Topic
Wave power
About: Wave power is a research topic. Over the lifetime, 2671 publications have been published within this topic receiving 41439 citations. The topic is also known as: wind wave energy & sea wave energy.
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TL;DR: In this paper, the authors proposed a wave power generator which can convert wave energy to electric energy with high efficiency and supply electric power of a large capacity at low cost and has a simple structure and is low in construction cost.
Abstract: An object is to provide a wave power generator which can convert wave energy to electric energy with high efficiency and supply electric power of a large capacity at low cost and has a simple structure and is low in construction cost. The wave power generator includes a heavy body 3 elastically supported by air springs 4 as elastic members in an enclosing wall 2 on a floating body 1 and an electromagnetic damper as a generating means 7 provided between the heavy body 3 and the floating body 1 . The spring constant of the air springs 4 is adjustable by providing auxiliary tanks in the piston 6 and the floating body 1 so that the undamped natural frequency of the air spring is equal to or close to the frequency of waves within a predetermined frequency ratio ω/ω 0 . Thus, the frequency of the spring system resonates with the frequency of waves, so that the relative movement of the power generating means 7 increases to a maximum and power generation is carried out with maximum efficiency.
48 citations
TL;DR: In this paper, the authors examined theoretically power extraction by a compact array of small buoys, that do not resonate but possess many degrees of freedom, and showed that such systems have certain advantages over a single large buoy.
Abstract: Wave energy converters are usually designed to achieve maximum efficiency by impedance matching with the incoming waves One of the simplest design is a buoy attached to an energy absorber (power-takeoff devise) For maximum efficiency, the buoy must be large enough in order to resonate at the peak frequency of the incident sea, and the extraction rate is the same as the rate of radiation damping With one or few degrees of freedom the resonance peak(s) is(are) usually band-limited The latter feature is common to all wave-power absorbers based on impedance matching Inspired by the FO3 system being developed in Norway by Fred Olsen and ABB Associates, and the Manchester Bobber from UK, the authors examine theoretically power extraction by a compact array of small buoys, that do not resonate but possess many degrees of freedom It is shown that such systems have certain advantages over a single large buoy
48 citations
TL;DR: The hydrodynamic principles common to many wave power converters are reviewed via two representative systems and a simple theory is given for a two-dimensional array of small buoys in well-separated rows parallel to a coast.
Abstract: The hydrodynamic principles common to many wave power converters are reviewed via two representative systems The first involves one or more floating bodies, and the second water oscillating in a fixed enclosure It is shown that the prevailing basis is impedance matching and resonance, for which the typical analysis can be illustrated for a single buoy and for an oscillating water column We then examine the mechanics of a more recent design involving a compact array of small buoys that are not resonated Its theoretical potential is compared with that of a large buoy of equal volume A simple theory is also given for a two-dimensional array of small buoys in well-separated rows parallel to a coast The effects of coastline on a land-based oscillating water column are examined analytically Possible benefits of moderate to large column sizes are explored Strategies for broadening the frequency bandwidth of high efficiency by controlling the power-takeoff system are discussed
48 citations
TL;DR: In this article, the theoretical analysis of an alternative oscillating water column type wave energy converter is presented, where the problem geometry differs from earlier two dimensional studies by a modification on the front wall where the surface piercing barrier is replaced with a fully submerged barrier with a gap.
48 citations
TL;DR: In this article, a two-heaving body model (sparbuoy and OWC) based on linear forces is formulated in the frequency domain, where the presence of the channel side walls is simulated approximately by a periodic array of devices, and alternatively by two finite-length walls.
48 citations