Endre søk
Begrens søket
1 - 13 of 13
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 1.
    Alexandersson, Martin
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Maritima avdelningen. Chalmers University of Technology, Sweden.
    Mao, Wengang
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas W
    Chalmers University of Technology, Sweden.
    Analysis of roll damping model scale data2021Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 16, nr S1, s. 85-92Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Having an accurate prediction of ship roll damping is crucial when analysing roll motions. In this paper, the simplified Ikeda method (SI-method) is compared with the original Ikeda method. The methods are compared using results from a database of roll decay tests carried out on modern merchant ships and a smaller set of predictions in which the original Ikeda method was used. It was found that most of the ships in the database had dimensions outside the limits of the SI-method. Thus, the SI-method showed poor agreement with model tests outside its limits but acceptable agreement for ships within limits. It was found that the deviations were caused by extrapolation errors of the wave-damping in the SI-method. Two ways to improve the accuracy of the SI-method were proposed based on regression, which gave about the same accuracy as the original Ikeda method. © 2021 The Author(s).

  • 2.
    Alexandersson, Martin
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Maritima avdelningen. Chalmers University of Technology, Sweden.
    Zhang, Daiyong
    Chalmers University of Technology, Sweden.
    Mao, Wengang
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas W
    Chalmers University of Technology, Sweden.
    A comparison of ship manoeuvrability models to approximate ship navigation trajectories2023Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 18, nr 4, s. 550-557Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    It is essential to describe a ship’s manoeuvrability for various applications, e.g. optimal control of unmanned surface vehicles (USVs). In this study, the capability of two recognised manoeuvrability models to predict ships’ trajectories is investigated based on both simulation and open-water experiment test data. The parameters of these models are estimated by a statistical learning method. The goodness of the two estimated models for describing a merchant ship’s manoeuvrability is first studied using her manoeuvring simulation data. Then, experimental manoeuvring tests to use a USV in open water with wind and drifting effects are used to check the conventional model identification procedures. Finally, some modifications and adjustments are proposed to improve the conventional procedures. It shows that the proposed procedures can accurately derive the ship’s manoeuvrability based on experimental data. © 2022 The Author(s). 

  • 3.
    Arvidson, Magnus
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Brand och Säkerhet.
    Mindykowski, Pierrick
    RISE Research Institutes of Sweden, Säkerhet och transport, Brand och Säkerhet.
    Fire testing of alternative fixed fire-extinguishing systems for ro-ro spaces onboard ships2023Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 18, nr 3, s. 423-428Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The International Convention for the Safety of Life at Sea (SOLAS) recognises five different fire-extinguishing system solutions for ro-ro spaces on ships; manually activated water spray systems (Resolution A.123(V)), automatic sprinkler or deluge water spray systems and automatic nozzle or deluge water mist systems (MSC.1/Circ.1430), high-expansion foam systems and gas fire-extinguishing systems (FSS Code). A review of potential commercially available alternative systems, their expected performance efficiency and water consumption was made. Based on this review, two alternative fire-extinguishing systems were identified: Compressed Air Foam Systems (CAFS) and foam-water sprinkler/spray systems. Fire suppression performance testing of water spray systems according to the Resolution A.123(V) and MSC.1/Circ.1430, a CAFS and a foam-water spray system were conducted. The water spray system per MSC.1/Circ.1430 had superior performance while the system per Resolution A.123(V) and the foam-water spray system limited the fire size to some degrees. The CAFS provided limited fire suppression performance.

  • 4.
    Comanescu, Iulian
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, KIMAB.
    Melchers, Robert E.
    University of Newcastle, Australia.
    Taxén, Claes
    RISE - Research Institutes of Sweden (2017-2019), Material och produktion, KIMAB.
    Corrosion and durability of offshore steel water injection pipelines2015Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 11, nr 4, s. 424-437Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Carbon steel pipelines are widely used for injection of sea and other waters into oil and gas wells so as to increase the rate of recovery, particularly from mature fields. Internal corrosion usually is mild. However, cases of very aggressive channelling corrosion along the bottom of the pipeline have been observed. Practical experience and anecdotal observations have attributed this to microbiologically influenced corrosion even though extensive use is made of preventative measures including biocides, oxygen scavengers, corrosion and scale inhibitors, and pipeline pigging. Interpretation of data and observations for five water injection pipelines, made available by industry, indicate that microbiologically influenced corrosion may play a part in causing channelling corrosion but that the most likely cause is under-deposit corrosion under pipe debris that settles during periods of pipeline shut-downs and low water velocity.

  • 5.
    de Vries, L
    et al.
    Chalmers University of Technology, Sweden.
    Hogström, P.
    Chalmers University of Technology, Sweden.
    Costa, Nicole
    Chalmers University of Technology, Sweden.
    Mallam, S.
    Chalmers University of Technology, Sweden.
    Designing for safe operations: promoting a human-centred approach to complex vessel design2017Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 12, nr 8, s. 1016-1023Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The benefits of a human-centred approach to design have been widely recognised throughout industry, in the research community and by regulatory bodies. In the maritime domain, it is also beginning to make an impact. This article explores how a human-centred approach may successfully be achieved within the context of ship design using a case study from a project to create conceptual designs for two offshore wind turbine installation vessels. Using vessel designs as a mediating tool between designers, users and human factors specialists, basic task analysis and link analysis methods were used to incorporate operational knowledge into the design process. After applying this to the integration of a dynamic positioning system on one of the vessels, the designers concluded that a human-centred approach had improved not only ship safety, but also safety, efficiency and cost-effectiveness in operations.

  • 6.
    Evegren, Franz
    RISE - Research Institutes of Sweden (2017-2019), Säkerhet och transport, Safety.
    Fire risk assessment of alternative ship design2017Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 12, nr 6, s. 837-842Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The procedure to evaluate fire safety of alternative ship design solutions, described in MSC/Circ.1002, has been found insufficient for novel and large scopes. In this paper, it is analysed with regards to function and applicability as a risk-based assessment procedure. Deficiencies are addressed based on risk assessment research and involvement in over a dozen performed assessments. Clarified are inconsistencies in the fire safety regulations, which must be considered particularly during identification of hazards. It is also suggested that affected safety functions are evaluated separately if possible and that the assessment sophistication is adapted to the scope of introduced hazards; four levels to perform parts of or the whole assessment are proposed.

    Fulltekst (pdf)
    fulltext
  • 7.
    Jiang, Lei
    et al.
    RISE Research Institutes of Sweden, Säkerhet och transport, Brand och Säkerhet. Ningbo University, China.
    Olofsson, Anna
    RISE Research Institutes of Sweden, Säkerhet och transport, Brand och Säkerhet.
    Ingason, Haukur
    RISE Research Institutes of Sweden, Säkerhet och transport, Brand och Säkerhet.
    Evegren, Franz
    RISE Research Institutes of Sweden, Säkerhet och transport, Brand och Säkerhet.
    Mindykowski, Pierrick
    RISE Research Institutes of Sweden, Säkerhet och transport, Brand och Säkerhet.
    Effect of opening geometries on fire development in a ro-ro space2023Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, s. 272-284Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A series of model scale experiments were conducted to study the fire development in a ro-ro deck with various opening geometries. The experiments were performed in a 1/8 reduced scale model with a heptane pool fire as fire source. Experimental results show that both the ventilation factor and the opening position affect the fire development. The critical opening ratio for the fire to self-extinguish is 4%, with the opening locating at the bottom of the side walls while no self-extinction is found for other tests. A higher opening position and a larger opening height provide better flow exchange between the deck and the ambient, but this effect is only obvious for 4% opening. Numerical study shows that Fire Dynamic Simulator used with default simple settings underestimates the fire development and yields an early extinction when fire self-extinction occurs. For freely developed fire with large openings, FDS gives more close results to experiments.

    Fulltekst (pdf)
    fulltext
  • 8.
    Johnson, Erland
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Högström, P
    Schreuder, M
    Jansson, E
    Survivability analysis of a struck ship with damage opening - influence from model and material properties uncertainties2011Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 6, nr 4, s. 339-354Artikkel i tidsskrift (Fagfellevurdert)
  • 9.
    Kuznecovs, Artjoms
    et al.
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Mallaya Ullal, Anirudh
    Chalmers University of Technology, Sweden.
    Janardhana Bangera, Pavan
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE Research Institutes of Sweden, Material och produktion, Kemi och Tillämpad mekanik. Chalmers University of Technology, Sweden.
    Consequence analyses of collision-damaged ships — damage stability, structural adequacy and oil spills2023Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 18, nr 4, s. 567-Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A ship collision accident may pose a threat to human lives, the environment and material assets. A damaged ship can suffer from the loss of ship stability, reduced global structural strength, and the loss of the integrity of internal tanks carrying polluting liquids. This study presents a methodology as a framework that can be used to analyze the related consequences of ship-ship collision events using simulations and evaluations. The methodology includes nonlinear finite element analyses of the collision event, a METOCEAN data analysis module, damage stability simulations, analyses of the damaged ship’s ultimate strength and structural integrity, oil spill drift simulations, and finally, an evaluation of the three abovementioned consequences. A case study with a chemical tanker subjected to collision demonstrates the methodology. The collision event was assumed to occur in the Kattegat area (between Sweden and Denmark) at a ship route intersection with high ship traffic density. © 2022 The Author(s).

  • 10.
    Ringsberg, Jonas W.
    et al.
    Chalmers University of Technology, Sweden.
    Li, Zhiyuan
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Kuznecovs, Artjoms
    Chalmers University of Technology, Sweden.
    Shafieisabet, Roozbeh
    Chalmers University of Technology, Sweden.
    Reduction in ultimate strength capacity of corroded ships involved in collision accidents2018Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 13, s. 155-166Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The objective of the study is to investigate the effects of sudden damage, and progressive deterioration due to corrosion, on the ultimate strength of a ship which has been collided by another vessel. Explicit finite element analyses (FEA) of collision scenarios are presented where factors are varied systematically in a parametric study, e.g. the vessels involved in the collision, and consideration of corroded ship structure elements and their material characteristics in the model. The crashworthiness of the struck ships is quantified in terms of the shape and size of the damage opening in the side-shell structure, and the division of energy absorption between the striking and struck ships for the different collision simulations. The ultimate strength of the struck ship is calculated using the Smith method and the shape and size of the damage openings from the FEA. In conclusion, the study contributes to understanding of how corroded, collision-damaged ship structures suffer significantly from a reduction in crashworthiness and ultimate strength, how this should be considered and modelled using the finite element method and analysed further using the Smith method.

  • 11.
    Ringsberg, Jonas
    et al.
    Chalmers University of Technology, Sweden.
    Yang, Shun Han
    Chalmers University of Technology, Sweden.
    Lang, Xiao
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE Research Institutes of Sweden, Material och produktion, Tillämpad mekanik.
    Kamf, Jonas
    W4P Waves4Power AB, Sweden.
    Mooring forces in a floating point-absorbing WEC system–a comparison between full-scale measurements and numerical simulations2021Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 15, nr S1, s. S70-S81Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The study presents an investigation of Waves4Power’s WaveEL 3.0 wave energy converter (WEC). It was used as a reference for full-scale measurements of the mooring forces and buoy motions in a measurement campaign 2017 at an installation location off the coast of Runde in Norway. A numerical simulation model of the installation was developed in the DNV GL software SESAM. Unfortunately, the sea state conditions were not measured during the measurement campaign. Hence, a methodology was developed that used the recorded motion data to compute the sea state conditions at the test site. The simulated WEC motions based on the computed sea states agreed very well with the measured WEC motions. The measured and simulated mooring forces were compared under various environmental conditions. 3-hour sea state realizations are typically preferred in numerical simulations. However, influences from the tide at the test site showed that sea states were normally stationary for only 1–2 h. The measured and simulated average mooring forces agreed very well during 1-hour periods, whereas the simulations overestimated the mooring forces in 3-hour periods because of the tide. © 2020 The Author(s). 

    Fulltekst (pdf)
    fulltext
  • 12.
    Shao, Xinyuan
    et al.
    Chalmers University of Technology, Sweden.
    Yao, Hua-Dong
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas W.
    Chalmers University of Technology, Sweden.
    Li, Zhiyuan
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE Research Institutes of Sweden, Material och produktion, Kemi och Tillämpad mekanik. Chalmers University of Technology, Sweden.
    Performance analysis of two generations of heaving point absorber WECs in farms of hexagon-shaped array layouts2024Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212XArtikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Numerical analyses are presented for two generations of a floating heaving point absorber wave energy converter (WEC) installed with different farm array layouts. The wave farm configurations are based on WECs developed by Waves4Power. The numerical models are developed in the DNV software package, Sesam. Parametric studies of the isolated WEC configurations and farm array layouts are conducted under typical environmental conditions and various incident wave directions to understand the hydrodynamic power performance and the levelised cost of energy (LCoE). Hexagonal layouts are proposed for deploying the WEC units and compared with a 10-unit layout termed StarBuoy, which has been reported in previous work. The results of the present study confirm that the interactions between arrayed units in a farm can have either positive or negative effects on the LCoE, which is dependent on the array layout and environmental conditions. The hexagonal array layouts lead to lower LCoE owing to constructive interaction effects. 

    Fulltekst (pdf)
    fulltext
  • 13.
    Yang, Shun Han
    et al.
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE Research Institutes of Sweden, Material och produktion, Tillämpad mekanik. Chalmers University of Technology, Sweden.
    Hu, Zhiqiang
    Newcastle University, UK.
    Experimental and numerical investigation of a taut-moored wave energy converter: a validation of simulated mooring line forces2021Inngår i: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 15, nr suppl 1Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    A reliable simulation model to calculate the motion and force responses of wave energy converters (WECs) is imperative to ensure the reliability and long-term performance of WEC systems; these aspects are fundamental to achieving full commercialisation of wave energy. A simulation model was developed and validated concerning the simulated WEC buoy motions in a previous study; this study validated the mooring force calculations for the same model. The example WEC system comprises a buoy, a power take-off (PTO) system, and a three-leg mooring system wherein each leg is divided into two taut segments joined by a submerged float. A 1:20 physical model was built and tested in the Deepwater Offshore Basin at Shanghai Jiao Tong University. Numerical models were developed to simulate the coupled hydrodynamic and structural responses of the WEC system, primarily using potential flow theory, the boundary element method, the finite element method, and the Morison equation. The simulated and measured axial force results at the top ends of the six mooring segments were compared; the results agreed best in the lower segments of each mooring leg and in the moorings on the downwind side because of the PTO system uncertainties and the uncalibrated damping in the numerical model. Nonetheless, the numerical model reasonably predicted the moorings’ accumulated fatigue damage, demonstrating that the model can be reliably used for mooring structural analyses. The study also used the validated numerical model to simulate a full-scale WEC system installed in Runde, Norway. A comparison of the results from the full-scale measurements and simulations shows that the numerical simulation model exhibited a good predictive capability for the mooring forces of the full-scale WEC system. © 2020, © 2020 The Author(s).

1 - 13 of 13
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
v. 2.43.0