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Publications (10 of 35) Show all publications
Jenkins, A. & Garme, K. (2018). Calculation of wave inputs required when predicting shoreline erosion caused by vessels operating in inland waterways. In: Proceedings of the International Offshore and Polar Engineering Conference: . Paper presented at 28th International Ocean and Polar Engineering Conference, ISOPE 2018, Sapporo, Japan, 10 June 2018 through 15 June 2018 (pp. 1272-1280). International Society of Offshore and Polar Engineers
Open this publication in new window or tab >>Calculation of wave inputs required when predicting shoreline erosion caused by vessels operating in inland waterways
2018 (English)In: Proceedings of the International Offshore and Polar Engineering Conference, International Society of Offshore and Polar Engineers , 2018, p. 1272-1280Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
International Society of Offshore and Polar Engineers, 2018
Keywords
Inland waterways, Modelling, Shoreline erosion, Wake wash
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-238357 (URN)2-s2.0-85053463378 (Scopus ID)9781880653876 (ISBN)
Conference
28th International Ocean and Polar Engineering Conference, ISOPE 2018, Sapporo, Japan, 10 June 2018 through 15 June 2018
Note

QC 20181112

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2018-11-12Bibliographically approved
Zhang, M., Cheemakurthy, H., Ehlers, S., Polach, R. U., Garme, K. & Burman, M. (2018). Ice Pressure Prediction Based on the Probabilistic Method for Ice-Going Vessels in Inland Waterways. Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, 141
Open this publication in new window or tab >>Ice Pressure Prediction Based on the Probabilistic Method for Ice-Going Vessels in Inland Waterways
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2018 (English)In: Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, ISSN 0892-7219, E-ISSN 1528-896X, Vol. 141Article in journal, Editorial material (Refereed) Published
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.

Keywords
Finnish-Swedish ice class regulations (FSICR), Probabilistic method, Ice properties, Ice thickness distribution, Statistical analysis, Fresh Water Ice, Extreme ice pressure, Ice Loads, Inland Waterways, Level Ice, Ship Ice impact, Arctic engineering, Marine engineering, Ships, Water, Fresh Water, Ice resistances, Swedishs, Ice
National Category
Engineering and Technology
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-239026 (URN)
Note

QCR 20181206

Available from: 2018-11-14 Created: 2018-11-14 Last updated: 2018-12-06Bibliographically approved
Zhang, M., Cheemakurthy, H., Ehlers, S., von Bock und Polach, R. U., Garme, K. & Burman, M. (2018). ICE PRESSURE PREDICTION BASED ON THE PROBABILISTIC METHOD FOR ICE-GOING VESSELS IN INLAND WATERWAYS. In: PROCEEDINGS OF THE ASME 37TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2018, VOL 8: . Paper presented at 37th ASME International Conference on Ocean, Offshore and Arctic Engineering, JUN 17-22, 2018, Madrid, SPAIN. AMER SOC MECHANICAL ENGINEERS, Article ID V008T07A038.
Open this publication in new window or tab >>ICE PRESSURE PREDICTION BASED ON THE PROBABILISTIC METHOD FOR ICE-GOING VESSELS IN INLAND WATERWAYS
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2018 (English)In: PROCEEDINGS OF THE ASME 37TH INTERNATIONAL CONFERENCE ON OCEAN, OFFSHORE AND ARCTIC ENGINEERING, 2018, VOL 8, AMER SOC MECHANICAL ENGINEERS , 2018, article id V008T07A038Conference paper, Published paper (Refereed)
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 Malaren 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 alpha = 0.265a(-0.57) can be used for Lake Malaren. The approach itself introduces a possible way to investigate loads on ice affected IWW.

Place, publisher, year, edition, pages
AMER SOC MECHANICAL ENGINEERS, 2018
Series
Proceedings of the ASME International Conference on Ocean Offshore and Arctic Engineering, ISSN 2153-4772
Keywords
IWW, ice data, ice impact load, FSICR, probabilistic method, ice load height
National Category
Civil Engineering
Identifiers
urn:nbn:se:kth:diva-239862 (URN)10.1115/OMAE2018-77668 (DOI)000449724500038 ()2-s2.0-85055559962 (Scopus ID)978-0-7918-5129-6 (ISBN)
Conference
37th ASME International Conference on Ocean, Offshore and Arctic Engineering, JUN 17-22, 2018, Madrid, SPAIN
Note

QC 20181214

Available from: 2018-12-14 Created: 2018-12-14 Last updated: 2018-12-14Bibliographically approved
Cheemakurthy, H., Zhang, M., Garme, K., Burman, M., Ehlers, S., Franz Von Bock, R. U. & Polach, x. (2018). Statistical estimation of uncertainties associated with ship operations in fresh water ice. In: Proceedings of the International Offshore and Polar Engineering Conference: . Paper presented at 28th International Ocean and Polar Engineering Conference, ISOPE 2018, 10 June 2018 through 15 June 2018 (pp. 1608-1615). International Society of Offshore and Polar Engineers
Open this publication in new window or tab >>Statistical estimation of uncertainties associated with ship operations in fresh water ice
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2018 (English)In: Proceedings of the International Offshore and Polar Engineering Conference, International Society of Offshore and Polar Engineers , 2018, p. 1608-1615Conference paper, Published paper (Refereed)
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.

Place, publisher, year, edition, pages
International Society of Offshore and Polar Engineers, 2018
Keywords
Channel Ice, Confidence Interval, Effect Analysis (VMEA), Finnish-Swedish ice class regulations (FSICR), Fish Bone Method, Fresh Water Ice, Ice Loads, Inland Waterways, Level Ice, Ship Ice Resistance, Uncertainty, Variable Mode, Arctic engineering, Marine engineering, Ships, Uncertainty analysis, Water, Effect analysis, Fish bones, Fresh Water, Ice resistances, Swedishs, Ice
National Category
Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:kth:diva-236446 (URN)2-s2.0-85053436824 (Scopus ID)9781880653876 (ISBN)
Conference
28th International Ocean and Polar Engineering Conference, ISOPE 2018, 10 June 2018 through 15 June 2018
Note

QC 20181022

Available from: 2018-10-22 Created: 2018-10-22 Last updated: 2018-10-22Bibliographically approved
Martire, R. L., De Alwis, P., Äng, B. & Garme, K. (2017). Construction of a web-based questionnaire for longitudinal investigation of work exposure, musculoskeletal pain and performance impairments in high-performance marine craft populations. BMJ Open, 7(7), Article ID e016006.
Open this publication in new window or tab >>Construction of a web-based questionnaire for longitudinal investigation of work exposure, musculoskeletal pain and performance impairments in high-performance marine craft populations
2017 (English)In: BMJ Open, ISSN 2044-6055, E-ISSN 2044-6055, Vol. 7, no 7, article id e016006Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
BMJ Publishing Group, 2017
Keywords
content validity, epidemiology, fatigue, high-speed craft, whole-body vibration
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-216314 (URN)10.1136/bmjopen-2017-016006 (DOI)000410203700143 ()2-s2.0-85025168880 (Scopus ID)
Note

QC 20171204

Available from: 2017-12-04 Created: 2017-12-04 Last updated: 2018-03-05Bibliographically approved
Rosén, A., Begovic, E., Razola, M. & Garme, K. (2017). High-speed craft dynamics in waves: challenges and opportunities related to the current safety philosophy. In: : . Paper presented at 16th International Ship Stability Workshop (ISSW 2017), Belgrade, Serbia, 2017..
Open this publication in new window or tab >>High-speed craft dynamics in waves: challenges and opportunities related to the current safety philosophy
2017 (English)Conference paper, Published paper (Other academic)
Abstract [en]

This paper considers the assessment of vertical accelerations of high speed planing craft in waves as the principal element for the risk management approach, i.e. formulation and application of operational limitations and operational guidance. Semi-empirical methods used by classification societies for vertical acceleration assessment are scrutinized. Insights from model experiments performed at the University of Naples “Federico II” (UNINA) and simulations performed at the Royal Institute of Technology (KTH) are presented. Deficiencies of the prevailing semi-empirical methods, and challenges and opportunities with a combined experimental-numerical approach, are discussed in perspective of the IMO high-speed craft safety philosophy.

National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-240876 (URN)
Conference
16th International Ship Stability Workshop (ISSW 2017), Belgrade, Serbia, 2017.
Note

QC 20190109

Available from: 2019-01-04 Created: 2019-01-04 Last updated: 2019-01-09Bibliographically approved
Razola, M., Olausson, K., Garme, K. & Rosén, A. (2016). On high-speed craft acceleration statistics. Ocean Engineering, 114, 115-133
Open this publication in new window or tab >>On high-speed craft acceleration statistics
2016 (English)In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 114, p. 115-133Article in journal (Refereed) Published
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.

Keywords
Slamming, High-speed craft statistics, Acceleration, Experiments, Simulations
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-185379 (URN)10.1016/j.oceaneng.2016.01.004 (DOI)000372382000011 ()2-s2.0-84957010524 (Scopus ID)
Note

QC 20160418

Available from: 2016-04-18 Created: 2016-04-18 Last updated: 2017-11-30Bibliographically approved
Razola, M., Rosén, A. & Garme, K. (2014). Allen and Jones revisited. Ocean Engineering, 89, 119-133
Open this publication in new window or tab >>Allen and Jones revisited
2014 (English)In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 89, p. 119-133Article in journal (Refereed) Published
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.

Keywords
Local slamming, High-speed craft, Structural design, Experiments, Finite-element modeling
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-156124 (URN)10.1016/j.oceaneng.2014.07.005 (DOI)000343690000011 ()2-s2.0-84906718892 (Scopus ID)
Note

QC 20141217

Available from: 2014-12-17 Created: 2014-11-21 Last updated: 2017-12-05Bibliographically approved
Razola, M., Rosén, A. & Garme, K. (2014). Experimental Evaluation of Slamming Pressure Models Used in Structural Design of High-Speed Craft. International Shipbuilding Progress, 61(1-2), 17-39
Open this publication in new window or tab >>Experimental Evaluation of Slamming Pressure Models Used in Structural Design of High-Speed Craft
2014 (English)In: International Shipbuilding Progress, ISSN 0020-868X, E-ISSN 1566-2829, Vol. 61, no 1-2, p. 17-39Article in journal (Refereed) Published
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.

Keywords
Local slamming, structural loads, high-speed craft, experiments, finite element modeling
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-118808 (URN)10.3233/ISP-130104 (DOI)2-s2.0-84898473968 (Scopus ID)
Note

QC 20150624

Available from: 2013-02-28 Created: 2013-02-28 Last updated: 2017-12-06Bibliographically approved
Olausson, K. & Garme, K. (2014). Prediction and evaluation of working conditions on high-speed craft using suspension seat modelling. Journal of Engineering for the Maritime Environment (Part M), 229(3), 281-290
Open this publication in new window or tab >>Prediction and evaluation of working conditions on high-speed craft using suspension seat modelling
2014 (English)In: Journal of Engineering for the Maritime Environment (Part M), ISSN 1475-0902, E-ISSN 2041-3084, Vol. 229, no 3, p. 281-290Article in journal (Refereed) Published
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.

Keywords
Whole-body vibration, high-speed craft, working conditions, seat model, apparent mass, simulation, ergonomics/human factors, ISO 2631-1:1997, ISO 2631-4:2004, vibration dose
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-159159 (URN)10.1177/1475090213515641 (DOI)000358451100005 ()2-s2.0-84937877525 (Scopus ID)
Note

QC 20150814

Available from: 2015-01-22 Created: 2015-01-22 Last updated: 2017-12-05Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-9110-9401

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