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Controlling the Roll Responses of PCTC's
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Naval Systems.
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Modern Panamax Pure Car and Truck Carriers (PCTC) have become more vulnerable to critical roll responses as built in margins have been traded against increased transport efficiency. The research presented in this licentiate thesis aims at enhancing the predictability and control of these critical roll responses. The thesis presents the development of a new method for assessing the roll damping, which is a crucial parameter for predicting roll motions. The method involves a unique set up of full scale in-service trials and is straightforward, cost efficient and shows a good potential. 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. Last but not least 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, 2013. , xiii, 14 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2013:18
Keyword [en]
PCTC, parametric roll, roll response, roll damping, rudder control, roll mitigation, racking
National Category
Vehicle Engineering
Identifiers
URN: urn:nbn:se:kth:diva-121207ISBN: 978-91-7501-734-1 (print)OAI: oai:DiVA.org:kth-121207DiVA: diva2:617576
Presentation
2013-05-13, E31, Lindstedtsvägen 3, ½ tr, Kungl Tekniska högskolan, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130424

Available from: 2013-04-24 Created: 2013-04-23 Last updated: 2013-04-24Bibliographically 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
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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. 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, 395-403 p.Article 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.

Keyword
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
3. 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, 389-398 p.Article 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.

Keyword
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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