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Second Exemplary Embodiment Next, a second exemplary embodiment of the present invention is described. Next, the water current power generating device utilizing the galloping vibration (hereinafter, may be referred to as galloping vibration power generating device) is disclosed in patent reference 4 (JP Patent Application Publication No. A sway vibrating body (bowstring member) (not shown) of the second embodiment is different from a circular, ellipsoid, or polygonal cross-sectional shape of the sway vibrating body (bowstring member) 1 described in the first embodiment in that the sway vibrating body of the second embodiment is made up of a tension generating member having a form of tape, ribbon, spatula, or a like (hereinafter, may be simply referred to as a tape shape of tension generating member). When the deflection angle (angle variation, or sway angle) of the sway vibrating body (bowstring member) 1 is “0” (FIG. 2, the sway vibrating body 1 bends in a downstream direction in response to a fluid force F exerted on a circumference surface thereof by a water current, sways in a bending state, and generates tension within a maximum deflection angle (maximum variation) from the direction of water current.

1 bends in response to a fluid force exerted on a circumference surface thereof by a water current, and sways in a bending state within a maximum deflection angle “α” (maximum variation) from the direction of water current. With the above configurations, while a period of self-sustained sway vibration is determined by a fluid force and structural parameters of the sway vibrating body, such a sway motion can be caused over a wide range of current velocity, and therefore, ever stable electric power can be generated from water current power in a variety of water areas of slow-moving water current to fast-moving water current. The sway variation moving around from side to side is generated even in slow-moving water current, since the sway vibrating body 1 has low rigidity.

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Furthermore, there is a problem that the Karman vortex power generating device also is not suitable for uses in a tidal current or an ocean current shifting direction at frequent intervals, since power generating efficiency varies and reduces depending upon the direction of water current, as in the case with the axial flow water wheel power generating device. In the present embodiment, the water current includes not only a tidal current and an ocean current, but also a stream of a river. The velocity and direction of tidal current generally vary with a lapse of time in a shallow sea area. The bowstring member described in the first embodiment is in particular suitable for uses in a tidal current or an ocean current that shifts direction at frequent intervals, whereas the tape shape of tension generating member used in the second embodiment is in particular suitable for uses in a tidal current or an ocean current that does not shift direction at frequent intervals.

In addition, the bowstring member is not limited to a cord of solid wire and may be a twisted code, such as a rope, made of a plurality of element wires twisted together, since the bowstring member is not susceptible to adhesion of marine life. The multi-articulated flat plate is made up of a plurality of flat plates and a plurality of connecting shafts jointing the plurality of flat plates.

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1, includes the sway vibrating body 1 made up of the bowstring member as mentioned above, a pair of disk-shaped tension power generating units 2, 2 placed at both end portions of the sway vibrating body 1, and a plurality of supporting columns 3, 3,. If the tape shape of tension generating member is formed to have further an arched cross-sectional shape, since still greater amplitude of vibration and still greater tension variation can be achieved, and therefore electric power can be generated from water current power with a still higher degree of efficiency. 1 and an output voltage from a tension generating unit making up the water current power generating device as shown in FIG.

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Thus, the sway vibrating body (bowstring member) 1 is placed between the opposed tension power generating units 2, 2 (piezoelectric elements 5, 5) in a manner to be able to sway in a bending and tensioned state, when put in a water current. Moreover, a stainless steel and a titanium material which each are excellent in corrosion resistance, and a steel material such as a piano wire which suffers little change in elongation may be used as preferable metals for the bowstring member. Next, each part making up the sway vibration power generating device is described. Dolor atrás de la rodilla . The maximum tension generated in the sway vibrating body 1 acts as maximum pressure on the piezoelectric elements 5, 5 through the tension transmitting plate 6, 6, whereby output voltage from each tension power generating unit 2, 2 also reaches its maximum ((c) in FIG.

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1) through the tension transmitting plate 6. As a result of this, the piezoelectric element 5 converts fluctuating pressure into electric power in response to a compressive stress. The galloping vibration power generating device described in patent references 4 is made up of a galloping vibration body having a front plane which receives a fluid flow, and generating a galloping vibration perpendicular to a direction of fluid flow, a flexural vibrating body generating a flexural vibration based on the galloping vibration transmitted from the galloping vibration body, and a piezoelectric transducer converting flexural vibration energy into electrical energy. However, instead of the case, the tension power generating unit may be made up of a magnetic material mounted in at least one end portion of a sway vibrating body, and a coil surrounding the magnetic material, whereby tension variation is converted into displacement variation and electric power is electro-magnetically generated. On the other hand, With respect to the mechanical vibration of the column body, its resonance frequency is determined by material constants such as a weight of the column body, a diameter and length of the column body, the elastic modulus of a supporting body for supporting the column body, and a like.

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With respect to the Karman vortices, its occurrence frequency is uniquely determined by fluid properties, such as a density and viscosity of fluid, a current velocity, and a diameter of the column body. However, there are following problems with the Karman vortex power generating device disclosed in patent references 2 and 3. That is, for the Karman vortex power generating device to increase efficiency of power generation by achieving an efficient mechanical vibration, a resonant frequency of a column body must be adjust to match an occurrence frequency of the Karman vortices. That is, with the Karman vortex power generating device, there is a disadvantage that an appropriate current velocity range is limited. As water current power generating devices for eliminating the above-mentioned disadvantages of the axial flow water wheel cower generating device, there are provided a water current power generating device utilizing a Karman vortex street, a water current power generating device utilizing a galloping vibration, a water current power generating device utilizing a fluttering vibration, and a like.

In order to solve the above problem, the galloping vibration power generating device described in patent references 4 further includes a direction determination plate (weathercock plate) capable of moving around in response to variations in direction of fluid flow, so that the front plane of the galloping vibration body constantly faces directly the fluid flow, even if the direction of fluid flow varies. The present invention relates to a water current power generating device capable of generating electric power from water current power, and more particularly to the water current power generating device for generating electric power, by utilizing a vibration phenomenon in which a bowstring member or a bow-shaped member bends in a downstream direction, generates tension and sways in a bending and tensioned state, when put in a water current. A cross-sectional shape of the bowstring member making up the sway vibrating body 1 is not limited to a circle and may be an ellipse, a polygon, and a like.

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In addition, the column body is made of a metal and a synthetic resin with high rigidity and the resonance frequency of the column body is high and its sharpness of resonance Q becomes very high, since the column body is placed in a manner of both-ends supporting structure, or cantilever structure.

2), the tension “σ” generated in the sway vibrating body 1 reaches its maximum ((b) in FIG.

It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the sprit and scope of the present invention as defined by the claims. However, preferable metals for the bowstring member are not limited to the above materials. In addition, the tape shape of tension generating member may be configured to have a widest part in the central portion, in order to achieve still greater tension. However, a preferable synthetic resin for the bowstring member is not limited to the above. 2), the tension “σ” generated in the sway vibrating body 1 reaches its maximum ((b) in FIG. 2), the tension “σ” generated in the sway vibrating body 1 reaches its minimum ((b) in FIG. When the lateral vibration displacement “β” reaches its maximum (“B” in FIG. Gif dolor de espalda . 4, a lateral vibration displacement “β” which occurs on the column body by the Kaman vortices reaches its maximum (“B” in FIG.

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Curso de Especialización en Neurocirugía y rehabilitación.. 3), that is, when bending of the sway vibrating body 1 in an arced shape relaxed (“B” in FIG. First, mechanical configurations of the present embodiment are described. Also, the arched shape of the sway vibrating body as mentioned above may be made up of a tape shape of tension generating member, the same as described in the first embodiment.