The Experts below are selected from a list of 2097 Experts worldwide ranked by ideXlab platform

Anders Rosén - One of the best experts on this subject based on the ideXlab platform.

  • On High-Speed Craft acceleration statistics
    Ocean Engineering, 2016
    Co-Authors: Mikael Razola, Katrin Olausson, Karl Garme, Anders Rosén
    Abstract:

    Design and operation of High-Speed planing Craft is ruled by the hydrodynamic impact loads and the related Craft responses occurring at violent wave encounters. Simulation, measurement and characterization of these loads and responses is however far from trivial. Hereby the general knowledge about these processes is actually rather limited and it is common to rely on simple semi-empirical formulas when designing and analyzing High-Speed Craft. This paper presents a unique set of impact acceleration data for a High-Speed Craft in waves, generated based on non-linear strip simulations. Methods and measures for statistical characterization of the acceleration process are established and evaluated, and by application of these methods on the simulation data a number of issues are clarified, for example: slamming time scales and selection of appropriate sampling rates and filtering levels; identification of peak values in acceleration signals; statistical distributions and convergence; and the relation between the statistical peak fraction averages that are commonly used as design parameters and the actual extreme values. The established methods and generated results form a valuable basis for setting up and analyzing High-Speed Craft experiments and simulations, and for validating and updating the prevailing semi-empirical methods.

  • Towards simulation-based structural design of High-Speed Craft
    2016
    Co-Authors: Mikael Razola, Karl Garme, Anders Rosén, Katrin Olausson
    Abstract:

    The methods for structure design of High-Speed Craft available in the class Wcation societies' scantling codes and various standards are well established and easy to use. They are however limited i ...

  • Towards Simulation-Based Design of High-Speed Craft
    2015
    Co-Authors: Mikael Razola, Karl Garme, Anders Rosén, Katrin Olausson
    Abstract:

    The methods for structure design of High-Speed Craft available in the classification societies’ scantling codes and various standards are well established and easy to use. They are however limited ...

  • Rough water performance of lightweight High-Speed Craft:
    Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment, 2014
    Co-Authors: Karl Garme, Anders Rosén, Ivan Stenius, Jakob Kuttenkeuler
    Abstract:

    Previous studies have shown how the use of composite materials and application of sophisticated design methods can give significantly lighter High-Speed Craft structures than what is normally achie ...

  • hydroelastic interaction in panel water impacts of High Speed Craft
    Ocean Engineering, 2011
    Co-Authors: Ivan Stenius, Anders Rosén, Jakob Kuttenkeuler
    Abstract:

    The paper considers the hydroelastic interaction involved in panel-water impacts for High-Speed Craft. Hydroelastic panel-water impacts are simulated by using the finite element code LS-DYNA and a simplified in-house developed method. The mechanisms involved are studied through a systematic series of simulations comprising different impact velocities, deadrise angles, boundary conditions, membrane effects, and panel properties. The terms inertial hydroelastic effects and kinematic hydroelastic effects are introduced to categorize the different mechanisms involved in the hydroelastic problem. It is shown that hydroelastic effects can both increase and reduce the panel responses depending on the impact envelope considered, and it is made clear that the impact envelope has to be carefully considered when establishing the significance of hydroelasticity in a hull-water impact problem. Membrane effects are shown to have large influences on the hydroelastic effects even for moderate panel deflections. The results generated are further used to evaluate and discuss hydroelastic criterion and methods for hydroelastic characterization.

Katrin Olausson - One of the best experts on this subject based on the ideXlab platform.

  • On High-Speed Craft acceleration statistics
    Ocean Engineering, 2016
    Co-Authors: Mikael Razola, Katrin Olausson, Karl Garme, Anders Rosén
    Abstract:

    Design and operation of High-Speed planing Craft is ruled by the hydrodynamic impact loads and the related Craft responses occurring at violent wave encounters. Simulation, measurement and characterization of these loads and responses is however far from trivial. Hereby the general knowledge about these processes is actually rather limited and it is common to rely on simple semi-empirical formulas when designing and analyzing High-Speed Craft. This paper presents a unique set of impact acceleration data for a High-Speed Craft in waves, generated based on non-linear strip simulations. Methods and measures for statistical characterization of the acceleration process are established and evaluated, and by application of these methods on the simulation data a number of issues are clarified, for example: slamming time scales and selection of appropriate sampling rates and filtering levels; identification of peak values in acceleration signals; statistical distributions and convergence; and the relation between the statistical peak fraction averages that are commonly used as design parameters and the actual extreme values. The established methods and generated results form a valuable basis for setting up and analyzing High-Speed Craft experiments and simulations, and for validating and updating the prevailing semi-empirical methods.

  • Towards simulation-based structural design of High-Speed Craft
    2016
    Co-Authors: Mikael Razola, Karl Garme, Anders Rosén, Katrin Olausson
    Abstract:

    The methods for structure design of High-Speed Craft available in the class Wcation societies' scantling codes and various standards are well established and easy to use. They are however limited i ...

  • Towards Simulation-Based Design of High-Speed Craft
    2015
    Co-Authors: Mikael Razola, Karl Garme, Anders Rosén, Katrin Olausson
    Abstract:

    The methods for structure design of High-Speed Craft available in the classification societies’ scantling codes and various standards are well established and easy to use. They are however limited ...

  • On Evaluation and Modelling of Human Exposure to Vibration and Shock on Planing High-Speed Craft
    2015
    Co-Authors: Katrin Olausson
    Abstract:

    High Speed in waves, necessary in for instance rescue or military operations, often result in severe loading on both the Craft and the crew. To maximize the performance of the High-Speed Craft (HSC ...

  • Prediction and evaluation of working conditions on High-Speed Craft using suspension seat modelling
    Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment, 2014
    Co-Authors: Katrin Olausson, Karl Garme
    Abstract:

    Severe working conditions on board High-Speed Craft adversely affect not only the safety, health and performance of the crew but also the performance of the vessel as a technical system. Human fact ...

Matteo Bonci - One of the best experts on this subject based on the ideXlab platform.

  • The Roll Damping of High-Speed Craft in Waves
    Progress in Marine Science and Technology, 2020
    Co-Authors: Oliviero Consolo, Lodewick Hillege, Matteo Bonci
    Abstract:

    The main component of High-Speed Craft (HSC) roll damping is related to the hydrodynamic lift developed on the hull surface. This is very different from displacement type hull forms. However, the estimation of roll damping of HSC is often treated in the same manner as for larger and slower ships. Being able to model the roll of HSC correctly is of paramount importance in the prediction of the lateral component of acceleration of an impact at a roll angle in waves, or during a manoeuvre at High Speed. These are phenomena that can have severe consequences on the comfort and safety of the crew on-board of HSC. Three procedures meant to estimate the HSC roll damping were analyzed. The outcomes of these procedures were compared in terms of roll and lateral accelerations statistics of HSC sailing in irregular waves. The HSC motions were predicted by a 2D+t mathematical model. Differently from the majority of the state-of-art HSC seakeeping tools, which focuses only on the vertical impacts in head waves, in this work the roll was included in the simulations. The numerical results of the simulations were validated by means of free sailing model tests at beam and quartering irregular seas carried out at the Seakeeping and Manoeuvring Basin of MARIN.

  • The heel-induced sway force and yaw moment of a High-Speed Craft in following regular waves
    Journal of Marine Science and Technology, 2020
    Co-Authors: Matteo Bonci, Pepijn Jong, Frans Walree, Martin Renilson, Jan Alexander Keuning, Riaan Van’t Veer
    Abstract:

    The coupling between heel and the loads in the horizontal plane is usually neglected in manoeuvrability studies. However, the heel–sway and heel–yaw coupling can play an important role in potentially unsafe conditions, such as in a following sea. In these conditions, small fast vessels experience dynamic instabilities which threaten their ability to maintain a straight course. In this study, the coupling between the static heel and the sway force and yaw moment was investigated for a High-Speed Craft. The objective of this work is to understand the effect of heel on the manoeuvring in following waves, and to predict this effect by means of numerical tools for different combinations of wave characteristics and vessel Speeds. A dedicated captive model test campaign was conducted to evaluate the manoeuvring loads in sway and yaw when the Craft has a heel angle in following regular waves. The tests were performed in the towing tank of Delft University of Technology. The heel-induced loads depend strongly on the longitudinal position of the vessel in the wave, and they significantly differ from the heel-induced loads in calm water at the respective Speed. The data carried out in the model tests were used to describe empirically the heel-induced loads for several combinations of ship Speeds and wave characteristics. This empirical description was meant to correct a 3D potential flow boundary element method (BEM), with the objective of being able to predict these loads on a wide range of conditions. The corrected 3D BEM was used to simulate the behaviour of the High-Speed Craft in following regular waves. This analysis showed that the heel-induced loads have the effect of stabilizing the ship to the inception of dynamic instabilities in the following sea.

Karl Garme - One of the best experts on this subject based on the ideXlab platform.

  • On High-Speed Craft acceleration statistics
    Ocean Engineering, 2016
    Co-Authors: Mikael Razola, Katrin Olausson, Karl Garme, Anders Rosén
    Abstract:

    Design and operation of High-Speed planing Craft is ruled by the hydrodynamic impact loads and the related Craft responses occurring at violent wave encounters. Simulation, measurement and characterization of these loads and responses is however far from trivial. Hereby the general knowledge about these processes is actually rather limited and it is common to rely on simple semi-empirical formulas when designing and analyzing High-Speed Craft. This paper presents a unique set of impact acceleration data for a High-Speed Craft in waves, generated based on non-linear strip simulations. Methods and measures for statistical characterization of the acceleration process are established and evaluated, and by application of these methods on the simulation data a number of issues are clarified, for example: slamming time scales and selection of appropriate sampling rates and filtering levels; identification of peak values in acceleration signals; statistical distributions and convergence; and the relation between the statistical peak fraction averages that are commonly used as design parameters and the actual extreme values. The established methods and generated results form a valuable basis for setting up and analyzing High-Speed Craft experiments and simulations, and for validating and updating the prevailing semi-empirical methods.

  • Towards simulation-based structural design of High-Speed Craft
    2016
    Co-Authors: Mikael Razola, Karl Garme, Anders Rosén, Katrin Olausson
    Abstract:

    The methods for structure design of High-Speed Craft available in the class Wcation societies' scantling codes and various standards are well established and easy to use. They are however limited i ...

  • Towards Simulation-Based Design of High-Speed Craft
    2015
    Co-Authors: Mikael Razola, Karl Garme, Anders Rosén, Katrin Olausson
    Abstract:

    The methods for structure design of High-Speed Craft available in the classification societies’ scantling codes and various standards are well established and easy to use. They are however limited ...

  • Rough water performance of lightweight High-Speed Craft:
    Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment, 2014
    Co-Authors: Karl Garme, Anders Rosén, Ivan Stenius, Jakob Kuttenkeuler
    Abstract:

    Previous studies have shown how the use of composite materials and application of sophisticated design methods can give significantly lighter High-Speed Craft structures than what is normally achie ...

  • Prediction and evaluation of working conditions on High-Speed Craft using suspension seat modelling
    Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment, 2014
    Co-Authors: Katrin Olausson, Karl Garme
    Abstract:

    Severe working conditions on board High-Speed Craft adversely affect not only the safety, health and performance of the crew but also the performance of the vessel as a technical system. Human fact ...

Mikael Razola - One of the best experts on this subject based on the ideXlab platform.

  • On High-Speed Craft acceleration statistics
    Ocean Engineering, 2016
    Co-Authors: Mikael Razola, Katrin Olausson, Karl Garme, Anders Rosén
    Abstract:

    Design and operation of High-Speed planing Craft is ruled by the hydrodynamic impact loads and the related Craft responses occurring at violent wave encounters. Simulation, measurement and characterization of these loads and responses is however far from trivial. Hereby the general knowledge about these processes is actually rather limited and it is common to rely on simple semi-empirical formulas when designing and analyzing High-Speed Craft. This paper presents a unique set of impact acceleration data for a High-Speed Craft in waves, generated based on non-linear strip simulations. Methods and measures for statistical characterization of the acceleration process are established and evaluated, and by application of these methods on the simulation data a number of issues are clarified, for example: slamming time scales and selection of appropriate sampling rates and filtering levels; identification of peak values in acceleration signals; statistical distributions and convergence; and the relation between the statistical peak fraction averages that are commonly used as design parameters and the actual extreme values. The established methods and generated results form a valuable basis for setting up and analyzing High-Speed Craft experiments and simulations, and for validating and updating the prevailing semi-empirical methods.

  • Towards simulation-based structural design of High-Speed Craft
    2016
    Co-Authors: Mikael Razola, Karl Garme, Anders Rosén, Katrin Olausson
    Abstract:

    The methods for structure design of High-Speed Craft available in the class Wcation societies' scantling codes and various standards are well established and easy to use. They are however limited i ...

  • New Perspectives on Analysis and Design of High-Speed Craft with Respect to Slamming
    2016
    Co-Authors: Mikael Razola
    Abstract:

    High-Speed Craft are in High demand in the maritime industry, for example, in maintenance operations for offshore structures, for search and rescue, for patrolling operations, or as leisure Craft t ...

  • Towards Simulation-Based Design of High-Speed Craft
    2015
    Co-Authors: Mikael Razola, Karl Garme, Anders Rosén, Katrin Olausson
    Abstract:

    The methods for structure design of High-Speed Craft available in the classification societies’ scantling codes and various standards are well established and easy to use. They are however limited ...

  • On Structural Design of High-Speed Craft
    2013
    Co-Authors: Mikael Razola
    Abstract:

    The development in structural design and construction of High-Speed Craft has been extensive during the last decades. Environmental and economical issues have increased the need to develop more opt ...