Showing papers on "Wave power published in 1988"
Patent•
18 Mar 1988
TL;DR: In this article, the wavelength selective characteristics of wavelength selective elements disposed between a laser chamber and a rear mirror are controlled such that the detected central wavelength falls within a desired allowable range and the detected power becomes minimum or maximum.
Abstract: According to present invention, the central wavelength of the central wave of the output laser beam, and the sideband wave power or central wave power of the output laser beam are detected, and the wavelength selective characteristics of wavelength selective elements disposed between a laser chamber and a rear mirror are controlled such that the detected central wavelength falls within a desired allowable range and that the detected power becomes minimum or maximum.
57 citations
15 Nov 1988-JSME international journal. Series 2, Fluids engineering, heat transfer, power, combustion, thermophysical properties
50 citations
01 Nov 1988
39 citations
DOI•
29 Jan 1988
TL;DR: In this article, the wave power extracting caisson breakwater can convert the wave energy into usable energy and the function and the stability of the caisson as a breakwater are investigated experimentally.
Abstract: The wave power extracting caisson breakwater can convert the wave energy into usable energy. The function and the stability of the caisson as a breakwater are investigated experimentally. It is found that wave reflection and wave transmission of the breakwater are relatively small and that the stability of the breakwater caisson against storm waves is high. The design method of the caisson is proposed considering the impact air pressure in the air chamber.
20 citations
31 Oct 1988
TL;DR: The backward bent duct buoy configuration, developed to solve this problem, is applicable to navigation aids including light buoys and light ships, telemetering buoys, and other utility buoys as discussed by the authors.
Abstract: The application of the wave power electric generator, used in the navigation tail-tube buoy, to other buoy shapes has been restricted because of difficulty in fitting an air chamber. The backward bent duct buoy configuration, developed to solve this problem, is applicable to navigation aids including light buoys and light ships, telemetering buoys, military warning buoys, and other utility buoys. It can also be used for offshore station-keeping buoys, with or without moorings. By upscaling floating wave power generators are created that can supply power to both island and coastal communities. The energy cost of such systems is estimated to be about 38 yen/kWh for islands in the subtropic zone and about 15 yen/kWh in high-wave-power zones. >
9 citations
01 Jan 1988
TL;DR: The major advances in wave energy conversion techniques which have been made internationally since the mid 1970s, when the cost of fossil fuels increased dramatically, are briefly reviewed and an attempt is made to place the developments in perspective as discussed by the authors.
Abstract: The major advances in wave energy conversion techniques which have been made internationally since the mid 1970s, when the cost of fossil fuels increased dramatically, are briefly reviewed and an attempt is made to place the developments in perspective. These range from the complex Salter Duck to the inherently simple oscillating water column systems. In order to give an indication of the challenges which arise in the design of a full size wavepower station more detailed information is provided on the Queen's University device. The importance of a sound understanding of wave hydrodynamics, turbine aerodynamics and the overall matching of the system is emphasised. In addition the total cost of wavepower production is estimated and the relative contributions of the diverse technologies identified. It is concluded that even though wave energy conversion is technically feasible there is great potential for further development. While unit costs are currently higher than for fossil fuel power stations it is considered that wavepower could become an attractive alternative energy source for the UK in the 21st century.
2 citations
Patent•
28 Apr 1988
TL;DR: In this paper, the authors proposed to improve the efficiency of power generation by installing each long-type floating buoy at both sides of a generator case with a built-in generating mechanism, where power generation is carried out by a rock of a weight crank receiving the influence of wave motion, while attached to a wind-direction plate to one side of these floating buoys.
Abstract: PURPOSE:To improve the efficiency of power generation, by installing each long-type floating buoy at both sides of a generator case with a built-in generating mechanism, where power generation is carried out by a rock of a weight crank receiving the influence of wave motion, while attached to a wind-direction plate to one side of these floating buoys. CONSTITUTION:A wave power generating set drives a generating mechanism by rocking motion interlocking with wave motion of the weight crank 6 installed in an almost disclike generator case 2 and provided with a weight 7 at the tip. In the generating set like this, each of long-type floating buoys 3 and 4 are solidly attached to both sides of the generator case 2 in having then paralleled with a reciprocating center line X-Y of the weight crank 6. And, a wind- direction plate 5, extending in a direction orthogonal with this X-Y line is attached to one side (the floating buoy 4) of the buoys. With this constitution, the generator case 2 is made controllable to a sense of its position to rationally receive wave power, thus improvement in the efficiency of power generation is well promoted.
1 citations
Patent•
[...]
03 Nov 1988
TL;DR: A wave power station makes it possible to convert the wave force into electric current as mentioned in this paper, which is a free and environmentally friendly energy generation method for the North Sea of the UK.
Abstract: The water surface of our North Sea is in infinite motion. The formation of the waves is influenced by the tides. A wave power station makes it possible to convert the wave force into electric current. The force of the waves is gigantically large and infinite. The wave power station requires no fuel, and the energy generation is free and environmentally friendly.
1 citations
Patent•
01 Jun 1988
TL;DR: In this paper, a wave energy converter is an absorption pressing circulating system for fluid with a shrinking lumen 8, and which is arranged between floating body 1 and supercharger 10.
Abstract: The relates to a pressurized wave power generating equipment, comprising a floating body 1, a hydraulic generator 18, a beacon 19, a wave energy converter, a supercharger 10, etc. The wave energy converter is an absorption pressing circulating system for fluid with a shrinking lumen 8, and which is arranged between floating body 1 and supercharger 10. The utility model has the advantages of better stability, high wave energy use rate, relative stability energy supply, easy production, and low cost. Besides, the utility model is free from the limit of the direction of incoming wave and has small influence of typhoon. The pressurized wave power generating equipment has no need of complicated air turbine, can provide power supply for floating bodies at sea such as beacon lights, offshore platform, etc., and can provide power supply for inhabitants of an island through the facilities of cable.
1 citations
Patent•
[...]
26 Oct 1988
TL;DR: In this article, a float and a balance weight were provided to improve efficiency of generating power, by providing float and balance weight, which performed a vertical motion in a reverse phase to each other following a wave movement, in a caisson structure, which serves also for a breakwater, and generating the electric power to be induced respectively by plural power generating units in accordance with the vertical motion of these float and balanced weight.
Abstract: PURPOSE:To improve efficiency of generating power, by providing a float and a balance weight, which perform a vertical motion in a reverse phase to each other following a wave movement, in a caisson structure, which serves also for a breakwater, and generating the electric power to be induced respectively by plural power generating units in accordance with the vertical motion of these float and balance weight. CONSTITUTION:If a wave W performs in-out flow motions in a front chamber 14 from an opening part 12 of a caisson structure 10 serving also for a breakwater, a float 18 performs a vertical motion following a movement of the wave W. While a balance weight 20, connected to the float 18 through a connecting rod 26, performs a vertical motion in a reverse phase to the float 18. As the result, each conductor 34b, which is provided being respectively arranged in the first shaft 22 and the second shaft 24 and cutting magnetic flux of each magnetic field generator 34a constituting each power generating unit 34, generates electric power to be respectively induced. That is, the float 18 performs one time vertical motion enabling the two power generating units 34 to simultaneously generate the electric power to be induced. Here the generating unit 34 sets weight in a side of the float 18 larger than the weight in a side of the balance weight 20 thus improving the response characteristic of the float 18 for the movement of the wave.
1 citations
Patent•
22 Sep 1988
TL;DR: In this paper, the authors proposed a method to efficiently perform power generation utilizing wave power by pivotally mounting a surfboard to the upper surface of a float, moored on the surface of the sea, to be lifted by a wave and actuating a pump.
Abstract: PURPOSE:To efficiently perform power generation utilizing wave power, by pivotally mounting a surfboard to the upper surface of a float, moored on the surface of the sea, to be lifted by a wave and actuating a pump thus driving a turbine generator CONSTITUTION:A float 1 is moored on the surface of the sea, further a plurality of surfboards 2 are pivotally mounted to an upper surface of the float 1 tilting to the front for an advance direction of the ground wave A device mounts a pressing spring 3 to be interposed between the float 1 and the surfboard 2 further additionally provides both side plates 2a and a wave receiving plate 2b in the surfboard 2 While the device sets a pump 5 to an upper surface of the float 1 through a mounting bed 4 further fixes a piston rod 5a of the pump 5 to the wave receiving plate 2b actuating the pump 5 by swiveling the wave receiving plate 2b Further a primary tank 6, which introduces through a pipe 7 a pressure medium forced to be press fed from the pump 5, is set up onto the mounting bed 4 And power generation is performed by supplying the pressure medium in the primary tank 6 to a waterproof turbine generator 8