Ändra sökning
Länk till posten
Permanent länk

Direktlänk
Publikationer (10 of 23) Visa alla publikationer
Nyberg, E. (2023). AI-tools for competence matching. In: : . Paper presented at The SARC annual meeting 2023, June 8-9, 2023, Stockholm, Sweden. Stockholm
Öppna denna publikation i ny flik eller fönster >>AI-tools for competence matching
2023 (Engelska)Konferensbidrag, Enbart muntlig presentation (Övrigt vetenskapligt)
Ort, förlag, år, upplaga, sidor
Stockholm: , 2023
Nationell ämneskategori
Datorsystem Språkteknologi (språkvetenskaplig databehandling)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-99132 (URN)
Konferens
The SARC annual meeting 2023, June 8-9, 2023, Stockholm, Sweden
Tillgänglig från: 2023-07-03 Skapad: 2023-07-03 Senast uppdaterad: 2024-02-08Bibliografiskt granskad
Kröll, M., Grundtner, R., Pagano, F., Nyberg, E., Heino, V., Spaltmann, D. & Gradt, T. (2022). Effects of harmonised procedures on tribological testing. In: : . Paper presented at 7th World Tribology Congress (WTC 2022), Lyon, France, July 10-15, 2022 .
Öppna denna publikation i ny flik eller fönster >>Effects of harmonised procedures on tribological testing
Visa övriga...
2022 (Engelska)Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-99128 (URN)
Konferens
7th World Tribology Congress (WTC 2022), Lyon, France, July 10-15, 2022 
Projekt
i-TRIBOMAT
Forskningsfinansiär
EU, Horisont 2020, 814494
Tillgänglig från: 2023-07-03 Skapad: 2023-07-03 Senast uppdaterad: 2024-02-09Bibliografiskt granskad
Kröll, M., Grundtner, R., Newrkla, K., Spaltmann, D., Pagano, F., Nyberg, E. & Heino, V. (2022). On the challenges in achieving comparable and reproducible tribological model tests. In: Book of Abstracts: SICT 2022 / Plasma Tech 2022 / Tribology 2022 Hybrid Joint Conferences: . Paper presented at Surfaces, Interfaces and Coatings Technologies, Plasma Processing and Technology and Tribology 2022 Joint International Conferences (SICT / Plasma Tech / Tribology 2022), Barcelona, Spain [Hybrid], April 27-29, 2022 (pp. 91).
Öppna denna publikation i ny flik eller fönster >>On the challenges in achieving comparable and reproducible tribological model tests
Visa övriga...
2022 (Engelska)Ingår i: Book of Abstracts: SICT 2022 / Plasma Tech 2022 / Tribology 2022 Hybrid Joint Conferences, 2022, s. 91-Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-99126 (URN)
Konferens
Surfaces, Interfaces and Coatings Technologies, Plasma Processing and Technology and Tribology 2022 Joint International Conferences (SICT / Plasma Tech / Tribology 2022), Barcelona, Spain [Hybrid], April 27-29, 2022
Projekt
i-TRIBOMAT
Forskningsfinansiär
EU, Horisont 2020, 814494
Tillgänglig från: 2023-07-03 Skapad: 2023-07-03 Senast uppdaterad: 2024-02-09Bibliografiskt granskad
Kröll, M., Grundtner, R., Newrkla, K., Spaltmann, D., Pagano, F., Pinedo, B., . . . Ronkainen, H. (2022). Trusted tribological materials characterisation services. In: Topolovec-Miklozic, K; Pauschitz, A; Fatemi, A (Ed.), 23rd International Colloquium Tribology: Industrial and automotive lubrication - Conference proceedings 2022. Paper presented at 23rd International Colloquium Tribology, Stuttgart/Ostfildern, Germany, January 25-27, 2022 (pp. 503-505).
Öppna denna publikation i ny flik eller fönster >>Trusted tribological materials characterisation services
Visa övriga...
2022 (Engelska)Ingår i: 23rd International Colloquium Tribology: Industrial and automotive lubrication - Conference proceedings 2022 / [ed] Topolovec-Miklozic, K; Pauschitz, A; Fatemi, A, 2022, s. 503-505Konferensbidrag, Muntlig presentation med publicerat abstract (Refereegranskat)
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-99124 (URN)
Konferens
23rd International Colloquium Tribology, Stuttgart/Ostfildern, Germany, January 25-27, 2022
Forskningsfinansiär
EU, Horisont 2020, 814494 i-TRIBOMAT
Anmärkning

ISBN for host publication: 978-3-8169-3547-6

Tillgänglig från: 2023-07-03 Skapad: 2023-07-03 Senast uppdaterad: 2024-02-08Bibliografiskt granskad
Martin-Torres, J., Zorzano Mier, M.-P., Nyberg, E., Vakkada Ramachandran, A. & Bhardwaj, A. (2021). Brine-Induced Tribocorrosion Accelerates Wear on Stainless Steel: Implications for Mars Exploration. Advances in Astronomy, 2021, Article ID 6441233.
Öppna denna publikation i ny flik eller fönster >>Brine-Induced Tribocorrosion Accelerates Wear on Stainless Steel: Implications for Mars Exploration
Visa övriga...
2021 (Engelska)Ingår i: Advances in Astronomy, ISSN 1687-7969, E-ISSN 1687-7977, Vol. 2021, artikel-id 6441233Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Tribocorrosion is a degradation phenomenon of material surfaces subjected to the combined action of mechanical loading and corrosion attack caused by the environment. Although corrosive chemical species such as materials like chloride atoms, chlorides, and perchlorates have been detected on the Martian surface, there is a lack of studies of its impact on materials for landed spacecraft and structures that will support surface operations on Mars. Here, we present a series of experiments on the stainless-steel material of the ExoMars 2020 Rosalind Franklin rover wheels. We show how tribocorrosion induced by brines accelerates wear on the materials of the wheels. Our results do not compromise the nominal ExoMars mission but have implications for future long-term surface operations in support of future human exploration or extended robotic missions on Mars.

Ort, förlag, år, upplaga, sidor
Hindawi Publishing Corporation, 2021
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning) Rymd- och flygteknik
Forskningsämne
Atmosfärsvetenskap; Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-89056 (URN)10.1155/2021/6441233 (DOI)000741080300001 ()2-s2.0-85122873012 (Scopus ID)
Anmärkning

Validerad;2022;Nivå 2;2022-01-31 (johcin);

Special Issue: Mars Climate Evolution, Habitability, Astrobiology, and Resources

Tillgänglig från: 2022-01-31 Skapad: 2022-01-31 Senast uppdaterad: 2022-04-12Bibliografiskt granskad
Nyberg, E. (2021). Ionic Liquid Lubricants for Space Applications. (Doctoral dissertation). Luleå, SE: Luleå University of Technology
Öppna denna publikation i ny flik eller fönster >>Ionic Liquid Lubricants for Space Applications
2021 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Lubrication is critical to the efficient and reliable operation of machine elements such as gears, bearings, or any other moving mechanical assembly (MMA). On Earth, machine designers are accustomed to the access of a wide range of liquid lubricants that enable predictable and reliable long-term operations of high performance MMA. In space applications on the other hand, engineers are constrained to a comparatively limited choice of lubricant candidates that can meet the stringent demands of tribosystems operating in a space environment. At the same time, repair or maintenance are seldom options that are possible in space, and consequently lubricant failures are potentially critical. As international space agencies are converging on the goal of establishing a permanently crewed lunar Gateway for human presence on the Moon and eventually onwards to Mars, there is a need for radical improvements in many aspects of space exploration technology, including space tribology and space grade lubricants.  

Liquid lubricants are enablers of high performance. A thin fluid film – even in the submicron scale – is often sufficient to separate opposing surface boundaries from direct contact, and thereby prevent excessive friction and wear. Liquid lubricants are therefore attractive for use in space mechanisms. Unfortunately, liquid lubricants must overcome several issues in order to be effective in the space environment. Vacuum, microgravity, and low temperatures are all factors that oppose the effective supply of liquid lubricants into the tribological contact of MMA. If the tribological contact becomes starved of oil, the surfaces enter the boundary lubrication regime where seizure is an ever-present threat. 

There are very few types of fluids available that meet the stringent space grade lubricant requirements. Perfluoropolyalkylethers (PFPE), or multiply alkylated cyclopentanes (MAC) are two fluids with significant heritage in space applications. These fluids are currently employed as lubricants in a wide range of space applications, as they are rare examples of fluids that meet the high demands on resistance to vacuum outgassing. Unfortunately, these compounds are susceptible to degradation under boundary lubrication conditions, and unlike conventional lubricants employed on Earth, these fluids have poor compatibility with the boundary lubrication additives that are commonly employed in conventional oils. 

Ionic liquids (ILs) have emerged as potential liquid lubricant candidates in space. These synthetic fluids are composed of anions and cations. The resulting ionic interaction enables the substance to have low vapor pressure with relatively low molecular weight. For this reason, ILs have been advocated as one of the candidate lubricants for space applications. When employing ILs as lubricants, the ionic charge provides Coulombic interaction with surfaces to enable the formation of a boundary lubricating film. This is an important part of the IL lubricating mechanism, but successful lubricant performance requires integrating the lubricant candidate into the tribosystem, taking into account operating conditions and environment. Therefore, the boundary film formation should be tunable to the application at hand. Ionic liquids are designable fluids, with properties dependent on the combination of anion and cation as well as incorporated functional groups. 

Based on this background, this work focused on evaluating the feasibility of employing ionic liquid lubricants for space applications. In this thesis, the molecular design of an IL lubricant was described Paper [1], and the resulting hydrocarbon-mimicking ionic liquid (P-SiSO) was evaluated in tribological experiments in boundary lubricated conditions. Boundary film formation by neat P-SiSO was studied  in Paper [2], and in Paper [3] we describe the use of P-SiSO as a multipurpose performance ingredient in MAC. A test methodology was devised in Paper [4] in order to evaluate the lubrication performance under component scale experiments in space relevant conditions. The designed ionic liquid lubricant was evaluated in Paper [5] by the specific methodology. Advanced surface analysis was employed to understand the tribo-mechanism of P-SiSO in both the model scale experiments as well as the component scale. The lubricated surfaces were analyzed in terms of surface topography- and chemistry, and mechanisms of lubrication are discussed. A highly effective boundary film based on ionic adsorption and formation of silicate was observed by these ionic liquids. This thesis demonstrates the feasibility of employing ionic liquids for lubrication of moving mechanical assemblies in space applications. 

Ort, förlag, år, upplaga, sidor
Luleå, SE: Luleå University of Technology, 2021. s. 60
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-82223 (URN)978-91-7790-747-3 (ISBN)978-91-7790-748-0 (ISBN)
Disputation
2021-02-23, A-109, Luleå University of Technology, Lulea, 09:00 (Engelska)
Opponent
Handledare
Projekt
Rymdforskarskolan
Tillgänglig från: 2021-01-11 Skapad: 2021-01-08 Senast uppdaterad: 2021-03-26Bibliografiskt granskad
Nyberg, E., Schneidhofer, C., Pisarova, L., Dörr, N. & Minami, I. (2021). Ionic Liquids as Performance Ingredients in Space Lubricants. Molecules, 26(4), Article ID 1013.
Öppna denna publikation i ny flik eller fönster >>Ionic Liquids as Performance Ingredients in Space Lubricants
Visa övriga...
2021 (Engelska)Ingår i: Molecules, ISSN 1431-5157, E-ISSN 1420-3049, Vol. 26, nr 4, artikel-id 1013Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Low vapor pressure and several other outstanding properties make room-temperature ionic liquids attractive candidates as lubricants for machine elements in space applications. Ensuring sufficient liquid lubricant supply under space conditions is challenging, and consequently, such tribological systems may operate in boundary lubrication conditions. Under such circumstances, effective lubrication requires the formation of adsorbed or chemically reacted boundary films to prevent excessive friction and wear. In this work, we evaluated hydrocarbon-mimicking ionic liquids, designated P-SiSO, as performance ingredients in multiply alkylated cyclopentane (MAC). The tribological properties under vacuum or various atmospheres (air, nitrogen, carbon dioxide) were measured and analyzed. Thermal vacuum outgassing and electric conductivity were meas- ured to evaluate ‘MAC & P-SiSO’ compatibility to the space environment, including the secondary effects of radiation. Heritage space lubricants—MAC and perfluoroalkyl polyethers (PFPE)—were employed as references. The results corroborate the beneficial lubricating performance of incorporating P-SiSO in MAC, under vacuum as well as under various atmospheres, and demonstrates the feasibility for use as a multifunctional additive in hydrocarbon base oils, for use in space exploration applications.

Ort, förlag, år, upplaga, sidor
Switzerland: MDPI, 2021
Nyckelord
Space-tribology, tribofilm, silicate boundary film, multiply alkylated cyclopentanes (MAC), anti-wear, friction modifier, lubricant additive, conductivity improver
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-82929 (URN)10.3390/molecules26041013 (DOI)000624188700001 ()33672952 (PubMedID)2-s2.0-85102716552 (Scopus ID)
Projekt
Rymdforskarskolan
Anmärkning

Validerad;2021;Nivå 2;2021-03-02 (johcin);

Finansiär: Taiho Kogyo Research Foundation (TTRF); Austrian COMETProgram InTribology1 (872176)

Tillgänglig från: 2021-02-12 Skapad: 2021-02-12 Senast uppdaterad: 2023-08-28Bibliografiskt granskad
Nyberg, E., Llopart I Cervelló, D. & Minami, I. (2021). Tribology in Space Robotic Actuators: Experimental Method for Evaluation and Analysis of Gearboxes. Aerospace, 8(3), Article ID 75.
Öppna denna publikation i ny flik eller fönster >>Tribology in Space Robotic Actuators: Experimental Method for Evaluation and Analysis of Gearboxes
2021 (Engelska)Ingår i: Aerospace, ISSN 2226-4310, Vol. 8, nr 3, artikel-id 75Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Liquid lubricants are critical to enable long-life operation of high-performance machinery, such as geared actuators employed in robotics. In space applications, actuator gearboxes must operate in low temperatures, where liquid lubricants face inherent problems related to low temperature rheology. Heaters are relied upon to provide acceptable gearbox temperatures. Unfortunately, heating is energy-intense and does not scale well with increasing mechanism mass and performance. Effective boundary lubrication (BL), on the other hand, can minimize problems of low temperature rheology. BL relies on tribofilm formation over conventional fluid film separation. Effective space grade boundary lubricants can potentially allow for drastically reduced amounts of oil and the accompanying rheological problems. In this work, we describe the design of a methodology to evaluate and analyze tribology of actuator gearboxes operated under cryogenic oil-starved conditions in N2 atmosphere. The devised methodology enables research pertinent to space actuator tribology by accelerated testing and advanced analysis, as demonstrated by a lubricant candidate case study. Complementary microscopy techniques are discussed, and a novel methodology devised for gear internal microstructure analysis by X-ray microtomography (XMT) is presented.

Ort, förlag, år, upplaga, sidor
MDPI, 2021
Nyckelord
tribotesting, starved lubrication, cryogenic lubrication, space-tribology, COTS, X-ray microtomography, computed tomography, XMT, CT-scan, lab-to-field upscaling
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-83514 (URN)10.3390/aerospace8030075 (DOI)000633205600001 ()2-s2.0-85103178930 (Scopus ID)
Anmärkning

Validerad;2021;Nivå 2;2021-04-08 (alebob);

Finansiär: Taiho Kogyo Research Foundation; Austrian COMET-Program InTribology1 (872176)

Tillgänglig från: 2021-04-08 Skapad: 2021-04-08 Senast uppdaterad: 2021-04-14Bibliografiskt granskad
Nyberg, E., Hansen, J. & Minami, I. (2020). Lubrication Concept Evaluated for Geared Actuators under Starved Conditions. In: Edward A. Boesiger (Ed.), 45th Aerospace Mechanisms Symposium: . Paper presented at 45th Aerospace Mechanisms Symposium, Houston, Texas, May 13-15, 2020 (pp. 255-260). National Aeronautics and Space Administration (NASA)
Öppna denna publikation i ny flik eller fönster >>Lubrication Concept Evaluated for Geared Actuators under Starved Conditions
2020 (Engelska)Ingår i: 45th Aerospace Mechanisms Symposium / [ed] Edward A. Boesiger, National Aeronautics and Space Administration (NASA) , 2020, s. 255-260Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

Lubricant starvation leads to the risk of a shift in the lubrication regime from (elasto)hydrodynamic towards boundary conditons. Effective tribofilm formation is essential to limit surface damages in these conditions, but additive technology for space-grade lubricants is lacking. This work evaluates the feasibility of a novel type of multifunctional ionic liquid lubricant, for use with multiply alkylated cyclopentane (MAC). Actuator gearboxes are operated under starved conditions in nitrogen atmosphere to evaluate the effectiveness of the tribofilm forming lubricant (designated P-SiSO). The effectiveness of P-SiSO was evaluated from macro to micro scale in both surface and sub-surface analysis by use of microscopy (optical, interferometric, SEM) and X-ray microtomography (XMT), and mechanisms of effective lubrication are discussed. 

Ort, förlag, år, upplaga, sidor
National Aeronautics and Space Administration (NASA), 2020
Nyckelord
tribology, space mechanisms, space lubricant, x-ray microtomography
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-82004 (URN)
Konferens
45th Aerospace Mechanisms Symposium, Houston, Texas, May 13-15, 2020
Projekt
Rymdforskarskolan
Anmärkning

Finansiär: K2 XTribology (849109); The Taiho Kogyo Research Foundation

Tillgänglig från: 2020-12-15 Skapad: 2020-12-15 Senast uppdaterad: 2023-09-05Bibliografiskt granskad
Pirker, F., Tóth, I., Cihak-Bayr, U., Grundtner, R., Vernes, A., Benedicto, J., . . . Amigorena, I. (2020). Tribological Characterisation Services for Materials – i-TRIBOMAT. Paper presented at 22nd International Colloquium Tribology, 28-30 January, 2020, Stuttgart/Ostfildern, Germany. Tribologie und Schmierungstechnik, 67(5-6), 35-50
Öppna denna publikation i ny flik eller fönster >>Tribological Characterisation Services for Materials – i-TRIBOMAT
Visa övriga...
2020 (Engelska)Ingår i: Tribologie und Schmierungstechnik, ISSN 0724-3472, Vol. 67, nr 5-6, s. 35-50Artikel i tidskrift (Refereegranskat) Published
Abstract [de]

Um den Entwicklungsprozess von neuen Komponenten zu beschleunigen, ist die Vorrausage der Eigenschaften der eingesetzten Werkstoffe im Betrieb der Komponenten von enormer Bedeutung. Um neue Werkstoffe hinsichtlich Ihrer Performance (in einer Komponente) bewerten zu können, ist deshalb die Entwicklung neuer innovativer Methoden notwendig. Diese Methoden können auch unter dem Begriff „lab-to-field“ oder „materials“ – up-scaling zusammengefasst werden. D. h. Werkstoffe werden im Labor charakterisiert, und deren Eigenschaften mittels z.B. Simulation auf die Komponentenperformance hochskaliert (upscaling). i-TRIBOMAT ist ein EU gefördertes Projekt (H2020, GA Nr. 814494) mit dem Ziel ein Open Innovation Test Bed für tribologische Werkstoffcharakterisierung aufzubauen und ent-sprechende Services von der tribologischen Charakterisierung neuer Werkstoffe bis hin zu Simulationsmodellen zur Vorrausage der Perfomance von Komponenten der Industrie anzubieten. Durch die Bündelung von Knowhow und Infrastruktur zu Charakterisierung sowie den Aufbau einer digitalen Plattform, wird i-TRIBOMAT das weltgrößte Open Innovation Test Bed für tribologische Werkstoffcharakterisierung.

Abstract [en]

The prediction of the properties of the materials used in the operation of components is of enormous importance, in order to accelerate the development process of new components. To evaluate new materials in terms of their performance (in a component), the development of new innovative methods is necessary. These methods can also be summarized under the term lab-to-field or materials – upscaling, meaning materials being characterised in a laboratory and their properties being upscaled to the component performance by means of e.g. simulation. i-TRIBOMAT is a EU funded project (H2020, GA Nr. 814494) aiming at building an Open Innovation Test Bed for tribological material characterization and offering corresponding services from tribological characterization of new materials to simulation models for predicting the performance of industrial components. By bundling the infrastructure, know-how for characterization and building a digital platform, i-TRIBOMAT becomes the world’s largest open innovation test bed for tribological material characterization.

Ort, förlag, år, upplaga, sidor
Expert Verlag, 2020
Nyckelord
lab-to-field upscaling, tribology, intelligent tribological material characterization, materials database, shared infrastruture, tribo-analytics, Lab-to-field up-scaling, Tribologie, intelligente tribologische Werkstoffcharakterisierung, Werkstoff-datenbank, geteilte Infrastruktur, Tribo-Analytik
Nationell ämneskategori
Tribologi (ytteknik omfattande friktion, nötning och smörjning)
Forskningsämne
Maskinelement
Identifikatorer
urn:nbn:se:ltu:diva-82855 (URN)10.30419/TuS-2020-0026 (DOI)2-s2.0-85100316194 (Scopus ID)
Konferens
22nd International Colloquium Tribology, 28-30 January, 2020, Stuttgart/Ostfildern, Germany
Forskningsfinansiär
EU, Horisont 2020, 814494
Anmärkning

Godkänd;2021;Nivå 0;2021-02-10 (alebob);Konferensartikel i tidskrift

Tillgänglig från: 2021-02-10 Skapad: 2021-02-10 Senast uppdaterad: 2023-11-27Bibliografiskt granskad
Organisationer
Identifikatorer
ORCID-id: ORCID iD iconorcid.org/0000-0002-0851-8475

Sök vidare i DiVA

Visa alla publikationer