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  • 1.
    Al-Khalili Szigyarto, Cristina
    et al.
    KTH, Skolan för bioteknologi (BIO), Proteomik.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Högfeldt, Anna-Karin
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), Lärande.
    Magnell, Marie
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), Lärande.
    Vägen från student till ingenjör: exempel från två kandidatexamenskurser och ett förslag om en programsammanhållande byggnadsställning2011Konferensbidrag (Övrigt vetenskapligt)
  • 2.
    Burman, Magnus
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Stenius, Ivan
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Rosen, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Comparative Life Cycle Assessment of the hull of a high-speed craft2016Ingår i: Journal of Engineering for the Maritime Environment (Part M), ISSN 1475-0902, E-ISSN 2041-3084, Vol. 230, nr 2, s. 378-387Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A comparative Life Cycle Assessment is performed for different structural material concepts on a 24-m-long high-speed patrol craft. The study is comparative and determines the differences in and sensitivities to environmental impact, especially in relation to the total impact of fuel burn for the different material concepts. The material concepts are aluminium and various composite combinations consisting of glass fibre and carbon fibre with vinyl ester resin both as single skins and as sandwich with a Divinycell foam core. Commercially available standard Life Cycle Assessment software is used for the Life Cycle Assessment calculations. The study shows that regardless of hull material concept, the environmental impact is dominated by the operational phase due to relatively large fuel consumption. In the operational phase, the lightest carbon-fibre concept is shown to have least environmental impact. Considering the manufacturing phase exclusively for the different hull concepts, it is concluded that the manufacturing of the aluminium hull has a somewhat larger environment impact for the majority of Life Cycle Assessment impact categories in comparison to the different composite hulls. The significant impact on the marine and the fresh water aquatic ecotoxicity originates from the aluminium raw material excavation and manufacturing processes. It is shown that the lightest hull, the carbon-fibre sandwich concept, with a 50% structural weight reduction compared to the aluminium design, can be utilized to reduce the fuel consumption by 20% (775 ton of diesel) over the lifetime with significant impact on the dominating environmental aspects considered herein, abiotic depletion, global warming and acidification.

  • 3.
    Cheemakurthy, Harsha
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Zhang, Meng
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Burman, Magnus
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.
    Ehlers, S.
    Germany.
    Franz Von Bock, R. U.
    Germany.
    Polach, x
    Germany.
    Statistical estimation of uncertainties associated with ship operations in fresh water ice2018Ingår i: Proceedings of the International Offshore and Polar Engineering Conference, International Society of Offshore and Polar Engineers , 2018, s. 1608-1615Konferensbidrag (Refereegranskat)
    Abstract [en]

    Operational Time Window (OTW) and its confidence level are important for vessels operating in ice covered waters. This can be evaluated by quantifying all contributing factors in terms of their influence along with respective associated uncertainties. For a case study involving a barge operating in Lake Mälaren, Sweden, five criteria are evaluated, and associated uncertainties are quantified using Variation Mode and Effect Analysis (VMEA) to give individual contribution towards overall uncertainty. Ship resistance due to ice and ice loads dominated over other criteria with highest contributions to uncertainty at 28% and 72% respectively.

  • 4.
    de Alwis, Manudul Pahansen
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Lo Martire, Riccardo
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. Karolinska Institutet, Sweden.
    Ang, Bjorn O.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Development and validation of a web-based questionnaire for surveying the health and working conditions of high-performance marine craft populations2016Ingår i: BMJ Open, ISSN 2044-6055, E-ISSN 2044-6055, Vol. 6, nr 6, artikel-id e011681Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background High-performance marine craft crews are susceptible to various adverse health conditions caused by multiple interactive factors. However, there are limited epidemiological data available for assessment of working conditions at sea. Although questionnaire surveys are widely used for identifying exposures, outcomes and associated risks with high accuracy levels, until now, no validated epidemiological tool exists for surveying occupational health and performance in these populations. Aim To develop and validate a web-based questionnaire for epidemiological assessment of occupational and individual risk exposure pertinent to the musculoskeletal health conditions and performance in high-performance marine craft populations. Method A questionnaire for investigating the association between work-related exposure, performance and health was initially developed by a consensus panel under four subdomains, viz. demography, lifestyle, work exposure and health and systematically validated by expert raters for content relevance and simplicity in three consecutive stages, each iteratively followed by a consensus panel revision. The item content validity index (I-CVI) was determined as the proportion of experts giving a rating of 3 or 4. The scale content validity index (S-CVI/Ave) was computed by averaging the I-CVIs for the assessment of the questionnaire as a tool. Finally, the questionnaire was pilot tested. Results The S-CVI/Ave increased from 0.89 to 0.96 for relevance and from 0.76 to 0.94 for simplicity, resulting in 36 items in the final questionnaire. The pilot test confirmed the feasibility of the questionnaire. Conclusions The present study shows that the web-based questionnaire fulfils previously published validity acceptance criteria and is therefore considered valid and feasible for the empirical surveying of epidemiological aspects among high-performance marine craft crews and similar populations.

  • 5.
    de Alwis, Pahansen
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Monitoring and characterization of vibration and shock conditions aboard high-performance marine craftManuskript (preprint) (Övrigt vetenskapligt)
  • 6.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Improved Time-Domain Simulation of Planing Hulls in Waves by Correction of the Near-Transom Lift2005Ingår i: International Shipbuilding Progress, ISSN 0020-868X, E-ISSN 1566-2829, Vol. 52, nr 3, s. 201-230Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Time-domain simulation, based on 2-dimensional high-frequency added mass formulation of the sectional forces, is a computationally attractive approach to the non-linear behaviour of the planing craft in waves. Nevertheless, the 2-dimensional strip approach, demands for corrections of the lift distribution in order to correctly model the running attitude which is significant for the loads and motions for planing craft in waves. This has traditionally been made by a reduction of the hydrostatic lift and moment with reference to the geometrical fact that the transom stern is dry. This action improves the simulation of the running attitude in calm water but not necessarily of the dynamic behaviour in waves. The paper proposes a correction operating on both the hydrostatic and the hydrodynamic terms of the load distribution. A reduction function is chosen on the basis of model test measurements of the near-transom pressure, and on published model data on running attitude. The approach is satisfactory validated in calm water, regular and irregular waves. Simulations of model experiments and comparison with measurement time series are presented. The correction improves the simulation in both calm water and in waves for a wider speed range compared to a correction limited to the hydrostatic terms.

  • 7.
    Garme, Karl
    KTH, Tidigare Institutioner, Farkost- och flygteknik.
    Modeling of planing craft in waves2004Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Simulation of the planing hull in waves has been addressed during the last 25 years and basically been approached by strip methods. This work follows that tradition and describes a time-domain strip model for simulation of the planing hull in waves. The actual fluid mechanical problem is simplified through the strip approach. The load distribution acting on the hull is approximated by determining the section load at a number of hull sections, strips. The section-wise 2-dimensional calculations are expressed in terms of added mass coefficients and used in the formulations of both inertia and excitation forces in the equations of motions. The modeling approach starts from the hypothetic assumption that the transient conditions can be modeled based on those section-wise calculations. The equation of motion is solved in the time-domain. The equation is up-dated at each time step and every iteration step with respect to the momentary distribution of section draught and relative incident velocity between the hull and water and catches the characteristic non-linear behavior of the planing craft in waves.

    The model follows the principles of the pioneering work of E. E. Zarnick differing on model structure and in details such as the modeling of the lift in the transom area. A major part of the work is concerned with experiments and evaluation of simulations with respect to performed model tests and to published experiment data. Simulations of model tests have been performed and comparisons have been made between measured and simulated time series. The link between simulation and experiment is a wave model which is based on a wave height measurement signal. It is developed and evaluated in the thesis.

    The conclusions are in favor of the 2-dimensional approach to modeling the conditions for the planing hull in waves and among further studies is evaluation of simulated loads and motions to full-scale trial measurement data.

  • 8.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Time-Domain Simulations and Measurements of Loads and Motions of Planning High-Speed Craft in Waves2001Ingår i: 8th International Symposium on Practical Design of Ships, 2001Konferensbidrag (Övrigt vetenskapligt)
  • 9.
    Garme, Karl
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Burström, L.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Measures of vibration exposure for a high-speed craft crew2011Ingår i: Journal of Engineering for the Maritime Environment (Part M), ISSN 1475-0902, E-ISSN 2041-3084, Vol. 225, nr M4, s. 338-349Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The paper compares measurement-based measures for human vibration exposure. Data were collected during sea trials on a 10 m, 50 kn coastguard craft equipped with a three-axial accelerometer at the coxswain seat and with vertically mounted gauges measuring the acceleration of the cockpit floor. The ISO 2631-1:1997 measures of vibration (namely the root-mean-square (r.m.s.) value of the whole-body vibration (determined from the frequency-weighted acceleration signal), the maximum transient vibration value (MTVV), and the vibration dose value), the ISO 2631-5:2004 measure (namely the daily equivalent static compression dose Sed), and also statistically based measures to evaluate the acceleration magnitude are compared and discussed with respect to their ability to identify the mitigating effect of the suspension seat and how the different measures rank the severity of the high-speed craft (HSC) ride. The paper concludes that the r.m.s. value and the MTVV are unsuitable for evaluation of the conditions aboard while the other investigated measures show potential in this respect. Further the approach of ISO 2631-5:2004 taking both the short-term and the long-term perspectives on the human exposure to vibration is concluded to be the most mature method well suited to evaluation of HSC conditions.

  • 10.
    Garme, Karl
    et al.
    KTH, Tidigare Institutioner, Farkost- och flygteknik.
    Hua, Jianbo
    KTH, Tidigare Institutioner, Farkost- och flygteknik.
    A method to analyse seakeeping model measurements in time domain1999Ingår i: Proceedings of the 1999 Ninth International Offshore and Polar Engineering Conference (Volume 3), 1999, s. 629-634Konferensbidrag (Refereegranskat)
    Abstract [en]

    The paper introduces a method to determine a wave equation from a measured wave system. The method is applied to wave measurements recorded in a seakeeping experiment. The obtained wave equations accurately repeat the wave gauge signals. The wave equation provides a link between a numerical and physical model test. This is verified for heave and pitch motions of the ship model in regular and irregular waves. Time domain simulation with the wave equation and initial conditions from the model test, gives motion time series in good agreement with the measurements.

  • 11.
    Garme, Karl
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Simulations and Full-Scale Trials for a HSC Linked by Wave-Height Measurements2005Ingår i: 8th International Conference on Fast Sea Transportation, 2005Konferensbidrag (Övrigt vetenskapligt)
  • 12.
    Garme, Karl
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Direct Calculations in the Design of HSC2001Ingår i: Proceedings 6th International Conference on Fast Sea Transportation, 2001Konferensbidrag (Övrigt vetenskapligt)
  • 13.
    Garme, Karl
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Experimental Pressure Investigation on a High-Speed Craft in Waves2000Ingår i: Proceedings International Conference on Hydrodynamics of High-Speed Craft, 2000Konferensbidrag (Övrigt vetenskapligt)
  • 14.
    Garme, Karl
    et al.
    KTH, Tidigare Institutioner, Farkost- och flygteknik.
    Rosén, Anders
    KTH, Tidigare Institutioner, Farkost- och flygteknik.
    Time-domain simulations and full-scale trials on planing craft in waves2003Ingår i: International Shipbuilding Progress, ISSN 0020-868X, E-ISSN 1566-2829, Vol. 50, nr 3, s. 177-208Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A time-domain simulation model for prediction of global response of planing craft in waves is presented. The simulation model is based on 2-dimensional potential theory, and by updating the hydrodynamic coefficients at each time step, taking the momentary section draught into account, the solution is non-linear. For evaluation captive model tests and full-scale trials that have been performed. Characteristic results from the full-scale trials are reviewed and discussed. The simulations are also validated with published model experiments. The agreement between simulations and experiments is generally good except for discrepancies in pitch moment and motion. The 2-dimensional approach is attractive from a computational cost point of view and it is believed that an adequate simulation model could be developed from the presented model by better modelling of the pressure at transom.

  • 15.
    Garme, Karl
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    In Detail Investigation of Planing Pressure2010Ingår i: Proceedings of the HYDRALAB III Joint User Meeting, 2010Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    The paper describes an experimental study with the major aim to get a detailed picture of thepressure distribution carrying a planning craft at high speed through calm water and waves.The instrumentation, load cases and performed runs are discussed as well as the steps to usethe measurement data for evaluation of numerical models for planing craft in waves.

  • 16.
    Garme, Karl
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Stenius, Ivan
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    In Detail Investigation of Planing Pressure2011Rapport (Övrigt vetenskapligt)
  • 17.
    Garme, Karl
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Stenius, Ivan
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rough water performance of lightweight high-speed craft2014Ingår i: Journal of Engineering for the Maritime Environment (Part M), ISSN 1475-0902, E-ISSN 2041-3084, Vol. 228, nr 3, s. 293-301Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    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 achieved for traditional aluminium designs. A reduction in structural mass and a corresponding reduction in displacement improve the craft calm water performance but can be unfavourable regarding the rough water performance. Here, the rough water performance of two versions of a fast patrol vessel, one in aluminium and the other in carbon fibre sandwich, is studied with simplified semi-empirical methods and more advanced non-linear time domain simulations. In speeds up to 30 knots, the rough water performance of the two craft versions is found to be practically equal. At higher speeds, the lighter composite craft experiences higher vertical accelerations than the heavier aluminium craft, which implies less operational availability. Using trim ballast tanks, the rough water performance of the lighter craft is improved, and it is shown that the acceleration levels can be reduced and even lowered relative to the heavier aluminium craft. This means that the calm water advantages of a lighter composite vessel can be utilized with the same ride comfort and operational availability as for a heavier aluminium vessel.

  • 18.
    Jenkins, Amelia
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Calculation of wave inputs required when predicting shoreline erosion caused by vessels operating in inland waterways2018Ingår i: Proceedings of the International Offshore and Polar Engineering Conference, International Society of Offshore and Polar Engineers , 2018, s. 1272-1280Konferensbidrag (Refereegranskat)
    Abstract [en]

    This paper is part of a research project titled Modelling wash -assessing fuel consumption and erosivity, which is financed by Trafikverket, Swedish Transport Administration. The project aims at developing a computational model to calculate the shoreline erosion caused by ships travelling in inland waterways. This paper covers a field study into possible linear methods which could be implemented to find the wave inputs required to predict shoreline erosion. Thin-ship theory was decided upon and implemented to calculate wave resistance and elevation. Results show the thin-ship model to be accurate for all tested ships between Froude numbers of 0.35-0.7. However, the model does under predict the wave resistance at Froude numbers below 0.35 for vessels with a transom stern.

  • 19.
    Martire, Riccardo Lo
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. Division of Physiotherapy, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Huddinge, Sweden.
    De Alwis, Pahansen
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Äng, B.O.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Construction of a web-based questionnaire for longitudinal investigation of work exposure, musculoskeletal pain and performance impairments in high-performance marine craft populations2017Ingår i: BMJ Open, ISSN 2044-6055, E-ISSN 2044-6055, Vol. 7, nr 7, artikel-id e016006Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Objective High-performance marine craft personnel (HPMCP) are regularly exposed to vibration and repeated shock (VRS) levels exceeding maximum limitations stated by international legislation. Whereas such exposure reportedly is detrimental to health and performance, the epidemiological data necessary to link these adverse effects causally to VRS are not available in the scientific literature, and no suitable tools for acquiring such data exist. This study therefore constructed a questionnaire for longitudinal investigations in HPMCP. Methods A consensus panel defined content domains, identified relevant items and outlined a questionnaire. The relevance and simplicity of the questionnaire's content were then systematically assessed by expert raters in three consecutive stages, each followed by revisions. An item-level content validity index (I-CVI) was computed as the proportion of experts rating an item as relevant and simple, and a scale-level content validity index (S-CVI/Ave) as the average I-CVI across items. The thresholds for acceptable content validity were 0.78 and 0.90, respectively. Finally, a dynamic web version of the questionnaire was constructed and pilot tested over a 1-month period during a marine exercise in a study population sample of eight subjects, while accelerometers simultaneously quantified VRS exposure. Results Content domains were defined as work exposure, musculoskeletal pain and human performance, and items were selected to reflect these constructs. Ratings from nine experts yielded S-CVI/Ave of 0.97 and 1.00 for relevance and simplicity, respectively, and the pilot test suggested that responses were sensitive to change in acceleration and that the questionnaire, following some adjustments, was feasible for its intended purpose. Conclusions A dynamic web-based questionnaire for longitudinal survey of key variables in HPMCP was constructed. Expert ratings supported that the questionnaire content is relevant, simple and sufficiently comprehensive, and the pilot test suggested that the questionnaire is feasible for longitudinal measurements in the study population.

  • 20.
    Olausson, Katrin
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Prediction and evaluation of working conditions on high-speed craft using suspension seat modelling2014Ingår i: Journal of Engineering for the Maritime Environment (Part M), ISSN 1475-0902, E-ISSN 2041-3084, Vol. 229, nr 3, s. 281-290Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    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 factors–based ship design combined with appropriate vibration mitigation techniques and work routines for the crew can improve the working conditions and reduce the risks for performance degradation and adverse health effects. To enable development and use of such means, methods for prediction and evaluation of working conditions are needed for both existing high-speed craft and craft under design. This article presents a 2-degree-of-freedom seat model compatible with both measured and simulated input data. The interaction between seat and human is treated using the concept of apparent mass. The model is validated against experiment data collected on board a 10-m, 50-knot high-speed craft equipped with high-standard suspension seats. Evaluation measures defined in ISO 2631-1 and ISO 2631-5 are used to compare experiment data to modelled data. The seat model slightly overestimates the experiment S ed dose by a mean of 6.5% and underestimates the experiment vibration dose value (8 h) by 4.0%. It is concluded that model data correlate well with experiment data.

  • 21.
    Olausson, Katrin
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Simulation-based assessment of HSC crew exposure to vibration and shock2013Ingår i: FAST 2013 - 12th International Conference on Fast Sea Transportation, FAST 2013 Secretariat , 2013Konferensbidrag (Refereegranskat)
    Abstract [en]

    A simulation-based method for assessment of HSC crew vibration and shock exposure is presented. The simulation scheme includes three modules: Craft response module, Seat response module and Human exposure evaluation module. The first module computes the craft acceleration in the time-domain by a non-linear strip method and delivers input to the second module, where a crew seat model determines the human acceleration exposure time history. The crew's acceleration exposure is assessed in the third module, which includes a strategy to describe the operational profile. The human vibration exposure is evaluated using international standards (ISO 2631-1, ISO 2631-5). In addition, statistical extreme value analyses are used to evaluate the human exposure to shock. The potential to reduce the vibration and shock level is discussed and exemplified using the simulation-based evaluation method to analyse how different seat designs and running attitudes influence the crew vibration exposure.

  • 22.
    Razola, Mikael
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Olausson, Katrin
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    On high-speed craft acceleration statistics2016Ingår i: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 114, s. 115-133Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    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.

  • 23.
    Razola, Mikael
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Olausson, Katrin
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    On High-Speed Craft Acceleration StatisticsManuskript (preprint) (Övrigt vetenskapligt)
  • 24.
    Razola, Mikael
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Allen & Jones RevisitedManuskript (preprint) (Övrigt vetenskapligt)
  • 25.
    Razola, Mikael
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Allen and Jones revisited2014Ingår i: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 89, s. 119-133Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper the prevailing semi-empirical design method, used to predict design slamming pressures for high-speed craft and which is implemented in the scantling rules of the classification societies, is reconstructed and evaluated using numerical and experimental methodologies. It is shown that the present formulations are relevant in terms of the predicted pressures, but that there is room for improvements, particularly in relationship to modern high-speed craft structures. The design method is therefore modified in relationship to these observations using the numerical methodology, and it is concluded that these modifications result in significant improvements regarding the predicted design pressures. Finally a discussion on the analysis methodology; the formulation of lifetime design loads; and the structural loads developed due to the simplified design pressure model is presented.

  • 26.
    Razola, Mikael
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Experimental Evaluation of Slamming Pressure Models Used in Structural Design of High-Speed Craft2014Ingår i: International Shipbuilding Progress, ISSN 0020-868X, E-ISSN 1566-2829, Vol. 61, nr 1-2, s. 17-39Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper a methodology that enables detailed studies of the momentary slamming pressure distribution and the related structural loads is presented. The methodology involves pressure measurements, spatial and temporal pressure distribution reconstruction, and finite element analysis. Using a set of model experiments with a high-speed planing craft towed in irregular waves, the methodology is applied to evaluate different slamming pressure models regarding their ability to accurately represent the structure loads. The slamming equivalent uniform pressure model used in the prevailing semi-empirical design methods, and non-uniform time-dependent pressure models used in a method for direct calculation, are considered. It is concluded that for smaller structure members, typically found in densely spaced metal structures, the uniform pressure model performs well with respect to accurately representing the structure loads. However, for larger members found in modern sandwich structures, the underestimation of structure loads is significant, especially with respect to the shear forces. The non-uniform pressure modeling technique is concluded to be promising regarding its ability to accurately represent the structure loads, regardless of structure member size. The presented methodology is concluded to be a useful tool in further research regarding the evaluation and development of methods for high-speed craft structural design.

  • 27.
    Razola, Mikael
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Olausson, Katrin
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Towards Simulation-Based Design of High-Speed Craft2014Ingår i: 4th Chesapeake Powerboat Symposium, 2014Konferensbidrag (Övrigt vetenskapligt)
    Abstract [en]

    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 in a number of aspects, for example regarding the consideration of the actual operational profile of the craft and the crew working conditions and safety. The drastic simplification of the slamming loads and the related uncertainties inherited in the semi-empirical background further limits the options for structure optimization. The alternative would be the establishment of direct calculation methods. The involved fluid-structure and craft-crew interactions, and the generally complex operation of high-speed craft, however imply great challenges. This paper reviews methods for time-domain simulation of craft motions, structure responses and crew environment for high-speed craft in irregular waves that are currently under development. An approach for using these methods for calculating extreme responses and analyzing crew and structure capacities with detailed consideration of the craft intended operation is outlined and the way forward for establishing a simulation based design approach is discussed.

  • 28.
    Razola, Mikael
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Olausson, Katrin
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Towards simulation-based structural design of high-speed craft2014Ingår i: Transactions - Society of Naval Architects and Marine Engineers, ISSN 0081-1661, Vol. 122, s. 479-492Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    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 in a number of aspects, for example regarding the consideration of the actual operational profile of the craft and the crew working conditions and safety. The drastic simplf1cation of the slamming loads and the related uncertainties inherited in the semi-empirical background further limits the options for structure optimization. The alternative would be the establishment of direct calculation methods. The involved fluid-structure and craft-crew interactions, and the generally complex operation of high-speed craft, however imply great challenges. This paper reviews methods for time-domain simulation of craft motions, structure responses and crew environment for high-speed craft in irregular waves that are currently under development. An approach for using these methods for calculating extreme responses and analyzing crew and structure capacities with detailed consideration of the craft intended operation is outlined and the way forward for establishing a simulation based design approach is discussed.

  • 29.
    Razola, Mikael
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Rosén, Anders
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Stenius, Ivan
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Antonatos, Alexandros
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    On Structural Design of High-Speed Planing Craft with Respect to Slamming2012Ingår i: 8th International Conference on High-Speed Marine Vehicles, 2012Konferensbidrag (Övrigt vetenskapligt)
  • 30.
    Rosén, Anders
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Delin, Petter
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Palmquist, Mikael
    Seaware AB.
    Sample Calculations on the Level 2 Vulnerability Criteria for Parametric Roll2010Rapport (Övrigt vetenskapligt)
  • 31.
    Rosén, Anders
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Edström, Kristina
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), Lärande.
    Borglund, Dan
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Flygdynamik.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Hallström, Stefan
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    3+2≠5 eller Programmål för ingenjörsutbildningar i ljuset av Bolognareformen2011Ingår i: 3:e Utvecklingskonferensen för Sveriges ingenjörsutbildningar, 2011Konferensbidrag (Refereegranskat)
  • 32.
    Rosén, Anders
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Edström, Kristina
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), Lärande.
    Borglund, Dan
    KTH, Skolan för teknikvetenskaplig kommunikation och lärande (ECE), Lärande, Organisation och ledarskap.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Hallström, Stefan
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Programmål inom den nya utbildningsstrukturen på KTH2010Rapport (Övrigt vetenskapligt)
  • 33.
    Rosén, Anders
    et al.
    KTH, Tidigare Institutioner, Farkost- och flygteknik.
    Garme, Karl
    KTH, Tidigare Institutioner, Farkost- och flygteknik.
    Model Experiment Addressing the Impact Pressure Distribution on Planing Craft in Waves2004Ingår i: International Journal of Small Craft Technology, ISSN 1740-0694, Vol. 146Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The aim of the experiment was time-domain monitoring and analysis of the pressure distribution on planing craft inwaves. A model was instrumented with pressure transducers and towed in calm water, head and oblique regular andirregular waves. The transducers were concentrated to a fore matrix to capture the impact loads and an aft matrix tofollow the pressure in the transom area. In waves, the propagation of the pressure enabled a reconstruction of the impactpressure distribution time history from the transducer signals. The impact loads determined as the integratedreconstructed pressure were compared with inertia forces determined from accelerometer signals. Correlation was clearand verified the reconstruction method and the instrumentation in terms of transducer matrix position, size and density.Besides pressure and accelerations, rigid body motions, speed, wave height and resistance were measured. The paper describes the set-up, discusses difficulties concerning model hull rigidity, sampling frequencies and signal analysis, and shows on characteristic results. The paper concludes that detailed time-domain studies of the impact pressure distribution are accessible from the set-up and the suggested analysis methods.

  • 34.
    Rosén, Anders
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Kuttenkeuler, Jakob
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Full-Scale Design Evaluation of the Visby Class Corvette2007Ingår i: 9th International Conference on Fast Sea Transportation, FAST'07, 2007Konferensbidrag (Övrigt vetenskapligt)
  • 35.
    Stenius, Ivan
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Hall Kihl, Susanna
    Vattenbussen AB.
    Burman, Magnus
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Lättkonstruktioner.
    Waterway 365: System Analysis of Challenges in Increased Urban Mobility by Utilization of the Water Ways2014Rapport (Övrig (populärvetenskap, debatt, mm))
    Abstract [en]

    Effective transport solutions for goods and people are crucial for the economic development of a region or city. In major cities worldwide there is a lack of capacity in the road and rail network resulting in high costs, only in Stockholm the cost of the overall shortcomings of commuting has been estimated to 6.3 billion SEK annually. The current trend is further increased congestions in major existing commut- ing routes (roads, rail networks and metro networks).

    In coastal cities like Stockholm, Gothenburg or Copenhagen however, there are inland waterways that would enable shorter and faster commuting routes if efficient land-sea based transportation systems are implemented. In addition the waterway constitutes an opportunity to create new city space, add transport capacity, offer new communication paths, change the transport flow and level off the pres- sure on the present transport system.

    The waterways and parts of the road network are existing infrastructure resources that may be used to contribute to more sustainable travel patterns, reduce congestion on main commuting corridors, in- crease capacity and the traffic system's resilience through new travel relationships, travel patterns and synergies with bicycle and city logistics.

    The aim of this work is to identify the most relevant research topics and key performance parameters for personal transport and city logistics systems on the waterways in urban environments for year- round service. The long-term goal is to identify transport systems and technical solutions for the wa- terways that can be scaled and adapted to urban environments around the world and that complement the land-based transport systems in order to achieve an over-all sustainable urban mobility.

    This work focuses on a systems engineering perspective and includes identification of system bounda- ries and interfaces to other public transport, infrastructure nodes, system service and maintenance and measurement of sustainability and service improvement targets. The aim is to develop a base for a system that can be scaled and adapted to urban environments around the world - like how road or rail- based mass transit systems today are built up from more or less standard units, not to design a public transport solution for a specific city, route or line. The focus is on realistic solutions that are both achievable from a cost perspective and attractive to passengers during 365 days a year. New concepts, ranging from small single person commuters up to large public transport systems, are to be explored and evaluated and key technical challenges identified and targeted.

    The research initiative Waterway 365 was initiated by The Royal Institute of Technology (KTH) and Vattenbussen AB with support from the Swedish Maritime Administration (Proj. no: 15041-0). 

  • 36.
    Zhang, Meng
    et al.
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Cheemakurthy, Harsha
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Ehlers, Soren
    Hamburg University of Technology.
    Polach, R. U. Franz von Bock und
    Hamburg University of Technology.
    Garme, Karl
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg, Marina system.
    Burman, Magnus
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Ice Pressure Prediction Based on the Probabilistic Method for Ice-Going Vessels in Inland Waterways2018Ingår i: Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, ISSN 0892-7219, E-ISSN 1528-896X, Vol. 141Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    With increasing need to utilize inland waterways (IWW), the design for IWW vessels gains attention both from a transport efficiency and an emission control point of view. The primarily issue is to estimate the ice pressure acting on the ship hull for inland waterways. Ice information for Lake Mälaren is extracted and analysed in this work. Since the ice properties have great influence on the impact load, they are studied based on empirical formulae and are calibrated by reference data. The ice impact is then predicted for an inland water barge. Probabilistic method is selected to derive the load based on available field test data. Several parent datasets are chosen, and different design strategies are implemented to evaluate the ice impact load and investigate the influences from exposure factors. The paper finds that the design curve of α = 0.265α-0.57 can be used for Lake Mälaren. The approach itself introduces a possible way to investigate loads on ice affected IWW.With increasing need to utilize inland waterways (IWW), the design for IWW vessels gains attention both from a transport efficiency and an emission control point of view. The primarily issue is to estimate the ice pressure acting on the ship hull for inland waterways. Ice information for Lake Mälaren is extracted and analysed in this work. Since the ice properties have great influence on the impact load, they are studied based on empirical formulae and are calibrated by reference data. The ice impact is then predicted for an inland water barge. Probabilistic method is selected to derive the load based on available field test data. Several parent datasets are chosen, and different design strategies are implemented to evaluate the ice impact load and investigate the influences from exposure factors. The paper finds that the design curve of α = 0.265α-0.57 can be used for Lake Mälaren. The approach itself introduces a possible way to investigate loads on ice affected IWW.

1 - 36 av 36
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