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The Impulse Response Function and Ship Motions

The Impulse Response Function and Ship Motions
Author: W. E. Cummins
Publisher:
Total Pages: 11
Release: 1962
Genre: Ships
ISBN:

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After a review of the deficiencies of the usual equations of motion for an oscillating ship, two new representations are given. One makes use of the impulse response function and depends only upon the system being linear. The response is given as a convolution integral over th past history of the exciting force with the impulse response funcion appearing as the kernel. The second representation is based upon a hydrodynamic study, and new forms for the equations of motion are exhibited. The equations resemble the usual equations, with the addition of convolution integrals over the past history of the velocity. However, the coefficients in these new equations are independent of frequency, as are the kernel functions in the convolution integrals. Both representations are quite general and apply to transient motions as well as periodic. The relations between the two representations are given. The treatment considers six degrees of freedom, with linear coupling between the various modes. (Author).


The Deterministic Evaluation of Ship Motion Impulse Response Functions

The Deterministic Evaluation of Ship Motion Impulse Response Functions
Author: Richard J. Wheeler
Publisher:
Total Pages: 54
Release: 1972
Genre: Ships
ISBN:

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An investigation of the applicability of the Jacobi Function orthogonal polynomial representation of the impulse response function for the determination of ship motion from towing tank tests with irregular waves has been initiated. An analysis of the inverse Fourier transformability of the frequency domain gain and phase information obtained in lieu of time domain impulse response function is given with observations of areas of fallibility and recommendations on circumventive methods.


Ship Motions and Drag Reduction

Ship Motions and Drag Reduction
Author: Johannes Krzywinski Lunde
Publisher:
Total Pages: 1182
Release: 1966
Genre: Frictional resistance (Hydrodynamics)
ISBN:

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Handbook of Marine Craft Hydrodynamics and Motion Control

Handbook of Marine Craft Hydrodynamics and Motion Control
Author: Thor I. Fossen
Publisher: John Wiley & Sons
Total Pages: 596
Release: 2011-05-23
Genre: Science
ISBN: 1119998689

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The technology of hydrodynamic modeling and marine craft motion control systems has progressed greatly in recent years. This timely survey includes the latest tools for analysis and design of advanced guidance, navigation and control systems and presents new material on underwater vehicles and surface vessels. Each section presents numerous case studies and applications, providing a practical understanding of how model-based motion control systems are designed. Key features include: a three-part structure covering Modeling of Marine Craft; Guidance, Navigation and Control Systems; and Appendices, providing all the supporting theory in a single resource kinematics, kinetics, hydrostatics, seakeeping and maneuvering theory, and simulation models for marine craft and environmental forces guidance systems, sensor fusion and integrated navigation systems, inertial measurement units, Kalman filtering and nonlinear observer design for marine craft state-of-the-art methods for feedback control more advanced methods using nonlinear theory, enabling the user to compare linear design techniques before a final implementation is made. linear and nonlinear stability theory, and numerical methods companion website that hosts links to lecture notes and download information for the Marine Systems Simulator (MSS) which is an open source Matlab/Simulink® toolbox for marine systems. The MSS toolbox includes hydrodynamic models and motion control systems for ships, underwater vehicles and floating structures With an appropriate balance between mathematical theory and practical applications, academic and industrial researchers working in marine and control engineering aspects of manned and unmanned maritime vehicles will benefit from this comprehensive handbook. It is also suitable for final year undergraduates and postgraduates, lecturers, development officers, and practitioners in the areas of rigid-body modeling, hydrodynamics, simulation of marine craft, control and estimation theory, decision-support systems and sensor fusion. www.wiley.com/go/fossen_marine


Wave Energy Potential, Behavior and Extraction

Wave Energy Potential, Behavior and Extraction
Author: Hua Li
Publisher: MDPI
Total Pages: 238
Release: 2020-03-27
Genre: Technology & Engineering
ISBN: 3039283960

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Wave energy has a higher potential than most of the available ocean energy resources; however, it fluctuates dramatically depending on geographical and temporal baselines. The complexity of wave energy is only exacerbated by that fact that the cycle of creation, transport, and disappearance of wave energy is influenced by a wide variety of factors. This Special Issue of Energies explores the latest developments in wave energy potential, behavior, and extraction. This Special Issue introduces 1) thorough reviews on the status of wave energy development, 2) novel technologies to extract wave energy including wave energy converter design, and 3) latest methodologies applied in analyzing wave energy potentials.


Maritime Engineering and Technology

Maritime Engineering and Technology
Author: Carlos Guedes Soares
Publisher: CRC Press
Total Pages: 698
Release: 2012-11-26
Genre: Technology & Engineering
ISBN: 0203105184

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Maritime Engineering and Technology includes the papers from the 1st International Conference on Maritime Technology and Engineering (MARTECH 2011, Lisbon, Portugal, 10-12 May 2011). MARTECH 2011 was held to commemorate 100 years of the Instituto Superior Tico (IST) in Lisbon, and the contributions in the present volume reflect the


Advances in Berthing and Mooring of Ships and Offshore Structures

Advances in Berthing and Mooring of Ships and Offshore Structures
Author: E. Bratteland
Publisher: Springer Science & Business Media
Total Pages: 511
Release: 2012-12-06
Genre: Technology & Engineering
ISBN: 9400914075

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Two previous NATO Advanced Study Institutes (ASI) on berthing and mooring of ships have been held; the first in Lisboa, Portugal in 1965, and the second at Wallingford, England in 1973. These ASls have contributed significantly to the under standing and development of fenders and mooring, as have works by Oil Companies International Marine Forum (1978) and PIANC (1984). Developments in ship sizes and building of new specialized terminals at very exposed locations have necessitated further advances in the combined mooring and fendering technology. Exploration and exploitation of the continental shelves have also brought about new and challenging problems, developments and solutions. Offshore activities and developments have in fluenced and improved knowledge about both ships and other floating structures which are berthed and/or moored under various environmental conditions. The scope of this ASI was to present recent advances in berth ing and mooring of ships and mooring of floating offshore structures, focusing on models and tools available with a view towards safety and reduction of frequencies and consequences of accidents.