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- Book Chapter:
Penalba et al.
Nonlinear effects are demonstrated to be relevant for different aspects on the development of wave energy converters with a particular importance on the assessment of the behaviour and power production capabilities, and design of mooring lines and energy maximising controllers. However, mathematical models that incorporate relevant nonlinear effects beyond the viscous effects are scarce and…
- Book Chapter:
Boccotti
The chapter starts with the flow equations inside a U-oscillating water column. These equations are integrated numerically with the wave pressure β Δp(t) on the outer opening of the plant (Δp(t) is the wave pressure at a vertical breakwater, and β is a factor whose value is obtained with the solution of Chapter 15). The chapter resorts to design sea state and quasi-determinism theory for the…
- Book Chapter:
bin Mat Saad and bin Azman
Oscillating water column (OWC) is one of optional renewable energy device that been used for converting kinetic energy from waves energy into electrical energy. Suitable structural design must be measured and determine to make sure structure is capable to resist wave load. The scope of the research is to design of closed structure of OWC. A model has been set up in Ansys AQWA and Ansys Static…
- Book Chapter:
Falnes and McIver
A linear hydrodynamical theory for a system of oscillating bodies and oscillating water columns (OWCs) is described and illustrated by considering a system of one OWC and one body oscillating in a single mode only. A theoretical relationship between added mass and the energy of the near field motion is generalised to include OWCs. Numerical results are given for a two-dimensional example where…
- Book Chapter:
Chen and Chen
In this paper, using potential flow theory and supposing that the pressure in the air cabin is proportional to the vertical velocity of the water column, we established a hydrodynamic model for OWC wave energy convertors, resulting in a collection of illustration plates. Hence, the behavior of an OWC and the relation between its parameters are discussed. Optimization theory was used to design…
- Book Chapter:
Sarmento and Falcão
A three-dimensional analysis is developed and numerical results are presented concerning the wave-energy absorption by a terminator OWC device consisting of an infinite row of contiguous air-chambers of rectangular Planar form, each chamber being equiped with an independent air-turbine which can be phase-controlled. The water depth is in general finite and the incoming wave is assumed…
- Book Chapter:
Greenhow
This paper extends and exploits a numerical method of calculation of the development of a wave approaching a fixed or moving body. The theory is strictly two-dimensional which implies that the body length is much greater than its breadth or depth, and that it lies parallel to the wave crests. Many wave energy devices of the terminator type, either mounted upon the sea bed or on rigid or…
- Book Chapter:
Masubuchi and Kawatani
This paper presents an adaptive load control strategy for a floating body type wave energy converter. Two nonlinear control laws for large oscillating movement between floating body and connecting link are applied and compared. Good control response assures maximum energy conversion and stable operation for high incident wave height.
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- Book Chapter:
Oltedal
A time-domain mathematical model is presented for a heaving buoy containing an oscillating water column. The model is prepared for numerical computation of the heave motion of the buoy and its power production. The hydrodynamical parameters of the device are converted from an approximation of rigid-body model parameters to applied-pressure model quantities, and they are expressed as kernel…
- Book Chapter:
Hotta et al.
As one of the methods to increase in efficiency of wave energy absorption by the point absorber wave power generator, the phase control was proposed by K.Budal et al.[1]. It is the method to make the float of point absorber oscillate as same as under the condition of resonance in any sea condition. Authors applied this method to the oscillating water column (OWC) type device and investigated…
- Book Chapter:
Jefferys and Whittaker
A linearised model of air compressibility is developed and integrated with the conventional hydrodynamic model of an OWC. This is optimised in the frequency domain and the effects of compressibility are explored. Numerical predictions are validated by experiment. A latching control strategy is described and optimised by first harmonic methods. Simulations show that the approximate frequency…
- Book Chapter:
Hoskin et al.
In this paper we investigate the use of optimal control techniques for improving the efficiency of the power-conversion system in an oscillating water column device. A mathematical model of the system is developed and an optimal control strategy for power-generation is determined. An algorithm is described for solving the problem numerically given the incident wave form. The technique is…
- Book Chapter:
Whittaker and McPeake
This paper presents the results of an experimental test programme and theoretical analysis of the hydrodynamic design of wave powered axi-symmetric navigation buoys. A two degree of freedom system with power extraction damping the relative motion of the two heave modes is considered. Results are presented for a theoretical model which has been verified experimentally.
It is concluded…
- Book Chapter:
Nielsen
Since 1978 utilization of ocean wave power has been investigated at the Department of Ocean Engineering, the Technical University of Denmark. A wave power converter has been developed after the KN principle from an idea to a small prototype with installed turbine and generator of lkW. During 1985 the prototype will be on a sea trial in the Danish sound Øresund to demonstrate, how well both…
- Book Chapter:
Maeda et al.
The purpose of this paper is to establish the optimum design method of a combined system of a primary energy converter with a secondary energy converter of an attenuator OWC (Oscillating Water Column) device as a wave energy extractor which floats in waves, taking account of bottom plate and phase control.
The precise estimation of the characteristics of a primary energy converter…
- Book Chapter:
Bellamy
The SEA Clam Wave Energy Generator has been developed to a prototype design suitable for supplying electricity to island communities and coastal communities. It consists of a 120 m long floating spine supporting six air bags breathing through self-rectifying Wells turbines into a common air duct. An alternative configuration of the SEA Clam has been model tested at Loch Ness and has achieved a…
- Book Chapter:
Malmo and Reitan
This work is a contribution to a research and development activity carried out at the Norwegian Hydrotechnical Laboratory on contract from and in close co-operation with Kværner Brug A/S. Our main contribution to the development of cost-effective wave energy converters has been the introduction of a socalled harbour in front of the absorber which increases the bandwidth. We are also able to…
- Book Chapter:
Evans
A description is given of theories leading to expressions for the mean power which can be extracted by one or more devices absorbing energy from a long-crested monochromatic wave. Extensions to constrained motions and various approximate methods are described and comparisons with more accurate numerical methods or experimental results made.
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- Book Chapter:
Ertekin and Monopolis
We report here upon an exploratory investigation of wave focusing over a bottom step which has a parabolic shape in the horizontal plane. Although building of a large-scale reflector can be a very costly project, the idea of using a parabolic reflector--either in the form of a wall or a step discontinuity at the bottom-- will be presented along with small-scale experimental results to test the…
- Book Chapter:
O'Sullivan et al.
This chapter presents an outline of the requirements for, and the benefits of, short term energy storage at the level of individual wave energy devices, in the field of ocean wave energy conversion. A general background introduction to ocean renewable energy from the perspective of industry growth and incentives, as well as an overview of the different technology types is provided. The unique…
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