam turbine produced power. In any detail analysis of a steam turbine (especially the complex turbine with multiple cylinders), gland seals operation should be considered due to their notable influence on the turbine performance.
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Maxwell-Hyslop, K. R. "A Note on the Anatolian Connections of the Tôd Treasure." Anatolian Studies 45 (December 1995): 243–50. http://dx.doi.org/10.2307/3642923.

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Since the detailed study by Edith Porada of the cylinder seals and small objects from the celebrated treasure found in the temple of Mont at Tôd in Upper Egypt, questions concerning its origin and date still remain unanswered. Porada suggested that in addition to seals from Eastern Iran and possibly Afghanistan, a North Syrian origin for two of the cylinders seems a distinct possibility. Two other cylinder seals were carved in Mesopotamian style, one of them being datable to the period of the Third Dynasty of Ur. She also showed conclusively that there are no cylinders which can be dated later than 1800 B.C. (Middle Chronology) and that the latest cylinders belonged to the Isin-Larsa period. Her conclusions concerning the origin of the treasure and the importance of parallels for the amulets and other small objects with material from Mari and Ebla are entirely convincing. A recent study by Christine Lilyquist stresses the evidence for a date within the reign of Amenemhet II for the deposition of the treasure which was found in four metal boxes inscribed with the king's name. While in studies concerning the 153 silver vessels Cretan and Mycenaean prototypes have been cited, Anatolia has not received so much attention. Here it will be suggested that there is considerable recently published evidence from Anatolia and Syria which is relevant to the Tôd silver cups, and that a consideration of recently published textual material from Mari, Ebla, Rimah and Brak may also be useful.
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Mazza, Luigi, and Edoardo Goti. "Failure and Damage of Reciprocating Lip Seals for Pneumatic Cylinders in Dry Conditions." Lubricants 12, no. 4 (April 4, 2024): 119. http://dx.doi.org/10.3390/lubricants12040119.

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Lip seals are components subjected to high mechanical stress and they are responsible for many out-of-service in pneumatic cylinders. The aim of this work is the development of an experimental methodology to evaluate lifetime duration and analyse failures and damages of rod lip seals for pneumatic cylinders. A dedicated test bench was designed and manufactured which reproduces actual working conditions of the seals i.e., compressed air action (seal pressurisation) and relative linear reciprocating motion. Three types of seals made of two elastomers (NBR and polyurethane) were tested; dry condition was considered to speed up the tests. The influence of geometric parameters like seal seat dimension and seal axis misalignment with respect to the rod axis, was analysed by multiple experimental tests. Results in terms of seal life duration and failure modes are presented which allow comparison of seals performance and provide a helpful tool to end-users in a proper selection of seals geometry, material and key working parameters.
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Korzekwa, Joanna, Marek Bara, and Sławomir Kaptacz. "Al2O3/WS2 Surface Layers Produced on the Basis of Aluminum Alloys for Applications in Oil-Free Kinematic Systems." Materials 14, no. 24 (December 15, 2021): 7738. http://dx.doi.org/10.3390/ma14247738.

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The article presents the results of an aluminum oxide layer doped with monolayer 2H tungsten disulphide (Al2O3/WS2) for applications in oil-free kinematic systems. The results concern the test carried out on the pneumatic actuator operational test stand, which is the actual pneumatic system with electromagnetic control. The cylinders of actuators are made of Ø 40 mm aluminum tube of EN-AW-6063 aluminum alloy which is used in the manufacture of commercial air cylinder actuators. The inner surfaces of the cylinder surfaces were covered with an Al2O3/WS2 oxide layer obtained by anodic oxidation in a three-component electrolyte and in the same electrolyte with the addition of tungsten disulfide 2H-WS2. The layers of Al2O3 and Al2O3/WS2 obtained on the inner surface of the pneumatic actuators were combined with a piston ring made of polytetrafluoroethylene with carbon (T5W) material and piston seals made of polyurethane (PU). The cooperation occurred in the conditions of technically dry friction. After the test was carried out, the scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS) analysis of the surface of the cylinder bearing surfaces and piston seals of the pneumatic cylinders was performed. The analysis revealed the formation of a sliding film on the cylinder surface modified with tungsten disulfide, as well as on the surface of wiper seals. Based on the SEM/EDSM tests, it was also found that the modification of the Al2O3 layer with tungsten disulfide contributed to the formation of a sliding film with the presence of WS2 lubricant, which translated into smooth cylinder operation during 180 h of actuator operation. The cylinder with the unmodified layer showed irregular operation after approximately 70 h thereof.
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Shanbhag, Vignesh Vishnudas, Thomas Meyer, Leo Caspers, and Rune Schlanbusch. "Acoustic emission based condition monitoring study of piston rod seals by varying speed and pressure parameters." Annual Conference of the PHM Society 12, no. 1 (November 3, 2020): 9. http://dx.doi.org/10.36001/phmconf.2020.v12i1.1133.

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Hydraulic cylinders are used in a wide range of applications such as oil drilling equipment, construction vehicles and manufacturing machines. Seal failure is one of the primitive causes of failure in hydraulic cylinders, possibly leading to fluid spill, unscheduled maintenance, reduced availability and thus leading to lower productivity. Regular visual inspection of seals without affecting the productivity is difficult as the seals are placed internally in the hydraulic cylinder requiring disassembly of the piston. Therefore, condition monitoring is required to assess the current health of the seals. There have been successful attempts made in literature for the assessment of seal quality using acoustic emission-based condition monitoring. However, there have been very few studies performed to diagnose the seal failure under varying speed and pressure parameters. Therefore, this study aims at increasing the understanding of seal failure under varying speed and pressure conditions through correlation with the acoustic emission signal. Experiments were performed on a hydraulic test rig using unworn, semi-worn and worn piston rod seals. For each seal wear condition, experiments were performed for five strokes at pressure conditions of 10, 20, 30 and 40 bar and speeds of 50 mm/s and 100 mm/s. Continuous acoustic emission data were acquired during all the tests. The acoustic emission signal of each piston rod stroke was analyzed using different acoustic emission features such as power spectral density, root mean square, peak, mean frequency, median frequency and band power. From the acoustic emission analysis, by using power spectral density, mean frequency and median frequency feature it is possible to identify and segregate unworn seal, leakage due to semi-worn seal and leakage due to worn seal in the test rig. The acoustic emission-based condition monitoring methodology developed in this study lays a strong foundation for further research to develop real-time monitoring of the piston rod seal in hydraulic cylinders that are used in the offshore industry.
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Shanbhag, Vignesh Vishnudas, Thomas Meyer, Leo Caspers, and Rune Schlanbusch. "Diagnostics of seal and rod degradation in hydraulic cylinders using acoustic emissions." PHM Society European Conference 5, no. 1 (July 22, 2020): 8. http://dx.doi.org/10.36001/phme.2020.v5i1.1173.

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External leakage from hydraulic cylinders is of a major concern for the offshore oil and gas industry. This occurs mainly as a result of physical damage to the piston rod or due to degradation of the piston rod seals. Numerous studies have been conducted to diagnose leakage from hydraulic cylinders due to seal failure using fluid, pressure, accelerometer or acoustic emission-based condition monitoring techniques. However, very few attempts have been made to diagnose multiple faults in hydraulic cylinders at the same time. Therefore, in this study, acoustic emission-based condition monitoring technique is used to detect and separate acoustic emission features due to different faults that are observed in hydraulic cylinders. An experimental study was performed on a test rig using water glycol as hydraulic fluid. Experiments were performed with different combinations of seals (unworn, semi worn and worn seals), and piston rods (unworn and worn). Acoustic emission features such as root mean square, peak, mean, kurtosis, skewness, mean frequency, median frequency and bandpower were used to identify seal and rod conditions. By using acoustic emission median frequency and mean frequency features it was possible to detect and separate leakage, and seal and rod degradation in the test rig over a large range of hydraulic working pressures. This study indicates that acoustic emission monitoring can be a strong basis for future research to identify and segregate other types of faults that are observed in hydraulic cylinders.
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Firnandius, Jefvin, Agus Halim, and Agustinus Purna Irawan. "PERANCANGAN SISTEM HIDROLIK PADA PINTU WINGBOX BERKAPASITAS 2 TON." POROS 18, no. 2 (October 24, 2023): 96–103. http://dx.doi.org/10.24912/poros.v18i2.18755.

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Currently, many innovations are being made in developing a technology to facilitate human work. One of these technologies is the hydraulic cylinder. Hydraulic cylinders were created to facilitate human work, especially in the industrial sector. Hydraulic cylinder, using a liquid or so-called liquid fluid, to be able to make the hydraulic cylinder work. In the hydraulic cylinder components, there are cylinder axles, pistons and cover seals. In general, hydraulic cylinders can be used for wingboxes. A wingbox is a box on a truck, which can be opened from the side with the help of a hydraulic cylinder. This journal was created to study how the simulation of hydraulic cylinder components when working. The design method used is the reverse engineering method, where the components that have been designed are then simulation is made to find out how strong the component is in holding the load when the component is working. The simulation is carried out using the Autodesk Fusion 360 application to find out how strong the hydraulic cylinder works in bearing the load. The results of this method are obtained when the simulation results of the hydraulic cylinder have been obtained.
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Ali-Hikmat Ahmadov, Ali-Hikmat Ahmadov, and Ruslan Starchevoy Ruslan Starchevoy. "THE RELIABILITY OF A TWO-WAY HYDRAULIC CYLINDER." ETM - Equipment, Technologies, Materials 14, no. 02 (April 18, 2023): 05–09. http://dx.doi.org/10.36962/etm14022023-05.

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A hydraulic cylinder is a volumetric hydraulic motor that converts the energy of the fluid flow into various types of movement of the output link. The use of volumetric hydraulic drives with a hydraulic cylinder working element in all possible fields of industry does not require high capacities. One of the advantages is the ease of operation and overload protection. There are also disadvantages. For example, the hydraulic cylinder depends on the working fluid and in case of contamination it may fail, and therefore the reliability of the hydraulic cylinder decreases. In order to protect hydraulic cylinders from moisture and dirt entering them, as well as to increase their reliability, seals with dirt-removing rings are provided. When assembling or disassembling hydraulic cylinders, important conditions must be taken into account, since failure to comply with these conditions can lead to a defect. Considerable efforts have been made to the parts, so some manual operations are excluded when assembling and disassembling hydraulic cylinders. The reliability of the hydraulic cylinder and, consequently, its reliability are the main topic of the study. Hydraulic cylinders can be of translational action and rotary action. Translational ones include: piston, plunger, telescopic. Reciprocating, in turn, can be one-sided and two-sided. If it is required to create an effort in only one direction, a one-way hydraulic cylinder is designed. At the beginning of the work, a diagram of a volumetric hydraulic drive and its principle of operation is presented. Special attention is paid to assessing the reliability of the hydraulic cylinder. In conclusion, the results of the analyses and the conclusions of the calculations are given. The change in the reliability of the hydraulic cylinder over time was also indicated and the reasons for this change were named. Keywords: Reliability, hydraulic cylinder, hydraulic drive, failure, reliability assessment, pipeline, pump, valve, operating time, hydraulic distributor.
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Borisov, V. I., V. V. Kuznetsov, V. N. Vodyakov, and A. V. Kotin. "Experimental assessment of wear and plastic deformations of the hydraulic cylinder elastomeric seals." Traktory i sel hozmashiny 79, no. 10 (October 15, 2012): 23–25. http://dx.doi.org/10.17816/0321-4443-65986.

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Lothigius, Fredrik, and Jutta Etzkorn. "Intelligent Testing Tools." Industrial Vehicle Technology International 27, no. 1 (March 2019): 134. http://dx.doi.org/10.12968/s1471-115x(23)70446-7.

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Dissertations / Theses on the topic "Seals (Cylinders)"

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Reyes, A. T. "The stamp-seals of ancient Cyprus /." Oxford : Oxford University School of Archaeology, 2001. http://catalogue.bnf.fr/ark:/12148/cb392631246.

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Teissier, Beatrice. "Egyptian iconography on Syro-Palestinian cylinder seals of the middle bronze age /." Fribourg (Suisse) : Göttingen : University press ; Vandenhoeck & Ruprecht, 1996. http://catalogue.bnf.fr/ark:/12148/cb358189649.

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Kassfeldt, Elisabet. "Analysis and design of hydraulic cylinder seals." Doctoral thesis, Luleå tekniska universitet, Maskinelement, 1987. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17192.

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Hydraulic cylinder seal performance is studied experimentally and theoretically. The seal performance is discussed in terms of friction force and oil leakage, which are due to the oil film build-up in the seal contact. The theoretical analysis is based both on calculated and measured contact pressure distributions. The compressibility of seal materials is determined experimentally, and it is shown that the compressibility is a pressure dependent material property. A method for calculation of the contact pressure distribution for a seal with an arbitrary cross-section is proposed, based on geometrical considerations and the experimentally determined compressibility. The pressure calculations are verified experimentally. Theoretically calculated oil film thicknesses in a seal contact are compared with measured film thicknesses. The increase of film thickness with increasing sliding velocity shows a good agreement between theory and experiment. The oil film is thicker in the experiments due to the surface roughness of the seal. A complete theoretical analysis of the seal performance is developed to be used as a design tool.
Godkänd; 1987; 20070424 (ysko)
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Roach, Karen Jane. "The Elamite Cylinder Seal Corpus, c.3500 - 1000 BC." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/5352.

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The ancient region of Elam (southwestern Iran) has produced a significant assemblage of cylinder seals across a considerable chronological span. Unlike the glyptic material from the related and neighbouring region Mesopotamia, the Elamite cylinder seals have not previously been studied in detailed reference to one another, nor has there been an established paradigm of stylistic development articulated. This study addresses this lacuna by compiling all the published cylinder seals from Elam (as defined here, thus incorporating the historical provinces of Khuzistan, Luristan and Fars), from their earliest appearance (c.3500 BC), throughout the era of their typological dominance (over stamp seals, thus this study departs c.1000 BC). This compilation is presented in the Elamite Cylinder Seal Catalogue (Volume II), and is annotated and described through the annunciation of eighteen chronologically defined developmental styles (with another two non-chronological type classifications and four miscellaneous groups). Through the further analysis of this data, including the newly formulated and articulated styles, several facets and problems of Elamite glyptic material have been addressed (and thus the reliance upon assumed similarity in type and function with the Mesopotamian glyptic material is abandoned). These problems particularly pertain to the function of cylinder seals in Elam and the type and form of the Elamite-Mesopotamian glyptic interaction. In regards to function, a standard administrative function can be discerned, though of varying types and forms across the region and the period of study. Other, non-standard, symbolic glyptic functions can also be demonstrated in the Corpus, including the apparent proliferation of a form known as the ‘votive’ seal, perhaps a specifically Elamite form. The analysis of the style type (whether ‘Elamite’, ‘Mesopotamian Related’ or ‘Shared Elamite-Mesopotamian’), in association with their relative geographical and chronological distribution, has also enabled the discussion of the nature of Elamite-Mesopotamian glyptic interaction, and thereby the constitution of Elamite civilisation (especially in regards to Mesopotamian cultural impact and influence, and thus the testing of several previously presented paradigms [Amiet 1979a; 1979b; Miroschedji 2003]).
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Roach, Karen Jane. "The Elamite Cylinder Seal Corpus, c.3500 - 1000 BC." University of Sydney, 2008. http://hdl.handle.net/2123/5352.

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Doctor of Philosophy
The ancient region of Elam (southwestern Iran) has produced a significant assemblage of cylinder seals across a considerable chronological span. Unlike the glyptic material from the related and neighbouring region Mesopotamia, the Elamite cylinder seals have not previously been studied in detailed reference to one another, nor has there been an established paradigm of stylistic development articulated. This study addresses this lacuna by compiling all the published cylinder seals from Elam (as defined here, thus incorporating the historical provinces of Khuzistan, Luristan and Fars), from their earliest appearance (c.3500 BC), throughout the era of their typological dominance (over stamp seals, thus this study departs c.1000 BC). This compilation is presented in the Elamite Cylinder Seal Catalogue (Volume II), and is annotated and described through the annunciation of eighteen chronologically defined developmental styles (with another two non-chronological type classifications and four miscellaneous groups). Through the further analysis of this data, including the newly formulated and articulated styles, several facets and problems of Elamite glyptic material have been addressed (and thus the reliance upon assumed similarity in type and function with the Mesopotamian glyptic material is abandoned). These problems particularly pertain to the function of cylinder seals in Elam and the type and form of the Elamite-Mesopotamian glyptic interaction. In regards to function, a standard administrative function can be discerned, though of varying types and forms across the region and the period of study. Other, non-standard, symbolic glyptic functions can also be demonstrated in the Corpus, including the apparent proliferation of a form known as the ‘votive’ seal, perhaps a specifically Elamite form. The analysis of the style type (whether ‘Elamite’, ‘Mesopotamian Related’ or ‘Shared Elamite-Mesopotamian’), in association with their relative geographical and chronological distribution, has also enabled the discussion of the nature of Elamite-Mesopotamian glyptic interaction, and thereby the constitution of Elamite civilisation (especially in regards to Mesopotamian cultural impact and influence, and thus the testing of several previously presented paradigms [Amiet 1979a; 1979b; Miroschedji 2003]).
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Nijhowne, Jeanne. "Politics, religion, and cylinder seals : a study of Mesopotamian symbolism in the second millennium B. C. /." Oxford : J. and E. Hedges, 1999. http://catalogue.bnf.fr/ark:/12148/cb37117277j.

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Hill, Jane A. "Cylinder seal glyptic in predynastic Egypt and neighboring regions /." Oxford : Archaeopress, 2004. http://catalogue.bnf.fr/ark:/12148/cb39186667t.

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MAGNESS-GARDINER, BONNIE SUE. "SEALS AND SEALING IN THE ADMINISTRATION OF THE STATE: A FUNCTIONAL ANALYSIS OF SEALS IN SECOND MILLENNIUM BC SYRIA." Diss., The University of Arizona, 1987. http://hdl.handle.net/10150/184217.

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Cylinder seal impressions occur in many contexts in the ancient Near East. This disssertation focuses specifically on the function of sealing in the manipulation of state resources (land, labor, and goods) in second millennium B.C. Syria. The sources of information utilized in this study include textual references to sealing practices, sealed documents, bullae, and the seals themselves. The archives of Mari, Alalah, and Ugarit are particularly important as they provide textual and archaeological information on seals and sealing within the physical and institutional context of the palace, the center of state administration. Chapter 1 surveys the previous research on seals and sealing and briefly outlines Syrian geography and political history in the second millennium B.C. Chapter 2 examines the physical qualities of the seals--materials, methods of production, distribution and style. Chapter 3 addresses the problem of the physical and institutional context of seal use. A functional division between legal and administrative texts is reflected in the use of seals on them. On both types of documents, however, the use of a seal acknowledges the obligation of the sealer. The nature of that obligation varies with the contents of the text itself. Chapter 4 evaluates the use of seals on legal texts in palace archives. Most of these sealed documents record land grants. The historical trend in second millennium Syria is to an increasing involvement of heads-of-state in granting state land. Other sealed legal documents were kept in palace archives because the participants were in some way associated with the palace. Chapter 5 details the administrative use of seals at Mari. Receipts and expenditures are the most common sealed documents. The use of seals on these texts signals the acceptance by the sealer of responsibility for the goods or actions described therein. The conclusions (Chapter 6) summarize the differences in sealing practices in Mari, Alalah and Ugarit in light of the different historical circumstances and political needs of each state.
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Teissier, Beatrice. "Egyptian iconography on Syro-Palestinian cylinder seals of the Middle Bronze Age (c.1920-1550 B.C.)." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277889.

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Matthews, D. M. "Principles of composition in Near Eastern Glyptic of the later Second Millennium B.C." Thesis, University of Cambridge, 1988. https://www.repository.cam.ac.uk/handle/1810/272362.

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Books on the topic "Seals (Cylinders)"

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Martin, Geoffrey Thorndike. Scarabs, cylinders, and other ancient Egyptian seals: A checklist of publications. Warminster, Wilts, England: Aris & Phillips, 1985.

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2

Blėk, V. B. Khudozhestvennyĭ oblik t︠s︡ilindricheskikh pechateĭ drevneĭ Peredneĭ Azii: Sbornik izbrannykh rabot. Sankt-Peterburg: [s.n.], 2000.

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Werr, Lamia al-Gailani. Studies in the chronology and regional style of old Babylonian cylinder seals. Malibu, Calif: Undena Publications, 1988.

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Yu, Sŭng-ŭi. Maŭm chʻaja kanŭn kil: Yu Sŭng-ŭi chŏnʼgakchip. Sŏul Tʻŭkpyŏlsi: Wŏlgan Sŏye Muninhwa, 2006.

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Collon, Dominque. Near Eastern seals. Berkeley: University of California Press, 1990.

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1963-, Taylor Paul, and Warburg Institute, eds. The iconography of cylinder seals. London: Warburg Institute, 2006.

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Kaptan, Deniz. The Daskyleion bullae: Seal images from the western Achaemenid Empire. Leiden: Nederlands Instituut voor het Nabije Oosten, 2003.

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Kaptan, Deniz. The Daskyleion bullae: Seal images from the western Achaemenid empire. Leiden: Nederlands Instituut voor het Nabije Oosten, 2002.

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Feingold, Rony. Engraved on Stone: Mesopotamian Cylinder Seals and Seal Inscriptions in the Old Babylonian Period. Piscataway, NJ: Gorgias Press, 2014.

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honouree, Porada Edith 1912-1994, and Porada Edith 1912-1994, eds. Edith Porada: Zum 100. Geburtstag = a centenary volume. Fribourg: Academic Press, 2014.

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Book chapters on the topic "Seals (Cylinders)"

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Soto-Barrón, Félix Omar, Martín García-Pérez, Guillermo Urriolagoitia-Sosa, Beatriz Romero-Ángeles, Antonio Hernández-Cerón, Diego Sabas-Gonzalez, José Luis Reyes-Reyes, Martín Guzmán-Baeza, and Belén Alejandra Contreras-Mendoza. "Numerical-Experimental Analysis of the Sealing Efficiency Utilizing Stresses Produced to an Engine Gasket Manufactured by CRS of ¼ Hardness with a Nitrile Coating on Both Sides." In Proceedings of the XV Ibero-American Congress of Mechanical Engineering, 175–81. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-38563-6_26.

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AbstractThe evaluation of a cold assembled engine gasket provides data to analyze if a new design complies with requirements. The main cause of damage is the working temperature. High temperatures are due to refrigerant leakage. In addition to sealing the cylinder, the head gasket seals water and oil passages between the head and the block, preventing engine failure. Different gaskets will fail at different temperature ranges and this is relevant for the structural analysis of the engine. The durability of the gasket and its ability to seal the engine in all condition makes the design a challenge. The non-uniform thermal expansion of the motor makes difficult to design a uniform bead height in the gasket. This makes necessary to include a temperature map in all 3D analyses. This work shows the thermal analysis of an engine head gasket with prestressing of the assembly bolts, the results guarantee an efficient sealing and optimal operation.
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Lu, Li-xin, Tao Deng, Gui-qin Li, and Mitrouchev Peter. "Seal Property of Rubber Cylinder Shoulder in Packer." In Lecture Notes in Electrical Engineering, 157–62. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-5768-7_16.

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Lin, Ange, Zhemin Wu, Jian Wu, and Zhe Li. "Research on Cylinder Friction Behavior Based on Seal Deformation." In Advances in Mechanical Design, 1867–78. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7381-8_117.

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Gopalakrishnan, T. V., C. P. Vendhan, and H. Raman. "Numerical and Experimental Studies on Diffraction of Water Waves Around Three-Cylinder Group." In Computer Modelling of Seas and Coastal Regions, 71–82. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2878-0_6.

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Wang, Xueliang, Meihong Liu, Xiangping Hu, and Junfeng Sun. "The Influence of T Groove Layout on the Performance Characteristic of Cylinder Gas Seal." In Advanced Manufacturing and Automation VIII, 701–7. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2375-1_89.

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Otto, Adelheid. "Law and Justice in Kaneš and its Depiction on Cylinder Seals. A New Interpretation of the Motifs ‘Ball-Staff’ and ‘Pot’." In Kültepe at the Crossroads between Disciplines, 33–53. Turnhout, Belgium: Brepols Publishers, 2024. http://dx.doi.org/10.1484/m.subart-eb.5.136338.

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Martini, Leonard J. "Reciprocating Seals—Pistons and Cylinders." In Practical Seal Design, 108–231. Routledge, 2018. http://dx.doi.org/10.1201/9780203744109-5.

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Eppihimer, Melissa. "Curly-Haired Heroes and the Legacy of Akkadian Seals." In Exemplars of Kingship, 141–92. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190903015.003.0005.

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Cylinder seals potentially played a key role in the visual legacy of Akkadian kingship, but the post-Akkadian history of one Akkadian seal motif, the contest scene, suggests that cylinder seals were not major instruments of image-based responses to and recollections of Akkadian kingship. Instead, the seals’ abundance and accessibility prevented a strict monopolization of their imagery by kings and other agents of cultural memory. Foremost, the colossal lion-wielding heroes from the Neo-Assyrian palace of Sargon II at Khorsabad do not use imagery from Akkadian seals to allude to the historical Akkadian kings, but instead represent a timeless cosmos at home in the Assyrian visual tradition. The tendency to view the Khorsabad heroes as royal figures derives in part from nineteenth-century associations with a legendary king, Gilgamesh.
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Brandl, Baruch. "CYLINDER SEALS." In Megiddo V, 993–1010. Penn State University Press, 2013. http://dx.doi.org/10.5325/j.ctv2321hmw.29.

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"Cylinder Seals." In The Origins of the Art and Practice of Professional Writing, 13–35. SUNY Press, 2024. http://dx.doi.org/10.1515/9781438497303-006.

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Conference papers on the topic "Seals (Cylinders)"

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Xia, Jicheng, and William K. Durfee. "Experimentally Validated Models of O-Ring Seals for Tiny Hydraulic Cylinders." In ASME/BATH 2014 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/fpmc2014-7825.

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To enable simulation of tiny hydraulic systems, including predicting system efficiency, it is necessary to determine the effect of the hydraulic cylinder piston seal. For tiny cylinders whose bore is less than 10 mm, O-ring seals are convenient. Simplified models for the O-ring were used to describe piston leakage and friction and based on the models, the force and volumetric efficiencies for tiny cylinders were predicted for a range of steady state operating conditions. To validate the models, a test stand was constructed to collect experimental data for 4, 6 and 9 mm bore cylinders, which were in the form of a vertical ram with a single O-ring seal. The ram was fully extended and put under load. A needle valve was then cracked to cause the ram to descend at different speeds. Pressure, load and velocity were recorded and the data used to calculate cylinder efficiencies, which were then compared to model predictions. The model and the experiment showed essentially zero leakage. The experimental force efficiency had good agreement with the model over a range of operating conditions. The study showed that simple O-ring models for tiny hydraulic cylinders suffice for building system level simulation models.
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Gu¨l, Cihat, and Vedat Temiz. "Effect of Macro Geometry on the Performance Characteristics of Reciprocating Seals." In ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2010. http://dx.doi.org/10.1115/esda2010-24280.

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Since reciprocating motion is commonly encountered in many industrial applications like hydraulic cylinders, performance characteristics of reciprocating seals is important for design of such systems. In this paper, some reciprocating seals having different macro geometry have been investigated experimentally. An experimental setup has been developed to perform as a hydraulic cylinder. Experiments have been carried out with different types of hydraulic seals which are made of NBR. Through the experiments, variation of the friction force applied to the hard chrome coated piston rod by seals, have been measured under various oil pressures in the main cylinder. In the second step of experiments, the amount of leakage from the seal in one out-stroke of the piston rod has been determined for various oil pressures. The effect of oil viscosity to the performance characteristic of reciprocating seals has also been studied. As a result of systematical experiments, the variations of friction force and leakage amount with oil pressure for various types of reciprocating seals have been obtained.
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Angerhausen, Julian, Hubertus Murrenhoff, Bo N. J. Persson, and Katharina Schmitz. "Physically Motivated Simulation of Dynamic Hydraulic Seals." In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1635.

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Abstract Seals are crucial machine elements, for example in hydraulic cylinders. However, especially in regard to dynamic seals, the theoretical understanding of the sealing mechanism is still insufficient. A physically motivated simulation can help to gain a more detailed understanding. In this contribution a elastohydrodynamic (EHD) seal simulation is presented. It is directly implemented in the commercial Software ABAQUS. The fluid film is considered by implementing the Reynolds equation. For a physically motivated simulation Persson’s theory of contact mechanics and rubber friction is used to calculate the solid contribution to the total friction of a hydraulic seal. Simulations for an oscillating motion of a cylinder rod, sealed by an O-ring seal, are carried out for different velocities and pressures. A qualitative comparison between measurement and simulation is provided. Hysteresis effects and the contributions from both, adhesive and viscoelastic friction to the total solid friction are investigated. The physical origin of these effects is discussed in order to provide a detailed understanding of the dynamic sealing mechanism.
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Angerhausen, Julian, Hubertus Murrenhoff, Leonid Dorogin, Michele Scaraggi, Boris Lorenz, and Bo N. J. Persson. "Influence of Anisotropic Surfaces on the Friction Behaviour of Hydraulic Seals." In BATH/ASME 2016 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fpmc2016-1739.

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In the modelling of the leakage rate, friction force or contact pressure distribution of hydraulic seals is quite common to assume the mating surfaces to be characterized by a random isotropic roughness. However, due to different surface finishing methods, such as coating, grinding or polishing, roughness with anisotropic characteristics is often generated. In this paper a first experimental investigation of the influence of such anisotropic surfaces on the sliding friction is provided. For this purpose, a test rig has been designed and set up to investigate a soft, lubricated line contact representative of a generic reciprocating hydraulic seal. In particular, an O-ring cord is squeezed into contact with a steady rotating rigid cylinder. In order to adopt a cylinder-on-flat configuration, the diameter of the rigid cylinder is chosen to be significantly larger than the O-ring (cross-section) diameter. Furthermore, three cylinders with different surfaces are used: One (sandblasted) isotropic surface and two anisotropic surfaces roughness, scratched perpendicularly or along the azimuthal direction. Therefore, under temperature control, Stribeck curves have been measured at different squeezing loads and surface roughness, showing a neat influence of the surface roughness characteristics on the friction force. Finally, the experimental results are compared with the predictions provided by a recent mean field theory of soft contact (e.g. rubber) lubrication.
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Millward, J. A., and M. F. Edwards. "Windage Heating of Air Passing Through Labyrinth Seals." In ASME 1994 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/94-gt-056.

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The viscous drag on rotating components in gas turbine engines represents both a direct loss of power from the cycle and an input of heat into the secondary (cooling) air system. Hotter cooling air in turn means increased flow requirements. The effects of windage on performance are therefore compounded. To facilitate accurate temperature predictions of highly stressed components, information is needed on windage characteristics of all elements in the secondary cooling system. Much information is available in the literature for discs, cones, cylinders, bolts etc but little has been published on windage heating in high speed seals. Results are presented for experiments carried out (at representative non-dimensional conditions) on different designs of labyrinth seals. The results are compared with values calculated from the simple momentum balance theory suggested by McGreeham and Ko (1989) and with several values determined from CFD analysis.
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Hurd, Paul, Frank Truckenmueller, Norbert Thamm, Helmut Pollak, Matthias Neef, and Mathias Deckers. "Modern Reaction HP/IP Turbine Technology Advances and Experiences." In ASME 2005 Power Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pwr2005-50085.

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Modern steam turbines of the author’s company are based on advanced technology such as high efficiency seals, 3D blading, single inner cylinders, and advanced materials. These technologies result in a compact opposed-flow HP/IP combined cylinder design with high long-term efficiency, reliability, and availability. This paper will illustrate the features, benefits, and operational experience of large steam turbines with advanced technologies using an opposed-flow HP/IP cylinder. The paper will also address the relative performance of this type of steam turbine against its predecessors. Specific examples will be examined: 350 MW fossil units in the Asian market, a typical 250 MW combined cycle steam turbine in the American market, a 700 MW three-cylinder class design for conventional steam plants developed for the global coal market, and a 600 MW steam turbine upgrade.
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Peng, Chao, Sibo Jin, Shuang Tan, Guibin Tan, Xing Huang, and Xiaoping Ouyang. "The Effect of High Frequency Pressure Pulse on the Friction and Leakage Performance of Seals in Aviation Hydraulic Cylinders." In 2023 9th International Conference on Fluid Power and Mechatronics (FPM). IEEE, 2023. http://dx.doi.org/10.1109/fpm57590.2023.10565528.

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von der Ohe, Christian B., Roy Johnsen, and Nuria Espallargas. "Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79039.

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Hydraulic cylinders are used for many vital applications on offshore installations. For the long stroke cylinders used in the direct acting riser tensioning application the piston rod surface is exposed to severe degradation; combining corrosion, wear and mechanical stress. Direct acting riser tensioning systems are often used during ultra-deepwater offshore drilling, when exploring for oil and gas. These direct acting riser tensioning systems usually consist of 6 long stroke hydraulic cylinders located at the splash zone level. These cylinders ensure constant tensioning of the drilling riser as the drilling vessel is operated in ultra deep waters up to 3000 meters compensating for heave due to sea waves and tide. The direct acting tensioning systems have been in operation since the late 1990’s, but the system integrity and service life has so far not been acceptable. Operational experience shows that the thermal sprayed coatings applied on these piston rods have dramatically shorter life than predicted by qualification tests programs. The consequence of the failing rod surface is sudden coating damage such as pits and flaking which further damages the seals in the packing flange. As a result hydraulic oil leakages occurs, thus polluting the environment and in the worst case leads to loss of the tensioning in the riser causing subsequent drilling down time and eventual riser breakage and blowout. This paper will provide a generic summary of operational experience, development and degradation issues of direct-acting riser tensioning cylinder piston rod surfaces. Several case histories are included to highlight piston rod failures and an evaluation of alternative concepts to improve service life of piston rods is given.
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Ericson, Liselott, and Jonas Forssell. "A Novel Axial Piston Pump/Motor Principle With Floating Pistons: Design and Testing." In BATH/ASME 2018 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/fpmc2018-8937.

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This paper presents the first prototype of a novel axial piston pump/motor of slipper type. The pistons are floating in the cylinders and hence the name floating piston pump. The novel pump design fills a gap in the traditional pump design. The pump is made to fit the automobile requirements to use fluid power in a more prominent manner. One of the expected benefits of this design is its simplicity and therefore the machine does not require high manufacturing capabilities. The production cost is expected to be low. The machine is designed with high number of pistons, which leads to a pump/motor with low noise level. The displacement angle is small, 8 degrees, which leads to low piston speeds with its benefits. The main challenge in the design is the piston seal configuration. The seals will both, deform (ovality) and move in a circle relative to the pistons. The paper discusses design considerations and proposes a design. The efficiency measurement of the first prototype is in level of a series produced slipper type machine at its sweet spot.
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Fripp, Michael, Rutger Evers, Stephen Greci, Brandon Least, Christopher Pelto, Christopher Rodriguez, Taylor Stein, Lori Wiltz, and Allan Zhong. "Novel Expanding Metal Alloy for Non-Elastomeric Sealing and Anchoring." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210273-ms.

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Abstract A new class of expanding isolation systems has been enabled by the creation of a uniquely engineered expanding metal alloy. The engineered metal alloy expands downhole and chemically transforms from a metal alloy into a rock-like seal. This novel metal alloy results in a sealing system that combines the operational simplicity of swellable elastomers with the robustness of non-elastomeric seals and includes an anchoring capability to the seal. Swellable elastomers have provided effective zonal isolation since their introduction in the early 2000s. Swellable elastomers expand by absorbing fluids within the matrix of the elastomer. This absorption causes the swellable elastomer to expand in size and results in a high-pressure seal for zonal isolation. Despite the widespread success of swellable packers, for some applications a non-elastomeric seal for zonal isolation is preferred and more reliable. Applications benefit from non-elastomeric seals for zonal isolation due to temperature, pressure, or chemical compatibility reasons. Other applications, such as fluid injection operations, require anchoring capabilities which can be challenging with swellable elastomers. The new engineered metal alloy chemically reacts with the downhole water-based fluids and expands into a strong rock-like material that provides non-elastomeric zonal isolation with pressure and anchoring capabilities exceeding swellable technology at higher expansion ratios. In addition, water swellable elastomers are not suitable for applications which have a high salinity brine or produced water as the setting fluid. By contrast the expanding metal alloy chemical reaction is enhanced by increasing salinity. The expanding metal alloy bonds with the water-based fluid in the wellbore and this chemical reaction causes the metal to expand into a rock-like material. The chemical reaction results in a new material that is larger than the original alloy. Unlike a swellable elastomer which absorbs fluids (a purely physical process governed by thermodynamics and osmosis), the metal alloy's molecular structure chemically transforms, incorporating the water molecules to create a new material. The metal alloy can expand over 80% as it transforms into its final state as a rock-like seal. Extensive small-scale and full-scale tests were conducted to reliably and consistently map the metamorphosis from the engineered metal alloy into the rock-like material. These tests required developing new methods for testing the material including designing new test fixtures and new test procedures. Testing proved seals were created in smooth cylinders as well as in irregular shapes and with a wide range of brine types and brine concentrations. The result is an expanding engineered alloy that creates a robust and durable seal with anchoring capabilities across a wide range of downhole conditions. A novel non-elastomeric zonal isolation system is composed of a new expanding metal alloy that expands in water-based wellbore fluid, completion fluid, or formation fluid. The performance of this new material has been demonstrated through experimental testing. This paper discusses the development and initial testing of this new expanding metal and the process of forming a robust and reliable downhole seal with anchoring capabilities.
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Reports on the topic "Seals (Cylinders)"

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Davis, S., and D. Underwood. Cracking of 1-inch UF sub 6 cylinder valve packing nuts: The effects of packing nut torque on stem seal leakage and packing nut stress due to thermal expansion of the PTFE stem seal rings. Office of Scientific and Technical Information (OSTI), August 1989. http://dx.doi.org/10.2172/5684105.

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Miller. L51699 Diverless Pipeline Repair Clamp Phase III. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 1993. http://dx.doi.org/10.55274/r0010218.

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Offshore oil and gas developments are underway for water depths beyond which divers can function. The economic lifelines of these projects are the pipelines which will transport the products to shore. In preparation for the day when one of these pipelines will require repair because of a leak, the Pipeline Research Committee of Pipeline Research Council International, Inc. is funding research directed at developing diverless pipeline repair capabilities. This Report summarizes the results of the third and final phase of this project. Phase III work included design, manufacture, and dry testing of 1) a one-half scale model of a 12"� repair clamp, 2) a full-scale bolt test fixture to demonstrate boltcontainment and startup under realistic misalignment of the clamp halves, and 3) a full-scale one-way cylinder for end seal activation. Engineering drawings for a 12" - 900# (324 mm, 15.3 mPa) diverless repair clamp package were also produced, and are provided with this report in Appendix B. Phase III also included a study commissioned from Oceaneering directed at defining the interfaces of the clamp package and the ROV, including suggested procedures for deployment and positioning of the clamp package on the pipeline. Issues regarding bolt make-up by the ROV were also studied in detail and limitations in bolting capability were outlined.
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