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  • 1.
    Håkansson, Måns
    et al.
    Saab Kockums, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Cost and weight ofcomposite ship structures: A parametric study based on Det Norske Veritasrules?2017In: IMechE Part M - Journal of Engineering for the Maritime EnvironmentArticle in journal (Refereed)
    Abstract [en]

    A wider use of composites in larger, commercial vessels has been limited by initial costs and fire regulations, but both of these obstacles are diminishing. Increasing fuel costs and more stringent emission requirements have heightened the value of lightweight structures. Due to the higher acquisition costs and other entry barriers, composite designs must be as cost efficient as possible in order to compete with traditional steel or aluminium designs. The purpose of this article is to investigate which fibre-reinforced polymer materials and types of structures are most suitable for different parts of a ship design in order to minimize weight or cost. This is done by designing and comparing individual composite panels while varying a wide range of input parameters and strictly following the ‘Det Norske Veritas (DNV) Rules for Classification of High Speed, Light Craft and Naval Surface Craft’. The results are presented as weight and cost comparisons between materials and structures and also degree of utilization for the different design criteria; carbon fibre structures are on the average 20%–30% lighter than glass fibre structures but are consistently more expensive. The results also indicate that sandwich panels in most cases are lighter than single-skin panels, and that for sandwich structures, the mechanical properties of the core material are commonly the critical design criterion. The minimum amount of reinforcement stipulated by the rules is also found to be a critical factor.

  • 2.
    Johannesson, Pär
    et al.
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Podgórski, Krzysztof
    Lunds University, Sweden.
    Rychlik, Igor
    Chalmers University of Technology, Sweden.
    Laplace distribution models for road topography and roughness2017In: Int. J. Vehicle Performance, Vol. 3, no 3, p. 224-258Article in journal (Refereed)
    Abstract [en]

    Gaussian models are frequently used for road elevations. However, these models are often only valid for short sections of the road. Here we present a comprehensive approach to describe various aspects of road surface/elevation by using extensions of Gaussian models arising from random gamma distributed variances. These random variances result in the Laplace distribution and thus we refer to the so defined models as Laplace models. The approach is shown to perform well in modelling road topography, road roughness and multi-valued responses of forces and bending moments containing transients. The different Laplace models are presented together with numerical examples and Matlab code for simulation.

  • 3.
    Li, Zhiyuan
    et al.
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Performance assessment of the crashworthiness of corroded ship hulls.2017In: Proceedings of the Sixth International Conference on Marine Structures (MARSTRUCT2017), Lisbon, Portugal, May 2017, 2017, p. 523-532Conference paper (Refereed)
  • 4.
    Ringsberg, Jonas
    et al.
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety.
    Zhang, Meng
    KTH Royal Institute of Technology, Sweden.
    Yu, Y
    Chalmers University of Technology, Sweden.
    Shock analysis of a stern ramp using dynamic design analysis method2017In: Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2017), Trondheim, Norway, June 25-30 2017., 2017Conference paper (Refereed)
    Abstract [en]

    Shock load caused by underwater explosion in naval battles can lead to malfunction of the equipment on-board naval vessels. It makes the ships vulnerable and they can lose the ability to accomplish their missions. This study presents a shock analysis, using the dynamic design analysis method (DDAM), of a naval ship stern ramp subjected to a non-contact underwater explosion. The objective is to evaluate the performance of the ramp subjected to a shock load, identify areas for structural improvements and recommend design changes. The DDAM in the commercial software ANSYS is used in the evaluation of the ramp. The structural response to the shock load is estimated by combined modal and response spectrum analyses. The shock load is applied in three directions (vertical, fore and aft, athwart ships) and the results show that the vertical direction is the most severe loading direction and critical to the functionality of the ramp. A parametric study is presented which shows which parameters that influence the most the structural response. The results from this study are used to suggest improvements of the ramp structure to make it more resistant to shock loads.

  • 5.
    Schreuder, Martin
    et al.
    Chalmers.
    Hogström, Per
    Chalmers.
    Ringsberg, Jonas
    Chalmers.
    Janson, Carl-Erik
    Chalmers.
    Johnson, Erland
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Fire Research.
    Experimental verification of finite element failure criteria with respect to strain state and element size2009In: Proceedings of 12th International Conference on Fracture, Ottawa, Canada, 12-17 July 2009., 2009Conference paper (Refereed)
  • 6.
    Yang, Shun-Han
    et al.
    Chalmers University of Technology, Sweden.
    Ringsberg, Jonas
    Chalmers University of Technology, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety. Chalmers University of Technology, Sweden.
    Hu, Zhiquang
    Newcastle University, UK.
    Biofouling on mooring lines and power cables used in wave energy converter systems - analysis of fatigue life and energy performance2017In: Applied Ocean Research, ISSN 0141-1187, E-ISSN 1879-1549, Vol. 65, p. 166-177Article in journal (Refereed)
    Abstract [en]

    This study presents an analysis of a wave energy converter (WEC) system consisting of a buoy, a mooring system, and a power cable connected to a hub. The investigated WEC system is currently under full-scale testing near Runde in Norway. The purpose of the study was to investigate the characteristics of the entire system, primarily with regard to energy performance and the fatigue life of the mooring lines and power cable, considering the effects of marine biofouling and its growth on the system’s components. By means of parametric study, the energy performance and fatigue life of the mooring lines and power cable were investigated considering two mooring configurations, three biofouling conditions, four sea states in a scatter diagram, and three wave and current directions. Hydrodynamic and structural response simulations were conducted in a coupled response analysis using the DNV-GL software SESAM. Energy performance analyses and stress-based rainflow counting fatigue calculations were performed separately using an in-house code. The results show that, for a WEC system which has been deployed for 25 years, biofouling can reduce the total power absorption by up to 10% and decrease the fatigue life of the mooring lines by approximately 20%

  • 7.
    Yang, Shun-Han
    et al.
    Chalmers University of Technology, Gothenburg, Sweden.
    Ringsberg, Jonas W.
    Chalmers University of Technology, Gothenburg, Sweden.
    Johnson, Erland
    RISE - Research Institutes of Sweden, Safety and Transport, Safety. Chalmers University of Technology, Gothenburg, Sweden.
    Parametric study of the dynamic motions and mechanical characteristics of power cables for wave energy converters2017In: Journal of marine science and technologyArticle in journal (Refereed)
    Abstract [en]

    A case study of a point-absorber wave energy converter (WEC) system is presented. The WEC system forms an array, with several WECs located around a central hub to which they are each connected by a short, free-hanging power cable. The objective of the study is to analyse the dynamic characteristics and estimate the fatigue life of the power cable which is not yet in use or available on the commercial market. Hence, a novel approach is adopted in the study considering that the power cable’s length is restricted by several factors (e.g., the clearances between the service vessel and seabed and the cable), and the cable is subject to motion and loading from the WEC and to environmental loads from waves and currents (i.e., dynamic cable). The power cable’s characteristics are assessed using a numerical model subjected to a parametric analysis, in which the environmental parameters and the cable’s design parameters are varied. The results of the numerical simulations are compared and discussed regarding the responses of the power cables, including dynamic motion, curvature, cross-sectional forces, and accumulated fatigue damage. The effects of environmental conditions on the long-term mechanical life spans of the power cables are also investigated. Important cable design parameters that result in a long power cable (fatigue) service life are identified, and the cable service life is predicted. This study contributes a methodology for the first-principle design of WEC cables that enables the prediction of cable fatigue life by considering environmental conditions and variations in cable design parameters.

1 - 7 of 7
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