subject:( Catamarans)

University of Tasmania

1. Whelan, James Robert. Wetdeck slamming of high-speed catamarans with a centre bow.

Degree: 2004, University of Tasmania

URL: https://eprints.utas.edu.au/22141/1/whole_WhelanJamesRobert2005_thesis.pdf

► The influence of a centre bow on the severe wetdeck slamming behaviour for a range of hull forms based on an INCAT fast catamaran ferry… (more)

▼ The influence of a centre bow on the severe wetdeck slamming behaviour for a range of hull forms based on an INCAT fast catamaran ferry has been studied with full-scale trials, experimental drop tests and computationally. Particular attention was paid to the effect centre bow geometry has on the severity of slam events. Full-scale trial data from a 96m INCAT vessel was analysed. The influence of vessel Froude number, wave height, relative centre bow impact velocity, relative centre bow submergence and instantaneous wave height on the slamming behaviour of the vessel was identified. Severe slams were found to be caused by wetdeck slamming. The average relative motion between the centre bow and the instantaneous water surface during slamming was calculated and this was used for scaling of the experimental drop tests. Two-dimensional drop tests were used to experimentally investigate the behaviour of seven realistic bow geometries for catamarans with centre bow, and two vee wedge geometries. Drop tests were made under gravity with varied drop heights and mass into a long thin tank of calm water. Acceleration and surface pressure measurements and high-speed photography flow visualisation were used to detail model behaviour. The most significant observations were that the highest point in the arch should be located as far outboard as possible to minimise peak acceleration and that models with large centre bows experience peak acceleration at a lower relative initial water surface penetration depth than models with small centre bows. The trapped air in the top of the arch was also found to be important in attenuating peak acceleration. Two theoretical models were developed to model the drop tests; a one-dimensional added mass theory and a two-dimensional volume of fluid method. The added mass theory was based on von Karman's impact theory coupled with a potential flow model to account for the upwash of water during entry and a compressible air model to describe the effect of trapped air in the arch between the hulls. This theory was found to capture the trends displayed in the drop test experiments adequately. The volume of fluid method modelled the drop tests by solution of the Euler equations on a rectangular grid. The model was validated against the broken dam problem, the run up of a Laitone wave and the wedge entry problem.

Subjects/Keywords: Catamarans

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APA (6^th Edition):

Whelan, J. R. (2004). Wetdeck slamming of high-speed catamarans with a centre bow. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/22141/1/whole_WhelanJamesRobert2005_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Whelan, James Robert. “Wetdeck slamming of high-speed catamarans with a centre bow.” 2004. Thesis, University of Tasmania. Accessed January 20, 2021. https://eprints.utas.edu.au/22141/1/whole_WhelanJamesRobert2005_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Whelan, James Robert. “Wetdeck slamming of high-speed catamarans with a centre bow.” 2004. Web. 20 Jan 2021.

Vancouver:

Whelan JR. Wetdeck slamming of high-speed catamarans with a centre bow. [Internet] [Thesis]. University of Tasmania; 2004. [cited 2021 Jan 20]. Available from: https://eprints.utas.edu.au/22141/1/whole_WhelanJamesRobert2005_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Whelan JR. Wetdeck slamming of high-speed catamarans with a centre bow. [Thesis]. University of Tasmania; 2004. Available from: https://eprints.utas.edu.au/22141/1/whole_WhelanJamesRobert2005_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Florida Atlantic University

2. Prasad, Bijoy. HYDRODYNAMIC PERFORMANCE OF AN UNMANNED CATAMARAN VEHICLE IN HEAD SEAS.

Degree: 2019, Florida Atlantic University

URL: http://fau.digital.flvc.org/islandora/object/fau:42202

►

This study analyzes the hydrodynamic performance of an advanced catamaran vehicle using computational fluid dynamics (CFD) simulations and experimental testing data in support of system… (more)

Subjects/Keywords: Catamarans; Computational fluid dynamics; Water waves

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APA (6^th Edition):

Prasad, B. (2019). HYDRODYNAMIC PERFORMANCE OF AN UNMANNED CATAMARAN VEHICLE IN HEAD SEAS. (Thesis). Florida Atlantic University. Retrieved from http://fau.digital.flvc.org/islandora/object/fau:42202

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Prasad, Bijoy. “HYDRODYNAMIC PERFORMANCE OF AN UNMANNED CATAMARAN VEHICLE IN HEAD SEAS.” 2019. Thesis, Florida Atlantic University. Accessed January 20, 2021. http://fau.digital.flvc.org/islandora/object/fau:42202.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Prasad, Bijoy. “HYDRODYNAMIC PERFORMANCE OF AN UNMANNED CATAMARAN VEHICLE IN HEAD SEAS.” 2019. Web. 20 Jan 2021.

Vancouver:

Prasad B. HYDRODYNAMIC PERFORMANCE OF AN UNMANNED CATAMARAN VEHICLE IN HEAD SEAS. [Internet] [Thesis]. Florida Atlantic University; 2019. [cited 2021 Jan 20]. Available from: http://fau.digital.flvc.org/islandora/object/fau:42202.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Prasad B. HYDRODYNAMIC PERFORMANCE OF AN UNMANNED CATAMARAN VEHICLE IN HEAD SEAS. [Thesis]. Florida Atlantic University; 2019. Available from: http://fau.digital.flvc.org/islandora/object/fau:42202

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tasmania

3. Thomas, Giles(Giles Anthony). Wave slam response of large high-speed catamarans.

Degree: 2003, University of Tasmania

URL: https://eprints.utas.edu.au/22112/1/whole_ThomasGilesAnthony2003_thesis.pdf

► The rapid evolution of high-speed sea transportation has led to the development of large, fast, lightweight vessels. The structural design optimisation of such vessels requires… (more)

▼ The rapid evolution of high-speed sea transportation has led to the development of large, fast, lightweight vessels. The structural design optimisation of such vessels requires knowledge of the effect of sea loads on their structure. Of particular importance for high-speed catamarans are severe wet-deck slam events, which can impart a large global load onto a vessel's structure and as a consequence cause significant structural damage. The dynamic whipping response of the structure may also be important by making a significant contribution to fatigue damage. Extensive full-scale hull stress, motion and wave measurements were conducted on two Incat high-speed catamaran ferries. A definition of a slam event, for these vessels, was proposed and used to identify slam events from the data records. The character and effects of these slamming events are investigated with respect to a number of factors. Slam events were found to produce bending moments up to 700% of the largest underlying global wave loads. The data from the full-scale slam events, including an extreme slam event that caused extensive structural damage, was used in conjunction with finite element modelling to develop a realistic quasi-static slam loading scenario for structural design purposes. This slam load case gives a maximum bending moment approximately 16% greater than that stipulated by classification society Det Norske Veritas, with a greater bias towards the bow of the vessel. A method for scaling the design load case for use with new designs is also proposed. A technique for predicting the mode shape and frequency of the whipping behaviour utilising finite element analysis including the fluid-structure interaction is presented. The hydrodynamic added mass of the surrounding fluid was calculated using a two-dimensional panel method for a range of speeds. The calculated whipping modes are then compared favourably with those found through the full-scale measurements and exciter experiments. The exciter experiments were conducted on two vessels with the anchors being dropped and instantaneously arrested to excite the vessels' first longitudinal mode of vibration. The level of damping of the whipping behaviour is investigated through the full-scale results and exciter experiments. Methods for evaluating the various hydrodynamic components which constitute the damping are also presented including wavemaking damping, viscous damping and acoustic damping. It is concluded that structural damping is the dominant damping component. Fatigue life estimates, utilising full-scale slam data and derived whipping behaviour information, were conducted which found that slamming and whipping behaviour have a large influence on fatigue life. Finally, knowledge of the dynamic slamming response was utilised to develop a dynamic extreme slam design load case. This dynamic load case more realistically simulates the dynamic structural response of the vessel to a slam. It is the core component of a new practical methodology for the structural…

Subjects/Keywords: Catamarans; Ferries; Ocean wave power

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APA (6^th Edition):

Thomas, G. A. (2003). Wave slam response of large high-speed catamarans. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/22112/1/whole_ThomasGilesAnthony2003_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Thomas, Giles(Giles Anthony). “Wave slam response of large high-speed catamarans.” 2003. Thesis, University of Tasmania. Accessed January 20, 2021. https://eprints.utas.edu.au/22112/1/whole_ThomasGilesAnthony2003_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Thomas, Giles(Giles Anthony). “Wave slam response of large high-speed catamarans.” 2003. Web. 20 Jan 2021.

Vancouver:

Thomas GA. Wave slam response of large high-speed catamarans. [Internet] [Thesis]. University of Tasmania; 2003. [cited 2021 Jan 20]. Available from: https://eprints.utas.edu.au/22112/1/whole_ThomasGilesAnthony2003_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Thomas GA. Wave slam response of large high-speed catamarans. [Thesis]. University of Tasmania; 2003. Available from: https://eprints.utas.edu.au/22112/1/whole_ThomasGilesAnthony2003_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Florida Atlantic University

4. Diddams, Michael Albert. A Low-Level USV Controller Incorporating an Environmental Disturbance Observer.

Degree: MS, 2018, Florida Atlantic University

URL: http://purl.flvc.org/fau/fd/FA00013022

►

Summary: Modeling, system identification and controller design for a 16’ catamaran is described with the objective of enhanced operation in the presence of environmental disturbances… (more)

Subjects/Keywords: Unmanned surface vehicles; Environmental disturbances; Catamarans – Design and construction

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APA (6^th Edition):

Diddams, M. A. (2018). A Low-Level USV Controller Incorporating an Environmental Disturbance Observer. (Masters Thesis). Florida Atlantic University. Retrieved from http://purl.flvc.org/fau/fd/FA00013022

Chicago Manual of Style (16^th Edition):

Diddams, Michael Albert. “A Low-Level USV Controller Incorporating an Environmental Disturbance Observer.” 2018. Masters Thesis, Florida Atlantic University. Accessed January 20, 2021. http://purl.flvc.org/fau/fd/FA00013022.

MLA Handbook (7^th Edition):

Diddams, Michael Albert. “A Low-Level USV Controller Incorporating an Environmental Disturbance Observer.” 2018. Web. 20 Jan 2021.

Vancouver:

Diddams MA. A Low-Level USV Controller Incorporating an Environmental Disturbance Observer. [Internet] [Masters thesis]. Florida Atlantic University; 2018. [cited 2021 Jan 20]. Available from: http://purl.flvc.org/fau/fd/FA00013022.

Council of Science Editors:

Diddams MA. A Low-Level USV Controller Incorporating an Environmental Disturbance Observer. [Masters Thesis]. Florida Atlantic University; 2018. Available from: http://purl.flvc.org/fau/fd/FA00013022

University of Tasmania

5. Mustaffa Kamal, IZ. The powering performances of large waterjet and propeller driven catamarans at medium-speed.

Degree: 2019, University of Tasmania

URL: https://eprints.utas.edu.au/34064/1/Mustaffa_Kamal_whole_thesis.pdf ; Mustaffa Kamal, IZ ORCID: 0000-0002-5228-723X <https://orcid.org/0000-0002-5228-723X> 2019 , 'The powering performances of large waterjet and propeller driven catamarans at medium-speed', PhD thesis, University of Tasmania.

► Wave-piercing catamaran builder INCAT has been developing new energy-efficient hull forms for medium speeds operation (Froude number between 0.25 to 0.50), to reduce the environmental… (more)

▼ Wave-piercing catamaran builder INCAT has been developing new energy-efficient hull forms for medium speeds operation (Froude number between 0.25 to 0.50), to reduce the environmental impact of fast sea transportation. This research focused on the investigation into the performance of the potential propulsors for these new medium-speed catamarans which could either be waterjets or propellers. The challenge is in defining the appropriate speed changeover point between using waterjets and propellers for large catamarans operating in the medium speed regime. The main approach in determining which propulsor is more efficient was to perform experimental model testing of a self-propelled catamaran using a towing tank. These tests were done for both propeller and waterjet propulsion. A single demihull test using the tank wall as the plane of symmetry was employed rather than using the whole catamaran model in order to maximise the size of the model. The comparison of these two types of propulsion required new studies in several areas. A study was made as to investigate the magnitude of the scale effect on the small propeller used in the self-propulsion test. A method of scale effect correction was proposed as the scale effect corrections on the propeller proposed by ITTC 1978 method are inappropriate for corrections over large scales for variations in propulsors. The self-propulsion test (SPT) only method was chosen over the traditional ITTC 1978 method as some of the empirical approximation in the ITTC 1978 method were not applicable; uncertainty analysis revealed that the SPT method has lower uncertainties than the traditional ITTC 1978 method. The two catamaran models had a different hullform designed to the specific propulsion method. So both of these catamarans could not be directly compared as the length to displacement ratios and the wetted surface area ratio were not identical. Therefore comparative methods that can adequately compare these two catamarans were sought. Three approaches were made in order to assess the merit of the waterjet and the propeller as the propulsor for the medium-speed catamaran: an approach using the propulsive efficiency, an approach using transport efficiency or transport factor and an approach using a scaling to a similar size method. The study on the propulsive efficiency showed that the propeller catamaran is more efficient than the waterjet catamaran up to a Froude number of 0.33. In the transport efficiency approach, the propeller catamaran was found to be more efficient than the waterjet catamaran up to a Froude number of 0.44, at higher speeds waterjets become superior. Similar results were found using the scaling to a similar size method. These findings suggest that the propeller propulsion is considered to be the best option for a large energy-efficient catamaran operating in the medium-speed regime. Finally, methods of improving the ship powering prediction method for catamarans are proposed, based on the reasons for the variation in Froude number cross-overs from the…

Subjects/Keywords: Catamarans; Propulsion; Extrapolation Procedure; Propeller Scale-Effect; Transport Efficiency

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Mustaffa Kamal, I. (2019). The powering performances of large waterjet and propeller driven catamarans at medium-speed. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/34064/1/Mustaffa_Kamal_whole_thesis.pdf ; Mustaffa Kamal, IZ ORCID: 0000-0002-5228-723X <https://orcid.org/0000-0002-5228-723X> 2019 , 'The powering performances of large waterjet and propeller driven catamarans at medium-speed', PhD thesis, University of Tasmania.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mustaffa Kamal, IZ. “The powering performances of large waterjet and propeller driven catamarans at medium-speed.” 2019. Thesis, University of Tasmania. Accessed January 20, 2021. https://eprints.utas.edu.au/34064/1/Mustaffa_Kamal_whole_thesis.pdf ; Mustaffa Kamal, IZ ORCID: 0000-0002-5228-723X <https://orcid.org/0000-0002-5228-723X> 2019 , 'The powering performances of large waterjet and propeller driven catamarans at medium-speed', PhD thesis, University of Tasmania..

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mustaffa Kamal, IZ. “The powering performances of large waterjet and propeller driven catamarans at medium-speed.” 2019. Web. 20 Jan 2021.

Vancouver:

Mustaffa Kamal I. The powering performances of large waterjet and propeller driven catamarans at medium-speed. [Internet] [Thesis]. University of Tasmania; 2019. [cited 2021 Jan 20]. Available from: https://eprints.utas.edu.au/34064/1/Mustaffa_Kamal_whole_thesis.pdf ; Mustaffa Kamal, IZ ORCID: 0000-0002-5228-723X <https://orcid.org/0000-0002-5228-723X> 2019 , 'The powering performances of large waterjet and propeller driven catamarans at medium-speed', PhD thesis, University of Tasmania..

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mustaffa Kamal I. The powering performances of large waterjet and propeller driven catamarans at medium-speed. [Thesis]. University of Tasmania; 2019. Available from: https://eprints.utas.edu.au/34064/1/Mustaffa_Kamal_whole_thesis.pdf ; Mustaffa Kamal, IZ ORCID: 0000-0002-5228-723X <https://orcid.org/0000-0002-5228-723X> 2019 , 'The powering performances of large waterjet and propeller driven catamarans at medium-speed', PhD thesis, University of Tasmania.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tasmania

6. Shabani, B. The effects of tunnel height and centre bow length on motions and slam loads in large wave piercing catamarans.

Degree: 2017, University of Tasmania

URL: https://eprints.utas.edu.au/23923/1/Shabani_whole_thesis.pdf

► An above water centre bow in wave piercing catamarans provides additional reserve buoyancy for minimising deck diving in following seas. The centre bow entry in… (more)

▼ An above water centre bow in wave piercing catamarans provides additional reserve buoyancy for minimising deck diving in following seas. The centre bow entry in waves, however, contributes to the severity of the wet-deck arch slam loads and slam induced bending moments. In this thesis, the effects of the centre bow length and wet-deck height/tunnel clearance on the motions and slam loads in large wave piercing catamarans are investigated through model tests to establish a framework for the preliminary design analysis. The model tests were performed in regular waves in head seas using a 2.5 m hydroelastic segmented catamaran model designed with an adjustable wet-deck and a changeable centre bow segment. Five different centre bow and wet-deck configurations were considered and over 500 towing tests were performed at two model speeds, in three wave heights and for various wave encounter frequencies. The catamaran model was comprehensively instrumented to measure the pitch and heave, centre bow loads, centre bow accelerations, wet-deck arch slam pressures and the vertical bending moments at two segment cuts located in each port and starboard demihull. Motion analyses showed that both heave and pitch increased over a wide range of encounter wave frequency as the wet-deck height of the catamaran model increased. Increasing the length of the centre bow showed an increase in the pitch but a decrease in the heave for a particular range of encounter wave frequency. The vertical motions along the model length indicated that the position of minimum vertical displacements and accelerations were aft of the LCG, between 20% and 38% of the overall length from the transom. The increase in wet-deck and consequently the archways clearance also resulted in an increase in relative vertical displacement in the centre bow area. This indicated that although the wet deck height had been increased, the consequent increase in motion still caused slamming to occur. In dynamic analyses, the maximum force acting on the centre bow segment during a slam event was decomposed into a bow entry force and a slam force. It was found that the slamming force, the centre bow entry force and slam induced bending moment increase as the centre bow length increases. Increasing the wet-deck height reduced the maximum slam load and pressure in moderate waves, but not in large waves. A correlation analysis between the slam force and slam pressure showed that the slam loads increase in the longer centre bows because of the increase in the impact area. The location of maximum pressures along the centre bow length was more related to the encounter wave frequency rather than the centre bow configurations. The distribution of the peak pressures within the centre bow archways showed that the inboard peak pressures were higher than the top arch and outboard peak pressures. The slam occurrence and severity for different centre bow and wet-deck configurations were analysed by considering the centre bow immersion depth and relative velocity at slam using the undisturbed…

Subjects/Keywords: catamarans; slamming; motions; hydro elastic segmented model; centre bow; wet deck; head seas; model test

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APA (6^th Edition):

Shabani, B. (2017). The effects of tunnel height and centre bow length on motions and slam loads in large wave piercing catamarans. (Thesis). University of Tasmania. Retrieved from https://eprints.utas.edu.au/23923/1/Shabani_whole_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Shabani, B. “The effects of tunnel height and centre bow length on motions and slam loads in large wave piercing catamarans.” 2017. Thesis, University of Tasmania. Accessed January 20, 2021. https://eprints.utas.edu.au/23923/1/Shabani_whole_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Shabani, B. “The effects of tunnel height and centre bow length on motions and slam loads in large wave piercing catamarans.” 2017. Web. 20 Jan 2021.

Vancouver:

Shabani B. The effects of tunnel height and centre bow length on motions and slam loads in large wave piercing catamarans. [Internet] [Thesis]. University of Tasmania; 2017. [cited 2021 Jan 20]. Available from: https://eprints.utas.edu.au/23923/1/Shabani_whole_thesis.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Shabani B. The effects of tunnel height and centre bow length on motions and slam loads in large wave piercing catamarans. [Thesis]. University of Tasmania; 2017. Available from: https://eprints.utas.edu.au/23923/1/Shabani_whole_thesis.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

7. Andrewartha, Michael. Application of hydrofoils to improve the performance of high-speed catamarans.

Degree: Mechanical & Manufacturing Engineering, 2004, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57103 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42490/SOURCE02?view=true

Subjects/Keywords: Catamarans; Hydrofoil boats; Thesis Digitisation Program

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APA (6^th Edition):

Andrewartha, M. (2004). Application of hydrofoils to improve the performance of high-speed catamarans. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57103 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42490/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Andrewartha, Michael. “Application of hydrofoils to improve the performance of high-speed catamarans.” 2004. Doctoral Dissertation, University of New South Wales. Accessed January 20, 2021. http://handle.unsw.edu.au/1959.4/57103 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42490/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Andrewartha, Michael. “Application of hydrofoils to improve the performance of high-speed catamarans.” 2004. Web. 20 Jan 2021.

Vancouver:

Andrewartha M. Application of hydrofoils to improve the performance of high-speed catamarans. [Internet] [Doctoral dissertation]. University of New South Wales; 2004. [cited 2021 Jan 20]. Available from: http://handle.unsw.edu.au/1959.4/57103 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42490/SOURCE02?view=true.

Council of Science Editors:

Andrewartha M. Application of hydrofoils to improve the performance of high-speed catamarans. [Doctoral Dissertation]. University of New South Wales; 2004. Available from: http://handle.unsw.edu.au/1959.4/57103 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:42490/SOURCE02?view=true

Washington State University

8. [No author]. Numerical Modeling of Multi-Surface Planing Hull Hydrodynamics Using Source-Based Boundary Element Method .

Degree: 2017, Washington State University

URL: http://hdl.handle.net/2376/12930

► A source-based boundary element method (BEM) built on the potential flow theory is developed to study hydrodynamic characteristics of multi-surface planing hulls. Initially, both 2D… (more)

▼ A source-based boundary element method (BEM) built on the potential flow theory is developed to study hydrodynamic characteristics of multi-surface planing hulls. Initially, both 2D and 3D numerical models are implemented and validated. Upon validation, the numerical model is applied for three specific hull types to predict their hydrodynamic properties. Firstly, the hydrodynamic performance of a stepped hull with variable deadrise angles is investigated. Secondly, the hydrodynamic inference effect on a symmetric catamaran hull is studied. And lastly, the hydrodynamic parameters are analyzed for the asymmetric catamaran setup. The validation results are presented for the lift coefficient, center of pressure, water surface elevation around the hull, and pressure coefficient. Numerical results are compared with those found in the technical literature. Parametric calculations are carried out for a stepped hull with variable deadrise angles in two-speed regimes and the results are shown for hydrodynamic characteristics of the hull. For the catamaran design, the hydrodynamic interaction between hulls planing parallel to each other is known to become significant when the spacing between hulls is sufficiently small. To investigate this interference effect, calculations are carried out for symmetric hulls in variable speed regimes at different spacings, hull aspect ratio, and deadrise angles. Again, for asymmetric planing hulls, the numerical results are validated with available experimental data and empirical correlations. Parametric calculation results are presented for the lift coefficient and the center of pressure for variable hull geometry, spacings, and speed regimes. It was observed that the wetted surfaces of both fore hull and aft body of the stepped hull have a direct impact on hydrodynamic forces. The downstream shape of the air-ventilated cavity changes drastically for variable aft body compared to the variable fore hull. For the catamaran hull, the interaction effect on the lift is stronger for longer hulls and larger deadrise angles at both moderate and high Froude numbers. The smaller spacings between two demi-hulls yield higher impact on different hydrodynamic parameters. Similarly, for asymmetric catamaran configuration, the lift coefficient is found to increase at smaller hull spacings. However, it decreases at higher Froude numbers and higher deadrise angles. Advisors/Committee Members: Matveev, Konstantin I (advisor).

Subjects/Keywords: Mechanical engineering; Boundary Element Method (BEM); Catamarans; Computation Fluid Dynamics (CFD); Numerical Modeling; Planing Hull; Potential Flow

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APA (6^th Edition):

author], [. (2017). Numerical Modeling of Multi-Surface Planing Hull Hydrodynamics Using Source-Based Boundary Element Method . (Thesis). Washington State University. Retrieved from http://hdl.handle.net/2376/12930

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

author], [No. “Numerical Modeling of Multi-Surface Planing Hull Hydrodynamics Using Source-Based Boundary Element Method .” 2017. Thesis, Washington State University. Accessed January 20, 2021. http://hdl.handle.net/2376/12930.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

author], [No. “Numerical Modeling of Multi-Surface Planing Hull Hydrodynamics Using Source-Based Boundary Element Method .” 2017. Web. 20 Jan 2021.

Vancouver:

author] [. Numerical Modeling of Multi-Surface Planing Hull Hydrodynamics Using Source-Based Boundary Element Method . [Internet] [Thesis]. Washington State University; 2017. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/2376/12930.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

author] [. Numerical Modeling of Multi-Surface Planing Hull Hydrodynamics Using Source-Based Boundary Element Method . [Thesis]. Washington State University; 2017. Available from: http://hdl.handle.net/2376/12930

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

9. Van 't Veer, A.P. Behaviour of catamarans in waves.

Degree: 1998, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36

Subjects/Keywords: seakeeping of catamarans; hydrodynamics; rankine panel methods

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Van 't Veer, A. P. (1998). Behaviour of catamarans in waves. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36

Chicago Manual of Style (16^th Edition):

Van 't Veer, A P. “Behaviour of catamarans in waves.” 1998. Doctoral Dissertation, Delft University of Technology. Accessed January 20, 2021. http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36.

MLA Handbook (7^th Edition):

Van 't Veer, A P. “Behaviour of catamarans in waves.” 1998. Web. 20 Jan 2021.

Vancouver:

Van 't Veer AP. Behaviour of catamarans in waves. [Internet] [Doctoral dissertation]. Delft University of Technology; 1998. [cited 2021 Jan 20]. Available from: http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36.

Council of Science Editors:

Van 't Veer AP. Behaviour of catamarans in waves. [Doctoral Dissertation]. Delft University of Technology; 1998. Available from: http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; urn:NBN:nl:ui:24-uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36 ; http://resolver.tudelft.nl/uuid:fc4c765a-3c7f-412d-9607-94fb9081ff36

Stellenbosch University

10. Loveday, Howard. The design of a hydrofoil system for sailing catamarans.

Degree: Mechanical and Mechatronic Engineering, 2006, Stellenbosch University

URL: http://hdl.handle.net/10019.1/1982

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Thesis (MScEng (Mechanical and Mechatronic Engineering)) – University of Stellenbosch, 2006.

The main objective of this thesis was to design a hydrofoil system without a trim… (more)

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Thesis (MScEng (Mechanical and Mechatronic Engineering)) – University of Stellenbosch, 2006.

The main objective of this thesis was to design a hydrofoil system without a trim and ride height control system and investigate the change in resistance of a representative hull across a typical speed range as a result of the addition of the hydrofoil system, while retaining adequate stability. The secondary objectives were as follows: Find a representative hull of sailing catamarans produced in South Africa, and to establish an appropriate speed range for that hull across which it is to be tested. Test and explain the drag characteristics of this hull. Find a suitable configuration of lifting foils for this hull that would not require any form of trim or ride height control to maintain stability throughout the speed range. Test and compare the resistance characteristics with and without the assistance of lifting foils. Test and explain the effects of leeway and heel on the total hydrodynamic resistance both with and without lifting foils. A representative hull (RH1), based on a statistical analysis of sailing catamarans produced in South Africa and an existing hull design of suitable size, was designed. A speed range was then established (0 – 25 knots) based on the statistics of the original (existing) design. A scaled model (of RH1) of practical and suitable dimensions was designed and manufactured, and its characteristics determined through towing tank testing. A hydrofoil system was then designed and during testing, was adjusted until a stable configuration was found. This resulted in a canard type configuration, with the front foil at the bow and the main foil between the daggerboards. Although a stable configuration was achieved, it was noted that any significant perturbation in the trim of the boat would result in instability and some form of trim control is recommended. The main objective was achieved. The experimental results concluded that a canard configuration was found to be stable for the RH1 (foil positioning already mentioned) and the addition of the hydrofoils provided a significant improvement only above a displacement Froude number of 2, which for our full scale prototype, is equivalent to approximately 14.2 knots. This is in agreement with the results of several other research projects that investigated hydrofoil supported catamarans with semi‐displacement type demi‐hulls. Below displacement Froude number of 2, a significant increase in total hydrodynamic resistance was observed. Since the speed of sailing craft is dependent on wind speed, there will often be conditions of relatively low boat speed (below displacement Froude number of 2). So it was recommended that a prototype design would have a retractable hydrofoil system which could be engaged in suitable conditions (sufficient boat speed). The effects of leeway and heel on the total hydrodynamic resistance were determined experimentally, but it was found that these trends were affected by the resulting changes in wave…

Advisors/Committee Members: Von Backstrom, T. W., Migeotte, G., University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Mechanical engineering; Hydrofoil boats – Design and construction; Catamarans – Design and construction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Loveday, H. (2006). The design of a hydrofoil system for sailing catamarans. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/1982

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Loveday, Howard. “The design of a hydrofoil system for sailing catamarans.” 2006. Thesis, Stellenbosch University. Accessed January 20, 2021. http://hdl.handle.net/10019.1/1982.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Loveday, Howard. “The design of a hydrofoil system for sailing catamarans.” 2006. Web. 20 Jan 2021.

Vancouver:

Loveday H. The design of a hydrofoil system for sailing catamarans. [Internet] [Thesis]. Stellenbosch University; 2006. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10019.1/1982.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Loveday H. The design of a hydrofoil system for sailing catamarans. [Thesis]. Stellenbosch University; 2006. Available from: http://hdl.handle.net/10019.1/1982

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of New South Wales

11. Armstrong, Neville. On the viscous resistance and form factor of high-speed catamaran-ferry hull forms.

Degree: Mechanical & Manufacturing Engineering, 2000, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/55174 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36687/SOURCE01?view=true

Subjects/Keywords: Catamarans design and construction; Ship resistance; Hulls (Naval architecture); Thesis Digitisation Program

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Armstrong, N. (2000). On the viscous resistance and form factor of high-speed catamaran-ferry hull forms. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/55174 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36687/SOURCE01?view=true

Chicago Manual of Style (16^th Edition):

Armstrong, Neville. “On the viscous resistance and form factor of high-speed catamaran-ferry hull forms.” 2000. Doctoral Dissertation, University of New South Wales. Accessed January 20, 2021. http://handle.unsw.edu.au/1959.4/55174 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36687/SOURCE01?view=true.

MLA Handbook (7^th Edition):

Armstrong, Neville. “On the viscous resistance and form factor of high-speed catamaran-ferry hull forms.” 2000. Web. 20 Jan 2021.

Vancouver:

Armstrong N. On the viscous resistance and form factor of high-speed catamaran-ferry hull forms. [Internet] [Doctoral dissertation]. University of New South Wales; 2000. [cited 2021 Jan 20]. Available from: http://handle.unsw.edu.au/1959.4/55174 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36687/SOURCE01?view=true.

Council of Science Editors:

Armstrong N. On the viscous resistance and form factor of high-speed catamaran-ferry hull forms. [Doctoral Dissertation]. University of New South Wales; 2000. Available from: http://handle.unsw.edu.au/1959.4/55174 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:36687/SOURCE01?view=true

Stellenbosch University

12. Kopke, Markus. A passive suspension system for a hydrofoil supported catamaran.

Degree: Mechanical and Mechatronic Engineering, 2008, Stellenbosch University

URL: http://hdl.handle.net/10019.1/1991

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Thesis (MScEng (Mechanical and Mechatronic Engineering)) – University of Stellenbosch, 2008.

This study investigates practical passive methods to improve the seakeeping of a Hydrofoil Supported Catamaran… (more)

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Thesis (MScEng (Mechanical and Mechatronic Engineering)) – University of Stellenbosch, 2008.

This study investigates practical passive methods to improve the seakeeping of a Hydrofoil Supported Catamaran (Hysucat). The Hysucat is a hybrid vessel combining hydrofoil efficiency with the stability of catamarans. The seakeeping of the Hysucat was initially investigated experimentally to determine what seakeeping improvements are inherent to the Hysucat design. The results showed that the seakeeping is improved by 5-30%. A passive suspension system for the main hydrofoil of the Hysucat was designed and tested. A concept development strategy was followed for the design of the suspension system as such a system had never been investigated previously. Detailed specifications for the design were developed and concepts that could satisfy the customer and engineering requirements were generated. Numerical simulation models for the Hysucat and the final concepts were derived assuming a simplified 2nd order system to describe the seakeeping dynamics of the demi-hulls. Unknown parameters were determined using parameter estimation techniques. Representative parameter values were calculated from multiple towing tank experiments. Theory describing the motion of a hydrofoil in an orbital velocity wave field was combined with the hull model to simulate the Hysucat as well as the suspension system concepts. The models indicated that the concept where the main hydrofoil was attached to a spring loaded arm, that was free to pivot in response to orbital waves, was the most feasible in damping out vertical transmitted accelerations. Experimental tests indicated that little improvement was achieved with the suspension system at low frequencies. At resonance the suspension system was effective in decreasing the heave of the vessel by up to 27%. The pitch and acceleration response results showed improvements at the higher encounter frequencies of up to 50%. The calm water resistance of the vessel increased by 10% over the Hysucat with rigidly attached hydrofoils; however was still 24% less than the hull without foils.

Advisors/Committee Members: Van Niekerk, J. L., Migeotte, G., University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Mechanical engineering; Hydrofoil boats – Design and construction; Catamarans – Design and construction; Ships – Hydrodynamics; Mechanical and Mechatronic Engineering

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kopke, M. (2008). A passive suspension system for a hydrofoil supported catamaran. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/1991

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Kopke, Markus. “A passive suspension system for a hydrofoil supported catamaran.” 2008. Thesis, Stellenbosch University. Accessed January 20, 2021. http://hdl.handle.net/10019.1/1991.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Kopke, Markus. “A passive suspension system for a hydrofoil supported catamaran.” 2008. Web. 20 Jan 2021.

Vancouver:

Kopke M. A passive suspension system for a hydrofoil supported catamaran. [Internet] [Thesis]. Stellenbosch University; 2008. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10019.1/1991.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Kopke M. A passive suspension system for a hydrofoil supported catamaran. [Thesis]. Stellenbosch University; 2008. Available from: http://hdl.handle.net/10019.1/1991

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Stellenbosch University

13. Milandri, Giovanni Sergio. Seakeeping control of HYSUCATs.

Degree: Mechanical and Mechatronic Engineering, 2006, Stellenbosch University

URL: http://hdl.handle.net/10019.1/2993

►

Thesis (MScEng (Mechanical and Mechatronic Engineering)) – University of Stellenbosch, 2006.

This thesis investigates practical methods of modelling and control of the vertical motions of a… (more)

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Thesis (MScEng (Mechanical and Mechatronic Engineering)) – University of Stellenbosch, 2006.

This thesis investigates practical methods of modelling and control of the vertical motions of a hydrofoil assisted catamaran, the HYSUCAT. The aim of the control application is to reduce the motions, and consequently the motion sickness of the passengers. First, a potential flowcommercial program, POWERSEA,was used to model the system. This uses 2-D strip methods to model the planing hull-form of the vessel, and the Peter du Cane hydrofoil theory for modelling of the foils. These simulations are compared to experimental towing tank results, with fair agreement at lower speeds, but limited applicability at high speeds. Thus for the control design the agreement was insufficient. As an alternative, a simple coupled 2 degree-of-freedom spring - mass - damper model is proposed, for which the equations of motion are derived. This has 9 unknown parameters; three of these aremeasured directly, two are modelled, and the remaining four were identified using an experimental parameter estimation technique. Representative parameter values were calculated frommultiple experiments for application in the control design. The design of a control system was based on the above model. First, an output-weighted Linear Quadratic Regulator (LQR) was designed to obtain the full state feedback gains. A non-linear ’bang-bang’ control design was then implemented to try and speed up the response of the system. These control strategies, as well as no control, were applied in the towing tank in regular waves, with good results at low and medium frequencies. At the design point, 32% and 65% reductions in rms motions were achieved for pitch and heave, respectively. At high frequencies, though, not much improvement was achieved due to the bandwidth limitation of the control system. The LQR results were better overall (reduced motions) across the frequency range than the bang-bang controller, as well as having a lower added resistance in waves. The control design of the output-weighted LQR was then revised to be based on alternative outputs, as a possible improvement. However, a further two controller designs did not yield any noticeable improvement and were not developed further.

Advisors/Committee Members: Van Niekerk, J. L., Migeotte, G., University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..

Subjects/Keywords: Mechanical engineering; Hydrofoil boats – Design and construction; Catamarans – Design and construction; Hulls (Naval architecture); Ships – Hydrodynamics; Mechanical and Mechatronic Engineering

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Milandri, G. S. (2006). Seakeeping control of HYSUCATs. (Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/2993

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Milandri, Giovanni Sergio. “Seakeeping control of HYSUCATs.” 2006. Thesis, Stellenbosch University. Accessed January 20, 2021. http://hdl.handle.net/10019.1/2993.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Milandri, Giovanni Sergio. “Seakeeping control of HYSUCATs.” 2006. Web. 20 Jan 2021.

Vancouver:

Milandri GS. Seakeeping control of HYSUCATs. [Internet] [Thesis]. Stellenbosch University; 2006. [cited 2021 Jan 20]. Available from: http://hdl.handle.net/10019.1/2993.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Milandri GS. Seakeeping control of HYSUCATs. [Thesis]. Stellenbosch University; 2006. Available from: http://hdl.handle.net/10019.1/2993

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations