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Controlling the Roll Responses of Volume Carriers
KTH, School of Engineering Sciences (SCI). Wallenius Marine AB. (Marina System, KTH)
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Modern volume carriers such as container vessels, cruise ships and Pure Car and Truck Carriers (PCTC’s) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this doctoral thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents a holistic framework for predicting and assessing the roll damping, which is a crucial parameter for predicting roll motions, based on a unique combination of full scale trials, model tests, semi-empirical methods and computational fluid dynamics. The framework is intended to be used from the early design stage and gradually improved until delivery of the ship and finally to provide input for decision support in the operation. The thesis also includes a demonstration of a new application for rudder control to be used for mitigation of parametric roll. This is performed by simulating real incidents that have occurred with PCTC’s in service. Simulations with rudder roll control show promising results and reveal that the approach could be very efficient for mitigation of parametric roll. Finally, an approach for monitoring of roll induced stresses, so-called racking stresses in PCTC’s, is presented. The approach involves measurement of the ship motions and scaling of pre-calculated structural responses from global finite element analysis. Based on full scale motion and stress measurements from a PCTC in-service the approach is evaluated and demonstrated to be an efficient alternative to conventional methods.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. , p. 24
Series
TRITA-AVE, ISSN 1651-7660 ; 2017-22
Keywords [en]
PCTC, parametric roll, roll response, roll damping, rudder control, aerodynamic roll damping, roll mitigation, racking, Ikeda’s method, CFD, model tests, Full-scale tests
National Category
Engineering and Technology
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-207125ISBN: 978-91-7729-340-8 (print)OAI: oai:DiVA.org:kth-207125DiVA, id: diva2:1095965
Public defence
2017-05-05, Sal F3, Lindstedtsvägen 26, Stockholm, 14:51 (English)
Opponent
Supervisors
Funder
The Swedish Mercantile Marine Foundation
Note

QC 20170516

Available from: 2017-05-17 Created: 2017-05-16 Last updated: 2017-05-17Bibliographically approved
List of papers
1. Assessment of Ship Roll Damping through Full-Scale and Model-Scale Experiments and Semi-Empirical Methods
Open this publication in new window or tab >>Assessment of Ship Roll Damping through Full-Scale and Model-Scale Experiments and Semi-Empirical Methods
Show others...
2012 (English)In: 11th International Conference on the Stability of Ships and Ocean Vehicles, 2012Conference paper, Published paper (Other academic)
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-121275 (URN)
Conference
11th International Conference on the Stability of Ships and Ocean Vehicles
Note

QC 20130424

Available from: 2013-04-24 Created: 2013-04-24 Last updated: 2017-05-16Bibliographically approved
2. Ikeda Revisited
Open this publication in new window or tab >>Ikeda Revisited
2017 (English)In: Journal of Marine Science and Technology, ISSN 0948-4280, E-ISSN 1437-8213Article in journal (Refereed) Submitted
Abstract [en]

In this paper Ikeda’s method for roll damping prediction is revisited and the applicability of the method to modern volume carriers is considered. For volume carriers the hull lift and bilge keel components are the dominating components and the estimation of these components in the original method are benchmarked and scrutinized. It is concluded that the speed dependence of the bilge keels damping is underestimated by the original method. This is partially explained by that Ikeda seems to have underestimated the lift force of the bilge keels in his analytical expressions. Correcting for this and taking account of the lift force generated pressure on the hull surface gives overall better agreement with model tests. It is also concluded that the hull lift damping component is significantly overestimated with the original method. Non-viscid CFD is used to propose a new generic expression for estimating the lift coefficients for volume carriers which greatly improve the accuracy in comparison to model test results. With these improvements Ikeda’s method is revitalized and the applicability is extended to unconventional volume carriers.

Place, publisher, year, edition, pages
Springer, 2017
Keywords
Ikeda´s method, roll damping, CFD, model tests, bilge keels, hull lift, volume carrier
National Category
Engineering and Technology Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-207133 (URN)
Funder
The Swedish Mercantile Marine Foundation
Note

QC 20170517

Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-05-17Bibliographically approved
3. On Aerodynamical Roll Damping
Open this publication in new window or tab >>On Aerodynamical Roll Damping
2015 (English)In: Proceedings of the 12th International Conference on the Stability ofShips and Ocean Vehicles, 14-19 June 2015, Glasgow, UK., 2015Conference paper, Published paper (Refereed)
Abstract [en]

In this paper an approach for estimating aerodynamic roll damping is formulated. The approach utilizes wind tunnel tests and the concept of effective levers to relate roll induced apparent wind to a damping moment. Evaluation of the approach on a typical PCTC demonstrates that the aerodynamic damping in certain conditions can be of similar magnitude as the hydrodynamic damping when the weather is rough. The importance of considering this component in the formulation of operational guidance with respect to parametric roll is highlighted using analysis of a real incident and simplistic simulations.

Keywords
Roll damping, Parametric roll, Roll decay, Wind damping, Aerodynamic damping, Wind tunnel tests
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-207124 (URN)
Conference
Conference on the Stability of Ships and Ocean Vehicles
Funder
The Swedish Mercantile Marine Foundation
Note

QC 20170516

Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-11-10Bibliographically approved
4. A framework for holistic roll damping prediction
Open this publication in new window or tab >>A framework for holistic roll damping prediction
2015 (English)In: Proceedings of the 15th International Ship Stability Workshop, 13-15 June 2016, Stockholm, Sweden, 2015Conference paper, Published paper (Refereed)
Abstract [en]

In this paper a framework for holistic multi-tier roll damping prediction is presented. The approach provides a platform for best possible prediction given the different stages in the ship design process. Starting from the earliest design stage a semi-empirical model gives the foundation for a complete model that is applicable for all possible loading conditions and operational conditions. The components in the model are continuously updated with input from CFD calculations and model tests when available, and finally prior to delivery of the ship the model is assessed and tuned based on full scale trials. The approach is well suited to be used as roll damping input in operational guidance systems as well as to provide feedback to the design process in a systematic manner.

Keywords
Roll damping, Roll decay, Ikeda’s method, Full-scale, Model-scale, Holistic, Extrapolation, Operational guidance
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-207117 (URN)
Conference
International Ship Stability Workshop
Funder
The Swedish Mercantile Marine FoundationThe Foundation for Baltic and East European Studies
Note

QC 20170516

Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-11-10Bibliographically approved
5. Parametric roll mitigation using rudder control
Open this publication in new window or tab >>Parametric roll mitigation using rudder control
Show others...
2013 (English)In: Journal of Marine Science and Technology, ISSN 0948-4280, E-ISSN 1437-8213, Vol. 18, no 3, p. 395-403Article in journal (Refereed) Published
Abstract [en]

Severe roll angles can be developed by parametric excitation in relatively moderate weather without any apparent pre-warning for the crew onboard. In this study the prospect of using rudder control to mitigate parametric roll was investigated using multi-degree of freedom simulations. A typical modern Pure Car and Truck Carrier was considered and modelled by coupling a roll model with a planar motion manoeuvring model. The combined model was calibrated using in-service, full-scale trials and model tests. Irregular variations of the metacentric height were applied to simulate recorded, full-scale events of parametric roll that have occurred with the considered design. These simulations with rudder roll control showed promising results and demonstrate that the approach could be very efficient for mitigation of parametric roll.

Keywords
mitigation, parametric roll, pctc, roll damping, rudder roll control
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-121273 (URN)10.1007/s00773-013-0216-3 (DOI)000324110700010 ()2-s2.0-84884288014 (Scopus ID)
Note

QC 20131003

Available from: 2013-04-24 Created: 2013-04-24 Last updated: 2017-12-06Bibliographically approved
6. Motion-based monitoring of racking stresses in ro-ro ships
Open this publication in new window or tab >>Motion-based monitoring of racking stresses in ro-ro ships
2012 (English)In: Ships and Offshore Structures, ISSN 1744-5302, E-ISSN 1754-212X, Vol. 7, no 4, p. 389-398Article in journal (Refereed) Published
Abstract [en]

This paper presents a method for monitoring of racking-induced stresses in ro-ro ships. The approach is built on the assumption that the racking stresses are mainly induced by the roll and sway motions and therewith related inertia and gravity forces. The approach involves real-time measurement of the ship motions and scaling of the measured motions with pre-calculated structural responses from finite element analysis. The method is applied to full-scale measurement data from the Wallenius Lines PCTC Mignon. Derived stresses show good agreement with stresses derived from strain gauge measurements, indicating that the method has potential as an alternative to conventional strain-gauge-based monitoring. Motion-based stress monitoring has several potential areas of application such as providing data for decision support, for live assistance and short-term route planning, structural condition reports and for supplying feedback to the design process.

Keywords
racking, hull response monitoring, full-scale measurements, finite element analysis, ro-ro ships, PCTC
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-73230 (URN)10.1080/17445302.2011.594297 (DOI)000311945700004 ()2-s2.0-84870918544 (Scopus ID)
Note

QC 20120202. Available online: 07 Jul 2011

Available from: 2012-02-02 Created: 2012-02-02 Last updated: 2017-12-08Bibliographically approved

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