The water current power generating device according to the present invention can be used as a power supplying means for supplying electric power to an equipment for in a long-term marine environment observation, in particular, an environmental variation observation in the sea or on the seafloor due to development of marine resources, and an acoustic lighthouse having uses for position measurements and a like of an underwater navigating craft that must perform continuous operation. However, with the water current power generating device (hereinafter, may be referred to as axial flow water wheel power generating device) described in patent reference 1, when a rotary sliding portion is put in sea water, electrolytic corrosion of a metal portion by sea water progresses, and also the sea water leaks from the worn rotary sliding portion, as the rotary sliding portion becomes worn, and as a result, there is a fear that a failure occurs in the axial flow water wheel power generating device.
That is, once the sway vibrating body 1 has varied at a certain deflection angle from the direction of water current, the sway vibration thereof is continued as self-sustained vibration by kinetic energy generated based on inertia force arising from mass and the elastic force arising from tension. DETAILED DESCRIPTION OF THE PREFERRED EXEMPLARY EMBODIMENTS Best modes of carrying out the present invention will be described in further detail using various exemplary embodiments with reference to the accompanying drawings. The water current power generating device (not shown) according to the third embodiment includes an arched shape of a sway vibrating body which bends further in response to a fluid force exerted by a water current, and sways in a bending state, and generates tension in response to a deflection angle from the current direction, and a pair of tension power generating units for converting electromagnetically or piezoelectrically the tension transmitted from the sway vibrating body into electric power.
Dolor Espalda Baja
Moreover, with the fluttering vibration power generating device (wind/water power generating device) described in non-patent reference 1, there is a problem that the above-mentioned multi-articulated flat plate for generating fluttering vibration is complicated in mechanical structure, and it is difficult to keep performance withstanding over long periods of time against a variety of external variations, such as variations of current in direction and in flow rate.
Dolor Sordo Profundo Y Continuo
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. A corresponding end portion of the sway vibrating body (bowstring member) 1 is inserted in the through holes 7 a, 7 b. 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). That is, with the Karman vortex power generating device, there is a disadvantage that an appropriate current velocity range is limited.
For the above reasons, it is not easy to design and manufacture the Karman vortex power generating device for uses in a sea area where current velocity varies with a lapse of time, so that the resonant frequency at the column body constantly matches the occurrence frequency of the Karman vortices varying in response to the current velocity. In addition, with the galloping vibration power generating device described in patent references 4, the flexural vibrating body must convert the galloping vibration generated by the galloping vibration body into the flexural vibration, and transmit the converted flexural vibration to the piezoelectric transducer. However, preferable metals for the bowstring member are not limited to the above materials. 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.
When the deflection angle (angle variation, or sway angle) of the sway vibrating body (bowstring member) 1 is “0” (FIG. 1, includes a sway vibrating body 1 (made up of a bowstring member) which bends in response to a fluid force exerted by a water current, and sways (vibrates in a mode of sway) in a bending state, and generates tension in response to a deflection angle (angle variation, or sway angle) from the current direction, and a piezoelectric type of tension power generating units 2, 2 for converting the tension transmitted from the sway vibrating body 1 into electric power. The sway vibrating body 1 as above-mentioned is made up long lengths of the bowstring member, bends in a downstream direction in response to a fluid force exerted on a circumference surface thereof by a water current, sways in a bending state, and generates tension in response to a deflection angle (angle variation, or sway angle) the direction of water current.
Dolor Neuropático Central
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. Also, the piezoelectric element 5, a power outgoing line and a like making up each tension power generating unit 2 are waterproofed by resin coating, insert molding or a like (not shown) in order to prevent an electric short circuit.
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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. In the Karman vortex power generating device as mentioned above, if a plurality of column bodies is arranged adjacent to each other, the interference of the column bodies occurs and as a result the Karman vortex street is canceled or disturbed. Dolor severo de espalda . Therefore, despite the simple configuration of the sway vibrating body 1, the sway vibration power generating device can be effectively used in a variety of water areas of slow-moving water current to fast-moving water current. Each tension power generating unit 2 includes an annular shape of piezoelectric element 5, on opposite faces of which a pair of electrodes 4 a, 4 b are formed, and a tension transmitting plate 6. The tension transmitting plate 6 is placed in a manner of a laminated structure on the electrode 4 b formed on an outside face of the piezoelectric element 5 and transmitting tension generated in the sway vibrating body 1 to the piezoelectric element 5 therethrough.
Also, high maintainability and durability can be achieved, since the bowstring member is not susceptible to adhesion of marine life, and electric power can be efficiently generated from water current power, without depending upon the direction of water current. 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. 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.
Tipos De Dolor De Cabeza
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. At a time of away motion, the sway vibrating body (bowstring member) 1, both end portions of which each are secured or engaged to the outer face of the tension transmitting plate 6 by using the fixture 8, bends in an arced shape and sways in a tense state in a downstream direction. As materials for the above-mentioned bowstring member making up the sway vibrating body 1, a metal, a synthetic resin material, and a metal/resin composite all may be preferably used, as long as their materials have high tensile strength, flexibility, and is resistant to plastic deformation. Even from this point, according to the sway vibration power generating device of the first embodiment, more stable electric power can be generated from water current power.
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. The sway vibrating body 1, as shown in FIG. FIG. 3 is a group of wave form charts showing a vibration angular variation and a tension variation of the sway vibrating body making up the water current power generating device as shown in FIG. Moreover, the water current power generating device utilizing the fluttering vibration (hereinafter, may be referred to as fluttering vibration power generating device) is disclosed, as a wind/water power generating device, in non-patent reference 1 (M. Yamagishi et al.; “Study on the fluttering characteristics of multi-articulated flat plate in the mean-flow”, Proceedings of the 43rd and 44th JAXA Workshops on “Investigation and Control of Boundary-Layer Transition”; Japan Aerospace Exploration Agency, pp. Second Exemplary Embodiment Next, a second exemplary embodiment of the present invention is described.
However nevertheless, the galloping vibration power generating device described in patent references 4 has disadvantages of increasing in structural complexity and manufacturing cost. Libérese del dolor de espalda . 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. With such configurations of the Karman vortex power generating device, an intricate mechanisms including an axial flow water wheel and a like becomes unnecessary. Moreover, with the fluttering vibration power generating device, there is also a problem that, when a plurality of the fluttering vibration power generating devices is located in close proximity, mutual influence between the fluttering vibration power generating devices cannot be ignored.