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Showing 1 to 20 of 35 for “"seakeeping"”.
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Transient seakeeping analysis using generalized modes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1997.
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A SEAKEEPING STUDY ON THE AUTONOMOUS SUSTAINMENT CARGO CONTAINER DELIVERY SYSTEM
… The research to be conducted will focus on the seakeeping characteristics of an autonomous sustainment cargo container and the feasibility of its deployment. Established geometric data will be used along with changing loading characteristics and ride effects. The in depth analysis will be …
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Integrating seakeeping in the design of semi-displacement and displacement monohulls
… in the semidisplacement region. Furthermore, seakeeping at high speeds cannot be reliably calculated by traditional methods such as strip theory due to the hydrodynamic effects that occur in the semidisplacement region. Traditional methods have a vessels' response in seas calculated after most …
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Nonlinear Free Surface and Viscous Effects on Underwater Vehicle Maneuvering and Seakeeping
… by the Lagrangian Nonlinear Maneuvering and Seakeeping (LNMS) model, which provides motion predictions of a vehicle under waves using calculations from first principle energy considerations. While both models provide their own approach to shallowly submerged vehicle motion predictions, each …
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Fabrication of a SWATH vessel scale model for seakeeping tests using rapid prototyping methods
… (USV) that will be used primarily for dynamic seakeeping testing in the MIT Tow Tank. The model represents a design conceived by Stefano Brizzolara, which will be used for launching, recovering, and servicing Unmanned Underwater Vehicles (UUV) at sea. Construction methods included a number of …
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A frequency domain strip theory applied to the seakeeping of the Zumwalt-Class destroyer
Seakeeping analysis of the Zumwalt-Class destroyer was carried out in the framework of linear strip theory and potential flow. First, the problem was formulated and solved analytically. Second, a program called Ship Motions Analyzer (SMA) was written in MATLABTM to carry out the seakeeping analysis …
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USe of seakeeping simulation capabilities in the preliminary phase of the design of multihull vessels
Seakeeping analysis is a fundamental part of the design process of a ship. Due to its complexity, seakeeping analysis is usually completed in a late stage of the design process. Although this approach can be successfully used for monohull vessels, it is not optimal in designing more innovative hull …
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Numerical and experimental investigation of the effect of an inverted bow on the hydrodynamic performance of Navy combatant hull forms
In this paper we investigate the resistance and seakeeping effects of an inverted bow by comparing the motions of an existing combatant hull, the Oliver Hazard Perry class frigate (FFG-7), with a modified version of the same hull with an inverted bow. The bow of the FFG-7 was redesigned by …
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ΒΕΛΤΙΣΤΟΠΟΙΗΣΗ ΜΟΡΦΗΣ ΓΑΣΤΡΑΣ ΠΛΟΙΟΥ ΩΣ ΠΡΟΣ ΤΗ ΣΥΜΠΕΡΙΦΟΡΑ ΣΕ ΚΥΜΑΤΙΣΜΟΥΣ
IN THIS THESIS A NEW METHOD FOR ANALYTICAL SEAKEEPING OPTIMIZATION IS DESCRIBED. THE METHOD IS BASED ON A COMPUTER CODE WHICH PREDICTS SEAKEEPING PERFORMANCE WHEN THE SHIP PROFILE, THE DESIGN WATERLINE, THE SECTIONAL AREA CURVE AND THE DISTRIBUTION ALONG THE SHIP OF THE CENTROID, KB(X) OF THE CROSS …
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State-space modeling and optimal control of ship motions in a seastate
… from first principles for the improvement of the seakeeping performance of high-speed vessels equipped with lifting appendages that are actively controlled in regular and random waves. A ship at sea can experience all the translational and rotational modes of motion that are undesirable, yet …
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The application of advanced hydrodynamic analyses in ship design
… motions and loads in the time domain. Seakeeping analysis has traditionally been incorporated late in the design process, using parametrics and two-dimensional linear strip theory methods in the frequency domain. Model testing, due to its relative expense, is incorporated even later in …
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Examination of hull forms for an Offshore Nuclear Plant
… were modeled to compare the differences in seakeeping and stability. These variants explored the characteristics and combinations of fiat hull plating to replace the original cylinder shape, lengthening the platform to minimize overall depth and draft. The different hulls were modeled and …
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Non-linear rolling of ships in large sea waves
… restoring coefficient introduces into a hull's seakeeping characteristics.
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Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves
… to yield a Lagrangian nonlinear maneuvering and seakeeping (LNMS) model. The LNMS model is numerically validated by confirming the proposed methods and by comparing steady and unsteady hydrodynamic force calculations from the LNMS model against panel code computations for various vessel motions …
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Electric ship digital twin : framework for cyber-physical system security
… of a ship from prime mover to maneuvering, seakeeping, and propeller ventilation in random waves representing the behavior of a physical ship. There is a trend towards increasingly networked sensors and actuators to enable condition monitoring, ensure efficient operation, and allow for …
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Conceptual design of a 30 ft. self-propelled monoform model
… Monoform's performance in calm water and waves (seakeeping) as well as to ascertain the speed-power relationships are also recommended in this report.
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Manoeuvring behaviour of ships in extreme astern seas
… that allows straightforward combination between seakeeping and manoeuvring model whilst accounting for extreme motions. A combination of seakeeping and manoeuvring is achieved through the adoption of relatively new "horizontal body axis system" which accounts for large vertical motions as well. …
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Hydrodynamic evaluation of high-speed semi-SWATH vessels
… studied in terms of calm water resistance and seakeeping response in a bare-hull state, and when equipped with quasi-active lifting appendage control. Analysis was performed on a 10.5m, 10,000kg reduced waterplane area catamaran designed by Lockheed Martin Maritime Systems & Sensors.
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A preliminary design tool for resistance and powering prediction of catamaran vessels
… requirements, economy, space availability and seakeeping. The rapid growth of the market has led to the need for an expanded range of catamaran designs in terms of size, speed, and payload diversity (passengers, vehicles, containers). However, even now, there is a scarcity of publicly available …
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Surfacing Rescue Container concept design for trident submarines
… of imperfect ring stiffened cylinders, and a seakeeping analysis for cylindrical spar buoys.
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